Updated 2010 February 22
COMETS C/2007 A4-A7, C/2007 B4-B6, C/2007 C3-C13 (SOHO)
The "discovery" data for additional near-sun comets found on
SOHO website images are tabulated below (cf. IAUC 8819) -- all
being Kreutz sungrazers except C/2007 A6 and C/2007 C10 (Meyer
group) and C/2007 A7, C/2007 C7, and C/2007 C12 (no known group).
C/2007 A4 and C/2007 A5 were small and stellar in appearance in C3-
coronagraph images; in C2 images, C/2007 A4 was tailless and
slightly diffuse. C/2007 A6 and C/2007 C10 were small and stellar
in appearance, of mag about 7. C/2007 A7 was stellar in appearance,
peaking at mag about 6 but dying out rapidly. C/2007 B6 was
brighter (mag about 5) with a hint of a tail. C/2007 C3 reached
mag about 4 and showed a very short, faint tail. C/2007 C6 reached
mag about 3; it showed a very faint, thin tail about 0.5 deg long
in C2 images. C/2007 C7 peaked at mag 7.5 and faded gradually,
being tiny and stellar in appearance. C/2007 C11 was stellar in
appearance, reaching mag about 6. C/2007 C12 was stellar in
appearance with a hint of a tail; it brightened (reaching mag about
7) then died rapidly. C/2007 C13 was brighter (peaking at mag
about 3.5), showing a short, "headless" tail about 20' long in C2
images. The remaining six objects appeared stellar and very faint
with no tail. 'MU' = M. Uchina.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 A4 Jan. 4.763 19 10.9 -25 19 C3/2 HS 2007-K46
C/2007 A5 9.446 19 31.7 -23 59 C3 HS 2007-K46
C/2007 A6 10.938 19 33.3 -21 21 C2 TH 2007-K53
C/2007 A7 10.314 19 31.0 -23 01 C2 LC 2007-K65
C/2007 B4 18.096 20 13.3 -22 58 C3 HS 2007-K53
C/2007 B5 19.179 20 21.6 -23 05 C3 WX 2007-K53
C/2007 B6 31.113 21 20.2 -20 19 C3/2 HS 2007-K53
C/2007 C3 Feb. 1.138 21 23.8 -20 07 C3/2 MU 2007-K54
C/2007 C4 2.971 21 21.7 -18 14 C3 HS 2007-K54
C/2007 C5 3.679 21 22.5 -17 49 C3 HS 2007-K54
C/2007 C6 5.846 21 44.0 -19 07 C3/2 BZ 2007-K54
C/2007 C7 2.663 21 01.9 -18 33 C2 HS 2007-K65
C/2007 C8 5.821 21 32.4 -17 16 C3 BZ 2007-K65
C/2007 C9 6.779 21 35.0 -16 47 C3 RM 2007-K65
C/2007 C10 7.163 21 26.2 -14 03 C2 HS 2007-K65
C/2007 C11 7.738 21 47.9 -17 17 C3 HS 2007-K66
C/2007 C12 8.404 21 43.2 -17 46 C3 HS 2007-K66
C/2007 C13 14.654 22 22.9 -15 10 C3/2 HS 2007-K66
[IAUC 8844, 2007 June 10]
COMETS C/2006 A8 AND C/2006 Y10-Y17 (SOHO)
Nine additional near-sun comets have been found on 2006 SOHO
website images (cf. IAUC 8844), all being Kreutz sungrazers except
apparently for C/2006 Y12. C/2006 A8 was stellar in appearance and
very faint (mag approximately 7-7.5) with no tail. All of the
remaining objects that were visible in C3 images appeared therein
as small and stellar; all of the remaining objects that were
visible in C2 images appeared therein as tailless and slightly
diffuse, except for C/2006 Y12, which was faint yet more stellar in
appearance and unusually small. In the table below, new finder 'AW'
= A. Watson.
Comet 2006 UT R.A.(2000)Decl. Inst. F MPEC
C/2006 A8 Jan. 10.013 19 36.4 -24 04 C3 BZ 2007-L16
C/2006 Y10 Dec. 23.071 18 11.9 -26 33 C3/2 TH 2007-K45
C/2006 Y11 24.821 18 18.4 -25 34 C3/2 MA 2007-K45
C/2006 Y12 27.814 18 31.4 -24 40 C2 RK 2007-K45
C/2006 Y13 28.154 18 35.4 -25 53 C3/2 WX 2007-K45
C/2006 Y14 28.504 18 34.6 -24 38 C2 RK 2007-K45
C/2006 Y15 29.179 18 39.4 -25 51 C3/2 WX 2007-K46
C/2006 Y16 29.413 18 38.6 -24 44 C2 AW 2007-K46
C/2006 Y17 29.529 18 43.9 -25 44 C3 HS 2007-K46
[IAUC 8845, 2007 June 11]
COMETS C/2007 D4, C/2007 D5, C/2007 E4, C/2007 E5 (SOHO)
Four additional Kreutz-sungrazing comets have been found on
SOHO website images (cf. IAUC 8845) -- the "discovery" data
tabulated below -- all being very faint and stellar in appearance.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 D4 Feb. 16.613 22 19.3 -13 43 C3 HS 2007-K66
C/2007 D5 18.821 22 24.0 -12 36 C3 AK 2007-K68
C/2007 E4 Mar. 2.904 23 09.7 - 7 55 C3 BZ 2007-K66
C/2007 E5 9.721 23 33.8 - 5 10 C3 VB 2007-K68
[IAUC 8846, 2007 June 11]
COMETS C/2007 F2-F5, C/2007 G2, C/2007 H4-H9 (SOHO)
Additional near-sun comets (cf. IAUC 8846) have been found on
SOHO website images -- all being Kreutz sungrazers except for
C/2007 F4 (Meyer group). C/2007 F2 reached mag about 5 in C3
images, and showed a thin, faint, 15' tail in C2 images. C/2007 F3
was stellar in appearance, reaching mag about 6; it was tailless
even in C2 images. C/2007 F4 was stellar in appearance and reached
mag about 6.5. C/2007 H6, C/2007 H8, and C/2007 H9 were fuzzy,
very faint, and tailless. C/2007 H7 was was slightly diffuse,
reaching mag about 7, with a hint of a tail. The remaining four
objects were very small, somewhat diffuse, and quite faint (mag
about 7.5-8).
