[Iaude] CBET 5400: COMET P/2024 H1 = P/2018 L5

quai at eps.harvard.edu quai at eps.harvard.edu
Fri May 31 18:36:09 EDT 2024


                                                  Electronic Telegram No. 5400
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/2024 H1 = P/2018 L5 (Leonard)
     Erwin Schwab, Egelsbach, Germany, reports his recovery of comet P/2018 L5
(cf. CBET 4528) on CCD images that he obtained (along with F. Ocana, L.
Conversi, R. Kresken, and M. Micheli) using the 0.8-m f/3 Schmidt telescope at
Calar Alto on Apr. 18, when twelve stacked 60-s exposures showed no tail and
no coma visible.  Schwab obtained eight 60-s confirming frames with a 1.0-m
f/8 reflector of Las Cumbres Observatory at Sutherland, South Africa, on Apr.
21; when he stacked the eight exposures, they show no tail, but the head shows
a size of 2".3 (full-width-at-half-maximum) compared to nearby stars with FWHM
1".5.  Schwab's astrometry is given below.

     2024 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr. 18.06708   15 03 32.70   -17 07 04.8   20.7   Schwab
          18.07627   15 03 32.31   -17 07 03.2   21.1     "
          18.08546   15 03 31.96   -17 07 01.2   21.1     "
          18.09465   15 03 31.64   -17 06 59.4   20.6     "
          21.11250   15 01 35.65   -16 56 58.8   21.2     "
          21.12090   15 01 35.29   -16 56 57.4   20.8     "
          21.12928   15 01 34.93   -16 56 55.6   21.3     "

Additional astrometry appears on MPEC 2024-K145, which includes observations
made at two observatories in incidental astrometry sent to the Minor Planet
Center (and identified with this comet at the MPC):  images obtained with the
Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala on May 3, 9, and 29;
and images obtained with the 1.5-m Mt. Lemmon Survey reflector on Apr. 29
(with the magnitudes given as 19.9-21.0) and May 9 (mag 20.0-21.1).
     The residuals for the recovery observations are +48" in R.A. and -12" in
Decl. from the prediction in NK 4854 and the ICQ's Comet Handbook 2024, with a
corresponding correction of Delta(T) = -0.054 day.  The following linked
orbital elements by S. Nakano (Central Bureau) are from 219 observations
spanning 2018 June 8-2024 May 29 (mean residual 0".5).  The comet passed 0.40
and 0.37 AU from Jupiter on 1978 July 19 and 2014 Sept. 25 UT, respectively.
A search by Nakano of archival astrometry produced no definite observations of
this comet, but there is a possible identification with 1937 BG (a single
observation) with residuals of +0.39 deg in R.A. and -0.01 deg in Decl., with
a corresponding correction of Delta(T) = +3.7 days.

                    Epoch = 2001 July 30.0 TT
     T = 2001 July 14.89821 TT        Peri. =  18.35548
     e = 0.1747547                    Node  = 294.15866 2000.0
     q = 3.5102781 AU                 Incl. =   3.48230
       a =  4.2536180 AU   n = 0.11234826   P =   8.77 years

                    Epoch = 2010 Mar. 25.0 TT
     T = 2010 Apr.  9.85065 TT        Peri. =  17.94233
     e = 0.1773608                    Node  = 294.14368 2000.0
     q = 3.4964970 AU                 Incl. =   3.48227
       a =  4.2503412 AU   n = 0.11247821   P =   8.76 years

                    Epoch = 2018 May   2.0 TT
     T = 2018 May   4.47949 TT        Peri. =  93.63886
     e = 0.3644086                    Node  = 219.15712 2000.0
     q = 2.3033244 AU                 Incl. =   2.20919
       a =  3.6239073 AU   n = 0.14286915   P =   6.90 years

                    Epoch = 2025 Mar. 26.0 TT
     T = 2025 Apr.  3.84050 TT        Peri. =  93.94579
     e = 0.3635962                    Node  = 219.02484 2000.0
     q = 2.3089275 AU                 Incl. =   2.20948
       a =  3.6280859 AU   n = 0.14262240   P =   6.91 years

                    Epoch = 2032 Feb. 18.0 TT
     T = 2032 Feb. 27.27324 TT        Peri. =  93.55033
     e = 0.3616592                    Node  = 218.91580 2000.0
     q = 2.3202551 AU                 Incl. =   2.20771
       a =  3.6348221 AU   n = 0.14222611   P =   6.93 years

                    Epoch = 2039 Feb. 21.0 TT
     T = 2039 Feb.  3.41582 TT        Peri. =  93.70213
     e = 0.3597946                    Node  = 218.76232 2000.0
     q = 2.3316880 AU                 Incl. =   2.20612
       a =  3.6420935 AU   n = 0.14180040   P =   6.95 years

The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 13.5 and 2.5n = 10 for the
magnitudes.

