[Iaude] CBET 5309: COMET C/2023 T3

[quai at eps.harvard.edu]

                                                  Electronic Telegram No. 5309
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 C/2023 T3 (FULS)
     David Carson Fuls, Lunar and Planetary Laboratory, University of Arizona,
reports his discovery of a new comet on CCD images obtained on Oct. 15 with
the Mt. Lemmon Survey 1.5-m reflector (discovery observations tabulated
below), the comet noted as having a very compact coma of size 6".2 with a
possible tail in p.a. 255 degrees.

     2023 UT             R.A. (2000) Decl.       Mag.   Observer
     Oct. 15.47208    8 09 17.09   - 0 42 19.0   18.5   Fuls
          15.47675    8 09 17.25   - 0 42 20.2   18.9     "
          15.48141    8 09 17.35   - 0 42 21.4   18.8     "
          15.48609    8 09 17.52   - 0 42 23.8   19.3     "

After the comet was posted at the Minor Planet Center's PCCP webpage, H. Sato
(Bunkyo-ku, Tokyo, Japan) noted that eight stacked 120-s CCD exposures taken
on Oct. 16.51 UT with a 0.51-m f/6.8 astrograph located at the Utah Desert
Remote Observatory (near Beryl Junction, UT, USA) show only a stellar
appearance; the magnitude was 19.3 as measured within a circular aperture of
radius 4".9.
     The astrometry appears on MPEC 2023-U290.  The following parabolic
orbital elements by S. Nakano (Central Bureau) are from 39 observations
spanning 2023 Oct. 15-25 (mean residual 0".5).

     T = 2025 Jan. 26.68295 TT        Peri. = 306.22099
                                      Node  = 245.82531 2000.0
     q = 3.3746190 AU                 Incl. =  27.18353

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 9.5 and 2.5n = 8 for the magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2023 10 23    08 12.39   -01 32.2    5.339    5.323    83.7    10.7  18.9
2023 11 02    08 15.67   -02 39.7    5.131    5.259    91.9    10.9  18.8
2023 11 12    08 17.90   -03 47.7    4.926    5.196   100.3    10.8  18.7
2023 11 22    08 18.96   -04 54.7    4.727    5.133   108.9    10.5  18.6
2023 12 02    08 18.79   -05 58.9    4.539    5.070   117.5     9.9  18.4
2023 12 12    08 17.36   -06 58.5    4.365    5.008   126.0     9.2  18.3
2023 12 22    08 14.72   -07 51.1    4.209    4.946   134.2     8.2  18.2
2024 01 01    08 10.99   -08 34.8    4.075    4.884   141.6     7.2  18.1
2024 01 11    08 06.40   -09 07.4    3.966    4.823   147.4     6.3  18.0
2024 01 21    08 01.28   -09 27.6    3.883    4.763   150.3     5.9  17.9
2024 01 31    07 56.03   -09 34.9    3.827    4.703   149.6     6.1  17.8
2024 02 10    07 51.08   -09 29.7    3.798    4.644   145.4     6.9  17.7
2024 02 20    07 46.83   -09 13.5    3.794    4.585   138.9     8.2  17.7
2024 03 01    07 43.66   -08 48.5    3.813    4.527   131.2     9.5  17.7
2024 03 11    07 41.82   -08 17.6    3.850    4.470   123.0    10.7  17.6
2024 03 21    07 41.48   -07 43.6    3.903    4.413   114.7    11.8  17.6
2024 03 31    07 42.70   -07 09.2    3.968    4.357   106.4    12.7  17.6
2024 04 10    07 45.47   -06 36.9    4.040    4.302    98.4    13.3  17.6
2024 04 20    07 49.74   -06 08.6    4.116    4.248    90.7    13.7  17.6
2024 04 30    07 55.39   -05 45.9    4.193    4.195    83.2    13.8  17.6
2024 05 10    08 02.32   -05 29.9    4.268    4.143    76.1    13.7  17.6


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

                         (C) Copyright 2023 CBAT
2023 October 30                  (CBET 5309)              Daniel W. E. Green