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 F2 Mar. 20.904 0 29.3 - 1 36 C3/2 BZ 2007-K68
C/2007 F3 27.446 0 40.2 + 0 46 C3/2 BZ 2007-K68
C/2007 F4 28.488 0 32.0 + 4 45 C3/2 BZ 2007-K69
C/2007 F5 30.118 0 42.0 + 3 08 C2 TH 2007-K69
C/2007 G2 Apr. 8.018 1 14.4 + 6 19 C2 TH 2007-K69
C/2007 H4 18.963 1 53.4 +10 03 C2 BZ 2007-K69
C/2007 H5 20.743 1 59.9 +10 36 C2 RK 2007-K69
C/2007 H6 21.868 2 04.5 +11 04 C2 VB 2007-L02
C/2007 H7 23.160 2 08.7 +11 18 C2 BZ 2007-L02
C/2007 H8 29.976 2 33.0 +13 26 C2 BZ 2007-L02
C/2007 H9 30.535 2 35.6 +13 32 C2 BZ 2007-L02
[IAUC 8847, 2007 June 12]
COMETS C/2007 J1-J6 (SOHO)
Additional near-sun comets (cf. IAUC 8847) have been found on
SOHO website images -- all being Kreutz sungrazers except for
C/2007 J1 (Meyer group). C/2007 J1 was stellar in appearance and
reached mag about 6. C/2007 J5 was fuzzy, very faint, and tailless.
C/2007 J6 was very diffuse and somewhat elongated, with a hint of a
tail. The remaining three objects were very small, slightly
diffuse, and faint (mag about 7.5-8).
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 J1 May 2.579 2 43.5 +15 29 C3/2 RK 2007-L03
C/2007 J2 3.121 2 44.8 +14 17 C2 BZ 2007-L03
C/2007 J3 4.746 2 54.4 +14 17 C3/2 TH 2007-L03
C/2007 J4 4.771 2 50.9 +14 43 C2 TH 2007-L03
C/2007 J5 7.538 3 01.3 +15 25 C2 BZ 2007-L16
C/2007 J6 9.146 3 06.3 +15 48 C2 BZ 2007-L16
[IAUC 8848, 2007 June 12]
COMETS C/2004 A4, C/2004 B11, AND C/2004 J20 (SOHO)
Three additional near-sun comets (cf. IAUC 8848) have been
found by B. Zhou on archival 2004 SOHO website images -- all being
Kreutz sungrazers except for C/2004 J20 (Kracht group). Each was
stellar in appearance and faint, the two Kreutz sungrazings
reaching mag about 7-7.5 and C/2004 J20 peaking in brightness at
mag about 8.
Comet 2004 UT R.A.(2000)Decl. Inst. F MPEC
C/2004 A4 Jan. 7.929 19 25.6 -25 43 C3 BZ 2007-L16
C/2004 B11 20.864 20 22.6 -21 54 C3 BZ 2007-L16
C/2004 J20 May 13.618 3 27.2 +19 11 C2 BZ 2007-K65
[IAUC 8850, 2007 June 20]
COMETS C/2005 B5 AND C/2005 B6 (SOHO)
Two additional Kreutz sungrazing comets (cf. IAUC 8850) have
been found by B. Zhou on 2005 archival SOHO website images. Each
was stellar in appearance and faint, reaching mag about 7-7.5.
Comet 2005 UT R.A.(2000)Decl. Inst. F MPEC
C/2005 B5 Jan. 22.221 20 33.1 -21 40 C3 BZ 2007-L16
C/2005 B6 30.571 21 06.8 -18 58 C3 BZ 2007-L16
[IAUC 8853, 2007 June 26]
P/2007 R5 = 1999 R1 = 2003 R5 (SOHO)
K. Battams, Naval Research Laboratory, informs us that B. Zhou
reported his detection of a member of the 'Kracht II comet group'
in SOHO-LASCO C2 data on Sept. 10; the object was immediately
confirmed by R. Kracht as showing 'Kracht-II' group motion. Kracht
had in Sept. 2002 (MPEC 2002-S35) and Sept. 2003 (MPEC 2004-J59)
noted the similarity of the motions of 1999 R1 (cf. IAUC 7251) to
the motions of 2002 R5 (IAUC 7984) and 2003 R5 (IAUC 8340), and B.
