Updated 2010 Decedmber 27
COMETS C/2008 W1 AND C/2009 A1 (STEREO)
Further to IAUCs 8955 and 9005, K. Battams has measured (and
B. G. Marsden has reduced) astrometry for two additional near-sun
presumed comets that were found on STEREO website images by A.
Watson. C/2008 W1, which was observed only by the 'HI1-B'
instrument (onboard STEREO-B), was a Kreutz sungrazer. C/2008 W1
peaked at magnitude perhaps 9-10; the SOHO LASCO instrument was not
operational when this object was found. C/2009 A1, which was
detected by the HI1 instruments on both STEREO-A and STEREO-B,
belongs to no known group; D. Chestnov and R. Kracht aided in the
finding of images of this object in HI1-B images after it was
initially found in HI1-A images. Battams notes that C/2009 A1 was
very faint, peaking around mag 13 (with 14 being the limiting
magnitude of the HI-1 instruments), and it was small and seemingly
diffuse. The parabolic orbital elements below for C/2009 A1 by
Marsden were published on MPC 65057.
Comet 2008 UT R.A.(2000)Decl. Inst. F MPEC
C/2008 W1 Nov. 18.739 12 28.7 - 7 38 H1B AW 2009-B10
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 A1 Jan. 10.017 22 28.1 - 3 51 H1A AW 2009-B10
T = 2009 Jan. 11.785 TT Peri. = 102.326
Node = 340.014 2000.0
q = 0.12713 AU Incl. = 51.472
[IAUC 9025, 2009 March 5]
COMET C/2009 A6 (STEREO)
Further to IAUC 9051, another slightly diffuse and somewhat
elongated Kreutz sungrazer has been found on STEREO/SECCHI HI-1A
images, reaching peak magnitude about 11.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 A6 Jan. 2.378 22 11.1 -14 25 HI* AW 2009-F31
[IAUC 9053, 2009 June 19]
COMETS C/2009 B6, 2009 B7, 2009 C1, AND 2009 C2 (STEREO)
Further to IAUCs 9053, additional small and slightly diffuse
Kreutz sungrazers have been found on STEREO/SECCHI HI-1A images.
Very approximate peak magnitudes from K. Battams: C/2009 B6 and
C/2009 B7, 11; C/2009 C1, 11-12; C/2009 C2, 10.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 B6 Jan. 19.683 23 21.2 - 8 10 HI* RM 2009-M37
C/2009 B7 29.739 23 57.1 - 3 43 HI* RM 2009-M37
C/2009 C1 Feb. 10.044 0 37.9 + 0 46 HI* RK 2009-M37
C/2009 C2 11.822 0 51.3 + 1 05 HI* KB 2009-M37
[IAUC 9054, 2009 June 29]
COMETS C/2009 A8-A10 AND C/2009 O1 (STEREO)
Further to IAUC 9054, additional Kreutz sungrazers have been
found on STEREO spacecraft images (CO = COR2-A and COR2-B). K.
Battams, Naval Research Laboratory, notes that the three January
comets were all small, faint, and slightly diffuse (mag around
11-12). C/2009 O1, which may have been around mag 6 or 6.5,
appeared as a somewhat-long thin streak with no discernable head or
coma in COR2-A images; in COR2-B images, the comet appeared much
more condensed (possibly slightly diffuse and with a hint of a
barely detectable tail).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 A8 Jan. 4.544 22 19.2 -13 58 H1A AW 2009-O25
C/2009 A9 10.600 22 44.7 -11 41 H1A RM 2009-O25
C/2009 A10 10.794 22 43.2 -11 26 H1A AW 2009-O25
C/2009 O1 July 18.870 11 12.2 + 2 32 CO MK 2009-O25
[IUAC 9057, 2009 July 30]
COMET 2009 F6
On Apr. 4, R. D. Matson informed the Central Bureau that he
had found a possible comet on ultraviolet SWAN images posted at the
SOHO website, providing the rough positions below, and a search
ephemeris was then posted at the Minor Planet Center's 'NEOCP'
webpage. Numerous CCD astrometrists and one visual observer have
reported confirmation of the object as a comet, with selected
positions provided below.
