[Iaude] CBET 4831: COMET P/2011 U2

quai at eps.harvard.edu quai at eps.harvard.edu
Sun Aug 16 16:13:04 EDT 2020


                                                  Electronic Telegram No. 4831
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


RECOVERY OF COMET P/2011 U2 (BRESSI)
     S. Nakano, Central Bureau, has identified apparently asteroidal recovery
observations of this comet (cf. IAUC 9236) from CCD images obtained with the
Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala, Hawaii (recovery
observations tabulated below, which appeared on MPECs 2020-M114 and 2020-P19.
The comet had not been seen in more than four years.

     2020 UT             R.A. (2000) Decl.       Mag.
     June 17.54706   20 28 16.84   -11 55 51.5   22.1
          17.56089   20 28 16.57   -11 55 50.8   22.1
          17.57469   20 28 16.30   -11 55 50.3   22.0
          17.58852   20 28 16.04   -11 55 49.7   21.9
     July 17.42991   20 14 46.46   -11 57 07.2   21.3
          17.44419   20 14 45.99   -11 57 07.9   21.2
          17.45843   20 14 45.52   -11 57 08.2   21.2
          20.43771   20 13 08.37   -11 59 19.4   21.3
          20.44944   20 13 07.94   -11 59 20.1   21.1
          20.46116   20 13 07.55   -11 59 20.6   20.8
          20.47289   20 13 07.15   -11 59 21.3   21.0

The residuals of the recovery observations above were -5" in R.A. and -2" in
Decl. from the prediction on NK 3378 and in the ICQ's Comet Handbooks for
2018, 2019, and 2020; the indicated correction to the time of perihelion is
Delta(T) = +0.016 day.  The following linked orbital elements by Nakano are
from 180 observations spanning 2011-2020 (mean residual 0".46).  The comet
passed 0.97 AU from Jupiter on 2020 Feb. 5 UT.

                    Epoch = 2012 Apr. 23.0 TT
     T = 2012 May   7.85725 TT        Peri. = 157.76736
     e = 0.1109095                    Node  = 266.69288 2000.0
     q = 4.8373359 AU                 Incl. =   9.63005
       a =  5.4407691 AU   n = 0.07766290   P =  12.69 years

                    Epoch = 2023 Oct. 23.0 TT
     T = 2023 Nov.  4.13301 TT        Peri. = 169.36813
     e = 0.1275293                    Node  = 260.04100 2000.0
     q = 4.1325775 AU                 Incl. =   9.79308
       a =  4.7366373 AU   n = 0.09560902   P =  10.31 years

                    Epoch = 2033 Dec. 29.0 TT
     T = 2034 Jan.  9.14566 TT        Peri. = 168.08834
     e = 0.1255940                    Node  = 260.02237 2000.0
     q = 4.1206056 AU                 Incl. =   9.80746
       a =  4.7124624 AU   n = 0.09634567   P =  10.23 years

                    Epoch = 2044 Apr. 15.0 TT
     T = 2044 Apr. 18.71285 TT        Peri. = 167.99930
     e = 0.1248598                    Node  = 259.96175 2000.0
     q = 4.1502398 AU                 Incl. =   9.78883
       a =  4.7423712 AU   n = 0.09543568   P =  10.33 years

