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Comet 99P/KOWAL -  = C/1977 H2 (KOWAL)

99P on Cometography

Observation date

image

Photometry

(FOCAS)

Afρ

astrometry

Observatory

20210412

X

X


X

B96 - BRIXIIS

20210416

X

X


X

B96 - BRIXIIS

















































Data obtained by use of  FOCAS-II software


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

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

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

99P           12/04/2021 21:26:05  18.14  17.75  17.49  17.18  17.02  16.84   6.8  18.2  B96

99P           12/04/2021 21:26:05*  0.04   0.03   0.15   0.14   0.02   0.03     2   3.8  Gai

99P           16/04/2021 21:36:19  18.30  18.23  18.13  18.08                 5.8  17.9  B96

99P           16/04/2021 21:36:19*  0.30   0.45   0.34   0.40                   3   3.6  Gai



                                                                     AFRHO         LOG

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

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

99P           12/04/2021 21:26:05    4.15   4.90   6.64  18.50    7    158    23  2.200  B96

99P           16/04/2021 21:36:19    4.20   4.90   6.57  18.38    6    180    31  2.256  B96



Discovery:


Charles T. Kowal (Palomar Observatory, California, USA) discovered this comet on a photographic plate exposed with the 122-cm Schmidt telescope on 1977 April 24.39. He estimated the magnitude as 16 to 17, and described the comet as diffuse with some condensation and a tail extending 2 arc minutes toward the northeast. It was then in Virgo. Images also appeared on plates exposed with the same telescope on the 25th and 26th.


The comet was already passed perihelion when found in 1977 and remained visible until June 17, when near magnitude 19.

Using observations obtained from April 24 through May 19, B. G. Marsden computed an elliptical orbit with a period of 18.6 years. As further observations were obtained the period was revised. During 1979 Marsden gave the period as 15.11 years and said the short observational arc brought about an uncertainty of about 2 weeks


Charles Thomas Kowal (November 8, 1940 – November 28, 2011) was an American astronomer known for his observations and discoveries in the Solar System. Kowal also discovered or co-discovered the periodic comets 99P/Kowal, 104P/Kowal, 134P/Kowal-Vavrova, 143P/Kowal-Mrkos, and 158P/Kowal-LINEAR.  He was awarded the James Craig Watson Medal for his contributions to astronomy in 1979.