2009 UT R.A. (2000) Decl. Mag. Observer
Mar. 29 23 03 +51.5 SWAN
31 23 16 +52.5 "
Apr. 1 23 24 +53 "
3 23 36 +53 "
4 23 46 +54 "
6.15 23 54.0 +54 41.5 8.2 Gonzalez
6.20771 23 54 17.90 +54 42 26.3 14.5 Hormuth
6.45823 23 56 18.14 +54 47 35.9 13.8 Guido
6.69785 23 58 12.89 +54 52 24.1 12.0 Kryachko
6.77483 23 58 50.08 +54 53 56.5 12.7 Ligustri
6.77945 23 58 51.85 +54 53 59.9 Ikari
6.80162 23 59 03.04 +54 54 28.3 13.5 Bittesini
6.80936 23 59 06.91 +54 54 36.7 11.3 Manca
6.84729 23 59 25.31 +54 55 21.3 13.0 Buzzi
J. J. Gonzalez (Burgos, Spain). Visual, 15-cm reflector; coma
diameter 6'.
F. Hormuth (Almeria, Spain). 1.23-m reflector; 1'.5 coma with a
well-defined core, in twilight.
E. Guido, G. Sostero, and P. Camilleri (Mayhill, NM, U.S.A.).
Remotely controlled 25-cm f/3.4 reflector; diffuse coma about
2'.5 in diameter, with a sharp central condensation about 20" in
diameter.
T. Kryachko, S. Korotkiy, and B. Satovski (Zelenchukskaya). 30-cm
reflector; bright 118" x 129" coma (major axis in p.a. 252 deg)
with condensation.
R. Ligustri and P. Beltrame (Talmassons, Italy). 35-cm reflector.
Coma diameter about 30".
Y. Ikari (Moriyama, Shiga-ken, Japan). 26-cm f/7 reflector; 0'.7
coma.
L. Bittesini, D. Di Maria, E. Pettarin, and F. Piani (Farra
d'Isonzo, Italy). 30-cm f/4.5 reflector; coma diameter about 50".
F. Manca and A. Testa (Garbagnate Monastero, Italy). 50-cm
reflector.
L. Buzzi (Varese, Italy). 60-cm refl.; 1'.5 coma, strong central
condensation.
[IAUC 9034, 2009 April 6]
COMET C/2009 G1 (STEREO)
Further to IAUC 9032, K. Battams reports that a slightly
diffuse comet of mag about 10-11 with no apparent tail (discovery
observation tabulated below) has been found on SECCHI HI-1B images
(cf. IAUC 8930, 8955).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 G1 Apr. 3.572 21 03.2 - 6 25 HI* JR 2009-G30
[IAUC 9036, 2009 April 9]
COMET C/2009 G1 (STEREO)
K. Kadota (Ageo, Japan) has reported astrometry on Apr. 9.8 UT
with a 25-cm reflector, which shows that the prediction on IAUC
9036 was off by about 4'. He found the comet to have total mag
10.6, a coma diameter of 4'.5, and strong central condensation; his
astrometry and the following revised orbital elements appear on
MPEC 2009-G32:
T = 2009 Apr. 15.093 TT Peri. = 173.823
Node = 120.657 2000.0
q = 1.12993 AU Incl. = 108.091
COMET C/2009 F6 (YI-SWAN)
S. Korotskiy, Moscow, reports that he found a prediscovery
image of this comet (cf. IAUCs 9034, 9035) on an exposure (limiting
mag about 13) taken with a Canon EOS 20D digital camera (+ 50-mm
f/4 lens) at the Kazan State University observatory at Karachay-
Cherkessia, as given below:
2009 UT R.A. (2000) Decl. Mag.
Mar. 25.06024 22 28 28.8 +48 45 14 10.7
[IAUC 9037, 2009 April 10]
COMETS C/2009 A2, C/2009 A3, C/2009 A4, C/2009 A5 (SOHO)
Further to IAUC 9039, additional Kreutz sungrazers have been
found on SOHO website images, being tiny and stellar in appearance
(peak mag about 7.5, except C/2009 A2 at mag about 7) in C3 images.
