[Iaude] CBET 4773: COMET P/2020 G1
quai at eps.harvard.edu
quai at eps.harvard.edu
Wed May 13 01:37:35 EDT 2020
Electronic Telegram No. 4773
Central Bureau for Astronomical Telegrams
Mailing address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
COMET P/2020 G1 (PIMENTEL)
Further to 4759, additional CCD astrometry has been reported that is yet
unpublished and is tabulated below. K. Kadota, Ageo, Japan, has reported
observations made with a 0.25-m f/5 reflector. Observations were made with a
0.34-m f/5 reflector at Perth by P. Camilleri, J. Oey, and R. Groom (and
measured and reported by Camilleri); Oey, Camilleri, and H. Williams also
obtained images with a 0.34-m f/5.9 Schmidt-Cassegrain reflector at the Blue
Mountains Observatory, Leura, NSW, Australia that were measured by Camilleri.
H. Sato, Tokyo, Japan, obtained images remotely on May 3.1 UT with a 0.43-m
astrograph near Mayhill, NM, USA, that showed a strongly condensed coma 18"
in diameter with a 20" tail toward p.a. 100 degrees; the magnitude was
measured within a circular aperture of radius 9".6. Sato also obtained
images remotely on May 11.35 with a 0.51-m astrograph at Siding Spring, NSW,
that showed a strongly condensed coma 25" in diameter with a faint, broad
tail 20" long toward p.a. 90 degrees and a straight anti-tail 1'.0 long
toward p.a. 305 degrees; the magnitude was measured within a circular
aperture of radius 13".1. T. Lovejoy, Birkdale, Qld., Australia, obtained
images with a 0.36-m f/1.9 Schmidt-Cassegrain reflector on May 8 and 11.
2020 UT R.A. (2000) Decl. Mag. Observer
Apr. 30.44547 7 14 55.88 - 1 50 35.4 15.9 Kadota
30.44744 7 14 56.83 - 1 50 36.2 "
May 1.47354 7 23 32.56 - 2 03 38.3 17.0 Camilleri
1.47507 7 23 33.36 - 2 03 39.7 16.6 "
1.47660 7 23 34.04 - 2 03 41.7 17.3 "
1.48833 7 23 39.83 - 2 03 50.1 17.0 "
1.48987 7 23 40.65 - 2 03 51.5 16.9 "
1.49141 7 23 41.39 - 2 03 52.4 17.3 "
2.52084 7 32 09.99 - 2 16 50.1 17.0 "
2.52392 7 32 11.50 - 2 16 52.5 16.9 "
2.52697 7 32 12.98 - 2 16 54.5 17.1 "
3.12826 7 37 05.95 - 2 24 31.9 Sato
3.13068 7 37 07.14 - 2 24 34.2 "
3.13311 7 37 08.27 - 2 24 35.7 "
3.13554 7 37 09.48 - 2 24 37.5 16.5 "
3.42157 7 39 27.64 - 2 27 51.0 16.9 Oey
3.42829 7 39 30.83 - 2 27 55.8 17.1 "
3.43517 7 39 34.17 - 2 28 00.8 17.3 "
3.44207 7 39 37.43 - 2 28 05.3 17.5 "
3.44896 7 39 40.76 - 2 28 10.5 17.0 "
3.45403 7 39 43.19 - 2 28 14.6 17.2 "
6.35280 8 02 19.95 - 3 01 39.7 17.2 "
6.36031 8 02 23.26 - 3 01 44.5 17.0 "
6.36753 8 02 26.58 - 3 01 49.0 17.3 "
7.41656 8 10 16.69 - 3 13 07.9 17.3 "
7.44713 8 10 30.23 - 3 13 27.7 17.6 "
7.45309 8 10 32.80 - 3 13 31.8 17.9 "
7.47754 8 10 43.63 - 3 13 46.5 17.2 "
8.37815 8 17 18.06 - 3 23 10.7 17.2 Lovejoy
8.38023 8 17 18.96 - 3 23 11.7 17.1 "
8.38231 8 17 19.74 - 3 23 12.5 17.4 "
8.38535 8 17 21.15 - 3 23 13.7 17.4 Oey
8.41388 8 17 33.36 - 3 23 30.5 17.5 "
8.44241 8 17 45.61 - 3 23 48.8 17.1 "
8.52781 8 18 22.67 - 3 24 41.6 17.0 Camilleri
8.53388 8 18 25.37 - 3 24 45.5 17.2 "
8.53998 8 18 27.83 - 3 24 48.7 17.2 "
9.37220 8 24 23.36 - 3 33 10.2 17.3 Oey
9.37579 8 24 24.81 - 3 33 11.6 17.6 "
9.37906 8 24 26.15 - 3 33 13.5 17.6 "
9.46096 8 25 01.08 - 3 34 04.2 17.2 Camilleri
9.46403 8 25 02.20 - 3 34 04.9 17.1 "
9.46710 8 25 03.60 - 3 34 07.0 17.2 "
9.47009 8 25 04.82 - 3 34 08.5 17.1 "
9.47307 8 25 05.98 - 3 34 09.6 17.2 "
9.47607 8 25 07.26 - 3 34 12.3 17.0 "
11.34799 8 37 58.20 - 3 52 03.7 Sato
11.35008 8 37 59.02 - 3 52 04.7 "
11.35214 8 37 59.82 - 3 52 05.8 16.4 "
11.39519 8 38 16.74 - 3 52 29.5 17.3 Lovejoy
11.39745 8 38 17.73 - 3 52 30.6 17.5 "
11.39971 8 38 18.49 - 3 52 31.1 17.6 "
11.40196 8 38 19.54 - 3 52 33.0 17.3 "
11.46476 8 38 44.94 - 3 53 07.7 17.1 Camilleri
11.48402 8 38 52.56 - 3 53 17.2 17.6 "
11.51226 8 39 03.83 - 3 53 33.3 18.0 "
11.51610 8 39 05.38 - 3 53 35.4 17.2 "
The following revised elliptical orbital elements by S. Nakano, Sumoto,
Japan, are from 258 observations spanning 2020 Apr. 13-May 11 (mean residual
0".72). From these elements, which are still weak for looking at previous
or future returns to perihelion, there are no close approaches to major
planets (< 1.0 AU) found between 1980 and 2050, and no other identifications
were made with archival astrometry.
