[Iaude] CBET 4792: COMET P/2019 Y2 = P/2013 J4

quai at eps.harvard.edu quai at eps.harvard.edu
Mon Jun 8 14:33:27 EDT 2020


                                                  Electronic Telegram No. 4792
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/2013 J4 (PANSTARRS) = P/2019 Y2 (FULS)
     M. Meyer, Limburg, Germany, reports that S. Deen (location unknown)
suggested that comet P/2013 J4 (cf. CBET 3521) and comet P/2019 Y2 (cf. CBET
4709) are the same object.  S. Nakano, Sumoto, Japan, has confirmed the
identification, and his orbital elements below are from 659 observations
spanning 2013 May 5-2020 May 29 (mean residual 0".6).  Note that the 2013
apparition had only a one-week arc of astrometry, and even a parabolic orbit
can satisfy those observations alone; however, an orbit from the current
apparition by Nakano that was published in NK 4128 give residuals for the
2013 observations of -0.05 degree (mainly in R.A.), with Delta(T) correction
+0.20 day.  The comet passed 0.34 AU from Jupiter on 2010 Nov. 26 UT; prior
to that close approach, the orbit was somewhat larger, with the following
approximate orbital elements provided by Nakano for the previous return:
T = 2006 May 23.0 TT, q = 2.736 AU, e = 0.288, Peri. = 33.4 deg, Node =
134.0 deg, i = 5.7 deg (equinox J2000.0), a = 3.84 AU, P = 7.53 years.

                    Epoch = 2013 Aug. 16.0 TT
     T = 2013 Aug. 27.85722 TT        Peri. =  92.11297
     e = 0.3854323                    Node  =  80.88801 2000.0
     q = 2.1218169 AU                 Incl. =   4.89732
       a =  3.4525358 AU   n = 0.15363734   P =   6.42 years

                    Epoch = 2020 Feb.  1.0 TT
     T = 2020 Jan. 31.81781 TT        Peri. =  92.33659
     e = 0.3848922                    Node  =  80.83603 2000.0
     q = 2.1248153 AU                 Incl. =   4.89623
       a =  3.4543786 AU   n = 0.15351442   P =   6.42 years

                    Epoch = 2026 July 19.0 TT
     T = 2026 July 25.41973 TT        Peri. =  92.97913
     e = 0.3748779                    Node  =  80.22878 2000.0
     q = 2.1834330 AU                 Incl. =   4.87184
       a =  3.4928105 AU   n = 0.15098769   P =   6.53 years

                    Epoch = 2033 Feb. 12.0 TT
     T = 2033 Feb.  6.58554 TT        Peri. =  93.07946
     e = 0.3731330                    Node  =  80.19245 2000.0
     q = 2.1924931 AU                 Incl. =   4.86952
       a =  3.4975409 AU   n = 0.15068148   P =   6.54 years

The following updated ephemeris by the undersigned from the above elements
extends that on CBET 4709 (photometric power-law parameters H = 13.0 and 2.5n
= 10 used for the magnitudes, which are about two magnitudes brighter than
the reported magnitudes in 2013).

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2020 04 21    13 08.74   +00 50.0    1.223    2.203   162.8     7.8  16.9
2020 05 01    13 03.56   +00 46.6    1.279    2.223   152.7    12.0  17.0
2020 05 11    13 00.55   +00 25.3    1.356    2.245   142.8    15.8  17.2
2020 05 21    13 00.03   -00 13.0    1.450    2.268   133.5    18.9  17.4
2020 05 31    13 02.05   -01 06.1    1.559    2.294   124.8    21.3  17.6
2020 06 10    13 06.44   -02 11.4    1.679    2.321   116.8    23.0  17.8
2020 06 20    13 12.91   -03 26.2    1.810    2.349   109.2    24.1  18.0
2020 06 30    13 21.21   -04 48.1    1.948    2.379   102.1    24.7  18.2
2020 07 10    13 31.04   -06 14.8    2.091    2.410    95.4    24.8  18.4
2020 07 20    13 42.15   -07 44.6    2.238    2.442    89.0    24.6  18.6
2020 07 30    13 54.38   -09 15.8    2.388    2.475    82.8    24.0  18.8
2020 08 09    14 07.54   -10 47.0    2.538    2.509    76.8    23.2  19.0
2020 08 19    14 21.49   -12 17.0    2.688    2.544    71.0    22.1  19.2
2020 08 29    14 36.15   -13 44.6    2.836    2.580    65.2    20.8  19.4
2020 09 08    14 51.41   -15 08.9    2.980    2.616    59.4    19.4  19.5


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

                         (C) Copyright 2020 CBAT
2020 June 8                      (CBET 4792)              Daniel W. E. Green



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