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Comet 398P/BOATTINI - P/2020 P2  = P/2009 Q4 (BOATTINI)

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

------------  -------------------  -----  -----  -----  -----  -----  -----  ----  ----  ---

P/2009 Q4     14/09/2020 00:44:04  17.31  16.82  16.63  16.34  16.29          5.6  17.0  B96

P/2009 Q4     14/09/2020 00:44:04*  0.11   0.20   0.13   0.11   0.03            2   3.3  Gai

398P          05/11/2020 00:05:27  15.76  14.99  14.67  14.49  14.39  14.31  10.1  16.6  B96

398P          05/11/2020 00:05:27*  0.18   0.16   0.13   0.14   0.14   0.16     3   3.9  Gai

398P          05/03/2021 22:46:50  17.16  16.43  16.09  16.05  16.13          4.1  17.9  B96

398P          05/03/2021 22:46:50*  0.07   0.08   0.02   0.09   0.12            3   3.4  Gai

                                                                     AFRHO         LOG

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

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

P/2009 Q4     14/09/2020 00:44:04    0.96   1.73  28.86  16.61    6      6     1  0.775  B96

398P          05/11/2020 00:05:27    0.50   1.43  54.75  14.28   10     10     1  0.986  B96

398P          05/03/2021 22:46:50    0.77   1.52  36.05  16.15    4      5     1  0.653  B96

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: ( IAUC 9069 )

Andrea Boattini discovered a 19th magnitude comet during the Catalina Sky Survey with the 0.68m Schmidt on August 26.47. Several amateur observers confirmed the cometary nature. The comet will reach perihelion at 1.3 AU in mid November and has a period of 5.6 years.

Recovery:

Recovery of comet P/2009 Q4 (BOATTINI): N. Erasmus, South African Astronomical Observatory, reported his discovery of a comet on CCD images taken with a 0.5-m f/2 Schmidt reflector at Mauna Loa, Hawaii, in the in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program , the object noted as having a diffuse coma (FWHM size being 6" in 4" seeing) extended about 15" toward p.a. 260 degrees.

The object was immediately posted on the Minor Planet Center's page.  H. Sato, Tokyo, Japan, noted that this appears to be a recovery of P/2009 Q4 (cf. IAUCs 9069, 9081) when he sent his follow-up observations composed of twenty stacked 60-s exposures taken remotely on Aug. 12.43 UT with a 0.43-m f/6.8 astrograph located near Mayhill, NM, USA.  Sato found that the comet was strongly condensed with a coma 10" in diameter, and there was a 15" tail toward p.a. 270 degrees; the magnitude was 19.3 as measured within a circular aperture of radius 5".7.