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99P/Kowal

Periodic comet

Field	Value
name	99P/Kowal
discovery_ref
discoverer	Charles T. Kowal
discovery_site	Palomar Observatory
discovery_date	24 April 1977
mpc_name	P/1977 H2
P/1991 D2
designations
orbit_ref
epoch	17 October 2024 (JD 2460600.5)
observation_arc	47.25 years
obs	1,740
perihelion	4.702 AU
aphelion	7.489 AU
semimajor	6.095 AU
eccentricity	0.22857
period	15.049 years
inclination	4.339°
asc_node	28.083°
arg_peri	174.59°
mean	60.356°
tjup	2.956
Earth_moid	3.724 AU
Jupiter_moid	0.307 AU
physical_ref
mean_diameter	10.2 km
M1	6.7
M2	11.5
last_p	12 April 2022
next_p	6 May 2037

P/1991 D2

99P/Kowal, also known as Kowal 1, is a periodic comet in the Solar System that orbits out by Jupiter and has a 15 year orbital period. It has been observed regularly since 2019. Its most recent perihelion occurred in April 2022, and it is expected to return by May 2037.

Observational history

Charles T. Kowal discovered this comet shortly after reporting the discovery of asteroid 2063 Bacchus (then known as 1977 HB) on the night of 24 April 1977. It had already passed perihelion when it was first spotted as a 16th-magnitude object within the constellation Virgo. Orbital calculations by Shuichi Nakano and Brian G. Marsden predicted that the comet has a 15-year orbit around the Sun, and was expected to return by 1992. It was successfully recovered by James V. Scotti from the Kitt Peak Observatory's Spacewatch program on 21 February 1991.

Between 12 and 14 May 2021, a small outburst temporarily brightened Comet Kowal 1, which raised its apparent magnitude from 18.32 to 17.6.

References

| access-date= 6 July 2023 }} (JPL#65 Soln.date: 2023-Jul-05)

| access-date= 25 May 2025 }}

| access-date= 24 February 2019 }}

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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