C/2009 A3 was small and "roughly stellar" in C2 images. All except
C/2009 A2 (condensed, and teardrop-shaped) were slightly diffuse
and elongated (peak mag about 11, except C/2009 A2 and A3 at mag
about 10) in STEREO HI1-A images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 A2 Jan. 1.054 18 55.8 -25 55 C3 HS 2009-F18
C/2009 A3 1.613 18 58.2 -25 28 C3/2 HS 2009-F30
C/2009 A4 2.154 19 01.1 -25 14 C3 HS 2009-F30
C/2009 A5 2.488 19 05.1 -25 39 C3 HS 2009-F30
[IAUC 9042, 2009 May 8]
COMETS C/2009 A7, C/2009 B8-B11, AND C/2009 C3-C4 (SOHO)
Further to IAUC 9042, additional apparent comets have been
found on SOHO website images -- all Kreutz sungrazers except for
C/2009 B10 (Meyer group). C/2009 A7 was stellar in appearance (mag
about 7-7.5) in the C3 images; it was also imaged with the SECCHI
HI-1A camera, which showed it to be small and slightly diffuse at
mag about 11. C/2009 B8 was slightly diffuse (mag about 7).
C/2009 B9 was stellar in appearance (mag about 7.5). C/2009 B10
was stellar in appearance (mag about 7.5) and perhaps slightly
elongated. C/2009 B11 was also stellar in appearance (mag about 7-
7.5). C/2009 C3 was bright (mag about 2-3) with a thin tail in C3
images, while in C2 images it showed a long, thin tail that went
past the field-of-view and showed no appreciable 'head'. C/2009 C4
was slightly elongated, peaking at mag about 7 (and brightening in
the last image).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 A7 Jan. 4.513 19 14.0 -24 40 C3* AK 2009-M41
C/2009 B8 20.971 20 28.0 -21 46 C3 BZ 2009-M41
C/2009 B9 29.238 21 01.3 -20 01 C3 ZX 2009-M41
C/2009 B10 29.271 20 51.3 -16 28 C2 ZX 2009-M42
C/2009 B11 30.804 21 09.7 -18 51 C3 TH 2009-M42
C/2009 C3 Feb. 4.279 21 40.6 -18 41 C3/2 RM 2009-M42
C/2009 C4 7.936 21 52.8 -17 05 C3 BZ 2009-M54
[IAUC 9055, 2009 July 6]
COMETS C/2009 C5 AND C/2009 D2-D4 (SOHO)
Additional Kreutz sungrazers have been found on SOHO website
images (cf. IAUC 9055; ML = M. Kaluzny). C/2009 C5 was faint and
slightly diffuse, peaking at mag about 7. C/2009 D2 and C/2009 D3
were small and stellar in appearance, peaking at mag about 7 and
7-7.5, respectively. C/2009 D4 showed a long, thin tail that was
visible in C3 images (which showed a small head that peaked at mag
about 2-3 and a tail length of about 1 degree) as well as in C2
SOHO images and in SECCHI COR2-A and COR2-B images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 C5 Feb. 11.529 21 54.9 -14 33 C3 ML 2009-M54
C/2009 D2 19.179 22 27.5 -12 11 C3 JR 2009-M54
C/2009 D3 19.321 22 26.9 -11 52 C3 BZ 2009-M54
C/2009 D4 21.943 22 53.8 -11 59 C3/2* TH 2009-M55
[IAUC 9056, 2009 July 14]
OMETS C/2009 D5 AND C/2009 D6 (SOHO)
Further to IAUC 9058, starlike apparent comets have been found
on SOHO website images: C/2009 D5 was a Kreutz object (mag about
6.5-7), while Meyer-group member C/2009 D6 was slightly elongated
(mag about 7).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 D5 Feb. 23.679 22 48.1 -10 41 C3 MK 2009-M55
C/2009 D6 24.814 22 37.2 - 7 26 C2 RK 2009-M55
[IAUC 9059, 2009 July 31]
COMETS C/2009 L3-L17, C/2009 M1, AND C/2009 M2 (SOHO)
Further to IAUC 9059, additional presumed comets have been
found on SOHO website images, all being Kreutz sungrazers except
for C/2009 L8 and C/2009 L13 (Kracht group). C/2009 L3 was very
diffuse and slightly elongated (mag about 7.5). C/2009 L4 was
stellar in appearance (mag about 6.5) in C3 images but quite large
and very condensed with no visible tail in C2 images; COR2-A STEREO
images show a bright starlike head and a very faint, thin tail.
C/2009 L5, C/2009 L7, C/2009 L11 (also described as small), and
C/2009 L15 were slightly diffuse (peak magnitudes about 7.5, 7.5-8,
8, and 8, respectively). C/2009 L6 was stellar in appearance (mag
about 6.5-7) in C3 images, and condensed with no tail in C2 images.