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase  Mag.
2024 05 10    14 47.60   -15 44.1    2.083    3.090   174.7     1.7  20.0
2024 05 20    14 40.05   -15 03.3    2.073    3.055   163.1     5.5  19.9
2024 05 30    14 33.43   -14 26.2    2.088    3.020   151.8     9.1  19.9
2024 06 09    14 28.37   -13 56.5    2.127    2.985   140.9    12.4  19.9
2024 06 19    14 25.33   -13 36.8    2.187    2.950   130.6    15.2  19.9
2024 06 29    14 24.52   -13 28.8    2.261    2.916   120.8    17.4  19.9
2024 07 09    14 25.99   -13 32.5    2.347    2.881   111.6    19.1  19.9
2024 07 19    14 29.68   -13 47.6    2.441    2.848   103.0    20.3  20.0
2024 07 29    14 35.44   -14 12.6    2.538    2.814    94.9    21.1  20.0
2024 08 08    14 43.12   -14 46.1    2.638    2.781    87.3    21.4  20.0
2024 08 18    14 52.56   -15 26.4    2.735    2.748    80.1    21.3  20.1
2024 08 28    15 03.59   -16 11.6    2.830    2.716    73.2    20.9  20.1
2024 09 07    15 16.08   -17 00.0    2.920    2.685    66.6    20.2  20.1
2024 09 17    15 29.91   -17 49.8    3.005    2.654    60.3    19.2  20.1
2024 09 27    15 44.97   -18 39.2    3.082    2.624    54.2    18.0  20.1
2024 10 07    16 01.18   -19 26.8    3.151    2.595    48.3    16.7  20.1
2024 10 17    16 18.42   -20 10.7    3.212    2.567    42.5    15.2  20.1

2025 03 26    21 50.44   -11 15.9    2.993    2.310    39.3    15.9  19.5
2025 04 05    22 09.42   -09 30.7    2.918    2.309    44.2    17.6  19.5
2025 04 15    22 27.76   -07 43.4    2.838    2.310    49.1    19.2  19.4
2025 04 25    22 45.44   -05 55.4    2.754    2.313    54.2    20.6  19.3
2025 05 05    23 02.38   -04 08.2    2.666    2.319    59.3    22.0  19.3
2025 05 15    23 18.53   -02 23.5    2.574    2.326    64.6    23.1  19.2
2025 05 25    23 33.80   -00 42.7    2.479    2.335    70.0    24.1  19.2
2025 06 04    23 48.08   +00 52.7    2.381    2.346    75.7    24.8  19.1
2025 06 14    00 01.24   +02 21.1    2.282    2.359    81.6    25.2  19.0
2025 06 24    00 13.10   +03 41.0    2.182    2.374    87.9    25.3  18.9
2025 07 04    00 23.46   +04 50.8    2.082    2.390    94.6    25.1  18.9
2025 07 14    00 32.09   +05 48.8    1.985    2.408   101.8    24.4  18.8
2025 07 24    00 38.73   +06 33.5    1.891    2.428   109.5    23.2  18.7
2025 08 03    00 43.12   +07 03.0    1.804    2.449   117.9    21.5  18.7
2025 08 13    00 45.07   +07 16.2    1.726    2.471   126.9    19.1  18.6
2025 08 23    00 44.48   +07 11.9    1.661    2.495   136.7    16.1  18.6
2025 09 02    00 41.46   +06 50.4    1.612    2.520   147.2    12.5  18.6
2025 09 12    00 36.39   +06 13.5    1.584    2.546   158.2     8.4  18.6
2025 09 22    00 29.92   +05 25.1    1.580    2.574   169.7     4.0  18.6
2025 10 02    00 22.96   +04 31.0    1.601    2.602   177.5     1.0  18.7
2025 10 12    00 16.47   +03 38.0    1.650    2.631   166.5     5.1  18.8
2025 10 22    00 11.28   +02 52.1    1.725    2.661   155.2     9.0  18.9
2025 11 01    00 07.99   +02 18.3    1.823    2.692   144.3    12.4  19.1
2025 11 11    00 06.91   +01 59.1    1.942    2.723   133.9    15.2  19.3
2025 11 21    00 08.05   +01 55.2    2.078    2.755   124.0    17.3  19.5
2025 12 01    00 11.33   +02 06.2    2.228    2.788   114.7    18.7  19.7


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

                         (C) Copyright 2024 CBAT
2024 May 31                      (CBET 5400)              Daniel W. E. Green




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