[Iaude] CBET 5307: COMET C/2023 Q2
quai at eps.harvard.edu
quai at eps.harvard.edu
Mon Oct 30 15:51:20 EDT 2023
Electronic Telegram No. 5307
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/2023 Q2 (PANSTARRS)
R. Weryk, Department of Physics and Astronomy, University of Western
Ontario, reports the discovery of another comet in images obtained with the
Pan-STARRS2 1.8-m Ritchey-Chretien reflector at Haleakala (discovery
observations tabulated below, the last two having been made with the
Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala.
2023 UT R.A. (2000) Decl. Mag.
Aug. 23.25322 18 15 42.95 +51 55 52.0 21.1
23.26593 18 15 42.14 +51 55 37.0 21.1
23.27863 18 15 41.33 +51 55 21.9 21.6
23.29131 18 15 40.49 +51 55 06.7 21.1
23.38223 18 15 34.58 +51 53 18.1 20.8
23.38305 18 15 34.53 +51 53 17.1 21.1
Weryk writes that four 60-s gri-band follow-up images obtained on Sept. 9.24
UT with the 3.6-m Canada-France-Hawaii Telescope (queue observer A. Acohido)
shows this to be clearly a comet; in the best image (0".6 seeing), there is
a very condensed head of size 0".7 (full-width-at-half-maximum) with a broad
tail 3" long spanning p.a. 65-120 degrees. Four additional 60-s CFHT
exposures obtained on Oct. 13.2 (queue observer L. Wells; queue coordinator T.
Burdullis) in 1".0 seeing show a very condensed head of size 1".1 (FWHM) and a
broad tail > 10" long spanning p.a. 30-100 degrees.
After the comet was posted on the Minor Planet Center's PCCP webpage, H.
Sato (Bunkyo-ku, Tokyo, Japan) reported that twenty-four stacked 60-s CCD
exposures taken on Sept. 6.2 UT with a 0.51-m f/6.8 astrograph located at the
Utah Desert Remote Observatory (near Beryl Junction, UT, USA) show only a
stellar appearance; the magnitude was 20.2 as measured within a circular
aperture of radius 4".9.
The astrometry appears on MPEC 2023-U285 and includes pre-discovery
Pan-STARRS2 observations from July 6.6 UT (magnitude 21.1-21.2) that were
found later. The following orbital elements by S. Nakano (Central Bureau) are
from 120 observations spanning 2023 July 6-Oct. 29 (mean residual 0".4), with
corresponding original and future values of 1/a being +0.002971 and +0.003341
(+/- 0.000017) AU**-1, respectively.
Epoch = 2024 June 19.0 TT
T = 2024 June 24.04929 TT Peri. = 171.71693
e = 0.9908317 Node = 92.67885 2000.0
q = 3.2094775 AU Incl. = 104.05866
The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 11.5 and 2.5n = 8 for the
magnitudes.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2023 10 23 18 03.16 +30 08.0 4.105 3.947 73.9 14.0 19.3
2023 10 28 18 05.34 +28 31.4 4.132 3.921 70.9 13.9 19.3
2023 11 02 18 07.81 +26 58.4 4.159 3.895 67.9 13.7 19.3
2023 11 07 18 10.53 +25 29.3 4.186 3.869 64.8 13.4 19.3