Epoch = 2006 Aug. 13.0 TT
T = 2006 Aug. 22.7315 TT Peri. = 207.1879
e = 0.859704 Node = 240.2381 2000.0
q = 0.501531 AU Incl. = 18.6474
a = 3.574815 AU n = 0.1458222 P = 6.76 years
Epoch = 2013 May 28.0 TT
T = 2013 June 3.4793 TT Peri. = 207.3933
e = 0.858933 Node = 240.2487 2000.0
q = 0.505375 AU Incl. = 18.5404
a = 3.582520 AU n = 0.1453521 P = 6.78 years
Epoch = 2020 Mar. 12.0 TT
T = 2020 Mar. 17.3938 TT Peri. = 207.5909
e = 0.858980 Node = 240.1264 2000.0
q = 0.505576 AU Incl. = 18.4657
a = 3.585129 AU n = 0.1451934 P = 6.79 years
Epoch = 2026 Dec. 26.0 TT
T = 2026 Dec. 26.9500 TT Peri. = 207.5878
e = 0.859782 Node = 240.1299 2000.0
q = 0.501633 AU Incl. = 18.4971
a = 3.577517 AU n = 0.1456570 P = 6.77 years
The following ephemeris by the undersigned from the above elliptical
elements by Nakano uses photometric power-law parameters H = 17.0 and 2.5n =
10 for the magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2020 02 01 22 01.87 -01 59.9 1.884 1.044 22.5 21.2 18.6
2020 02 06 22 18.39 -01 09.0 1.816 0.968 21.4 21.9 18.2
2020 02 11 22 36.19 -00 13.9 1.744 0.892 20.7 23.0 17.7
2020 02 16 22 55.47 +00 44.8 1.669 0.816 20.2 24.6 17.2
2020 02 21 23 16.41 +01 45.8 1.590 0.742 20.0 27.1 16.7
2020 02 26 23 39.22 +02 47.2 1.506 0.672 20.3 30.7 16.2
2020 03 02 00 04.06 +03 45.8 1.418 0.608 21.0 35.8 15.6
2020 03 07 00 30.99 +04 37.3 1.326 0.556 22.4 42.8 15.1
2020 03 12 00 59.87 +05 15.9 1.228 0.520 24.2 51.7 14.6
2020 03 17 01 30.38 +05 36.4 1.128 0.506 26.6 61.9 14.3
2020 03 22 02 02.12 +05 36.2 1.028 0.516 29.5 71.8 14.2
2020 03 27 02 35.01 +05 16.0 0.933 0.549 32.8 80.1 14.2
2020 04 01 03 09.45 +04 39.0 0.848 0.599 36.7 85.5 14.4
2020 04 06 03 46.07 +03 48.5 0.775 0.661 41.3 87.9 14.7
2020 04 11 04 25.44 +02 47.1 0.717 0.731 46.8 87.6 14.9
2020 04 16 05 07.58 +01 37.8 0.677 0.804 52.9 84.8 15.2
2020 04 21 05 51.76 +00 24.1 0.656 0.880 59.6 80.3 15.5
2020 04 26 06 36.41 -00 49.3 0.654 0.956 66.4 74.8 15.9
2020 05 01 07 19.59 -01 57.7 0.672 1.032 72.7 68.8 16.3
2020 05 06 07 59.65 -02 57.9 0.708 1.107 78.2 63.1 16.7
2020 05 11 08 35.62 -03 48.9 0.759 1.182 82.5 57.9 17.1
2020 05 16 09 07.29 -04 31.7 0.824 1.255 85.7 53.4 17.6
2020 05 21 09 34.92 -05 08.1 0.898 1.327 87.8 49.6 18.0
2020 05 26 09 59.03 -05 40.1 0.981 1.398 89.0 46.4 18.4
2020 05 31 10 20.18 -06 09.1 1.071 1.468 89.5 43.7 18.8
2020 06 05 10 38.88 -06 36.4 1.166 1.537 89.3 41.3 19.2
2020 06 10 10 55.58 -07 02.7 1.266 1.604 88.7 39.2 19.6
2020 06 15 11 10.65 -07 28.5 1.369 1.670 87.6 37.4 19.9
2020 06 20 11 24.41 -07 54.3 1.476 1.735 86.2 35.8 20.2
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2020 CBAT
2020 May 13 (CBET 4773) Daniel W. E. Green
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