The following 20-day ephemeris by the undersigned from the above orbital
elements runs through the forthcoming perihelion passage and uses photometric
power-law parameters H = 9.0 and 2.5n = 10 for the magnitudes; the reported
magnitudes near aphelion in 2015 and 2016 are 1-2 mag fainter than these
parameters suggest.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2020 07 10    20 18.69   -11 53.1    4.139    5.116   162.1     3.5  19.2
2020 07 30    20 07.90   -12 08.2    4.093    5.097   170.4     1.9  19.1
2020 08 19    19 57.94   -12 32.3    4.164    5.078   151.8     5.4  19.2
2020 09 08    19 51.41   -12 56.9    4.336    5.058   131.4     8.6  19.2
2020 09 28    19 49.87   -13 14.8    4.582    5.039   111.7    10.6  19.3
2020 10 18    19 53.66   -13 20.5    4.867    5.019    93.0    11.4  19.4
2020 11 07    20 02.27   -13 10.7    5.157    4.999    75.3    11.1  19.6
2020 11 27    20 14.80   -12 43.2    5.424    4.978    58.4     9.7  19.6
2020 12 17    20 30.22   -11 57.2    5.643    4.958    42.1     7.7  19.7
2021 01 06    20 47.57   -10 53.0    5.797    4.937    26.5     5.1  19.8
2021 01 26    21 05.97   -09 32.3    5.874    4.916    12.2     2.4  19.8
2021 02 15    21 24.62   -07 57.6    5.869    4.895     8.7     1.7  19.7
2021 03 07    21 42.82   -06 12.3    5.782    4.874    21.6     4.3  19.7
2021 03 27    21 59.92   -04 20.6    5.619    4.852    36.4     7.0  19.6
2021 04 16    22 15.28   -02 27.2    5.390    4.831    51.5     9.4  19.5
2021 05 06    22 28.19   -00 37.5    5.111    4.809    67.1    11.1  19.4
2021 05 26    22 37.90   +01 02.2    4.798    4.788    83.3    12.1  19.2
2021 06 15    22 43.63   +02 24.9    4.477    4.766   100.4    12.1  19.0
2021 07 05    22 44.66   +03 22.4    4.175    4.744   118.5    10.9  18.9
2021 07 25    22 40.73   +03 46.8    3.923    4.723   137.6     8.3  18.7
2021 08 14    22 32.56   +03 34.0    3.752    4.701   156.9     4.9  18.6
2021 09 03    22 22.17   +02 47.5    3.689    4.679   167.8     2.6  18.5
2021 09 23    22 12.53   +01 41.5    3.740    4.658   153.2     5.6  18.5
2021 10 13    22 06.47   +00 36.2    3.896    4.636   133.2     9.0  18.6
2021 11 02    22 05.64   -00 10.8    4.130    4.615   113.4    11.4  18.7
2021 11 22    22 10.30   -00 29.0    4.406    4.594    94.7    12.4  18.8
2021 12 12    22 19.84   -00 15.1    4.692    4.573    77.0    12.1  19.0
2022 01 01    22 33.25   +00 29.7    4.958    4.552    60.3    10.8  19.1
2022 01 21    22 49.51   +01 41.6    5.181    4.531    44.4     8.7  19.1
2022 02 10    23 07.70   +03 15.6    5.344    4.510    29.4     6.2  19.2
2022 03 02    23 27.06   +05 06.6    5.437    4.490    15.5     3.4  19.2
2022 03 22    23 46.94   +07 09.2    5.455    4.470     7.9     1.8  19.2
2022 04 11    00 06.79   +09 18.2    5.397    4.451    17.3     3.8  19.1
2022 05 01    00 26.07   +11 28.7    5.267    4.431    30.7     6.7  19.1
2022 05 21    00 44.23   +13 36.1    5.073    4.412    44.7     9.3  19.0
2022 06 10    01 00.59   +15 35.8    4.826    4.394    59.2    11.4  18.8
2022 06 30    01 14.35   +17 23.2    4.539    4.376    74.4    12.9  18.7
2022 07 20    01 24.50   +18 52.7    4.231    4.358    90.4    13.5  18.5
2022 08 09    01 29.97   +19 57.7    3.925    4.341   107.6    12.9  18.3
2022 08 29    01 29.85   +20 29.8    3.649    4.324   126.3    10.9  18.2
2022 09 18    01 24.06   +20 20.9    3.437    4.308   146.2     7.5  18.0
2022 10 08    01 14.07   +19 28.4    3.318    4.292   165.3     3.4  17.9
2022 10 28    01 03.11   +18 03.2    3.315    4.277   163.6     3.8  17.9
2022 11 17    00 54.89   +16 29.9    3.427    4.263   143.6     7.9  18.0
2022 12 07    00 52.03   +15 15.2    3.632    4.249   122.9    11.2  18.1
2022 12 27    00 55.34   +14 35.5    3.899    4.236   103.4    13.1  18.2
2023 01 16    01 04.34   +14 34.6    4.191    4.224    85.2    13.4  18.4
2023 02 05    01 18.00   +15 07.8    4.476    4.212    68.3    12.6  18.5
2023 02 25    01 35.25   +16 07.0    4.731    4.201    52.4    10.8  18.6
2023 03 17    01 55.18   +17 23.3    4.938    4.191    37.4     8.3  18.7
2023 04 06    02 17.01   +18 48.6    5.083    4.181    23.1     5.4  18.7
2023 04 26    02 40.13   +20 15.7    5.161    4.173     9.8     2.3  18.8
2023 05 16    03 03.94   +21 38.8    5.168    4.165     6.5     1.6  18.8
2023 06 05    03 27.89   +22 53.4    5.105    4.158    18.9     4.5  18.7
2023 06 25    03 51.36   +23 56.4    4.976    4.152    32.3     7.5  18.7
2023 07 15    04 13.62   +24 45.6    4.786    4.146    46.1    10.2  18.6
2023 08 04    04 33.78   +25 20.3    4.545    4.142    60.6    12.3  18.5
2023 08 24    04 50.76   +25 40.9    4.267    4.138    75.9    13.7  18.3
2023 09 13    05 03.27   +25 48.3    3.969    4.136    92.4    14.1  18.2
2023 10 03    05 09.95   +25 43.3    3.676    4.134   110.4    13.1  18.0
2023 10 23    05 09.70   +25 25.5    3.419    4.133   130.3    10.6  17.8
2023 11 12    05 02.52   +24 53.0    3.233    4.133   152.0     6.5  17.7
2023 12 02    04 50.46   +24 05.1    3.151    4.133   174.8     1.2  17.7
2023 12 22    04 37.64   +23 07.8    3.190    4.135   161.6     4.3  17.7
2024 01 11    04 28.52   +22 14.5    3.345    4.138   139.0     9.0  17.8
2024 01 31    04 25.82   +21 37.0    3.587    4.141   117.9    12.1  17.9
2024 02 20    04 30.09   +21 19.3    3.880    4.145    98.6    13.6  18.1
2024 03 11    04 40.51   +21 17.4    4.189    4.150    81.0    13.7  18.3
2024 03 31    04 55.84   +21 24.0    4.485    4.156    64.7    12.5  18.4


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

                         (C) Copyright 2020 CBAT
2020 August 16                   (CBET 4831)              Daniel W. E. Green



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