C/2009 L8 (mag about 7-7.5) and C/2009 L13 (mag about 7.5-8) were
small and stellar in appearance. C/2009 L9 and C/2009 L12 were
very diffuse (mag about 8). C/2009 L10 (slightly diffuse), C/2009
L14 (quite diffuse), and C/2009 M1 (quite diffuse) were very faint
(mag about 8.5). C/2009 L16 was quite diffuse (mag about 7.5).
C/2009 L17 was stellar in appearance (mag about 6.5) in C3 images,
but quite diffuse with a short, faint tail in C2 images. C/2009
M2 was small and stellar in appearance (mag about 7) in C3 images,
and showed a hint of a very faint tail in C2 images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 L3 June 3.785 4 45.2 +20 33 C2 RK 2009-O19
C/2009 L4 3.888 4 48.7 +18 35 C3/2* BZ 2009-O19
C/2009 L5 4.893 4 49.3 +20 39 C2 RK 2009-O19
C/2009 L6 5.988 4 55.2 +19 25 C3/2 BZ 2009-O19
C/2009 L7 1.381 4 35.2 +20 12 C2 BZ 2009-O21
C/2009 L8 6.979 4 51.8 +22 41 C2 TH 2009-O21
C/2009 L9 7.229 4 56.6 +20 51 C2 GS 2009-O21
C/2009 L10 7.329 4 58.4 +20 57 C2 BZ 2009-O21
C/2009 L11 7.671 5 00.3 +20 56 C2 MK 2009-O21
C/2009 L12 8.893 5 02.7 +20 54 C2 MU 2009-O22
C/2009 L13 9.185 5 12.1 +23 26 C2 RK 2009-O22
C/2009 L14 10.185 5 09.8 +21 09 C2 BZ 2009-O22
C/2009 L15 10.910 5 12.2 +21 11 C2 RM 2009-O22
C/2009 L16 14.393 5 25.8 +21 22 C2 MK 2009-P01
C/2009 L17 15.013 5 25.0 +20 18 C3/2 MU 2009-P01
C/2009 M1 21.838 5 55.1 +21 42 C2 BZ 2009-P01
C/2009 M2 22.238 5 56.5 +20 42 C3/2 MK 2009-P01
[IAUC 9065, 2009 August 22]
COMETS C/2009 D7 AND C/2009 D8 (SOHO)
Further to IAUC 9059, additional presumed comets have been
found on SOHO website images. C/2009 D7 was bright (mag about 4)
with a short tail in LASCO C3 images, while it showed a short tail
and faded quickly in C2 images; this comet was also detected in
STEREO COR2-A and COR2-B images with a tail about 0.3 deg long.
C/2009 D8 was slightly elongated, small, and stellar in apperance
(mag about 7, but it faded rapidly).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 D7 Feb. 26.029 23 09.7 -10 31 C3/2* MU 2009-N01
C/2009 D8 26.129 22 42.2 - 7 03 C2 BZ 2009-N01
[IAUC 9070, 2009 September 1]
COMETS C/2009 E2-E5, C/2009 F8, AND C/2009 F9 (SOHO)
Further to IAUCs 9065 and 9070, additional presumed comets
have been found on SOHO website images -- all Kreutz sungrazers
except for C/2009 E3 (Meyer group). C/2009 E2 (also found by B.