G. Marsden noted (MPEC 2004-J59) that his orbital elements of 2003
R5 were essentially identical with his elements of 1999 R1 that
were given on MPEC 1999-R19; following these developments a couple
of years later, S. Hoenig (2006, A.Ap. 445, 759) published his
prediction that the presumed single object 1999 R1 = 2003 R5 would
return to perihelion around 2007 Sept. 11.26 UT. All the 'Kracht
II' objects were uncritically called "comets" when announced,
despite their lack of an obvious coma or tail (on the standing
assumption that the SOHO objects must generally be either active or
extinct cometary nuclei); the cometary designation 2007 R5 has been
assigned to these new observations to follow the pattern of earlier
designations, but with mild support also from the photometric
behavior of the object (see also IAUC 8872).
2007 UT R.A. (2000) Decl. Mag.
Sept.10.28755 11 18 09 + 3 52.8 8.8
Battams has now submitted his measurements for C2 and C3
images of 2007 R5 (initial observation tabulated above), as well as
astrometric remeasurements from C2 images (only) for 1999 R1 and
2003 R5. The reduced positions by Marsden appear on MPEC 2007-S16,
together with linked orbital elements by Marsden for C2 data only
from all three apparitions (satisfying 44 observations with mean
residual 9".6), including those given below; the excluded C3
positions have systematic residuals > 1'.
Epoch = 2007 Sept.17.0 TT
T = 2007 Sept.11.3197 TT Peri. = 48.5655
e = 0.978649 Node = 0.0489 2000.0
q = 0.053720 AU Incl. = 12.6400
a = 2.516068 AU n = 0.2469565 P = 3.99 years
[IAUC 8871, 2007 September 18]
P/2007 R5 = 1999 R1 = 2003 R5 (SOHO)
Continuing the remarks on IAUC 8871, regarding the past
uncritical assumption that this object is a comet, the 'Kracht II'
group has no known association with any comet or meteor streams,
nor has there been any obvious tail or coma observed at any of the
apparitions of this much smaller group of objects -- unlike the
cases involving the Marsden and 'Kracht I' groups of SOHO objects,
which have been linked to comet 96P and at least two meteor streams
(e.g., Sekanina and Chodas 2005, Ap.J. Suppl. 161, 551), and the
Kreutz sungrazers. An analysis of the images of 1999 R1, 2003 R5,
and 2007 R5 by M. Knight (University of Maryland) suggests that the
expansion of the C2 images (which have a scale of 11".8/pixel) as
it brightens may be an indication of coma material (the object
remains pointlike in C3 images, with a scale of 56"/pixel), and his
analysis of the light curves for each apparition is suggestive more
of a cometary light curve than an asteroidal light curve (though
asteroidal photometric behavior at such high phase angles and small
solar elongations has not been observed previously); peaks in
brightness occurred a few hours after perihelion each time: near
mag 6 on 1999 Sept. 5.1 and 2003 Sept. 8.4, and near mag 5.5 on
Sept. 11.0 UT (and the magnitude tabulated on IAUC 8871 is from
Knight). The images of 2007 R5 show it fading rapidly and
disappearing around Sept. 12.3 as it made its turn to move toward
superior conjunction with the sun after perihelion. According to K.
Battams, both the 1999 and 2003 objects appeared from behind the C2
occulter and "started pretty much as point sources" (perhaps 2
pixels in diameter): as they crossed the C2 field-of-view, the
objects each "grew in size and brightness at a very steady rate,
but always retaining a well-defined edge (i.e., not diffuse)"; at
the right-hand edge of the C2 field-of-view, the object images
"were probably 4-5 pixels across and 5-6 pixels 'tall' and
generally 'rounded'".
[IAUC 8872, 2007 September 18]
COMETS C/2007 J8-J12 AND C/2007 K7-K18 (SOHO)
Additional near-sun comets (cf. IAUC 8853) have been found on
SOHO website images -- all being Kreutz sungrazers except for
C/2007 K12 (Meyer group). K. Battams reports that C/2007 J8, K7,
K9, and K11 were slightly diffuse and very faint (mag 8) with no
tail. C/2007 J9 was stellar (mag about 6.5) in C3 images, and very
slightly diffuse with a hint of tail in C2 images. C/2007 J10, K13,
K15, and K16 were slightly diffuse and faint (mag about 7.5).
