SOHO Comets 2021

The table list the provisional number for the comet, the day (UT) and month of the first (discovery) observation, the year and comet identification, the LASCO or STEREO coronagraph on which it was discovered, the discoverer (additional names are independent discoverers), with the number of their discoveries given in brackets following the name, and finally the date of discovery.

SOHO Observed   Des C  G  Observers							Discovered
4250 06/12/2007     C2 K  Shihong Yuan							2007 December 6
C    26/01/2018     C3 K  Worachate Boonplod						2018 January 26 = 3488
4257 02/05/2018     C2 K  Worachate Boonplod						2018 May 2
4260 10/05/2018     C3 K  Worachate Boonplod						2018 May 10
0125 07/01/2020     H1 K  Trygve Prestgard							2020 January 14
0126 08/01/2020     H1 K  Trygve Prestgard							2020 January 14
0127 08/01/2020     H1 K  Trygve Prestgard							2020 January 14
0128 08/01/2020     H1 K  Trygve Prestgard							2020 January 14
4116 02/01/2021     C3 K  Michal Biesiada						January 2
4117 05/01/2021     C3 K  Worachate Boonplod						January 5
0121 04/01/2017     H1 K  Trygve Prestgard							January 6
0122 04/01/2017     H1 K  Trygve Prestgard							January 6
0123 04/01/2017     H1 K  Trygve Prestgard							January 6
0124 05/01/2017     H1 K  Trygve Prestgard							January 7
4118 11/01/2021     C2 Y  Worachate Boonplod						January 11
4119 16/01/2021     C3 K  Worachate Boonplod						January 16
4120 17/01/2021     C3 O  Worachate Boonplod						January 17
4128 06/01/2021     C2 Y  Robert Pickard						January 21
4121 21/01/2021     C3 K  Masanori Uchina						January 21
4122 21/01/2021     C2 O  Worachate Boonplod						January 21
4127 31/12/2019     C2 Y  Peter Berrett							January 22
4123 25/01/2021     C3 K  Peiyuan Sun							January 25
4124 24/02/2017     C2 O  Peter Berrett							January 28
4125 21/07/2017     C2 Y  Peter Berrett							January 28
XC97 02/02/2021     C3 O  Parth Bhagat							February 2
C    08/02/2021     C3 D  Worachate Boonplod						February 8 = P/SOHO (1999 J6)
4129 11/02/2021     C3 K  Worachate Boonplod						February 11
4130 11/02/2021     C3 K  Worachate Boonplod						February 11
U?   11/02/2021     C3 K  Worachate Boonplod						February 11
4131 12/02/2021     C3 K  Worachate Boonplod						February 12
4132 14/02/2021     C3 O  Worachate Boonplod						February 14
4133 14/02/2021     C3 K  Szymon Liwo							February 14
4134 23/02/2021     C2 O  Peter Berrett							February 23
4135 24/02/2021     C3 K  Worachate Boonplod						February 24
4136 25/02/2021     C3 K  Worachate Boonplod						February 25
4137 25/02/2021     C3 K  Worachate Boonplod						February 25
4181 15/08/2018     C3 K  Trygve Prestgard						February 26
4138 26/02/2021     C3 K  Worachate Boonplod						February 26
4139 19/02/2021 D1  SW O  Michael Mattiazzo						February 28
4140 04/03/2021     C3 K  Worachate Boonplod						March 4
4154 06/03/2021     C3 K  Michal Biesiada						March 6
4141 08/03/2021     C3 K  Worachate Boonplod						March 8
4142 11/03/2021     C3 K  Sergey Shurpakov						March 11
4143 13/03/2021     C3 K  Sergey Shurpakov						March 13
4144 13/03/2021     C2 K  Masanori Uchina						March 15
4145 20/03/2021     C3 K  Worachate Boonplod						March 20
4146 21/03/2021     C2 Y  Worachate Boonplod						March 21
4147 23/03/2021     C3 K  Worachate Boonplod						March 23
4148 24/03/2021     C3 K  Peiyuan Sun, Michal Biesiada					March 24
4149 26/03/2021     C2 K  Worachate Boonplod						March 26
4182 04/03/2018     C3 K  Trygve Prestgard						March 27
