[Iaude] CBET 5106: COMET C/2022 A3

quai at eps.harvard.edu quai at eps.harvard.edu
Mon Mar 7 01:57:36 EST 2022


                                                  Electronic Telegram No. 5106
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 C/2022 A3 (LEMMON-ATLAS)
     An apparently asteroidal object discovered on CCD images taken on Mar. 1
UT with a 0.5-m f/2 Schmidt reflector at Mauna Loa, Hawaii, in the course of
the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program has
been found to show cometary appearance by CCD astrometrists elsewhere after it
was posted on the Minor Planet Center's PCCP webpage.  The discovery
observations are tabulated below.

     2022 UT             R.A. (2000) Decl.       Mag.
     Mar.  1.42136   10 19 15.99   +39 37 47.7   19.2
           1.43901   10 19 14.76   +39 37 46.9   19.1
           1.43992   10 19 14.66   +39 37 46.2   18.9
           1.47528   10 19 12.37   +39 37 44.4   19.1

Earlier apparently asteroidal CCD observations obtained in January with the
Mt. Lemmon Survey's 1.5-m reflector were then identified in the MPC's
"isolated tracklet file" (which is visible publicly) that were reported as
separate objects on each night but which should have been linked previously.
The ITF Mt. Lemmon observations are tabulated below:

     2022 UT             R.A. (2000) Decl.       Mag.
     Jan. 10.42680   11 05 01.05   +38 34 09.8   20.3
          10.43215   11 05 00.82   +38 34 10.6   20.1
          10.43749   11 05 00.69   +38 34 11.2   20.2
          10.44283   11 05 00.47   +38 34 12.3   20.2
          29.41413   10 50 47.73   +39 22 00.3   19.8
          29.42028   10 50 47.40   +39 22 00.8   19.9
          29.42639   10 50 47.09   +39 22 01.6   19.8
          29.43251   10 50 46.77   +39 22 02.6   19.9
          31.37108   10 49 02.41   +39 25 56.0   19.9
          31.37638   10 49 02.13   +39 25 56.9   19.8
          31.38169   10 49 01.82   +39 25 57.4   19.8
          31.38700   10 49 01.54   +39 25 57.8   19.6
     Feb. 22.39853   10 26 48.22   +39 44 26.4   19.9
          22.40372   10 26 47.88   +39 44 26.3   19.5
          22.40891   10 26 47.55   +39 44 26.2   19.6
          22.41412   10 26 47.19   +39 44 25.8   19.6

E. Bryssinck, Kruibeke, Belgium, writes that forty stacked, 120-s unfiltered
CCD images taken with a 0.4-m f/3.8 reflector on Mar. 3.8 UT show a compact,
condensed, elongated coma of size 7" x 12" and a hint of a short tail about
6" long in p.a. 130 degrees; the magnitude was 19.5 as measured within a
circular aperture of radius 5".5.  Forty-five 60-s CCD exposures taken by
L. Buzzi and A. Aletti, Varese, Italy, with a 0.84-m f/3.5 reflector in good
conditions show a very condensed coma 5" wide with a faint extension toward
the north.
     In addition, Mt. Lemmon observations from 2021 Apr. 30.2 (mag 22.1-22.6)
and Dec. 1.5 UT were reported to the MPC after the object was posted online;
all of the astrometry appear on MPEC 2022-E107.  The following orbital
elements by S. Nakano (Central Bureau) are from 104 observations spanning 2021
Apr. 30-2022 Mar. 6 (mean residual 0".4), with corresponding original and
future values for 1/a of +0.001157 and +0.000980 AU**-1, respectively (formal
error +/- 0.000012 AU**-1), with no close approaches to any major planets.

                    Epoch = 2023 Sept.13.0 TT
     T = 2023 Sept.28.86676 TT        Peri. = 234.84715
     e = 0.9958084                    Node  = 325.47985 2000.0
     q = 3.7035554 AU                 Incl. =  88.34333

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 9.0 and 2.5n = 8 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2022 03 02    10 18.65   +39 36.9    5.255    6.110   147.0     5.1  18.9
2022 03 12    10 08.16   +39 14.7    5.253    6.049   140.0     6.1  18.9
2022 03 22    09 58.43   +38 38.6    5.281    5.987   131.5     7.2  18.8
2022 04 01    09 49.87   +37 50.2    5.333    5.926   122.2     8.2  18.8
2022 04 11    09 42.75   +36 51.4    5.405    5.865   112.7     9.1  18.8
2022 04 21    09 37.23   +35 44.5    5.492    5.804   103.2     9.7  18.8
2022 05 01    09 33.32   +34 31.7    5.589    5.744    93.8    10.1  18.8
2022 05 11    09 30.96   +33 14.9    5.690    5.684    84.5    10.2  18.8
2022 05 21    09 30.01   +31 55.5    5.791    5.624    75.5    10.0  18.8
2022 05 31    09 30.34   +30 34.6    5.887    5.564    66.7     9.6  18.8
2022 06 10    09 31.78   +29 12.9    5.974    5.505    58.1     9.0  18.8
2022 06 20    09 34.16   +27 50.8    6.048    5.446    49.7     8.2  18.8