C/2007 J11 was stellar in C3 images, and was of mag about 6.5 with
a hint of tail in C2 images. C/2007 J12 was extremely faint in C3
images and "very faint/diffuse" (mag 8) in C2 images. C/2007 K8
was stellar in appearance in C3 images, and slightly diffuse (mag
about 7) with a hint of tail in C2 images. C/2007 K10 was stellar
in appearance and faint in C3 images, and slightly diffuse and
elongated (mag about 7.5) in C2 images. C/2007 K12 was stellar in
appearance, elongated (but not in the direction of motion), and of
mag about 6.5. C/2007 K14 was extremely faint (mag about 8.5) and
fairly diffuse. C/2007 K17 was very faint (mag about 8), elongated,
and diffuse. C/2007 K18 was faint and stellar in appearance in C3
images, and slightly diffuse (mag about 7) with a hint of tail in
C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 J8 May 12.913 3 20.9 +16 49 C2 BZ 2007-T56
C/2007 J9 13.904 3 28.4 +16 14 C3/2 SY 2007-T56
C/2007 J10 14.135 3 25.7 +17 01 C2 BZ 2007-T56
C/2007 J11 15.433 3 40.0 +15 36 C3/2 BZ 2007-T56
C/2007 J12 15.679 3 38.4 +16 02 C3/2 BZ 2007-T56
C/2007 K7 16.854 3 34.3 +17 31 C2 BZ 2007-T57
C/2007 K8 17.196 3 40.9 +16 47 C3/2 BZ 2007-T57
C/2007 K9 17.646 3 38.5 +17 46 C2 BZ 2007-T57
C/2007 K10 17.779 3 43.4 +16 55 C3/2 BZ 2007-T77
C/2007 K11 18.271 3 41.1 +17 53 C2 BZ 2007-T77
C/2007 K12 18.396 3 41.9 +20 08 C2 HS 2007-T77
C/2007 K13 21.175 3 52.4 +18 30 C2 TH 2007-T77
C/2007 K14 21.183 3 52.5 +18 29 C2 BZ 2007-T78
C/2007 K15 22.200 3 54.8 +18 34 C2 RK 2007-T78
C/2007 K16 22.292 3 55.9 +18 38 C2 HS 2007-T78
C/2007 K17 24.635 4 05.2 +19 07 C2 TH 2007-T78
C/2007 K18 26.263 4 11.9 +19 06 C3/2 MM 2007-T78
[IAUC 8882, 2007 October 19]
COMETS C/2007 K19, C/2007 K20, C/2007 L1-L6 (SOHO)
Further to IAUC 8882, additional Kreutz sungrazing comets have
been found on SOHO website images. C/2007 K19 and L5 were
extremely faint (mag about 8.5) and diffuse, the former being also
elongated. C/2007 K20 and L6 were very faint (mag about 8) and
diffuse. C/2007 L1 was stellar in appearance in C3 images, and
slightly diffuse (mag about 7.5) with no tail in C2 images. C/2007
L2 was stellar in appearance in C3 images, and was of mag about 5.5
with an extremely faint, thin tail in C2 images. C/2007 L3 peaked
at mag about 3 with a dense, wide tail about 45" long on June 8.171
UT; while the comet's "head" disappeared at about June 8.181, the
tail was still visible at June 8.917 (when it had extended into a
diffuse arc of apparent length around 1.5 deg), and this comet was
also visible in coronagraphs on both STEREO spacecraft. C/2007 L4
was stellar in appearance (mag about 8).
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 K19 May 28.326 4 17.0 +19 32 C2 RK 2007-T93
C/2007 K20 31.129 4 29.8 +20 02 C2 TH 2007-T93
C/2007 L1 June 4.305 4 46.4 +20 13 C3/2 BZ 2007-T94
C/2007 L2 4.971 4 52.1 +18 39 C3/2 KB 2007-T94
C/2007 L3 6.388 4 56.3 +18 10 C3/2 SY 2007-T94
C/2007 L4 7.704 4 59.0 +20 53 C2 BZ 2007-T94
C/2007 L5 9.371 5 03.7 +20 56 C2 AW 2007-T94
C/2007 L6 10.621 5 08.4 +21 06 C2 BZ 2007-T117
[IAUC 8883, 2007 October 20]
COMETS C/2007 L7-L11 (SOHO)
Further to IAUC 8883, additional Kreutz sungrazing comets have
been found on SOHO website images ("discovery" observations
tabulated below). C/2007 L7 was small, slightly diffuse, and very
faint (mag about 8). C/2007 L8 and C/2007 L9 were very diffuse
(mag about 7.5), the former having no tail, and the latter being
elongated. C/2007 L10 was very faint and stellar in appearance in
C3 images, and slightly diffuse (mag about 7.5) with a hint of tail
in C2 images. C/2007 L11 was stellar in appearance (mag about 6.5)
in C3 images, and very diffuse with a short tail in C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 L7 June 10.663 5 09.7 +21 06 C2 BZ 2007-T117
C/2007 L8 10.688 5 08.7 +21 03 C2 BZ 2007-T117
C/2007 L9 10.996 5 10.0 +21 02 C2 BZ 2007-T117
C/2007 L10 13.321 5 20.9 +20 12 C3/2 BZ 2007-T122
C/2007 L11 14.821 5 27.1 +20 18 C3/2 TH 2007-T122
[IAUC 8888, 2007 November 1]
COMETS C/2007 L12, C/2007 L13, AND C/2007 M4 (SOHO)
Further to IAUC 8888, additional Kreutz sungrazing comets have
been found on SOHO website images ("discovery" observations
tabulated below). C/2007 L12 was extremely faint (mag about 8.5-
9.0). C/2007 L13 and C/2007 M4 were stellar (mag about 5.5) in C3
images. C/2007 L13 appeared slightly diffuse with a very faint
tail in C2 images. C/2007 M4 was slightly diffuse and showed a
short, thin, faint tail in C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 L12 June 14.854 5 25.8 +21 22 C2 RM 2007-T122
C/2007 L13 15.138 5 26.2 +19 58 C3/2 AK 2007-T122
C/2007 M4 24.696 6 01.0 +19 16 C3/2 TH 2007-U15
[IAUC 8889, 2007 November 2]
COMETS C/2007 M5-M9 (SOHO)
