MPEC 2021-M86 : COMET C/2021 G3 (PANSTARRS)
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M.P.E.C. 2021-M86 Issued 2021 June 25, 05:13 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Division F of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL https://www.minorplanetcenter.net/ ISSN 1523-6714
COMET C/2021 G3 (PANSTARRS)
This object was reported as a Near-Earth Object candidate by Pan-STARRS 1
(F51) on Apr. 1 UT. R. Weryk reports detecting cometary activity in three
60-second follow-up images taken at Mauna Kea CFHT (568) on Apr. 6, noting a
very condensed 0".3 coma and a straight 2" tail at position angle 135.
Prediscovery positions were reported back to Feb 2021.
Observations:
CK21G030 C2021 02 09.29680 09 53 27.56 -09 31 54.9 VEM086G96
CK21G030 C2021 02 09.30195 09 53 27.33 -09 31 51.6 21.2 GVEM086G96
CK21G030 C2021 02 09.30709 09 53 27.05 -09 31 48.6 VEM086G96
CK21G030 C2021 03 20.24410109 25 34.69 -01 29 11.8 22.74GVEM086V00
CK21G030 C2021 03 20.24898809 25 34.53 -01 29 08.6 VEM086V00
CK21G030 C2021 03 20.25387109 25 34.37 -01 29 04.5 22.24GVEM086V00
CK21G030 C2021 03 20.25875609 25 34.20 -01 29 00.3 22.55GVEM086V00
CK21G030* C2021 04 01.25513209 19 28.744+01 01 52.59 22.17wUEM086F51
CK21G030 C2021 04 01.26844709 19 28.383+01 02 02.16 22.32wUEM086F51
CK21G030 C2021 04 01.29498709 19 27.676+01 02 21.63 22.26wUEM086F51
CK21G030 |C2021 04 02.01244 09 19 09.28 +01 11 07.7 21.6 GVEM086807
CK21G030 |C2021 04 02.01806 09 19 09.13 +01 11 11.5 21.7 GVEM086807
CK21G030 |C2021 04 02.02372 09 19 08.96 +01 11 15.7 21.7 GVEM086807
CK21G030 KC2021 04 02.06326409 19 07.96 +01 11 42.7 22.1 VuEM086H21
CK21G030 KC2021 04 02.06934709 19 07.82 +01 11 47.1 21.9 VuEM086H21
CK21G030 KC2021 04 02.07320109 19 07.71 +01 11 50.0 22.0 VuEM086H21
CK21G030 KC2021 04 02.11829 09 19 06.59 +01 12 21.6 oEM086291
CK21G030 KC2021 04 02.13563 09 19 06.17 +01 12 35.4 22.1 RoEM086291
CK21G030 KC2021 04 02.14713609 19 05.77 +01 12 43.9 21.96GVEM086V06
CK21G030 KC2021 04 02.15268009 19 05.66 +01 12 47.9 23.02GVEM086V06
CK21G030 KC2021 04 02.15822709 19 05.50 +01 12 51.5 21.67GVEM086V06
CK21G030 KC2021 04 03.13956509 18 41.06 +01 24 43.7 21.76GVEM086V06
CK21G030 KC2021 04 03.14590209 18 40.92 +01 24 49.0 22.44GVEM086V06
CK21G030 KC2021 04 03.15224209 18 40.73 +01 24 53.2 22.03GVEM086V06
CK21G030 KC2021 04 04.14096809 18 16.85 +01 36 46.8 21.65GVEM086V06
CK21G030 KC2021 04 04.14730209 18 16.67 +01 36 51.6 22.21GVEM086V06
CK21G030 KC2021 04 04.15363909 18 16.52 +01 36 56.1 21.87GVEM086V06
CK21G030 1C2021 04 04.40955 09 18 10.51 +01 40 02.2 VEM086Q62
CK21G030 1C2021 04 04.41933 09 18 10.28 +01 40 08.9 21.5 GVEM086Q62
CK21G030 ^C2021 04 06.27858209 17 27.804+02 02 13.31 22.08GVEM086568
CK21G030 ^C2021 04 06.27979209 17 27.775+02 02 14.18 22.14GVEM086568
CK21G030 ^C2021 04 06.28100509 17 27.743+02 02 15.09 22.65GVEM086568
CK21G030 KC2021 04 11.17602 09 15 49.31 +02 58 58.2 21.6 RoEM086291
CK21G030 KC2021 04 11.19102 09 15 49.01 +02 59 08.3 21.9 RoEM086291
CK21G030 KC2021 04 11.20601 09 15 48.73 +02 59 18.5 21.6 RoEM086291
CK21G030 KC2021 05 07.95469909 12 29.45 +07 26 01.2 21.6 GXEM086Y00
CK21G030 KC2021 05 07.98355909 12 29.54 +07 26 16.1 21.1 GXEM086Y00
CK21G030 KC2021 05 08.01261009 12 29.57 +07 26 31.7 21.6 GXEM086Y00
CK21G030 KC2021 05 12.18123 09 12 47.47 +08 01 05.6 21.7 RoEM086291
CK21G030 KC2021 05 12.19785 09 12 47.57 +08 01 13.7 22.6 RoEM086291
CK21G030 KC2021 05 12.21447 09 12 47.69 +08 01 22.2 oEM086291
CK21G030 KC2021 05 13.16638 09 12 53.40 +08 08 59.9 oEM086291
CK21G030 KC2021 05 13.17935 09 12 53.56 +08 09 05.9 oEM086291
CK21G030 KC2021 05 13.19236 09 12 53.62 +08 09 12.2 21.8 RoEM086291
Observer details:
