Electronic Telegram No. 5010
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


COMET P/2021 K4 = P/2019 A7 (PANSTARRS)
     M. Rudenko, Minor Planet Center, forwards a report from M. Micheli
conerning the recovery of comet P/2019 A7 (cf. CBET 4605) via images taken in
May with the 8.1-m "Gemini South" telescope at Cerro Pachon, Chile, by H. H.
Hsieh and J. Chavez and in June via images taken with the Canada-France-Hawaii
Telescope at Mauna Kea by Hsieh and D. Faes; the comet is assumed to be
stellar in appearance.  The astrometry is tabulated below.

     2021 UT             R.A. (2000) Decl.       Mag.   Observer
     May  17.17128   16 16 57.86   -35 57 10.0   22.2   Hsieh
          17.17518   16 16 57.67   -35 57 09.3   22.1     "
          17.17907   16 16 57.45   -35 57 08.5   22.6     "
     June 13.36429   15 53 48.06   -33 40 19.0   22.6     "
          13.36816   15 53 47.88   -33 40 17.5   22.6     "
          13.37203   15 53 47.70   -33 40 16.1   22.6     "

The following linked orbital elements by S. Nakano (CBAT) are from 98
observations spanning 2017-2021 (mean residual 0".4).  The recovery
observations have residual +3" mainly in R.A. from the prediction in NK 3846
in the the ICQ's Comet Handbooks for 2020 and 2021.

                    Epoch = 2018 Jan.  2.0 TT
     T = 2018 Jan.  8.33743 TT        Peri. = 119.61009
     e = 0.1607655                    Node  = 280.52536 2000.0
     q = 2.6760339 AU                 Incl. =  17.77072
       a =  3.1886606 AU   n = 0.17309783   P =   5.69 years

                    Epoch = 2023 Sept.13.0 TT
     T = 2023 Sept.12.15705 TT        Peri. = 118.77163
     e = 0.1619652                    Node  = 280.42870 2000.0
     q = 2.6737822 AU                 Incl. =  17.76736
       a =  3.1905383 AU   n = 0.17294505   P =   5.70 years

                    Epoch = 2029 May  24.0 TT
     T = 2029 May  17.82957 TT        Peri. = 118.13397
     e = 0.1602554                    Node  = 280.38533 2000.0
     q = 2.6778466 AU                 Incl. =  17.77772
       a =  3.1888823 AU   n = 0.17307978   P =   5.70 years

                    Epoch = 2035 Feb.  2.0 TT
     T = 2035 Jan. 19.42966 TT        Peri. = 117.07244
     e = 0.1595653                    Node  = 280.25396 2000.0
     q = 2.6822674 AU                 Incl. =  17.75989
       a =  3.1915239 AU   n = 0.17286494   P =   5.70 years


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

                         (C) Copyright 2021 CBAT
2021 August 8                    (CBET 5010)              Daniel W. E. Green