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Comet 28P/NEUJMIN

Photometric data obtained by use of FOCAS-II software

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

OBJECT        DATE       TIME        +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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

28P           28/10/2021 00:02:52  17.11  17.13  17.14  17.09  16.86  16.49   9.5  18.1  B96

28P           28/10/2021 00:02:52*  0.02   0.10   0.07   0.11   0.25   0.20     3   4.0  Gai

                                                                     AFRHO         LOG

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

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

28P           28/10/2021 00:02:52    2.23   2.96  12.37  17.20   10     55     6  1.742  B96

Comet 28P on Kronk’s cometography

   G. N. Neujmin (Simeis Observatory, Crimea, Ukraine) discovered this object on a photograph exposed on 1913 September 3.98, during a routine search for minor planets. The object was stellar and of magnitude 10.0. It was announced by Neujmin as a new minor planet. Kudrewisch (Pulkovo Observatory, Saint Petersburg, Russia) photographically confirmed the new object on September 5.91 and gave the magnitude as 10.8. On September 7, J. O. Backlund (Pulkovo Observatory) announced that Neujmin's minor planet was actually a comet, while K. Graff (Hamburg Observatory, Bergedorf, Germany) came to the same conclusion when he detected a short tail on September 7.10.  The comet had passed perhihelion about 3 weeks prior its discovery and had passed closest to earth just over a day earlier.  On sept. 8th, tha magnitude was given as 10.8-11 by J. Van der Bilt (Utrecht, Netherlands)