Zhou) was small and slightly diffuse (mag about 7). C/2009 E3 was
tiny and stellar in appearance (mag about 7.5-8), and it faded
rapidly. C/2009 E4 was small and slightly diffuse (mag about 6.5-7)
in C3 images; in C2 images it was faint, diffuse, and slightly
elongated. C/2009 E5 was very diffuse (mag about 8). C/2009 F8
was slightly diffuse (mag about 7-7.5) in C3 images, and small and
elongated in C2 images. C/2009 F9 was very small and condensed
(mag about 7.5) in C3 images, and slightly elongated (but stellar
in appearance) in C2 images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 E2 Mar. 1.221 23 07.6 - 8 16 C3 MK 2009-N01
C/2009 E3 7.463 23 17.1 - 3 27 C2 EB 2009-N01
C/2009 E4 10.138 23 44.8 - 5 09 C3/2 WX 2009-N01
C/2009 E5 10.229 23 30.5 - 4 49 C2 BZ 2009-N29
C/2009 F8 16.862 0 04.1 - 2 09 C3/2 MU 2009-N29
C/2009 F9 28.471 0 44.4 + 2 17 C3/2 HS 2009-N29
[IAUC 9077, 2009 September 28]
COMETS C/2009 F10, C/2009 G2-G6 (SOHO)
Further to IAUC 9077, additional Kreutz sungrazers have been
found on SOHO website images. All were very diffuse except for
C/2009 G2 (which was small and elongated, with a short, faint tail)
and C/2009 G3 (which was small and condensed, peaking at mag about
7 in C3 images, though C2 images showed it to have a hint of a tail
and a 'lump' suggestive of possible fragmenting). Approximate peak
magnitudes in C2 images: C/2009 F10, 8-8.5; C/2009 G2, 7; C/2009
G4, 8.5; C/2009 G5 and C/2009 G6, 8.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 F10 Mar. 30.038 0 43.5 + 3 09 C2 MU 2009-N29
C/2009 G2 Apr. 2.104 0 52.4 + 3 52 C2 HS 2009-N30
C/2009 G3 2.113 1 04.4 + 3 47 C3/2 BZ 2009-N30
C/2009 G4 4.646 1 03.9 + 5 13 C2 AK 2009-N30
C/2009 G5 6.963 1 12.1 + 6 02 C2 HS 2009-N30
C/2009 G6 10.329 1 24.6 + 7 11 C2 BZ 2009-N30
[IAUC 9079, 2009 October 9]
COMETS C/2009 G7, C/2009 G8, C/2009 H3 (SOHO)
Further to IAUC 9079, additional presumed comet have been
found on SOHO website images. K. Battams reports that C/2009 G7, a
Kreutz sungrazer, was stellar in appearance and tiny (mag about 7)
in C3 images, and small and condensed in C2 images. C/2009 G8, a
non-group comet, was slightly diffuse and elongated (mag about
7-7.5). C/2009 H3, also a Kreutz sungrazer, was diffuse and
elongated (mag about 8).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 G7 Apr. 13.488 1 44.8 + 6 34 C3/2 AK 2009-N33
C/2009 G8 13.963 1 33.2 +11 20 C2 BZ 2009-N33
C/2009 H3 18.504 1 51.9 + 9 46 C2 MK 2009-N33
[IAUC 9080, 2009 October 11]
COMETS C/2009 H4-H8 (SOHO)
Further to IAUC 9080, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 H4 was small, slightly
diffuse, and slightly elongated (peak mag about 8). C/2009 H5 was
diffuse with a short, faint tail (mag about 7.5). C/2009 H6 (mag
about 7), C/2009 H7 (mag about 8.5), and C/2009 H8 (mag about 7-7.5)
were all small and stellar in appearance.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 H4 Apr. 19.476 1 56.9 +10 16 C2 MK 2009-N33
C/2009 H5 22.351 2 03.9 +10 50 C2 BZ 2009-N34
C/2009 H6 23.976 2 12.8 +11 43 C2 BZ 2009-N34
C/2009 H7 24.243 2 14.1 +11 46 C2 RK 2009-N34
C/2009 H8 24.471 2 22.5 +11 00 C3 RM 2009-N34
[IAUC 9083, 2009 October 15]
COMETS C/2009 J1 AND C/2009 J2 (SOHO)
Further to IAUC 9083, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 J1 was slightly diffuse with
a short tail (peak mag about 6.5-7). C/2009 J2 was very faint (mag
about 8-8.5) and diffuse.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 J1 May 3.008 2 45.9 +14 20 C2 MU 2009-N46
C/2009 J2 3.458 2 47.6 +14 27 C2 MK 2009-N46
[IAUC 9084, 2009 October 21]
COMETS C/2009 J3-J10 (SOHO)
Further to IAUC 9084, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 J3 (peak mag about 6.5),
C/2009 J5 (mag about 8-8.5), C/2009 J7 (mag about 8.5), and C/2009
J9 (mag about 7.5-8) were all stellar in appearance and generally
small or tiny. C/2009 J4 was a diffuse streak (mag about 7.5-8).