Further to IAUC 8889, additional near-sun comets have been
found on SOHO website images -- C/2007 M5 and C/2007 M8 being non-
group, and the rest being Kreutz sungrazers. C/2007 M5, which has
the smallest perihelion distance on record (q = 0.0011 AU), entered
the C2 field-of-view at peak brightness (mag about 6.5) and faded
rapidly, disappearing from view before it reached the occulting
disk. C/2007 M6 was stellar in appearance (mag about 7) in C3
images, but diffuse with no tail in C2 images. C/2007 M7 and
C/2007 M9 were faint (mag about 8) and diffuse. C/2007 M8 was very
small, circular (nearly stellar in appearance), and faint (mag
about 7.5-8), appearing to be marginally diffuse.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 M5 June 25.229 6 06.0 +22 37 C2 BZ 2007-U15
C/2007 M6 25.346 6 05.4 +21 38 C3/2 BZ 2007-U15
C/2007 M7 25.413 6 07.9 +21 39 C2 BZ 2007-U16
C/2007 M8 25.564 6 17.8 +22 32 C2 HS 2007-U16
C/2007 M9 27.604 6 16.5 +21 44 C2 BZ 2007-U16
[IAUC 8890, 2007 November 6]
COMETS C/2007 K21 AND C/2007 M10 (SOHO)
Additional Kreutz-sungrazing comets (cf. IAUC 8890) -- both of
mag about 7 and stellar, though C/2007 M10 appeared diffuse in C2
images:
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 K21 May 23.358 3 59.9 +18 50 C2 KB 2007-U23
C/2007 M10 June 29.846 6 23.8 +20 53 C3/2 BZ 2007-U16
[IAUC 8891, 2007 November 6]
COMETS C/2007 N4-N8, C/2007 O3-O4, C/2007 Q4-Q7 (SOHO)
Further to IAUC 8891, additional Kreutz-sungrazing comets have
been found on SOHO website images, their "discovery" observations
tabulated below. All eleven objects were stellar in appearance in
C3 images. C/2007 N4, of mag 5.5 in C3 images, was slightly
diffuse with no tail in C2 images. C/2007 N5, C/2007 N7, C/2007 Q4,
C/2007 Q5, and C/2007 Q7 were of mag about 6 in C3 images; C2
images showed C/2007 N5 to be quite diffuse with a hint of faint
tail, and C/2007 N7 to be slightly diffuse with a very faint short
tail. C/2007 N6, C/2007 N8, and C/2007 O4 were faint (mag about 7)
in C3 images; however, C/2007 N6 appeared diffuse with no tail in
C2 images. C/2007 O3 was tiny and very faint (mag 7.5). C/2007 Q6
was very small and of mag about 6.5. C/2007 Q7 was possibly
slightly elongated.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 N4 July 3.613 6 37.2 +19 41 C3/2 HS 2007-U23
C/2007 N5 7.904 6 52.8 +19 38 C3/2 BZ 2007-U23
C/2007 N6 11.638 7 09.2 +20 06 C3/2 BZ 2007-U23
C/2007 N7 13.179 7 11.2 +18 40 C3/2 KB 2007-U24
C/2007 N8 13.346 7 14.6 +19 35 C3 BZ 2007-U24
C/2007 O3 18.529 7 35.4 +19 43 C3 HS 2007-U24
C/2007 O4 27.221 8 05.9 +17 05 C3 BZ 2007-U24
C/2007 Q4 Aug. 17.238 9 22.4 +12 01 C3 SY 2007-U34
C/2007 Q5 17.263 9 22.8 +12 22 C3 AK 2007-U34
C/2007 Q6 17.529 9 28.1 +12 18 C3 HS 2007-U34
C/2007 Q7 25.096 9 50.2 + 9 37 C3 HS 2007-U34
[IAUC 8892, 2007 November 7]
COMETS C/2004 E5 (SOHO)
Further to IAUC 8892, another slightly diffuse Kreutz-
sungrazing comet of mag about 7.5 has been found on archival SOHO
website images.
Comet 2004 UT R.A.(2000)Decl. Inst. F MPEC
C/2004 E5 Mar. 1.321 23 03.3 - 8 08 C3 BZ 2007-U23
[IAUC 8893, 2007 November 9]
COMETS C/2007 Q8, C/2007 Q9, AND C/2007 R6-R8 (SOHO)
Further to IAUC 8893, additional Kreutz-sungrazing comets have
been found on SOHO website images, their "discovery" observations
tabulated below. C/2007 Q8, also found by R. Kracht, was bright
(mag about 4.5) and elongated. C/2007 Q9, which was also clearly
visible in SECHHI HI-1B images for several hours, was also quite
bright (mag about 5.5) and slightly elongated. C/2007 R6 was very
faint (mag about 8) and slightly diffuse. C/2007 R7 and C/2007 R8
were stellar in appearance and faint (mag about 7) in C3 images;
C/2007 R7 appeared small, diffuse, and very faint in C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 Q8 Aug. 28.596 10 05.2 + 8 30 C3 HS 2007-U35
C/2007 Q9 28.988 10 07.2 + 8 26 C3 JS 2007-U35
C/2007 R6 Sept. 1.075 10 31.5 + 8 00 C2 HS 2007-U35
C/2007 R7 8.321 10 52.2 + 4 09 C3/2 HS 2007-U35
C/2007 R8 9.863 10 53.8 + 4 32 C3 BZ 2007-U36
[IAUC 8895, 2007 November 14]
COMETS C/2007 R9, C/2007 R10, C/2007 S3, C/2007 S4 (SOHO)
Further to IAUC 8895, additional near-sun comets have been
found on SOHO website images, with their "discovery" observations
tabulated below; all were Kreutz sungrazers except for C/2007 R10
(Meyer group). C/2007 R9 and C/2007 S3 were tiny and stellar in
appearance (mag about 7). C/2007 R10 was also stellar in
appearance, very small, and faint (mag about 7.5). C/2007 S4
appeared quite diffuse and very faint (mag about 7) in C3 images,
and extremely faint and diffuse in C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 R9 Sept. 13.446 11 07.8 + 3 02 C3 BZ 2007-U36
C/2007 R10 14.938 11 25.8 + 5 13 C2 AK 2007-U36
