[Iaude] CBET 5139: COMET P/2022 L3

quai at eps.harvard.edu quai at eps.harvard.edu
Tue Jun 28 23:37:26 EDT 2022


                                                  Electronic Telegram No. 5139
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/2022 L3 (ATLAS)
     Peter Veres, Minor Planet Center, reports that he noticed cometary
appearance of an object discovered on CCD images taken on June 12.6 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, adding
that he was surprised that the ATLAS team had missed the cometary nature of
the object.  The discovery observations are tabulated below.

     2022 UT             R.A. (2000) Decl.       Mag.
     June 12.57339    1 24 38.96   - 2 13 21.8   17.6
          12.57708    1 24 39.34   - 2 13 18.9   17.2
          12.58861    1 24 40.12   - 2 13 12.2   16.7
          12.59419    1 24 40.63   - 2 13 08.0   17.4
          12.59557    1 24 40.77   - 2 13 07.6   16.6
          12.60661    1 24 41.60   - 2 13 00.7   16.7
          12.60891    1 24 41.83   - 2 12 58.3   17.6

After the comet was posted on the MPC's PCCP webpage, other CCD astrometrists
also reported to the Central Bureau on the cometary appearance.  E. Guido,
Castellammare di Stabia, Italy, writes that twenty stacked 60-s unfiltered
exposures obtained remotely by a large group of observers on June 17.4 UT with
a "Telescope Live" 0.61-m f/6.5 astrograph located at El Sauce, Chile, show a
diffuse irregular coma about 10" in diameter with magnitude 17.1-17.4.  Twelve
stacked 60-s exposures taken remotely by H. Sato, Tokyo, Japan, with a 0.51-m
f/6.8 astrograph located at Mayhill, NM, USA, on June 17.4 show a strongly
condensed coma 12" in diameter with a 20" tail toward p.a. 230 degrees; the
magnitude was 17.3 as measured within a circular aperture of radius 6".5.
Fifty stacked 30-s exposures taken remotely on June 19.14-19.16 by A. Aletti,
F. Bellini, L. Buzzi, and G. Galli with a 0.36-m f/8.4 reflector at Hakos,
Namibia, in a very clear sky and moonlight reveal a condensed 6" coma with a
straight tail at least 30" long in p.a. 235 degrees.  A. Hale, Cloudcroft, NM,
USA, writes that 300-s images taken remotely on June 19.4 with a Las Cumbres
0.40-m f/10 Schmidt-Cassegrain reflector at Cerro Tololo Interamerican
Observatory show a condensed 8" coma and a straight tail 60" long in p.a.
approximately 235 deg.  Additional observations by Hale on June 24.4 using a
Las Cumbres 0.40-m f/10 Schmidt-Cassegrain reflector at McDonald Observatory
show a similar appearance to his June 19 images.  Hale adds that 300-s
exposures taken on June 28.2 with a Las Cumbres 0.40-m f/10 Schmidt-Cassegrain
telescope at Teide/Tenerife suggest that the comet was more obvious and
brighter than on previous nights, with a 7" coma and a straight tail of length
130" in p.a. 230 degrees.  Ten stacked 60-s exposures taken remotely with a
0.50-m f/6.8 astrograph located at Siding Spring, NSW, Australia, on June 24.8
by M. Mattiazzo (Swan Hill, Victoria, Australia) show a strongly condensed
coma about 10" in diameter and of mag 17.3, with a clear tail 2' long in p.a.
233 degrees.
     The available astrometry appear on MPEC 2022-M96.  The following
preliminary, unperturbed elliptical orbital elements by S. Nakano (Central
Bureau) are from 49 observations spanning June 12-28 (mean residual 0".6),
with Nakano noting that, while the observations still fit a parabola, it is
likely to be a short-period comet (with a suggested pass of 2.25 AU from
Jupiter this past March).  Nakano was unable to find astrometry at previous
returns in archival data.

     T = 2022 Oct. 31.16877 TT        Peri. =  10.77106
     e = 0.6176979                    Node  =  29.71425 2000.0
     q = 2.4125748 AU                 Incl. =  21.56655
       a =  6.3106499 AU   n = 0.06217173   P =  15.9 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 10.5 and 2.5n = 10 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2022 05 21    00 53.06   -06 25.0    3.310    2.785    50.9    16.4  17.5
2022 05 31    01 07.24   -04 32.4    3.176    2.744    56.2    17.9  17.4
2022 06 10    01 21.13   -02 41.6    3.036    2.706    61.6    19.3  17.2
2022 06 20    01 34.65   -00 52.6    2.894    2.669    67.2    20.5  17.1
2022 06 30    01 47.71   +00 54.3    2.749    2.635    72.8    21.6  16.9
2022 07 10    02 00.17   +02 39.1    2.603    2.602    78.7    22.5  16.7
2022 07 20    02 11.87   +04 22.1    2.457    2.572    84.8    23.2  16.6
2022 07 30    02 22.60   +06 03.4    2.312    2.543    91.2    23.5  16.4
2022 08 09    02 32.12   +07 43.5    2.170    2.518    97.9    23.5  16.2
2022 08 19    02 40.14   +09 23.3    2.032    2.495   105.0    23.1  16.0
2022 08 29    02 46.31   +11 03.4    1.902    2.474   112.7    22.1  15.8
2022 09 08    02 50.27   +12 44.5    1.781    2.456   121.0    20.6  15.7
2022 09 18    02 51.67   +14 27.1    1.672    2.442   129.9    18.4  15.5
2022 09 28    02 50.22   +16 10.8    1.578    2.430   139.6    15.5  15.3
2022 10 08    02 45.87   +17 54.0    1.504    2.421   149.9    12.0  15.2
2022 10 18    02 38.90   +19 34.2    1.453    2.415   160.5     7.9  15.1
2022 10 28    02 30.01   +21 07.6    1.427    2.413   170.3     4.0  15.1
2022 11 07    02 20.34   +22 31.2    1.429    2.413   171.0     3.7  15.1
2022 11 17    02 11.24   +23 43.9    1.459    2.417   161.5     7.4  15.2
2022 11 27    02 03.94   +24 46.7    1.514    2.424   150.9    11.4  15.2
2022 12 07    01 59.35   +25 43.0    1.592    2.434   140.5    14.9  15.4


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

                         (C) Copyright 2022 CBAT
2022 June 29                     (CBET 5139)              Daniel W. E. Green



More information about the Iaude mailing list