[Iaude] CBET 5328: COMET P/2023 Y1

quai at eps.harvard.edu quai at eps.harvard.edu
Wed Dec 20 00:25:25 EST 2023


                                                  Electronic Telegram No. 5328
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/2023 Y1 (GIBBS)
     A. R. Gibbs reports his discovery of another comet on 30-s CCD exposures
obtained on Dec. 17 with the Mt. Lemmon Survey's 1.5-m reflector (discovery
observations tabulated below); in great seeing conditions, there was a
compact coma 5" across with a tail in p.a. 285 degrees that was involved with
a field star.  Four follow-up 80-s exposures taken shortly thereafter show a
condensed coma 6" across with a straight, narrow, 25" tail in p.a. 290 deg.

     2023 UT             R.A. (2000) Decl.       Mag.   Observer
     Dec. 17.50149   11 15 19.51   +12 09 13.9          Gibbs
          17.50665   11 15 19.91   +12 09 13.0   20.4     "
          17.51181   11 15 20.38   +12 09 12.2   20.7     "
          17.53335   11 15 22.00   +12 09 07.2   20.1     "
          17.53434   11 15 22.00   +12 09 06.9            "
          17.53533   11 15 22.10   +12 09 07.0            "
          17.53633   11 15 22.20   +12 09 06.6            "

After the comet was posted on the Minor Planet Center's PCCP webpage, R.
Weryk (Department of Physics and Astronomy, University of Western Ontario)
noted that four 45-s w-band survey images obtained in roughly 1".6 seeing on
Dec. 17.6 UT with the Pan-STARRS2 1.8-m Ritchey-Chretien reflector at
Haleakala show a diffuse coma of size 2".0 (full-width-at-half-maximum) with
a 5" tail in p.a. 290 degrees.  Pre-discovery apparently asteoridal
Pan-STARRS2 images were also found on Nov. 24.6 (mag 21.5-22.0).
     The available astrometry appears on MPEC 2023-Y60.  The following
elliptical orbital elements by S. Nakano (Central Bureau) are from 23
observations spanning 2023 Nov. 24-Dec. 19 (mean residual 0".4), with some
concern about the lone Nov. 24 observations.  There appear to be no close
approaches to major planets.

     T = 2023 Nov. 29.09424 TT        Peri. =  51.47507
     e = 0.4173682                    Node  =  78.33322 2000.0
     q = 2.0650734 AU                 Incl. =   6.34463
       a =  3.5443883 AU   n = 0.14770396   P =   6.67 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 16.0 and 2.5n = 10 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2023 12 02    10 52.81   +13 20.1    1.818    2.065    89.8    28.5  20.4
2023 12 12    11 07.83   +12 31.0    1.715    2.067    96.2    28.3  20.3
2023 12 22    11 21.00   +11 54.7    1.615    2.073   103.1    27.5  20.2
2024 01 01    11 32.01   +11 33.6    1.521    2.081   110.5    26.3  20.1
2024 01 11    11 40.49   +11 30.0    1.434    2.091   118.6    24.4  20.0
2024 01 21    11 46.07   +11 45.1    1.357    2.105   127.4    21.8  19.9
2024 01 31    11 48.51   +12 17.7    1.293    2.121   136.8    18.5  19.8
2024 02 10    11 47.73   +13 04.9    1.244    2.140   146.9    14.6  19.8
2024 02 20    11 44.00   +14 00.0    1.216    2.161   157.0    10.3  19.8
2024 03 01    11 38.07   +14 54.1    1.210    2.184   165.8     6.4  19.8
2024 03 11    11 31.00   +15 37.8    1.228    2.209   168.0     5.4  19.9
2024 03 21    11 24.10   +16 03.5    1.270    2.236   161.2     8.2  20.0
2024 03 31    11 18.56   +16 07.1    1.336    2.265   151.7    12.1  20.2
2024 04 10    11 15.13   +15 48.6    1.422    2.296   142.0    15.6  20.4
2024 04 20    11 14.24   +15 09.9    1.527    2.329   132.7    18.5  20.6
2024 04 30    11 15.87   +14 14.6    1.647    2.362   124.0    20.7  20.8
2024 05 10    11 19.82   +13 06.0    1.778    2.397   115.8    22.3  21.0


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2023 CBAT
2023 December 20                 (CBET 5328)              Daniel W. E. Green



More information about the Iaude mailing list