[Iaude] CBET 4829: COMET P/2020 P2

quai at eps.harvard.edu quai at eps.harvard.edu
Sat Aug 15 20:47:06 EDT 2020


                                                  Electronic Telegram No. 4829
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 P2 = P/2009 Q4 (BOATTINI)
     N. Erasmus, South African Astronomical Observatory, reported his
discovery of a comet on CCD images taken with a 0.5-m f/2 Schmidt reflector
at Mauna Loa, Hawaii, in the in the course of the "Asteroid Terrestrial-Impact
Last Alert System" (ATLAS) search program (discovery observations tabulated
below), the object noted as having a diffuse coma (FWHM size being 6" in 4"
seeing) extended about 15" toward p.a. 260 degrees.

     2020 UT             R.A. (2000) Decl.       Mag.
     Aug. 11.58229    2 20 02.99   + 0 40 38.6   19.1
          11.59290    2 20 04.05   + 0 40 39.4   18.4
          11.59844    2 20 04.62   + 0 40 39.4   19.0
          11.60351    2 20 05.09   + 0 40 38.7   18.9

The object was immediately posted on the Minor Planet Center's page.  H. Sato,
Tokyo, Japan, noted that this appears to be a recovery of P/2009 Q4 (cf. IAUCs
9069, 9081) when he sent his follow-up observations composed of twenty stacked
60-s exposures taken remotely on Aug. 12.43 UT with a 0.43-m f/6.8 astrograph
located near Mayhill, NM, USA.  Sato found that the comet was strongly
condensed with a coma 10" in diameter, and there was a 15" tail toward p.a.
270 degrees; the magnitude was 19.3 as measured within a circular aperture of
radius 5".7.  The following day, A. Fitzsimmons, Queen's University, Belfast,
also reported that the ATLAS team found that this comet is located about 10'
from the predicted position of P/2009 Q4 with a similar motion.  E. Guido,
Castellammare di Stabia, Italy, writes that ninety-five stacked unfiltered
60-s CCD exposures taken remotely by A. Catapano and himself on Aug. 13.0-13.1
UT with a 0.5 m f/8 Ritchey-Chretien reflector at the Osservatorio Salvatore
di Giacomo, Agerola, show a compact coma about 8" in diameter and a tail 20"
long in p.a. 245 degrees.
     The MPC has already posted the new astrometry.  The following linked
orbital elements by S. Nakano, Central Bureau, are from 768 observations
spanning 2009-2020 (mean residual 0".60), the comet having been missed at its
2015 return.  The residuals of the recovery observations in 2020 were +0.12
deg in R.A. and +0.04 deg in Decl., compared to the orbit prediction in the
ICQ's 2019 and 2020 Comet Handbooks (and NK 3440), with the indicated
correction being Delta(T) = -0.22 day.  The comet passed 0.55 AU from Jupiter
on 1984 June 23 UT.

                    Epoch = 2009 Nov. 25.0 TT
     T = 2009 Nov. 19.92133 TT        Peri. = 320.01098
     e = 0.5791747                    Node  = 127.67287 2000.0
     q = 1.3208688 AU                 Incl. =  10.96921
       a =  3.1387580 AU   n = 0.17724228   P =   5.56 years

                    Epoch = 2015 June 27.0 TT
     T = 2015 June 13.27195 TT        Peri. = 320.13194
     e = 0.5800050                    Node  = 127.59773 2000.0
     q = 1.3169827 AU                 Incl. =  10.98072
       a =  3.1357107 AU   n = 0.17750071   P =   5.55 years

                    Epoch = 2020 Dec. 17.0 TT
     T = 2020 Dec. 26.74681 TT        Peri. = 320.23588
     e = 0.5825923                    Node  = 127.46365 2000.0
     q = 1.3056815 AU                 Incl. =  11.01535
       a =  3.1280725 AU   n = 0.17815124   P =   5.53 years

                    Epoch = 2026 July 19.0 TT
     T = 2026 July  7.95357 TT        Peri. = 320.30555
     e = 0.5837837                    Node  = 127.40757 2000.0
     q = 1.3000663 AU                 Incl. =  11.02844
       a =  3.1235353 AU   n = 0.17853956   P =   5.52 years

                    Epoch = 2032 Jan.  9.0 TT
     T = 2032 Jan. 11.82981 TT        Peri. = 320.21446
     e = 0.5840355                    Node  = 127.40365 2000.0
     q = 1.2992853 AU                 Incl. =  11.03008
       a =  3.1235487 AU   n = 0.17853841   P =   5.52 years

                    Epoch = 2037 July  1.0 TT
     T = 2037 July 17.15764 TT        Peri. = 320.23432
     e = 0.5852576                    Node  = 127.36964 2000.0
     q = 1.2934755 AU                 Incl. =  11.04240
       a =  3.1187444 AU   n = 0.17895111   P =   5.51 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 15.0 and 2.5n = 10 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2020 07 10    01 26.37   -00 13.0    1.967    2.184    88.1    27.7  19.9
2020 07 20    01 42.76   +00 18.7    1.793    2.114    93.5    28.7  19.5
2020 07 30    01 59.24   +00 37.8    1.624    2.044    98.9    29.4  19.2
2020 08 09    02 15.78   +00 42.2    1.463    1.975   104.3    29.8  18.8
2020 08 19    02 32.26   +00 29.5    1.309    1.906   109.7    30.0  18.4
2020 08 29    02 48.54   -00 03.0    1.164    1.837   115.1    29.8  18.0
2020 09 08    03 04.44   -00 57.2    1.031    1.770   120.5    29.4  17.5
2020 09 18    03 19.70   -02 14.7    0.909    1.704   125.8    28.6  17.1
2020 09 28    03 33.97   -03 54.9    0.799    1.640   130.8    27.5  16.7
2020 10 08    03 46.94   -05 54.5    0.703    1.579   135.5    26.3  16.2
2020 10 18    03 58.16   -08 06.3    0.620    1.522   139.5    25.2  15.8
2020 10 28    04 07.30   -10 16.3    0.550    1.469   142.6    24.2  15.4
2020 11 07    04 14.29   -12 05.0    0.493    1.422   144.7    23.7  15.0
2020 11 17    04 19.27   -13 07.9    0.448    1.382   145.7    23.8  14.7
2020 11 27    04 23.02   -12 58.6    0.414    1.349   145.8    24.3  14.4
2020 12 07    04 26.82   -11 16.9    0.390    1.325   145.4    25.0  14.2
2020 12 17    04 32.10   -07 54.5    0.378    1.310   144.7    25.7  14.1


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

                         (C) Copyright 2020 CBAT
2020 August 15                   (CBET 4829)              Daniel W. E. Green



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