4150 28/03/2021     C2 K  Szymon Liwo							March 28
4151 29/03/2021     C3 K  Peiyuan Sun							March 29
4152 30/03/2021     C3 K  Worachate Boonplod						March 30
4153 30/03/2021     C3 K  Worachate Boonplod						March 30
4155 01/04/2021     C2 K  Rafal Biros							April 1
4156 02/04/2021     C3 K  Worachate Boonplod						April 1
4157 01/04/2021     C2 K  Masanori Uchina						April 2
4158 01/04/2021     C2 K  Masanori Uchina						April 2
4159 07/04/2021     C3 K  Peiyuan Sun							April 7
4160 07/04/2021     C2 K  Szymon Liwo							April 7
4161 08/04/2021     C2 K  Szymon Liwo							April 8
4162 10/04/2021     C3 K  Worachate Boonplod						April 10
4163 11/04/2021     C3 K  Worachate Boonplod						April 11
4164 13/04/2021     C2 K  Worachate Boonplod						April 13
4165 13/04/2021     C3 K  Szymon Liwo							April 13
4166 14/04/2021     C3 K  Peiyuan Sun							April 14
4167 14/04/2021     C2 K  Masanori Uchina						April 14
4168 15/04/2021     C2 K  Masanori Uchina						April 15
4169 16/04/2021     C2 K  Masanori Uchina						April 16
4170 16/04/2021     C2 K  Masanori Uchina						April 16
4183 17/04/2021     C2 K  Worachate Boonplod						April 17
4171 18/04/2021     C2 K  Szymon Liwo							April 18
4172 19/04/2021     C2 K  Worachate Boonplod						April 20
4173 20/04/2021     C2 K  Szymon Liwo							April 20
4174 21/04/2021     C3 K  Worachate Boonplod						April 21
4175 21/04/2021     C2 K  Szymon Liwo							April 21
4176 24/04/2021     C3 K  Worachate Boonplod						April 24
4177 24/04/2021     C3 K  Worachate Boonplod						April 24
4180 20/02/2006     C2 O  Peter Berrett							April 27
4178 29/04/2021     C3 K  Worachate Boonplod						April 29
4179 30/04/2021     C2 K  Worachate Boonplod						April 30
4184 05/05/2021     C2 K  Worachate Boonplod						May 5
4185 07/05/2021     C3 K  Szymon Liwo							May 7
4186 07/05/2021     C2 K  Trygve Prestgard						May 8
4187 10/05/2021     C2 K  Worachate Boonplod						May 10
4188 11/05/2021     C2 K  Worachate Boonplod						May 11
4189 11/05/2021     C2 Y  Worachate Boonplod						May 11
4190 12/05/2021     C2 K  Masanori Uchina						May 12
4191 13/05/2021     C2 K  Worachate Boonplod						May 13
4192 14/05/2021     C2 O  Michal Biesiada						May 14
4193 15/05/2021     C2 K  Worachate Boonplod						May 15
U    15/05/2021     C2 K  Robert Pickard						May 15
4194 16/05/2021     C2 Y  Robert Pickard						May 16
4245 13/01/2004     C2 O  Peter Berrett							May 16
4195 22/05/2021     C3 K  Worachate Boonplod						May 22
4196 22/05/2021     C2 O  Trygve Prestgard						May 22
4197 29/05/2021     C2 K  Robert Pickard						May 29
4198 31/05/2021     C2 K  Worachate Boonplod						May 31
4199 03/06/2021     C2 K  Rafal Biros							June 3
4200 02/06/2021     C2 K  Worachate Boonplod						June 3
     16/06/2018     C2 K  Trygve Prestgard						June 3
4201 04/06/2021     C2 K  Robert Pickard						June 4
4202 03/06/2021     C2 K  Masanori Uchina						June 4
4203 03/06/2021     C2 K  Masanori Uchina						June 4
4204 09/06/2021     C2 K  Worachate Boonplod						June 9
4205 09/06/2021     C2 K  Robert Pickard						June 9
4206 10/06/2021     C2 K  Robert Pickard						June 10
4207 10/06/2021     C2 K  Worachate Boonplod						June 10
4208 13/06/2021     C2 K  Michal Biesiada						June 14
4209 13/06/2021     C2 K  Michal Biesiada						June 14
C    12/06/2021     C2 K  Masanori Uchina						June 14 = 4208
4210 14/06/2021     C2 K  Worachate Boonplod						June 14
4211 18/06/2021     C2 K  Masanori Uchina						June 18
4212 20/06/2021     C2 K  Masanori Uchina						June 20