2023 11 12 18 13.49 +24 04.3 4.212 3.844 61.7 13.1 19.3
2023 11 17 18 16.66 +22 43.3 4.238 3.819 58.7 12.8 19.3
2023 11 22 18 20.00 +21 26.4 4.262 3.794 55.7 12.4 19.3
2023 11 27 18 23.49 +20 13.6 4.284 3.770 52.8 12.0 19.3
2023 12 02 18 27.12 +19 04.8 4.304 3.746 49.9 11.6 19.3
2023 12 12 18 34.68 +16 59.1 4.335 3.700 44.6 10.8 19.2
2023 12 22 18 42.52 +15 08.5 4.352 3.655 40.1 10.0 19.2
2024 01 01 18 50.49 +13 31.9 4.352 3.611 36.7 9.4 19.2
2024 01 11 18 58.45 +12 08.1 4.333 3.570 34.8 9.0 19.1
2024 01 21 19 06.25 +10 55.7 4.294 3.530 34.7 9.1 19.0
2024 01 31 19 13.76 +09 53.2 4.234 3.492 36.5 9.7 19.0
2024 02 10 19 20.83 +08 59.0 4.153 3.456 40.1 10.6 18.9
2024 02 20 19 27.30 +08 11.4 4.050 3.423 45.0 11.8 18.8
2024 02 25 19 30.26 +07 49.4 3.991 3.407 47.8 12.4 18.8
2024 03 01 19 33.01 +07 28.4 3.927 3.391 50.9 13.1 18.7
2024 03 06 19 35.52 +07 07.9 3.858 3.376 54.3 13.8 18.7
2024 03 11 19 37.77 +06 47.9 3.785 3.362 57.8 14.5 18.6
2024 03 16 19 39.72 +06 27.8 3.708 3.348 61.4 15.1 18.5
2024 03 21 19 41.35 +06 07.5 3.626 3.335 65.3 15.7 18.5
2024 03 26 19 42.63 +05 46.4 3.542 3.322 69.3 16.3 18.4
2024 03 31 19 43.52 +05 24.3 3.454 3.310 73.4 16.8 18.4
2024 04 05 19 43.99 +05 00.6 3.364 3.299 77.7 17.2 18.3
2024 04 10 19 43.99 +04 35.0 3.271 3.288 82.2 17.6 18.2
2024 04 15 19 43.48 +04 06.9 3.177 3.278 86.8 17.8 18.1
2024 04 20 19 42.42 +03 35.8 3.083 3.269 91.6 17.9 18.1
2024 04 25 19 40.75 +03 01.0 2.988 3.260 96.6 17.8 18.0
2024 04 30 19 38.44 +02 22.0 2.894 3.252 101.7 17.7 17.9
2024 05 05 19 35.43 +01 38.1 2.802 3.245 107.1 17.3 17.8
2024 05 10 19 31.68 +00 48.6 2.712 3.238 112.7 16.7 17.7
2024 05 15 19 27.14 -00 07.0 2.626 3.232 118.4 16.0 17.7
2024 05 20 19 21.79 -01 09.4 2.545 3.227 124.4 15.0 17.6
2024 05 25 19 15.60 -02 18.8 2.469 3.222 130.7 13.8 17.5
2024 05 30 19 08.58 -03 35.6 2.401 3.218 137.1 12.4 17.5
2024 06 04 19 00.74 -04 59.7 2.342 3.215 143.6 10.8 17.4
2024 06 09 18 52.13 -06 30.7 2.291 3.213 150.3 9.0 17.4
2024 06 14 18 42.83 -08 07.8 2.252 3.211 156.9 7.1 17.3
2024 06 19 18 32.97 -09 49.9 2.224 3.210 163.1 5.3 17.3
2024 06 24 18 22.69 -11 35.5 2.209 3.209 167.9 3.8 17.3
2024 06 29 18 12.15 -13 22.6 2.206 3.210 169.1 3.4 17.3
2024 07 04 18 01.55 -15 09.7 2.216 3.211 165.6 4.5 17.3
2024 07 09 17 51.08 -16 54.8 2.239 3.213 159.9 6.3 17.3
2024 07 14 17 40.94 -18 36.5 2.274 3.215 153.3 8.2 17.3
2024 07 19 17 31.28 -20 13.7 2.321 3.218 146.6 10.0 17.4
2024 07 24 17 22.25 -21 45.5 2.378 3.222 140.0 11.7 17.4
2024 07 29 17 13.94 -23 11.6 2.444 3.227 133.4 13.2 17.5
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2023 CBAT
2023 October 30 (CBET 5307) Daniel W. E. Green
More information about the Iaude
mailing list