[Iaude] CBET 4702: COMET P/2019 X1

quai at eps.harvard.edu quai at eps.harvard.edu
Tue Dec 10 17:04:23 EST 2019


                                                  Electronic Telegram No. 4702
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/2019 X1 (PRUYNE)
     Theodore A. Pruyne, Lunar and Planetary Laboratory, University of
Arizona, reports his discovery of a comet on CCD exposures taken on Dec. 2 UT
with the Mt. Lemmon Survey's 1.5-m reflector (discovery observations tabulated
below), the comet described as showing a coma that is roughly 15" across and
a tail about 16" long in p.a. about 260 degrees.  D. Rankin obtained
confirming CCD images with the Steward Observatory 1.0-m reflector at Mt.
Lemmon on Dec. 3.3 UT, in which the comet appeared diffuse with a diameter of
about 12" and magnitude 19.4-19.9.

     2019 UT             R.A. (2000) Decl.       Mag.   Observer
     Dec.  2.36583    7 07 29.09   +32 48 29.2   19.4   Pruyne
           2.37102    7 07 28.98   +32 48 30.1   19.6     "
           2.37620    7 07 28.84   +32 48 31.0   19.3     "
           2.38138    7 07 28.71   +32 48 32.0   19.5     "

After the comet was posted on the Minor Planet Center's PCCP webpage, other
CCD astrometrists have commented on the cometary appearance.  R. Weryk,
Institute for Astronomy, University of Hawaii, notes that two 45-s w-band
exposures taken on Dec. 3.5 UT with the 1.8-m Pan-STARRS1 reflector at
Haleakala in 1".2 seeing show a very condensed coma of diameter 1".4 and a
straight tail 12" long in p.a. 265 deg.  Weryk also found a single pre-
discovery image of the comet moving over a bright star on Nov. 29.64, showing
a tail in p.a. about 270 degrees, with the magnitude measured as 19.5.
K. Sarneczky and B. Cseh, Konkoly Observatory, report that fifteen stacked
120-s unfiltered CCD images taken with the 0.60-m Schmidt telescope at
Piszkesteto, Hungary, on Dec. 4.0 show a very condensed coma 4" in diameter
and a very faint, straight tail about 10" long in p.a. 270 deg.  Twelve
stacked 120-s unfiltered exposures taken by G. Favero and R. Furgoni with a
0.80-m f/4 reflector at Castello Tesino, Italy, on Dec. 5.9 show an elongated
coma of red mag 19.0 and a faint tail about 11" long in p.a. 270 deg.
     The available astrometry appear on MPEC 2019-X103.  S. Nakano, Sumoto,
Japan, provides the following preliminary elliptical orbital elements from 73
observations spanning Nov. 29-Dec. 10 (mean residual 0".42), adding that the
orbital period is uncertain by +/- 160 days.

     T = 2019 July 22.1866 TT         Peri. =  36.7615
     e = 0.300463                     Node  =  43.9695  2000.0
     q = 4.317072 AU                  Incl. =  10.2821
       a =  6.171326 AU    n = 0.0642890    P =  15.33 years

The following ephemeris by the undersigned from the above orbital elements
used photometric power-law parameters H = 10.0 and 2.5n = 10 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2019 09 14    06 44.90   +29 46.1    4.546    4.324    71.0    12.7  19.6
2019 09 19    06 49.02   +29 52.9    4.476    4.325    74.9    13.0  19.6
2019 09 24    06 52.86   +30 00.1    4.405    4.327    79.0    13.2  19.6
2019 09 29    06 56.41   +30 07.8    4.333    4.328    83.1    13.3  19.5
2019 10 04    06 59.64   +30 16.1    4.261    4.330    87.3    13.3  19.5
2019 10 09    07 02.54   +30 25.0    4.188    4.332    91.6    13.3  19.5
2019 10 14    07 05.07   +30 34.7    4.116    4.334    95.9    13.2  19.4
2019 10 19    07 07.23   +30 45.2    4.044    4.336   100.4    13.1  19.4
2019 10 24    07 08.98   +30 56.5    3.973    4.338   104.9    12.8  19.4
2019 10 29    07 10.32   +31 08.6    3.905    4.340   109.6    12.5  19.3
2019 11 03    07 11.23   +31 21.6    3.838    4.343   114.4    12.0  19.3
2019 11 08    07 11.68   +31 35.3    3.775    4.345   119.2    11.5  19.3
2019 11 13    07 11.69   +31 49.6    3.714    4.348   124.1    10.9  19.2
2019 11 18    07 11.24   +32 04.5    3.658    4.350   129.2    10.1  19.2
2019 11 23    07 10.34   +32 19.7    3.606    4.353   134.3     9.4  19.2
2019 11 28    07 09.00   +32 35.1    3.559    4.356   139.4     8.5  19.1
2019 12 03    07 07.24   +32 50.4    3.518    4.359   144.6     7.5  19.1
2019 12 08    07 05.09   +33 05.3    3.483    4.363   149.8     6.5  19.1
2019 12 13    07 02.60   +33 19.5    3.454    4.366   154.9     5.5  19.1
2019 12 18    06 59.81   +33 32.8    3.432    4.369   159.8     4.5  19.1
2019 12 23    06 56.79   +33 44.8    3.418    4.373   164.3     3.5  19.1
2019 12 28    06 53.60   +33 55.4    3.411    4.376   167.6     2.8  19.1
2020 01 02    06 50.33   +34 04.3    3.411    4.380   168.9     2.5  19.1
2020 01 07    06 47.04   +34 11.4    3.419    4.384   167.4     2.8  19.1
2020 01 12    06 43.82   +34 16.6    3.435    4.388   163.8     3.6  19.1
2020 01 17    06 40.75   +34 20.0    3.458    4.392   159.3     4.5  19.1
2020 01 22    06 37.89   +34 21.4    3.488    4.396   154.4     5.5  19.1
2020 01 27    06 35.31   +34 21.1    3.525    4.400   149.3     6.6  19.2
2020 02 01    06 33.07   +34 19.2    3.569    4.405   144.1     7.5  19.2
2020 02 06    06 31.21   +34 15.9    3.618    4.409   138.9     8.4  19.2
2020 02 11    06 29.76   +34 11.2    3.673    4.414   133.8     9.3  19.3
2020 02 16    06 28.75   +34 05.5    3.733    4.419   128.7    10.0  19.3
2020 02 21    06 28.19   +33 58.9    3.797    4.423   123.7    10.7  19.4
2020 02 26    06 28.09   +33 51.6    3.865    4.428   118.8    11.3  19.4
2020 03 02    06 28.44   +33 43.6    3.937    4.433   114.0    11.8  19.4
2020 03 07    06 29.25   +33 35.1    4.011    4.438   109.3    12.2  19.5
2020 03 12    06 30.49   +33 26.3    4.087    4.443   104.6    12.5  19.5


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

                         (C) Copyright 2019 CBAT
2019 December 10                 (CBET 4702)              Daniel W. E. Green



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