[Iaude] CBET 5078: COMET P/2008 WZ_96 = P/2021 W1

quai at eps.harvard.edu quai at eps.harvard.edu
Fri Dec 3 17:23:36 EST 2021


                                                  Electronic Telegram No. 5078
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/2008 WZ_96 = P/2021 W1 (LINEAR)
     E. Schwab, Egelsbach, Germany, reports his recovery of comet P/2008 WZ_96
(cf. IAUC 9015) on two sets twelve 60-s CCD exposures taken on two nights each
with a 0.8-m f/3 Schmidt telescope at Calar Alto as part of a program with D.
Koschny, M. Micheli, and E. Petrescu; the comet's head has a size of 3".3
(full-width-at-half-maximum) in 2".7 seeing, with no tail.

     2021 UT             R.A. (2000) Decl.       Mag.   Observer
     Nov. 30.02694    6 14 43.64   +28 56 31.8          Schwab
          30.03921    6 14 43.11   +28 56 37.0   19.8     "
          30.05149    6 14 42.61   +28 56 41.7            "
     Dec.  1.19362    6 13 54.45   +29 03 36.7   19.6     "
           1.20590    6 13 53.89   +29 03 40.6   19.6     "
           1.21818    6 13 53.34   +29 03 45.1   19.5     "

The residuals for the recovery observations are -65" in R.A. and -6" in Decl.
from the prediction in NK 3673 and the ICQ's 2020 and 2021 Comet Handbooks,
with a corresponding correction of Delta(T) = +0.026 day.  The following
linked orbital elements by S. Nakano (CBAT) are from 136 observations spanning
2008-2021 (mean residual 0".5).  The comet passed 0.35 AU from Jupiter on 2006
Apr. 8 (which caused some change in the orbit) and 0.81 AU from Jupiter on
2017 Oct. 9 UT.  The comet was missed at its 2015 return.

                    Epoch = 2002 Mar. 27.0 TT
     T = 2002 Mar. 15.43620 TT        Peri. = 318.24904
     e = 0.4442286                    Node  =  72.17501 2000.0
     q = 2.0056512 AU                 Incl. =   5.12784
       a =  3.6087702 AU   n = 0.14376899   P =   6.86 years

                    Epoch = 2009 Jan.  9.0 TT
     T = 2009 Jan. 23.91074 TT        Peri. = 337.62047
     e = 0.5096327                    Node  =  59.11122 2000.0
     q = 1.6462656 AU                 Incl. =   6.95777
       a =  3.3572093 AU   n = 0.16022727   P =   6.15 years

                    Epoch = 2015 Apr.  8.0 TT
     T = 2015 Mar. 25.17786 TT        Peri. = 337.81920
     e = 0.5095990                    Node  =  59.05061 2000.0
     q = 1.6469653 AU                 Incl. =   6.95821
       a =  3.3584051 AU   n = 0.16014171   P =   6.16 years

                    Epoch = 2021 Aug. 14.0 TT
     T = 2021 Aug. 26.06333 TT        Peri. = 341.98153
     e = 0.4693701                    Node  =  56.41790 2000.0
     q = 1.8502096 AU                 Incl. =   7.11459
       a =  3.4868177 AU   n = 0.15137711   P =   6.51 years

                    Epoch = 2028 Mar. 10.0 TT
     T = 2028 Mar.  6.14910 TT        Peri. = 342.11889
     e = 0.4683986                    Node  =  56.38225 2000.0
     q = 1.8567447 AU                 Incl. =   7.10939
       a =  3.4927382 AU   n = 0.15099238   P =   6.53 years

                    Epoch = 2034 Oct.  5.0 TT
     T = 2034 Sept.17.37417 TT        Peri. = 341.97769
     e = 0.4655930                    Node  =  56.32637 2000.0
     q = 1.8727423 AU                 Incl. =   7.10073
       a =  3.5043369 AU   n = 0.15024336   P =   6.56 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 14.0 and 2.5n = 15 for the
magnitudes, splitting the somewhat-discordant magnitudes at the 2008-2009
and the 2021 apparitions (the comet perhaps undergoing an outburst at
the discovery return).

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2021 11 22    06 19.07   +28 06.0    1.105    1.997   145.1    16.4  18.7
2021 12 02    06 13.33   +29 08.5    1.088    2.029   156.1    11.3  18.8
2021 12 12    06 04.81   +30 03.2    1.093    2.064   167.0     6.1  18.9
2021 12 22    05 55.18   +30 44.6    1.122    2.101   172.6     3.5  19.1
2022 01 01    05 46.25   +31 10.6    1.176    2.141   164.7     7.0  19.3
2022 01 11    05 39.57   +31 22.6    1.255    2.181   154.0    11.4  19.6
2022 01 21    05 36.10   +31 24.5    1.355    2.224   143.5    15.3  19.9
2022 01 31    05 36.11   +31 20.1    1.474    2.268   133.5    18.4  20.2
2022 02 10    05 39.48   +31 12.3    1.608    2.313   124.3    20.6  20.5
2022 02 20    05 45.83   +31 02.3    1.755    2.358   115.7    22.2  20.8
2022 03 02    05 54.65   +30 50.6    1.912    2.405   107.6    23.1  21.1
2022 03 12    06 05.50   +30 36.6    2.076    2.452   100.0    23.5  21.4
2022 03 22    06 17.94   +30 19.6    2.245    2.500    92.8    23.4  21.7
2022 04 01    06 31.61   +29 59.0    2.416    2.549    86.0    23.0  22.0
2022 04 11    06 46.21   +29 34.1    2.588    2.597    79.4    22.3  22.3


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

                         (C) Copyright 2021 CBAT
2021 December 3                  (CBET 5078)              Daniel W. E. Green



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