C/2009 J6 was slightly diffuse and tiny (mag about 7.5) in C3
images, and slightly diffuse but elongated in C2 images. C/2009 J8
was quite condensed (mag about 7). C/2009 J10 was quite diffuse
and slightly elongated (mag about 7.5-8).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 J3 May 3.846 2 51.6 +13 05 C3 TH 2009-N46
C/2009 J4 5.033 2 50.3 +14 41 C2 MU 2009-N46
C/2009 J5 6.192 2 56.8 +15 05 C2 BZ 2009-N46
C/2009 J6 6.529 3 00.7 +14 54 C3/2 RK 2009-N47
C/2009 J7 6.617 2 58.8 +15 15 C2 ML 2009-N47
C/2009 J8 8.633 3 06.2 +15 50 C2 MK 2009-N47
C/2009 J9 9.576 3 09.7 +15 59 C2 MK 2009-N47
C/2009 J10 11.351 3 16.1 +16 26 C2 RK 2009-N49
[IAUC 9088, 2009 October 25]
COMETS C/2009 J11, C/2009 J12, AND C/2009 K6 (SOHO)
Further to IAUC 9088, two additional near-sun presumed comets
have been found on SOHO website images. C/2009 J11, a Kreutz
sungrazer, was tiny and stellar in appearance in C3 images (peak
mag about 7-7.5), but slightly diffuse with a hint of a very faint
tail in C2 images. C/2009 J12 (a Marsden-group member; mag about
7.5-8) and C/2009 K6 (also a Kreutz sungrazer; mag about 7) were
also stellar in appearance.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 J11 May 13.221 3 23.9 +16 24 C3/2 BZ 2009-N49
C/2009 J12 15.579 3 34.5 +19 23 C2 RK 2009-N49
C/2009 K6 17.229 3 38.0 +17 48 C2 BZ 2009-N49
[IAUC 9090, 2009 October 29]
COMETS C/2009 K7-K12 (SOHO)
Further to IAUC 9090, additional Kreutz sungrazers have been
found on SOHO website images. K. Battams notes that C/2009 K7 was
small and perhaps slightly diffuse (peak mag about 7.5) in C3
images, but quite diffuse and slightly elongated in C2 images.
C/2009 K8 was tiny and stellar in appearance (mag about 8.5).
C/2009 K9 was slightly diffuse (mag about 7) in C3 images, but
quite diffuse with a short tail (and a "knot" in the tail) in C2
images. C/2009 K10 was a "very diffuse streak" (mag about 7.5).
C/2009 K11 was stellar in appearance (mag about 6.5) in C3 images,
but slightly diffuse and fading very fast in C2 images. C/2009 K12
was diffuse (mag about 8).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 K7 May 20.346 3 49.1 +17 27 C3/2 BZ 2009-N50
C/2009 K8 24.254 4 05.0 +19 04 C2 MK 2009-N50
C/2009 K9 26.988 4 18.1 +18 31 C3/2 MU 2009-N50
C/2009 K10 27.938 4 18.6 +19 39 C2 MU 2009-N50
C/2009 K11 29.221 4 24.2 +18 14 C3/2 MU 2009-O18
C/2009 K12 30.397 4 28.0 +20 02 C2 MK 2009-O18
[IAUC 9091, 2009 November 2]
COMETS C/2009 K13 AND C/2009 K14 (SOHO)
Further to IAUC 9091, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 K13 was slightly diffuse and
small (mag about 8). C/2009 K14 was very diffuse and very faint
(mag about 8-8.5).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 K13 May 31.171 4 31.0 +20 05 C2 BZ 2009-O18
C/2009 K14 31.746 4 31.4 +20 02 C2 BZ 2009-O18
[IAUC 9092, 2009 November 4]
COMET C/2009 M3 (SOHO)
Further to IAUC 9092, another Kreutz sungrazer has been found
on SOHO website images. C/2009 M3 was stellar in appearance (peak
mag about 6.5-7) on C3 images, but slightly diffuse and elongated
in C2 images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 M3 June 22.700 5 57.8 +20 35 C3/2 BZ 2009-P02
[IAUC 9094, 2009 November 11]
COMETS C/2009 M4 AND C/2009 M5 (SOHO)
Further to IAUC 9094, additional Kreutz sungrazers have been
found on SOHO website images. C/2009 M4 was small and stellar in
appearance (peak mag about 7) on C3 images, but quite diffuse (mag
about 8.5) and elongated in C2 images. C/2009 M5 was very faint
(mag about 8.5) and very diffuse.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 M4 June 24.488 6 04.5 +21 06 C3/2 RK 2009-P02
C/2009 M5 25.038 6 07.6 +21 50 C2 BZ 2009-P02
[IAUC 9112, 2010 January 28]
COMETS C/2009 M6, C/2009 M7, C/2009 M8, C/2009 N1 (SOHO)
Additional presumed comets have been found on SOHO website
images -- Kreutz sungrazers except for C/2009 M8 and C/2009 N1
(non-group). C/2009 M6 was very faint (mag about 8.5) and slightly
diffuse. C/2009 M7 was diffuse (mag about 8). C/2008 M8 was
appeared stellar, appearing quite bright (mag about 6.5-7) but
fading fast in C2 images. C/2009 N1 was slightly diffuse (mag
about 7) in C3 images, and a faint, diffuse streak in C2 images.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 M6 June 25.604 6 09.9 +21 52 C2 MU 2009-P02
C/2009 M7 26.908 6 15.3 +21 48 C2 BZ 2009-P20
C/2009 M8 30.071 6 32.4 +25 58 C3/2 RK 2009-P20
C/2009 N1 July 2.596 6 42.8 +26 41 C3/2 BZ 2009-P20
[IAUC 9113, 2010 January 29]
COMETS C/2009 N2, C/2009 N3, C/2009 O5, C/2009 P3 (SOHO)
Additional presumed comets have been found on SOHO website
images -- Kreutz sungrazers except for C/2009 N3 (non-group).
