[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unpublished and is tabulated below.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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