4213 20/06/2021     C3 K  Worachate Boonplod						June 20
4214 21/06/2021     C3 K  Worachate Boonplod						June 21
4215 21/06/2021     C2 K  Robert Pickard						June 21
4216 23/06/2021     C2 K  Masanori Uchina						June 23
4217 25/06/2021     C2 K  Robert Pickard						June 25
4218 25/06/2021     C2 K  Masanori Uchina						June 25
4219 26/06/2021     C2 K  Rafal Biros							June 26
4220 26/06/2021     C3 K  Worachate Boonplod						June 26
4221 25/06/2021     C2 K  Masanori Uchina						June 26
4222 27/06/2021     C2 K  Michal Biesiada						June 27
4223 27/06/2021     C3 K  Michal Biesiada						June 27
C    27/06/2021     C2 K  Peter Berrett							June 27 = 4222
4224 27/06/2021     C2 K  Rafal Biros							June 28
4225 29/06/2021     C2 K  Robert Pickard						June 29
4226 28/06/2021     C2 K  Robert Pickard						June 29
4227 29/06/2021     C2 K  Rafal Biros							June 29
4228 29/06/2021     C2 K  Rafal Biros							June 29
4229 30/06/2021     C2 K  Michal Biesiada						June 30
4230 19/06/2021     C3 K  Worachate Boonplod						June 19
4231 03/07/2021     C3 K  Worachate Boonplod						July 3
4247 02/07/2006     C2 K  Trygve Prestgard						July 3
4232 03/07/2021     C2 O  Worachate Boonplod						July 3
4233 04/07/2021     C3 K  Worachate Boonplod						July 4
4248 23/05/2007     C2 K  Robert Pickard						July 4
4249 24/10/2007     C2 K  Robert Pickard						July 5
4246 23/05/2006     C2 K  Rafal Biros							July 13
4234 13/07/2021     C3 K  Salil Mulye							July 13
4235 13/07/2021     C3 O  Worachate Boonplod						July 13
4236 13/07/2021     C2 Y  Worachate Boonplod						July 13
4237 14/07/2021     C3 K  Sergey Shurpakov						July 14
4238 16/07/2021     C3 K  Masanori Uchina						July 16
4259 08/05/2018     C2 K  Robert Pickard						July 19
4244 19/04/2001     C2 K  Rafal Biros							July 19
4239 19/07/2021     C3 K  Worachate Boonplod						July 19
4240 20/07/2021     C3 K  Worachate Boonplod						July 20
4258 07/05/2018     C2 K  Robert Pickard						July 23
4253 14/03/2014     C2 O  Peter Berrett							July 25
4262 03/10/2019     C2 K  Rafal Biros							July 25
4241 25/07/2021     C3 K  Masanori Uchina						July 25
4242 27/07/2021     C3 K  Worachate Boonplod						July 27
4254 20/05/2016     C2 K  Robert Pickard						July 28
4243 23/07/2021     C2 O  Peter Berrett							July 28
4252 01/07/2012     C2 O  Peter Berrett							August 6
4264 08/08/2021     C3 K  Worachate Boonplod						August 8
4265 09/08/2021     C3 K  Worachate Boonplod						August 9
4266 11/08/2021     C2 Y  Trygve Prestgard						August 11
4267 14/08/2021     C3 K  Worachate Boonplod						August 14
4268 03/08/2021     C2 O  Peter Berrett							August 14
4251 16/03/2011     C2 D  Peter Berrett							August 20
4269 22/08/2021     C3 K  Peiyuan Sun							August 22
4270 24/08/2021     C3 K  Masanori Uchina						August 24
4255 14/09/2016     C2 O  Peter Berrett							August 25
4271 26/08/2021     C3 K  Masanori Uchina						August 26
4272 27/08/2021     C3 K  Worachate Boonplod, Peiyuan Sun				August 27
4261 13/05/2018     C2 K  Robert Pickard						August 27
4256 04/12/2017     C2 O  Peter Berrett							August 29
4263 23/12/2017     C2 O  Peter Berrett							August 29
4273 31/08/2021     C2 Y  Worachate Boonplod						August 31
4274 02/09/2021     C2 O  Worachate Boonplod						September 2
4351 30/05/2017     C2 O  Peter Berrett							September 5
4352 07/08/2017     C2 Y  Peter Berrett							September 5
4353 02/05/2018     C2 Y  Peter Berrett							September 6
4345 13/05/2009     C2 K  Peter Berrett							September 9
4359 10/05/2020     C2 K  Robert Pickard						September 11
