C/2023 P1 (Nishimura)

C/2023 P1 (Nishimura)
	Comet C/2023 P1 imaged from Spain on 25 August 2023
Discovery
Discovered by	Hideo Nishimura; (Kakegawa, Japan)
Discovery date	12 August 2023
Designations
MPC designation	C/2023 P1
Alternative designations	HN00003
Orbital characteristics
Observation arc	232 days (7.7 months)
Earliest precovery date	19 January 2023
Number of; observations	477
Aphelion	114 AU (1800); 110 AU (2200)
Perihelion	0.225 AU (33.7 million km; 87.6 LD); (73% of Mercury's perihelion)
Semi-major axis	57 AU; (comparable to Eris)
Eccentricity	0.9961 (1800); 0.9959 (2200)
Orbital period	≈431 years (inbound); ≈406 years (outbound)
Max. orbital speed	88.7 km/s @ perihelion
Inclination	132.5°
Longitude of; ascending node	66.8°
Argument of; periapsis	116.3°
Last perihelion	17 September 2023 15:24; ≈1588–1592
Next perihelion	≈2430 Feb
Earth MOID	0.078 AU (11.7 million km; 30 LD)
Jupiter MOID	2.3 AU (340 million km)
Comet total; magnitude (M1)	12.7

C/2023 P1 (Nishimura) is a long-period comet discovered by Hideo Nishimura on 12 August 2023.^[7] The comet passed perihelion on 17 September 2023 and reached an apparent magnitude of about 2.5.^[8]

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^ ^a ^b ^c Cite error: The named reference Perihelion was invoked but never defined (see the help page).
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^ Cite error: The named reference CBET5291 was invoked but never defined (see the help page).
^ Cite error: The named reference Perihelion2430 was invoked but never defined (see the help page).
^ Miller, Katrina (8 September 2023). "Don't Miss Comet Nishimura This Weekend, a Once-in-a-Lifetime View - For the next few mornings, just before sunrise, the cosmic snowball will glow green low on the horizon". The New York Times. Archived from the original on 9 September 2023. Retrieved 9 September 2023.
^ "Weekly Information about Bright Comets (2023 Dec. 9: North)". www.aerith.net. Retrieved 23 December 2023.

[CBET5285-1] Cite error: The named reference CBET5285 was invoked but never defined (see the help page).

[barycenter-2] Cite error: The named reference barycenter was invoked but never defined (see the help page).

[Perihelion-3] Cite error: The named reference Perihelion was invoked but never defined (see the help page).

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[Perihelion2430-6] Cite error: The named reference Perihelion2430 was invoked but never defined (see the help page).

[NYT-20230908-7] Miller, Katrina (8 September 2023). "Don't Miss Comet Nishimura This Weekend, a Once-in-a-Lifetime View - For the next few mornings, just before sunrise, the cosmic snowball will glow green low on the horizon". The New York Times. Archived from the original on 9 September 2023. Retrieved 9 September 2023.

[8] "Weekly Information about Bright Comets (2023 Dec. 9: North)". www.aerith.net. Retrieved 23 December 2023.

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Discovery^[1]
Comet C/2023 P1 imaged from Spain on 25 August 2023
Discovered by	Hideo Nishimura (Kakegawa, Japan)
Discovery date	12 August 2023
Designations
MPC designation	C/2023 P1
Alternative designations	HN00003
Orbital characteristics^[4]
Observation arc	232 days (7.7 months)
Earliest precovery date	19 January 2023
Number of observations	477
Aphelion	114 AU (1800)^[2] 110 AU (2200)
Perihelion	0.225 AU (33.7 million km; 87.6 LD)^[3] (73% of Mercury's perihelion)
Semi-major axis	57 AU (comparable to Eris)^[4]
Eccentricity	0.9961 (1800)^[2] 0.9959 (2200)
Orbital period	≈431 years (inbound)^[2] ≈406 years (outbound)
Max. orbital speed	88.7 km/s @ perihelion^[3]
Inclination	132.5°
Longitude of ascending node	66.8°
Argument of periapsis	116.3°
Last perihelion	17 September 2023 15:24^[3]^[4] ≈1588–1592^[5]^[2]
Next perihelion	≈2430 Feb^[6]
Earth MOID	0.078 AU (11.7 million km; 30 LD)^[4]
Jupiter MOID	2.3 AU (340 million km)
Comet total magnitude (M1)	12.7^[4]