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Comet 449P/LEONARD - (P/2020 S6 = X/1987 A2 = P/2013 Y3)

Photometric data obtained from FOCAS-II software

COD B96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

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FoCAs 3.66

www.astrosurf.com/cometas-obs

es.groups.yahoo.com/group/Cometas_Obs

Af(rho) data according the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

Discovery

object X/1987 A2 Hartley as possible comet IAUC 4355

R. H. McNaught, Siding Spring Observatory, communicates the discovery by Malcolm Hartley of a possible comet on a single plate taken on 1987 5 Jan. with the 1.2-m Schmidt telescope.  The object has a 2' tail to the northwest.  The direction of motion is uncertain:

Recovery:  CBET 4868

COMET P/2020 S6 = P/1987 A2 = P/2013 Y3 (LEONARD)

Recovery P/2020 S6 (Leonard) - MPEC 2020-U151 : COMET P/2020 S6 (Leonard)

Gregory Leonard discovered a comet of 21st magnitude in images taken with the 1.5m reflector on September 29.40 during the Mt Lemmon Survey. It was placed on the PCCP as C3D5RV2. There were pre-discovery images for August 28 and September 18 from Mt Lemmon and for September 22 from PanSTARRS 2.  [CBET 4868, MPEC 2020-U151, 2020 October 21]. The comet is at perihelion at 1.9 au in 2020 November and has a period of 6.8 years. The comet passed about 0.076 au (range 0.07 to 0.23 according to JPL) from Jupiter in 1983 July.

In 2022 October Maik Meyer linked the comet to a comet discovered by Malcolm Hartley on a plate taken on 1987 January 5.73 with the 1.22m Southern Schmidt at Siding Spring. The comet was not found on the plate until March, so there were no follow up observations, and with only one plate the direction of motion was ambiguous so it was given an X/ designtion. Sam Dean was then able to find observations of the comet made with the 3.58m Canada-France-Hawaii telescope on 2013 December 29.30 and 2014 January 3. [MPEC 2022-T74, CBET 5173, 2022 October 5]

CBET 5173 : 20221006 : COMET P/2020 S6 = P/1987 A2 = P/2013 Y3 (LEONARD)

See also: CBET 5227:  NEW NUMBERINGS OF SHORT-PERIOD COMETS