4275 11/09/2021     C3 K  Worachate Boonplod						September 11
4276 11/09/2021     C2 O  Worachate Boonplod						September 11
4277 11/09/2021     C3 K  Masanori Uchina						September 11
4278 12/09/2021     C3 K  Worachate Boonplod						September 12
4279 15/09/2021     C3 K  Worachate Boonplod						September 15
4357 10/05/2019     C2 K  Robert Pickard						September 17
4346 01/11/2014     C2 K  Peter Berrett							September 17
U    10/05/2011     C2 K  Robert Pickard						September 18
4350 11/05/2017     C2 K  Robert Pickard						September 18
4280 18/09/2021     C3 K  Worachate Boonplod						September 18
4356 09/05/2019     C2 K  Robert Pickard						September 18
4358 31/05/2019     C2 K  Peter Berrett							September 18
4354 23/04/2019     C2 K  Peter Berrett							September 19
4355 05/05/2019     C2 K  Robert Pickard						September 26
C    19/02/2021     C2 O  Peter Berrett							September 26 == 4134
4349 09/03/2017     C2 Y  Peter Berrett							September 29
4281 30/09/2021     C3 K  Worachate Boonplod						September 30
4282 02/10/2021     C3 K  Peiyuan Sun							October 2
4283 07/10/2021     C3 K  Worachate Boonplod						October 7
4284 07/10/2021     C2 K  Worachate Boonplod						October 7
4285 11/10/2021     C2 K  Zesheng Yang							October 11
4286 13/10/2021     C2 K  Zesheng Yang							October 13
4287 13/10/2021     C2 K  Worachate Boonplod						October 13
4288 15/10/2021     C3 K  Worachate Boonplod						October 15
4289 15/10/2021     C3 K  Masanori Uchina						October 15
4290 16/10/2021     C2 K  Michal Biesiada, Masanori Uchina				October 16
C    17/10/2021     C3 O  Worachate Boonplod						October 17 = 342P/SOHO
4291 18/10/2021     C2 K  Michal Biesiada, Zesheng Yang					October 18
4292 19/10/2021     C3 K  Worachate Boonplod						October 19
4293 19/10/2021     C2 K  Worachate Boonplod						October 19
4294 21/10/2021     C2 K  Robert Pickard, Michal Biesiada				October 21
4295 22/10/2021     C2 K  Robert Pickard						October 22
4296 27/10/2021     C3 K  Robert Pickard						October 27
4297 27/10/2021     C3 K  Zesheng Yang							October 27
4298 27/10/2021     C2 K  Szymon Liwo, Jiangao Ruan					October 27
4299 27/10/2021     C2 K  Robert Pickard						October 27
4300 30/10/2021     C2 K  Masanori Uchina, Rafal Biros					October 30
4301 02/11/2021     C2 K  Robert Pickard						November 2
4302 03/11/2021     C2 K  Szymon Liwo							November 3
4303 03/11/2021     C3 K  Robert Pickard						November 3
4304 04/11/2021     C2 K  Zesheng Yang, Robert Pickard					November 4
4305 05/11/2021     C2 K  Zesheng Yang							November 5
4306 06/11/2021     C2 Y  Worachate Boonplod						November 6
4307 09/11/2021     C3 K  Worachate Boonplod						November 9
4308 09/11/2021     C2 K  Zesheng Yang, Robert Pickard					November 9
4309 09/11/2021     C3 K  Worachate Boonplod						November 9
4310 09/11/2021     C3 K  Worachate Boonplod						November 9
4311 11/11/2021     C2 K  Zesheng Yang							November 12
4312 16/11/2021     C2 K  Worachate Boonplod						November 16
4313 16/11/2021     C2 K  Worachate Boonplod						November 16
4314 17/11/2021     C2 K  Zesheng Yang							November 17
4315 17/11/2021     C2 K  Worachate Boonplod						November 17
4316 18/11/2021     C2 K  Zesheng Yang							November 18
4317 19/11/2021     C2 Y  Zesheng Yang							November 19
4318 20/11/2021     C3 K  Worachate Boonplod, Robert Pickard				November 20
4319 20/11/2021     C2 K  Worachate Boonplod						November 20
4320 20/11/2021     C3 K  Worachate Boonplod						November 20
XC98 22/05/2008     C2 Y  Peter Berrett							November 21