C/2007 S3 16.113 11 17.8 + 1 59 C3 BZ 2007-U36
C/2007 S4 23.763 11 47.7 - 1 38 C3/2 MU 2007-U36
[IAUC 8896, 2007 November 15]
COMETS C/2007 S5-S10 AND C/2007 T7-T11 (SOHO)
Further to IAUC 8896, additional Kreutz-sungrazing comets have
been found on SOHO website images, as tabulated below. C/2007 S5
was bright (mag 4) and teardrop-shaped in C3-coronagraph images; C2
images showed a long (0.75-deg), thin tail. C/2007 S6, C/2007 S8,
C/2007 S9, and C/2007 T8 were described by K. Battams as tiny and
stellar in appearance (mag about 7, except mag 7.5 for C/2007 S8)
in C3 images; C2 images showed C/2007 S6 and C/2007 S8 to be very
faint and diffuse, while C/2007 S9 was "fuzzy" and faint, and
C/2007 T8 was diffuse. C/2007 S7 appeared very diffuse and faint
(mag 8). C/2007 S10 and C/2007 T7 were also small and stellar in
appearance (mag about 6) in C3 images, with the former being
diffuse and the latter a bit diffuse with a hint of tail in C2
images. C/2007 T9 (also found by R. Matson and T. Hoffman) was
small and stellar in appearance (mag 6.5) in C3 images, and diffuse
with a hint of tail in C2 images. C/2007 T10 was stellar in
appearance (mag 7) in C3 images, and diffuse in C2 images. C/2007
T11 was very faint (mag about 8) and diffuse.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 S5 Sep. 26.654 11 41.2 - 2 48 C3/2 RM 2008-A40
C/2007 S6 28.263 12 04.0 - 2 39 C3/2 HS 2008-A40
C/2007 S7 28.704 12 11.4 - 2 44 C2 HS 2008-A40
C/2007 S8 29.263 12 05.4 - 3 11 C3/2 HS 2008-A40
C/2007 S9 29.471 12 06.0 - 3 25 C3/2 HS 2008-A40
C/2007 S10 30.013 12 02.8 - 3 57 C3/2 BZ 2008-A40
C/2007 T7 Oct. 4.696 12 22.7 - 5 44 C3/2 RM 2008-A41
C/2007 T8 10.471 12 45.1 - 7 58 C3/2 RM 2008-A41
C/2007 T9 10.821 12 44.5 - 8 19 C3/2 BZ 2008-A41
C/2007 T10 11.071 12 51.0 - 8 01 C3/2 HS 2008-A50
C/2007 T11 13.456 13 05.7 - 8 36 C2 HS 2008-A50
[IAUC 8910, 2008 January 15]
COMETS C/2007 T12-T14, C/2007 U3, C/2007 U4 (SOHO)
Further to IAUC 8910, additional Kreutz-sungrazing comets have
been found on SOHO website images, as tabulated below. C/2007 T12
was small and diffuse (mag 7.5). C/2007 T13 was extremely faint
(mag about 8) and diffuse. C/2007 T14 was extremely faint (mag
about 7.5) and tiny in C3-coronagraph images, and stellar in
appearance (mag 7.5) in C2 images. C/2007 U3 was stellar in
appearance (mag about 6) in C3 images, and fairly condensed with a
hint of a thin, faint tail in C2 images. C/2007 U4 was diffuse and
elongated (mag 7.5).
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 T12 Oct. 13.579 13 06.4 - 8 43 C2 AK 2008-A50
C/2007 T13 15.329 13 12.4 - 9 11 C2 HS 2008-A50
C/2007 T14 15.471 13 14.9 - 9 55 C3/2 HS 2008-A50
C/2007 U3 24.113 13 37.3 -13 35 C3/2 HS 2008-A51
C/2007 U4 24.146 13 46.9 -12 39 C2 HS 2008-A51
[IAUC 8912, 2008 January 19]
COMETS C/2007 U5 AND C/2007 U6 (SOHO)
Further to IAUC 8912, additional Kreutz-sungrazing comets have
been found on SOHO website images, as tabulated below. C/2007 U5
appeared stellar (mag about 7.5) in C3 images, and was slightly
diffuse with no tail in C2 images. C/2007 U6 was very faint (mag
about 8) and quite diffuse.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 U5 Oct. 24.488 13 45.8 -13 04 C3/2 MU 2008-A51
C/2007 U6 24.729 13 49.2 -12 55 C2 AK 2008-A51
[IAUC 8914, 2008 February 1]
COMETS C/2007 S11, C/2007 U7-U13, C/2007 V3-V10 (SOHO)
Further to IAUC 8914, additional near-sun comets have been
found on SOHO website images, as tabulated below; all were Kreutz
sungrazers except for C/2007 S11 (no known group affiliation) and
the Meyer-group objects C/2007 U7 and C/2007 V10. C/2007 S11 was
tiny, stellar in appearance, and very faint (mag 7.5-8). C/2007 U7,
C/2007 U11, C/2007 V5, and C/2007 V10 were also tiny, stellar in
appearance, and faint (mag about 7.5); C/2007 V8 was described
similarly by K. Battams (but with mag about 8). C/2007 V3 was very
diffuse and elongated (mag about 7.5). C/2007 V6 was very faint
(mag about 8), very diffuse, and elongated. C/2007 V7 was
extremely faint (mag about 8.5) and very diffuse. The other seven
objects all appeared stellar in C3 images (C/2007 U8 was of mag
about 6.5, C/2007 U9 was of mag about 7.5, C/2007 U10 was of mag
about 7, C/2007 U12 was of mag about 6, C/2007 U13 and C/2007 V9
were of mag about 6.5, and C/2007 V4 was of mag about 5.5); in C2
images, C/2007 U8 was elongated and somewhat diffuse, C/2007 V4 had
a faint thin tail about 23' long at 5.8 solar radii on Nov. 3.560
UT, and C/2007 V9 was mostly stellar in appearance with a hint of a
short faint tail -- while the remaining four comets were slightly
diffuse (C/2007 U9 being described as faint, and the other three
objects showing a hint of a faint tail). New finder code: ZJ = Z.