2022 10 28    10 31.10   +09 50.0    5.164    4.721    58.4    10.3  18.0
2022 11 07    10 33.20   +08 24.7    4.959    4.669    67.4    11.3  17.8
2022 11 17    10 34.23   +06 59.1    4.744    4.619    76.7    12.0  17.7
2022 11 27    10 33.97   +05 33.2    4.524    4.569    86.4    12.4  17.6
2022 12 07    10 32.20   +04 07.4    4.303    4.520    96.3    12.5  17.4
2022 12 17    10 28.70   +02 41.9    4.088    4.472   106.7    12.2  17.3
2022 12 27    10 23.26   +01 17.3    3.884    4.425   117.4    11.4  17.1
2023 01 06    10 15.76   -00 05.4    3.699    4.378   128.5    10.1  17.0
2023 01 16    10 06.20   -01 25.0    3.537    4.333   139.6     8.5  16.8
2023 01 26    09 54.73   -02 39.6    3.407    4.290   150.2     6.5  16.7
2023 02 05    09 41.76   -03 47.4    3.313    4.247   158.7     4.8  16.6
2023 02 15    09 27.90   -04 46.8    3.258    4.205   161.3     4.3  16.6
2023 02 25    09 13.91   -05 36.7    3.243    4.165   155.8     5.6  16.5
2023 03 07    09 00.61   -06 17.4    3.265    4.126   146.1     7.7  16.5
2023 03 17    08 48.66   -06 50.3    3.321    4.089   135.3     9.9  16.5
2023 03 27    08 38.57   -07 17.4    3.405    4.052   124.4    11.7  16.5
2023 04 06    08 30.59   -07 41.5    3.509    4.018   113.8    13.2  16.6
2023 04 16    08 24.77   -08 05.2    3.626    3.985   103.7    14.2  16.6
2023 04 26    08 21.03   -08 30.8    3.750    3.953    94.2    14.7  16.6
2023 05 06    08 19.20   -09 00.4    3.875    3.923    85.3    14.8  16.7
2023 05 16    08 19.05   -09 35.4    3.997    3.895    77.0    14.6  16.7
2023 05 26    08 20.36   -10 17.0    4.111    3.869    69.2    14.2  16.8
2023 06 05    08 22.92   -11 06.4    4.213    3.844    62.1    13.5  16.8
2023 06 15    08 26.51   -12 04.3    4.302    3.821    55.6    12.7  16.8
2023 06 25    08 30.95   -13 11.4    4.376    3.801    49.8    11.8  16.8
2023 07 05    08 36.09   -14 28.3    4.433    3.782    44.9    10.9  16.9
2023 07 15    08 41.77   -15 55.7    4.473    3.765    41.0    10.2  16.9
2023 07 25    08 47.87   -17 34.2    4.494    3.750    38.2     9.7  16.9
2023 08 04    08 54.24   -19 24.3    4.499    3.737    36.9     9.4  16.8
2023 08 14    09 00.79   -21 26.6    4.487    3.726    36.9     9.4  16.8
2023 08 24    09 07.38   -23 41.8    4.459    3.717    38.2     9.7  16.8
2023 09 03    09 13.90   -26 10.5    4.417    3.711    40.7    10.2  16.8
2023 09 13    09 20.21   -28 53.0    4.363    3.706    44.1    10.9  16.8
2023 09 23    09 26.14   -31 50.0    4.298    3.704    48.1    11.6  16.7
2023 10 03    09 31.53   -35 01.6    4.227    3.704    52.5    12.4  16.7
2023 10 13    09 36.13   -38 27.5    4.150    3.706    57.2    13.1  16.6
2023 10 23    09 39.64   -42 07.2    4.073    3.710    61.9    13.7  16.6
2023 11 02    09 41.65   -45 59.2    3.997    3.716    66.6    14.2  16.6
2023 11 12    09 41.62   -50 01.1    3.926    3.724    71.1    14.6  16.5
2023 11 22    09 38.76   -54 09.2    3.863    3.735    75.2    14.8  16.5
2023 12 02    09 31.97   -58 17.8    3.812    3.747    78.8    15.0  16.5
2023 12 12    09 19.70   -62 18.9    3.773    3.762    81.8    15.0  16.5
2023 12 22    08 59.92   -66 01.3    3.750    3.779    84.1    15.0  16.5
2024 01 01    08 30.44   -69 10.1    3.742    3.797    85.7    15.0  16.5


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

                         (C) Copyright 2022 CBAT
2022 March 7                     (CBET 5106)              Daniel W. E. Green



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