[Iaude] COMET P/2023 W1 = P/2001 Q6

quai at eps.harvard.edu quai at eps.harvard.edu
Wed Dec 13 08:46:22 EST 2023


                                                  Electronic Telegram No. 5325
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)
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Prepared using the Tamkin Foundation Computer Network


COMET P/2023 W1 = P/2001 Q6 (NEAT)
     Hidetaka Sato (Bunkyo-ku, Tokyo, Japan) reports his recovery of comet
P/2001 Q6 (cf. IAUCs 7698, 7722, 7734, 7753) on images obtained with
telescopes at the "Deep Sky Chile" observatory at Rio Hurtado (astrometry
tabulated below).  Eight stacked 120-s CMOS exposures obtained with a 0.18-m
f/2.8 astrograph on Nov. 29.0 UT show a strongly condensed object with an
outer coma 35" in diameter and no tail; the magnitude was measured within a
circular aperture of radius 18".5.  Twelve stacked 30-s follow-up CCD
exposures taken on Nov. 30.04-30.08 with a 0.51-m f/6.8 astrograph show a
strongly condensed coma 17" in diameter with no tail; the magnitude was
measured within a circular aperture of radius 8".6.  Sixteen stacked 30-s
exposures taken with the 0.51-m astrograph on Dec. 1.1 show a moderately
condensed coma 17" in diameter and no tail; the magnitude was measured
within a circular aperture of radius 8".6.  On Dec. 3.1, sixteen stacked
30-s exposures showed a moderately condensed coma 17" in diameter with no
tail; the magnitude was 18.0 as measured within a circular aperture of
radius 8".6.

     2023 UT             R.A. (2000) Decl.       Mag.   Observer
     Nov. 29.02810   23 09 18.94   -24 07 59.8          Sato
          29.03466   23 09 18.71   -24 07 45.1   17.6     "
          30.04047   23 08 50.77   -23 29 28.0            "
          30.04261   23 08 50.71   -23 29 23.0            "
          30.07806   23 08 49.76   -23 28 02.3   18.3     "
     Dec.  1.08836   23 08 24.60   -22 49 35.1            "
           1.09271   23 08 24.52   -22 49 24.9   18.0     "

Nine additional stacked 60-s exposures taken remotely by Hidetaka Sato with a
0.51-m f/6.8 astrograph at Siding Spring, NSW, Australia, on Dec. 5.44-5.45 UT
show a strongly condensed object with an outer coma 1'.0 in diameter and no
tail; the magnitude was 17.5 as measured within a circular aperture of radius
29".5.  A delay by the Minor Planet Center in announcing the recovery led to
the comet being inadvertently posted as a supposedly new comet on the MPC's
PCCP website after the comet was found by D. Rankin (Mt. Lemmon 1.5-m
reflector) on Dec. 9.1 UT at mag 18.5 (coma diameter 10".5).  Hirohisa Sato
has measured twenty-five stacked 60-s CCD exposures taken by T. Ikemura with
a 0.38-m f/4.2 reflector at Shinshiro, Japan, on Dec. 10.44-10.46 that show a
condensed coma about 7" in diameter (total mag 18.3) with no tail.  The
available astrometry appears on MPEC 2023-X258.
     The residuals of Sato's recovery observations are -0.02 deg in R.A. and
+1.22 deg in Decl. from the prediction in NK 869 (and the ICQ's 2023 Comet
Handbook), with a corresponding correction of Delta(T) = -2.7 days.  The
following linked orbital elements by S. Nakano (Central Bureau) are from 393
observations spanning 2001-2023 (mean residual 0".6).  The comet passed 0.72
AU from Jupiter on 1957 Nov. 3 UT.

                    Epoch = 2001 Nov. 27.0 TT
     T = 2001 Nov.  9.46803 TT        Peri. =  43.33085
     e = 0.8238140                    Node  =  22.13540 2000.0
     q = 1.4081706 AU                 Incl. =  56.85456
       a =  7.9925205 AU   n = 0.04361927   P =  22.60 years

                    Epoch = 2024 Feb. 20.0 TT
     T = 2024 Feb. 26.24346 TT        Peri. =  42.91763
     e = 0.8236492                    Node  =  22.18500 2000.0
     q = 1.4057875 AU                 Incl. =  56.90844
       a =  7.9715387 AU   n = 0.04379160   P =  22.51 years

                    Epoch = 2046 Aug.  3.0 TT
     T = 2046 July 22.93079 TT        Peri. =  42.68258
     e = 0.8234539                    Node  =  22.10244 2000.0
     q = 1.4125491 AU                 Incl. =  56.83395
       a =  8.0010218 AU   n = 0.04354977   P =  22.63 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 12.0 and 2.5n = 20 for the
magnitudes (which is some 3 mag fainter than at its 2001 apparition).

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2023 10 23    00 07.05   -44 44.3    1.435    2.112   119.7    24.2  19.3
2023 11 02    23 42.98   -40 11.6    1.417    2.028   113.5    26.7  18.9
2023 11 12    23 25.29   -34 39.8    1.422    1.945   106.1    29.3  18.5
2023 11 22    23 13.95   -28 33.9    1.448    1.865    98.1    31.6  18.2
2023 12 02    23 08.07   -22 15.0    1.490    1.788    90.1    33.5  17.9
2023 12 12    23 06.59   -15 56.1    1.542    1.715    82.3    34.7  17.6
2023 12 22    23 08.61   -09 44.0    1.601    1.646    74.9    35.2  17.4
2024 01 01    23 13.37   -03 40.7    1.661    1.585    68.1    35.2  17.1
2024 01 11    23 20.38   +02 14.6    1.720    1.530    62.0    34.6  16.9
2024 01 21    23 29.32   +08 04.2    1.775    1.484    56.7    33.7  16.7
2024 01 31    23 40.01   +13 50.6    1.822    1.447    52.3    32.6  16.5
2024 02 10    23 52.46   +19 36.5    1.862    1.422    48.8    31.5  16.4
2024 02 20    00 06.86   +25 24.2    1.894    1.408    46.4    30.6  16.4
2024 03 01    00 23.56   +31 14.6    1.919    1.407    45.0    29.9  16.4
2024 03 11    00 43.23   +37 07.8    1.939    1.417    44.7    29.5  16.5
2024 03 21    01 06.86   +43 01.5    1.956    1.440    45.2    29.4  16.6
2024 03 31    01 35.97   +48 49.2    1.974    1.474    46.3    29.4  16.8
2024 04 10    02 12.81   +54 19.5    1.996    1.517    47.8    29.3  17.1
2024 04 20    03 00.25   +59 12.4    2.026    1.570    49.4    29.1  17.5
2024 04 30    04 00.79   +62 58.0    2.068    1.630    50.8    28.6  17.8
2024 05 10    05 13.35   +65 01.4    2.124    1.697    51.8    27.9  18.2
2024 05 20    06 29.87   +65 00.5    2.196    1.769    52.3    26.9  18.7
2024 05 30    07 39.27   +63 05.7    2.283    1.845    52.2    25.7  19.1
2024 06 09    08 35.94   +59 52.2    2.386    1.924    51.4    24.4  19.6
2024 06 19    09 20.49   +55 57.0    2.502    2.007    50.0    22.8  20.0


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

                         (C) Copyright 2023 CBAT
2023 December 13                 (CBET 5325)              Daniel W. E. Green



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