Jin (cf. IAUC 8365).
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 S11 Sep. 28.604 12 19.9 - 0 14 C2 RK 2008-A71
C/2007 U7 Oct. 27.226 14 02.1 -11 09 C2 HS 2008-A71
C/2007 U8 27.638 13 53.3 -14 36 C3/2 HS 2008-A71
C/2007 U9 28.154 13 59.9 -14 31 C3/2 HS 2008-A71
C/2007 U10 28.679 13 59.6 -14 53 C3/2 HS 2008-A72
C/2007 U11 29.061 14 06.5 -14 28 C2 HS 2008-A72
C/2007 U12 30.179 14 00.6 -15 53 C3/2 TH 2008-A72
C/2007 U13 30.763 14 04.9 -15 59 C3/2 MU 2008-A72
C/2007 V3 Nov. 1.546 14 19.9 -15 38 C2 RM 2008-A75
C/2007 V4 2.471 14 07.1 -17 57 C3/2 AK 2008-A75
C/2007 V5 3.576 14 28.5 -16 20 C2 RK 2008-A75
C/2007 V6 4.643 14 33.4 -16 46 C2 HS 2008-A75
C/2007 V7 5.671 14 37.1 -17 02 C2 RK 2008-A76
C/2007 V8 6.143 14 39.6 -17 16 C2 HS 2008-A76
C/2007 V9 6.196 14 23.8 -19 00 C3/2 RM 2008-A76
C/2007 V10 9.338 14 53.1 -15 31 C2 ZJ 2008-A76
[IAUC 8918, 2008 February 7]
COMETS C/2007 V11-V14, C/2007 W4-W12, C/2007 X1-X4 (SOHO)
Further to IAUC 8918, additional near-sun comets have been
found on SOHO website images, as tabulated below; all were Kreutz
sungrazers except for C/2007 X1 (no known group affiliation).
C/2007 V11 was bright (mag 4) with a short tail in C3 images; in C2
images, it also showed a short, faint tail. C/2007 V12 was diffuse
with a hint of faint tail (mag about 7). C/2007 V13 and C/2007 X2
were extremely faint (mag about 8.5) and diffuse. C/2007 V14 was
tiny and stellar in appearance (mag about 7.5). C/2007 W4 and
C/2007 X1 were small and stellar in appearance (mag about 6.5).
C/2007 W5 was tiny, very faint (mag about 8), and slightly diffuse.
C/2007 W6 was tiny, very faint (mag about 7.5), and quite diffuse.
C/2007 W7 was stellar in appearance (mag 6.5) in C3 images, and it
appeared as a bright 'teardrop' in C2 images. C/2007 W8 was faint
(mag 7.5) and very diffuse. C/2007 W9 was very small and diffuse
(mag 8). C/2007 W10 was very diffuse and elongated (mag 7.5).