4321 24/11/2021     C2 K  Zesheng Yang							November 24
4322 26/11/2021     C2 K  Worachate Boonplod						November 26
4323 30/11/2021     C2 K  Robert Pickard						November 30
4324 30/11/2021     C2 K  Zesheng Yang							November 30
4325 30/11/2021     C2 K  Robert Pickard						November 30
4326 01/12/2021     C3 K  Worachate Boonplod, Zesheng Yang				December 1
4327 01/12/2021     C2 K  Zesheng Yang							December 1
U    01/12/2021     C2 K  Zesheng Yang							December 1
4360 01/12/2021     C2 K  Robert Pickard						December 2
4328 03/12/2021     C3 K  Worachate Boonplod						December 3
4329 04/12/2021     C2 K  Zesheng Yang							December 4
     04/12/2021     C3 K  Zesheng Yang							December 4
     05/12/2021     C3 K  Szymon Liwo							December 5
4330 05/12/2021     C3 K  Zesheng Yang							December 5
U    01/12/2021     C2 K  Robert Pickard						December 7
4331 08/12/2021     C3 K  Worachate Boonplod						December 9
4332 09/12/2021     C2 K  Robert Pickard						December 9
0129 04/10/2021     H1 K  Karl Battams							December 9
0130 07/10/2021     H1 K  Karl Battams							December 9
0131 25/10/2021     H1 K  Karl Battams							December 9
4333 10/12/2021     C2 K  Robert Pickard						December 10
4334 12/12/2021     C3 K  Robert Pickard						December 12
4344 06/08/2000     C3 K  Rafael Biros							December 12
4335 13/12/2021     C2 K  Robert Pickard						December 13
4336 16/12/2021     C3 K  Worachate Boonplod						December 16
4337 17/12/2021     C3 K  Szymon Liwo							December 17
4338 18/12/2021     C3 K  Worachate Boonplod						December 18
4339 18/12/2021     C3 K  Worachate Boonplod						December 18
4347 19/05/2016     C2 K  Robert Pickard						December 22
4348 19/05/2016     C2 K  Robert Pickard						December 22
4340 23/12/2021     C3 K  Worachate Boonplod						December 23
4341 23/12/2021     C3 K  Worachate Boonplod						December 23
4342 23/12/2021     C2 K  Zesheng Yang							December 24
U    16/05/2016     C2 K  Robert Pickard						December 27
4343 26/12/2021     C2 K  Trygve Prestgard						December 27
The column headed Des is the half month or other designation of the comet. The column headed C gives the SOHO instrument (C2 or C3 for the LASCO coronagraphs, SW for SWAN, T1 or T2 for STEREO) that the comet was discovered in. The column headed G indicates if it is a provisional member of the Kreutz group (K), Meyer group (Y), Marsden group (D), Kracht (R) or other comet (O). P in the SOHO number column indicates the discovery is pending, C indicates that it is confirmed, but not yet numbered, U indicates that is was not confirmed, X that it was confirmed, but there were insufficient observations.

Note that my observer count also includes X/ comets which are not counted as confirmed comets by the SOHO team. Where two or more people report discoveries nearly simultaneously, up to the first three observers are credited here. Where discoverers are clearly not following the SOHO or BAA Comet Section guidelines, they are not credited here at all. If initial reports don't include sufficient positions others may also be credited.

Official milestones:
Robert Pickard    :    First comet
See also the SOHO December confirmations page for an annual summary

It is possible that there are further comets to be found in the archival data, most likely non-group comets, but there may still be some Kreutz comets.  This has proved to be a correct statement, as seen by the large number of archival confirmations!


Published by Jonathan Shanklin. Jon Shanklin - jds@ast.cam.ac.uk