C/2009 N2 was small and stellar in appearance (mag about 7-7.5) in
C3 images, but small and slightly diffuse in C2 images. C/2009 N3
was stellar in appearance and brighter (mag about 6.5-7 at about
July 5.04 UT). C/2009 O5 was also stellar in appearance (mag about
6.5). C/2009 P3 was slightly elongated (mag about 5.5-6).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 N2 July 4.179 6 42.5 +20 51 C3/2 MK 2009-P20
C/2009 N3 4.896 6 47.8 +22 59 C2 BZ 2009-P20
C/2009 O5 29.154 8 16.1 +17 01 C3 BZ 2009-W09
C/2009 P3 Aug. 1.196 8 23.5 +15 28 C3 MK 2009-W09
[IAUC 9114, 2010 February 5]
COMETS C/2009 P4, C/2009 P5, C/2009 Q6, C/2009 Q7 (SOHO)
Further to IAUCs 9112, 9113, and 9114, additional Kreutz
sungrazers have been found on SOHO website images. All were small
and stellar in appearance except for C/2009 P5 (slightly elongated,
with peak mag about 6.5). C/2009 P4 and C/2009 Q6 peaked near mag
7, whereas C/2009 Q7 (which was also found by M. Kusiak) peaked
near mag about 7-7.5.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 P4 Aug. 9.971 9 03.1 +14 20 C3 BZ 2009-W09
C/2009 P5 11.071 8 59.4 +13 21 C3 BZ 2009-W09
C/2009 Q6 20.904 9 41.8 +11 11 C3 ZX 2009-W10
C/2009 Q7 22.763 9 51.5 +10 49 C3 ZX 2009-W10
[IAUC 9115, 2010 February 8]
COMETS C/2009 Q8, C/2009 V1, C/2009 V2 (SOHO)
Further to IAUC 9115, additional Kreutz sungrazers have been
found on SOHO website images. K. Battams notes that C/2009 Q8 was
small and stellar in appearance (peak mag about 6.5-7). Comets
C/2009 V1 and C/2009 V2 were very faint (peak mag about 8-8.5) and
slightly diffuse. A. Watson also found images for the latter two
comets in STEREO/SECCHI HI-1 website data.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 Q8 Aug. 31.138 10 20.4 + 7 49 C3 MU 2009-W10
C/2009 V1 Nov. 5.054 14 32.6 -17 21 C3 MU 2010-B27
C/2009 V2 5.571 14 32.7 -17 53 C3 MU 2010-B27
[IAUC 9116, 2010 February 9]
COMETS C/2009 Y3 AND C/2009 Y4 (STEREO)
Further to IAUC 9057, additional Kreutz sungrazers have been
found on STEREO HI-1 website images (and subsequently on SOHO
website images). K. Battams notes that C/2009 Y3 was found by M.
Uchina in SOHO C2 website data, where it peaked at mag about 7-7.5
and showed a 'double nucleus' that was not visible in HI-1 images.
C/2009 Y4 was bright (perhaps near mag 1 at peak), saturating SOHO
C3 and C2 images, where the tail was > 1 deg long; in HI-1 images,
the tail was several degrees long.
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 Y3 Dec. 19.184 12 50.3 - 9 58 HI-1 AW 2010-B28
C/2009 Y4 31.128 13 05.8 -16 31 HI-1 AW 2010-B28
[IAUC 9117, 2010 February 16]