MPEC 2021-A209 : COMET P/2021 A5 (PANSTARRS)
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M.P.E.C. 2021-A209 Issued 2021 January 15, 19:30 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 P/2021 A5 (PANSTARRS)
R. Weryk reports the discovery of a comet in three w-band 45-second images
obtained by Pan-STARRS 1 (F51) survey on Jan. 6 UT. He reports a 0".8 condensed
coma and 4" straight tail in position angle 80 deg. Catalina Sky Survey
subsequently reported prediscovery astrometry from Dec. 2020. Additional
reports of cometary features are as follows:
OC Date Reporter Coma Tail PA Exposures
568 2021-01-11 R. Wainscoat 1" 4" 70
568 2021-01-15 R. Wainscoat 0".35 6" 70 3x60s
Observations:
PK21A050 C2020 12 16.12255 00 23 41.12 +25 50 39.2 21.9 GVEA209G96
PK21A050 C2020 12 16.13838 00 23 41.61 +25 50 36.7 21.0 GVEA209G96
PK21A050* C2021 01 06.29804100 41 18.229+25 42 09.19 21.24wUEA209F51
PK21A050 C2021 01 06.30840600 41 18.858+25 42 09.48 21.47wUEA209F51
PK21A050 C2021 01 06.31874700 41 19.484+25 42 10.11 21.33wUEA209F51
PK21A050 |C2021 01 07.03520 00 42 04.58 +25 42 59.0 21.3 GVEA209807
PK21A050 |C2021 01 07.03834 00 42 04.76 +25 42 58.6 21.2 GVEA209807
PK21A050 |C2021 01 07.04138 00 42 04.96 +25 42 59.0 21.3 GVEA209807
PK21A050 KC2021 01 07.18036 00 42 13.77 +25 43 04.9 21.1 RoEA209691
PK21A050 KC2021 01 07.19286 00 42 14.53 +25 43 06.0 20.8 RoEA209691
PK21A050 KC2021 01 07.20536 00 42 15.35 +25 43 07.2 20.5 RoEA209691
PK21A050 |C2021 01 08.06596 00 43 10.56 +25 44 08.0 VEA209H06
PK21A050 |C2021 01 08.07468 00 43 11.16 +25 44 08.6 21.0 GVEA209H06
PK21A050 C2021 01 08.08725 00 43 11.75 +25 44 09.7 21.8 GVEA209G96
PK21A050 C2021 01 08.09885 00 43 12.47 +25 44 10.0 22.2 GVEA209G96
PK21A050 C2021 01 09.08861 00 44 16.66 +25 45 28.2 oEA209711
PK21A050 C2021 01 09.09314 00 44 16.92 +25 45 28.2 oEA209711
PK21A050 C2021 01 09.10191 00 44 17.53 +25 45 29.1 oEA209711
PK21A050 KC2021 01 10.62590 00 45 58.37 +25 47 40.6 20.4 rVEA209N51
PK21A050 KC2021 01 10.62960 00 45 58.61 +25 47 40.9 20.4 rVEA209N51
PK21A050 KC2021 01 10.63329 00 45 58.87 +25 47 41.3 20.1 rVEA209N51
PK21A050 KC2021 01 10.63884 00 45 59.22 +25 47 41.8 20.0 rVEA209N51
PK21A050 KC2021 01 10.64254 00 45 59.46 +25 47 42.2 20.0 rVEA209N51
PK21A050 KC2021 01 10.64620 00 45 59.70 +25 47 42.4 20.1 rVEA209N51
PK21A050 KC2021 01 10.64987 00 45 59.95 +25 47 42.7 20.1 rVEA209N51
PK21A050 ^C2021 01 11.24743900 46 40.097+25 48 40.19 21.64GVEA209568
PK21A050 ^C2021 01 11.24899500 46 40.186+25 48 40.31 21.72GVEA209568
PK21A050 ^C2021 01 11.25041000 46 40.287+25 48 40.42 21.65GVEA209568
PK21A050 ^C2021 01 11.25180300 46 40.365+25 48 40.52 21.72GVEA209568
PK21A050 ^C2021 01 11.25302500 46 40.452+25 48 40.76 21.71GVEA209568
PK21A050 ^C2021 01 11.25424500 46 40.531+25 48 40.78 21.70GVEA209568
PK21A050 KC2021 01 11.78425 00 47 16.55 +25 49 31.8 21.6 GVEA209587
PK21A050 KC2021 01 11.78553 00 47 16.64 +25 49 32.7 21.3 GVEA209587
PK21A050 KC2021 01 12.01935 00 47 32.70 +25 49 56.4 20.6 GVEA209H36
PK21A050 KC2021 01 12.03712 00 47 33.83 +25 49 58.5 21.2 GVEA209H36
PK21A050 KC2021 01 12.05511 00 47 35.06 +25 50 00.7 21.3 GVEA209H36
PK21A050 KC2021 01 12.08387500 47 37.01 +25 50 03.7 20.7 VqEA209858
PK21A050 KC2021 01 12.09808400 47 37.91 +25 50 04.5 21.0 VqEA209858
PK21A050 HC2021 01 12.10838 00 47 38.67 +25 50 06.9 21.7 RoEA209691
PK21A050 HC2021 01 12.11894 00 47 39.41 +25 50 07.7 20.8 RoEA209691
PK21A050 ^C2021 01 15.21866300 51 15.968+25 56 01.12 21.64GVEA209568
PK21A050 ^C2021 01 15.21987400 51 16.041+25 56 01.26 21.82GVEA209568
PK21A050 ^C2021 01 15.22108700 51 16.155+25 56 01.40 21.61GVEA209568
Observer details:
568 Mauna Kea. Observers R. Wainscoat, L. Wells, T. Burdullis, C. Crowder, C.
Wipper. Measurers R. Weryk, R. Wainscoat. 3.6-m Canada-France-Hawaii
Telescope + CCD.
587 Sormano. Observers A. Carcano, E. Colzani. Measurer P. Sicoli. 0.5-m
f/6.8 reflector + CCD.
691 Steward Observatory, Kitt Peak-Spacewatch. Observers M. J. Brucker, M. T.
Read. 0.9-m f/3 reflector + CCD.
711 McDonald Observatory, Fort Davis. Observers J. G. Ries, B. P. Roman.
Measurer J. G. Ries. 2.1-m reflector + CCD + focal reducer.
807 Cerro Tololo Observatory, La Serena. Observers T. Linder, R. Holmes.
1.00-m f/10.0 astrograph + CCD.
858 Tebbutt Observatory, Edgewood. Observer F. B. Zoltowski. 0.51-m Schmidt-
Cassegrain + 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. Observers T. A. Pruyne, K. W. Wierzchos. Measurers E.
J. Christensen, B. Gray, D. Rankin, F. C. Shelly. 1.5-m reflector + 10K
CCD.
H06 iTelescope Observatory, Mayhill. Observer H. Sato. 0.43-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
H36 Sandlot Observatory, Scranton. Observer G. Hug. 0.56-m reflector + CCD.
N51 GROWTH India Telescope, IAO, Hanle. Observers K. Sharma, H. Kumar, U.
Stanzin, V. Bhalerao, G. C. Anupama, S. Barway. Measurers K. Sharma, B.
T. Bolin. 0.70-m f/6.5 Corrected Dall-Kirkham + CCD.
Orbital elements:
P/2021 A5 (PANSTARRS)
Epoch 2020 Nov. 7.0 TT = JDT 2459160.5
T 2020 Nov. 11.25451 TT Rudenko
q 2.6205942 (2000.0) P Q
n 0.18545643 Peri. 61.03946 +0.84502558 -0.50964635
a 3.0453797 Node 328.76904 +0.31315112 +0.71699188
e 0.1394852 Incl. 18.18817 +0.43343759 +0.47558726
P 5.31
From 43 observations 2020 Dec. 16-2021 Jan. 15, mean residual 0".5.
P/2021 A5 (PANSTARRS)
Epoch 2026 Mar. 21.0 TT = JDT 2461120.5
T 2026 Mar. 11.50920 TT Rudenko
q 2.6202900 (2000.0) P Q
n 0.18544600 Peri. 61.67833 +0.83961166 -0.51846348
a 3.0454939 Node 328.73013 +0.32061405 +0.71378469
e 0.1396174 Incl. 18.18703 +0.43847336 +0.47085776
P 5.31
From 43 observations 2020 Dec. 16-2021 Jan. 15, mean residual 0".5.
P/2021 A5 (PANSTARRS)
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5
T 2020 Nov. 11.28412 TT Rudenko
q 2.6205967 (2000.0) P Q
n 0.18545196 Peri. 61.04704 +0.84496047 -0.50975400
a 3.0454286 Node 328.76876 +0.31324260 +0.71695291
e 0.1394982 Incl. 18.18813 +0.43349843 +0.47553064
P 5.31
From 43 observations 2020 Dec. 16-2021 Jan. 15, mean residual 0".5.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2020 12 16 00 23 36.7 +25 50 53 2.1146 2.6242 110.3 20.6 20.8
...
2020 12 31 00 35 06.7 +25 38 19 2.2963 2.6280 98.5 21.7 21.0
...
2021 01 08 00 43 06.2 +25 44 03 2.3971 2.6305 92.5 21.9 21.1
...
2021 01 14 00 49 49.8 +25 53 34 2.4735 2.6327 88.2 21.9 21.2
2021 01 15 00 51 00.5 +25 55 34 2.4863 2.6331 87.5 21.9 21.2
2021 01 16 00 52 12.1 +25 57 41 2.4990 2.6335 86.8 21.9 21.2
...
2021 01 22 00 59 40.4 +26 12 38 2.5755 2.6359 82.6 21.7 21.3
...
2021 01 30 01 10 24.1 +26 38 03 2.6766 2.6395 77.2 21.3 21.4
...
2021 02 14 01 32 34.2 +27 39 17 2.8615 2.6471 67.6 20.2 21.5
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-A209
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