291 LPL/Spacewatch II. Observers T. H. Bressi, M. T. Read, J. V. Scotti.
1.8-m f/2.7 reflector + CCD.
568 Mauna Kea. Observers R. Wainscoat, H. Januszewski, T. Burdullis.
Measurers R. Weryk, R. Wainscoat. 3.6-m Canada-France-Hawaii Telescope +
CCD.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes.
1.00-m f/10.0 astrograph + CCD.
F51 Pan-STARRS 1, Haleakala. Observers J. Bulger, T. Lowe, A. Schultz, M.
Willman. Measurers K. Chambers, S. Chastel, T. de Boer, L. Denneau, J.
Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo,
R. Wainscoat, R. Weryk. 1.8-m Ritchey-Chretien + CCD.
G96 Mt. Lemmon Survey. Observer G. J. Leonard. Measurers E. J. Christensen,
B. Gray, D. Rankin, F. C. Shelly. 1.5-m reflector + 10K CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers S. Foglia, L. Buzzi, T. Linder, R. Holmes. 1.3-m f/4.0
astrograph + CCD.
Q62 iTelescope Observatory, Siding Spring. Observer H. Sato. 0.51-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
V00 Kitt Peak-Bok. Observer H. Groeller. Measurers M. J. Brucker, E. J.
Christensen, C. E. Woodward, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D.
Grauer, H. Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. S.
McMillan, T. A. Pruyne, D. Rankin, R. L. Seaman, F. C. Shelly, K. W.
Wierzchos. 2.25-m reflector + CCD.
V06 Catalina Sky Survey-Kuiper. Observer H. Groeller. Measurers E. J.
Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H.
Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, T. A. Pruyne, D.
Rankin, R. L. Seaman, F. C. Shelly, K. W. Wierzchos. 1.55-m reflector +
1K CCD.
Y00 SONEAR Observatory, Oliveira. Observers C. Jacques, E. Pimentel, J.
Barros. Measurer C. Jacques. 0.45-m f/2.9 reflector + CCD.
Orbital elements:
C/2021 G3 (PANSTARRS)
Epoch 2021 Nov. 2.0 TT = JDT 2459520.5
T 2021 Oct. 18.62372 TT Rudenko
q 5.1811370 (2000.0) P Q
z -0.0002128 Peri. 10.65009 -0.80592481 +0.27372234
+/-0.0000303 Node 147.41877 +0.44574176 -0.30299001
e 1.0011026 Incl. 102.88305 +0.38961452 +0.91283796
From 44 observations 2021 Feb. 9-May 13, mean residual 0".3.
C/2021 G3 (PANSTARRS)
Epoch 2021 July 5.0 TT = JDT 2459400.5
T 2021 Oct. 18.72930 TT Rudenko
q 5.1810863 (2000.0) P Q
z -0.0002237 Peri. 10.66266 -0.80586564 +0.27389626
+/-0.0000303 Node 147.41881 +0.44567394 -0.30309218
e 1.0011590 Incl. 102.88274 +0.38981445 +0.91275187
From 44 observations 2021 Feb. 9-May 13, mean residual 0".3.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2021 05 26 09 15 09.8 +09 43 01 5.4926 5.2966 73.6 10.6 21.4
...
2021 06 10 09 19 50.3 +11 13 25 5.7103 5.2743 59.9 9.6 21.5
...
2021 06 18 09 23 05.4 +11 54 08 5.8157 5.2634 52.8 8.8 21.5
...
2021 06 24 09 25 49.2 +12 21 41 5.8884 5.2556 47.5 8.2 21.6
2021 06 25 09 26 17.9 +12 26 03 5.8999 5.2543 46.6 8.1 21.6
2021 06 26 09 26 46.9 +12 30 22 5.9113 5.2531 45.8 8.0 21.6
...
2021 07 02 09 29 48.2 +12 54 57 5.9757 5.2458 40.6 7.2 21.6
...
2021 07 10 09 34 07.7 +13 24 43 6.0509 5.2367 33.8 6.2 21.6
...
2021 07 25 09 42 58.2 +14 13 07 6.1551 5.2215 21.3 4.0 21.6
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-M86
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