MPEC 2021-M77 : COMET P/2021 L4 (PANSTARRS)
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M.P.E.C. 2021-M77 Issued 2021 June 23, 02:30 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 L4 (PANSTARRS)
R. Wainscoat reports the discovery of a comet in three 45 second survey
images taken by PAN-STARRS 1 (F51) on June 14 UT. He reports a condensed 0".3
coma and a straight 6" tail at position angle 120 deg. Prediscovery positions
were reported back to early June. Additional reports of cometary features are
as follows:
OC Date Reporter Coma Tail PA Exposures
568 2021-06-14 R. Weryk 0".1 8" 115 3x60s
Q62 2021-06-15 H. Sato 8" 17x60s
Observations:
PK21L040 C2021 06 02.28432 15 37 47.60 -20 15 27.9 oEM077691
PK21L040 C2021 06 02.29216 15 37 47.20 -20 15 25.1 oEM077691
PK21L040 C2021 06 02.30004 15 37 46.84 -20 15 21.6 oEM077691
PK21L040 C2021 06 09.33728 15 33 04.336-19 30 55.38 20.9 wUEM077F51
PK21L040 C2021 06 09.34827 15 33 03.923-19 30 51.66 20.6 wUEM077F51
PK21L040 C2021 06 09.35929 15 33 03.500-19 30 47.62 20.8 wUEM077F51
PK21L040 C2021 06 09.37028 15 33 03.072-19 30 43.47 20.7 wUEM077F51
PK21L040* C2021 06 14.27106715 30 11.826-19 01 27.38 21.22wUEM077F51
PK21L040 C2021 06 14.28229215 30 11.431-19 01 23.43 21.43wUEM077F51
PK21L040 C2021 06 14.29350915 30 11.074-19 01 19.57 21.36wUEM077F51
PK21L040 ^C2021 06 14.40030415 30 07.413-19 00 42.46 21.46GVEM077568
PK21L040 ^C2021 06 14.40151315 30 07.372-19 00 42.01 21.55GVEM077568
PK21L040 ^C2021 06 14.40330015 30 07.318-19 00 41.41 21.49GVEM077568
PK21L040 1C2021 06 15.51157 15 29 32.07 -18 54 17.3 VEM077Q62
PK21L040 1C2021 06 15.51959 15 29 31.79 -18 54 14.2 20.1 GVEM077Q62
PK21L040 KC2021 06 16.10274915 29 13.76 -18 50 56.2 20.4 GXEM077Y00
PK21L040 KC2021 06 16.11026015 29 13.49 -18 50 53.7 20.5 GXEM077Y00
PK21L040 KC2021 06 16.11699115 29 13.25 -18 50 51.2 20.6 GXEM077Y00
Observer details:
568 Mauna Kea. Observers R. Wainscoat, C. Cunningham, H. Flewelling.
Measurers R. Weryk, R. Wainscoat. 3.6-m Canada-France-Hawaii Telescope +
CCD.
691 Steward Observatory, Kitt Peak-Spacewatch. Observer R. A. Mastaler.
0.9-m f/3 reflector + 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.
Q62 iTelescope Observatory, Siding Spring. Observer H. Sato. 0.51-m f/6.8
astrograph + CCD + f/4.5 focal reducer.
Y00 SONEAR Observatory, Oliveira. Observers C. Jacques, E. Pimentel, J.
Barros. Measurer C. Jacques. 0.45-m f/2.9 reflector + CCD.
Orbital elements:
P/2021 L4 (PANSTARRS)
Epoch 2019 Oct. 4.0 TT = JDT 2458760.5
T 2019 Sept. 16.29777 TT Rudenko
q 2.7583157 (2000.0) P Q
n 0.17464281 Peri. 235.69625 -0.45072259 -0.85317761
a 3.1698271 Node 243.20762 +0.88473016 -0.38782852
e 0.1298214 Incl. 17.10570 +0.11875053 -0.34882230
P 5.64
From 18 observations 2021 June 2-16, mean residual 0".3.
P/2021 L4 (PANSTARRS)
Epoch 2025 May 5.0 TT = JDT 2460800.5
T 2025 Apr. 29.14203 TT Rudenko
q 2.7700352 (2000.0) P Q
n 0.17436802 Peri. 233.97993 -0.42372312 -0.86694244
a 3.1731565 Node 243.12701 +0.89651111 -0.36002689
e 0.1270411 Incl. 17.10961 +0.12933113 -0.34466134
P 5.65
From 18 observations 2021 June 2-16, mean residual 0".3.
P/2021 L4 (PANSTARRS)
Epoch 2021 July 5.0 TT = JDT 2459400.5
T 2019 Sept. 15.24355 TT Rudenko
q 2.7577894 (2000.0) P Q
n 0.17481098 Peri. 235.48450 -0.44741442 -0.85491553
a 3.1677938 Node 243.19797 +0.88623344 -0.38441929
e 0.1294290 Incl. 17.10754 +0.12004428 -0.34834070
P 5.64
From 18 observations 2021 June 2-16, mean residual 0".3.
Ephemeris:
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2021 05 24 15 44 47.5 -21 16 14 2.3275 3.3382 175.7 1.3 20.6
...
2021 06 08 15 33 55.0 -19 39 09 2.3879 3.3542 158.8 6.3 20.6
...
2021 06 16 15 29 17.0 -18 51 31 2.4451 3.3625 149.9 8.7 20.7
...
2021 06 22 15 26 31.9 -18 19 07 2.4981 3.3687 143.4 10.4 20.8
2021 06 23 15 26 08.4 -18 14 02 2.5078 3.3698 142.3 10.6 20.8
2021 06 24 15 25 45.9 -18 09 03 2.5176 3.3708 141.2 10.9 20.8
...
2021 06 30 15 23 55.8 -17 41 15 2.5808 3.3769 135.0 12.3 20.8
...
2021 07 08 15 22 35.9 -17 10 04 2.6752 3.3849 126.9 13.9 20.9
...
2021 07 23 15 23 32.0 -16 30 15 2.8765 3.3995 112.6 16.0 21.1
M. P. C. Staff (C) Copyright 2021 MPC M.P.E.C. 2021-M77
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