Electronic Telegram No. 5193 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network COMET P/2022 V1 = P/2010 BN_109 (WISE-LEMMON) An apparently asteroidal object discovered on CCD images obtained on Nov. 1 with the Mount Lemmon Survey's 1.5-m reflector (discovery observations tabulated below) has been found to show cometary appearance by CCD astrometrists elsewhere. 2022 UT R.A. (2000) Decl. Mag. Nov. 1.33158 5 48 34.26 +42 04 20.4 19.3 1.33675 5 48 34.23 +42 04 24.7 19.7 1.34191 5 48 34.34 +42 04 30.7 19.1 1.34707 5 48 34.40 +42 04 35.7 19.3 1.37943 5 48 34.69 +42 05 06.5 1.38472 5 48 34.75 +42 05 13.8 19.3 1.39009 5 48 34.75 +42 05 19.1 19.2 1.39549 5 48 34.88 +42 05 24.6 19.8 Twelve stacked 60-s exposures taken remotely on Nov. 2.37 UT by H. Sato (Bunkyo-ku, Tokyo, Japan) with a 0.43-m f/6.8 astrograph located at Mayhill, NM, USA, show a strongly condensed object with an outer coma 8" in diameter and no tail; the magnitude was 19.0 as measured within a circular aperture of radius 5".7. M. Jaeger notes that twenty-five 120-s exposures taken with a 0.3-m f/4 reflector at Oed, Austria, on Nov. 3.0 show a very condensed coma of size 7" and total mag 19.4 with a broad tail 20" long spanning p.a. 245-290 degrees. L. Buzzi, Varese, Italy, writes that one-hundred-seventy stacked 60-s exposures taken by F. Bellini with a 0.36-m f/7.5 reflector (and measured by A. Aletti and Bellini) on Nov. 5.0 show a softer aspect with respect to nearby stars, with a condensed coma 6" wide and a faint, straight tail 5" long in p.a. 270 degrees. E. Bryssinck, Kruibeke, Belgium, finds that twenty-five stacked and unfiltered 120-s exposures taken on Nov. 13.94 with a 0.4-m f/3.8 reflector show a diffuse object with a coma of size about 11" with a hint of a tail 9" long in p.a. 249 degrees; the magnitude was 19.0-19.3 as measured in an aperture of radius 5".5. S. Nakano, Central Bureau, then identified this object with an apparently asteroidal object of unknown brightness found in infrared images obtained on 2010 Jan. 28-30 (selected discovery observations tabulated below) with the Wide-field Infrared Survey Explorer earth-orbiting satellite (cf. IAUC 9118), which had been given the minor-planet designation 2010 BN_109 when announced on MPS 343780. 2010 UT R.A. (2000) Decl. Jan. 28.89310 2 26 39.71 +28 18 51.7 29.02541 2 26 45.51 +28 19 45.8 29.35623 2 26 59.33 +28 22 10.7 29.55475 2 27 07.86 +28 23 35.7 29.88558 2 27 22.18 +28 25 58.4 30.01801 2 27 27.68 +28 26 50.8 The available astrometry appears on MPEC 2022-W148. The following linked orbital elements by Nakano are from 156 observations spanning 2010-2022 (mean residual 0".5). There have been no recent close approaches to major planets. An orbit from 2022 observations alone (up to Nov. 15) produces residuals of -0.15 deg in R.A. and -0.22 deg in Decl. for the 2010 observations, with an indicated correction of Delta(T) = -0.81 day. Epoch = 2010 June 13.0 TT T = 2010 June 9.86156 TT Peri. = 70.56284 e = 0.5824017 Node = 43.10543 2000.0 q = 2.2708891 AU Incl. = 27.07837 a = 5.4379746 AU n = 0.07772278 P = 12.68 years Epoch = 2023 Feb. 25.0 TT T = 2023 Mar. 3.04773 TT Peri. = 70.83685 e = 0.5825023 Node = 42.89723 2000.0 q = 2.2783765 AU Incl. = 27.06775 a = 5.4572186 AU n = 0.07731202 P = 12.75 years Epoch = 2035 Dec. 19.0 TT T = 2035 Dec. 22.34020 TT Peri. = 71.66721 e = 0.5800813 Node = 42.19231 2000.0 q = 2.2892765 AU Incl. = 27.32773 a = 5.4517132 AU n = 0.07742916 P = 12.73 years Epoch = 2048 Oct. 11.0 TT T = 2048 Sept.23.67737 TT Peri. = 71.09010 e = 0.5788136 Node = 41.88029 2000.0 q = 2.3258528 AU Incl. = 27.31659 a = 5.5221455 AU n = 0.07595254 P = 12.98 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. These parameters would give a visual magnitude of 19-19.5 during the 2010 WISE infrared observations. Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag. 2022 11 07 05 49.05 +43 39.6 1.705 2.487 132.8 17.0 18.6 2022 11 17 05 47.05 +46 31.3 1.611 2.454 140.3 14.9 18.4 2022 11 27 05 41.07 +49 19.2 1.540 2.424 146.4 13.0 18.3 2022 12 07 05 31.36 +51 51.0 1.493 2.396 149.8 11.9 18.2 2022 12 17 05 18.97 +53 54.2 1.472 2.371 149.2 12.3 18.1 2022 12 27 05 05.86 +55 20.4 1.474 2.349 145.1 13.9 18.1 2023 01 06 04 54.58 +56 08.7 1.498 2.330 138.7 16.2 18.1 2023 01 16 04 47.26 +56 25.1 1.541 2.313 131.5 18.6 18.1 2023 01 26 04 45.19 +56 18.6 1.599 2.300 124.0 20.8 18.1 2023 02 05 04 48.75 +55 57.7 1.670 2.290 116.8 22.6 18.2 2023 02 15 04 57.59 +55 27.9 1.749 2.283 109.9 24.0 18.3 2023 02 25 05 11.05 +54 51.6 1.835 2.279 103.5 25.0 18.4 2023 03 07 05 28.37 +54 09.1 1.925 2.279 97.5 25.6 18.5 2023 03 17 05 48.70 +53 19.0 2.020 2.282 91.9 25.8 18.6 2023 03 27 06 11.28 +52 19.6 2.117 2.288 86.7 25.8 18.7 2023 04 06 06 35.37 +51 09.4 2.217 2.297 81.7 25.5 18.8 2023 04 16 07 00.29 +49 47.0 2.318 2.310 77.0 25.0 19.0 2023 04 26 07 25.51 +48 12.2 2.421 2.326 72.5 24.4 19.1 2023 05 06 07 50.56 +46 25.1 2.526 2.345 68.1 23.5 19.2 2023 05 16 08 15.10 +44 26.7 2.631 2.366 63.9 22.6 19.3 2023 05 26 08 38.93 +42 18.3 2.737 2.391 59.7 21.4 19.5 2023 06 05 09 01.90 +40 01.5 2.843 2.418 55.5 20.2 19.6 2023 06 15 09 23.94 +37 38.2 2.950 2.448 51.4 18.9 19.7 2023 06 25 09 45.08 +35 10.1 3.055 2.480 47.2 17.5 19.9 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 November 23 (CBET 5193) Daniel W. E. Green