C/2007 W11 and W12 were small and somewhat diffuse (mag 7). C/2007
X3 was tiny, faint (mag 7.5), and slightly diffuse. C/2007 X4 was
stellar in appearance (mag about 5.5) in C3 images, and quite
condensed and teardrop-shaped in C2 images. New finder code: MK =
M. Kusiak.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 V11 Nov. 10.596 14 38.9 -21 10 C3/2 HS 2008-B09
C/2007 V12 11.118 14 59.6 -18 41 C2 SY 2008-B09
C/2007 V13 13.435 15 09.3 -19 26 C2 RK 2008-B09
C/2007 V14 14.643 15 14.5 -19 44 C2 RK 2008-B09
C/2007 W4 19.113 15 27.2 -22 21 C3 MA 2008-B10
C/2007 W5 19.310 15 34.0 -20 57 C2 HS 2008-B10
C/2007 W6 22.758 15 49.2 -21 48 C2 RK 2008-B10
C/2007 W7 23.154 15 42.3 -24 10 C3/2 BZ 2008-B10
C/2007 W8 23.692 15 53.5 -22 03 C2 HS 2008-B10
C/2007 W9 23.217 15 54.3 -22 09 C2 TH 2008-B35
C/2007 W10 24.125 15 55.9 -22 11 C2 MK 2008-B35
C/2007 W11 29.354 16 20.2 -23 20 C2 RK 2008-B35
C/2007 W12 30.829 16 27.0 -23 34 C2 HS 2008-B35
C/2007 X1 Dec. 3.064 16 29.0 -21 01 C2 MU 2008-B36
C/2007 X2 4.713 16 44.9 -24 07 C2 HS 2008-B36
C/2007 X3 4.814 16 44.2 -24 07 C2 RK 2008-B36
C/2007 X4 5.388 16 41.8 -26 35 C3/2 HS 2008-B36
[IAUC 8919, 2008 February 7]
COMETS C/2007 X5-X15 (SOHO)
Further to IAUC 8919, additional near-sun comets have been
found on SOHO website images; all were Kreutz sungrazers except for
Meyer-group objects C/2007 X7, which were both very small and
stellar in appearance (mag about 7). C/2007 X5 was stellar in
appearance and small (mag about 6.5) in C3 images, and slightly
diffuse with no tail in C2 images. K. Battams describes C/2007 X6
as extremely faint (mag about 8.5), diffuse, and small. C/2007 X8,
C/2007 X9 (which was also found by T. Hoffman), and C/2007 X12 were
tiny and stellar in appearance in C3 images (reaching mag about 7,
except C/2007 X12, which reached mag about 7.5); in C2 images, they
appeared diffuse, with C/2007 X8 appearing a little elongated and
the other two objects showing no tail. C/2007 X10 was teardrop-
shaped and very bright (mag about 3) in C3 images, and showed a
broad head and a thin tail in C2 images. C/2007 X11, which was
also found by H. Su, was very diffuse and faint (mag about 8).
C/2007 X13 was very diffuse, elongated, and reached mag about 7.5.
C/2007 X15 was small and diffuse (mag about 7.5). New finder
codes: MK = M. Kusiak; PC = P. Collison.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 X5 Dec. 7.679 16 53.4 -26 46 C3/2 HS 2008-B36
C/2007 X6 10.314 17 09.1 -24 44 C2 MK 2008-B45
C/2007 X7 10.381 17 06.0 -21 50 C2 HS 2008-B45
C/2007 X8 10.638 17 10.0 -25 31 C3/2 TH 2008-B45
C/2007 X9 12.179 17 17.2 -25 26 C3/2 RM 2008-B45
C/2007 X10 12.488 17 13.5 -29 42 C3/2 TH 2008-B46
C/2007 X11 12.564 17 19.5 -24 55 C2 RK 2008-B46
C/2007 X12 13.738 17 24.5 -25 26 C3/2 RM 2008-B46
C/2007 X13 14.088 17 26.2 -25 04 C2 PC 2008-B46
C/2007 X14 14.163 17 22.9 -22 10 C2 TH 2008-B48
C/2007 X15 15.479 17 34.8 -25 02 C2 HS 2008-B48
[IAUC 8920, 2008 February 11]
COMETS C/2007 Y3-Y9 (SOHO)
Further to IAUC 8920, additional near-sun comets have been
found on SOHO website images; all were Kreutz sungrazers except for
Marsden-group member C/2007 Y4 and Meyer-group member C/2007 Y8 --
both of which were small and stellar in appearance, reaching mag
about 6.5 (though the latter object brightened extremely fast in
the first hour or two of visibility and became noticeably larger in
that time -- atypical for Meyer-group objects). K. Battams
suggested the identity of C/2007 Y4 with C/2002 R4 (cf. MPEC 2002-
S35; IAUC 7984), and B. G. Marsden published a linked orbit on MPEC
2008-B49 that suggests an approach to within 0.063 AU of the earth
on 1997 June 14.7 (T = 1997 May 15.2). C/2007 Y3 was quite diffuse
and small (mag about 7.5). C/2007 Y5 was quite bright (mag about
5.5) and teardrop-shaped (with a hint of a stubby tail). C/2007 Y6
was very diffuse (mag about 8) with a hint of a tail. C/2007 Y7
was tiny and a little diffuse (mag about 8.5). C/2007 Y9 was quite
diffuse, only reaching mag 7.5.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 Y3 Dec. 21.104 17 58.9 -25 14 C2 SY 2008-B49
C/2007 Y4 21.754 18 03.4 -24 07 C2 RK 2008-B49
C/2007 Y5 22.571 18 13.9 -28 25 C3 AK 2008-B49
C/2007 Y6 26.338 18 23.2 -25 00 C2 SY 2008-B49
C/2007 Y7 26.688 18 25.0 -24 47 C2 HS 2008-B49
C/2007 Y8 28.079 18 25.6 -22 10 C2 RK 2008-B61
C/2007 Y9 28.638 18 37.4 -26 06 C3 RM 2008-B61
[IAUC 8921, 2008 February 13]
COMET C/2007 Y10 (SOHO)
Further to IAUC 8921, tabulated below is the "discovery"
observation for an additional Kreutz sungrazing comet found on SOHO
website images; the object appeared stellar (mag about 5.5) in
C3-coronagraph images, and showed a short, faint, diffuse tail in
C2 images.
Comet 2007 UT R.A.(2000)Decl. Inst. F MPEC
C/2007 Y10 Dec. 28.988 18 41.5 -28 06 C3/2 BZ 2008-B61
[IAUC 8923, 2008 March 4]