132P/Helin–Roman–Alu

132P/Helin–Roman–Alu, also known as Helin–Roman–Alu 2, is a Jupiter-family comet with a 7.68-year orbit around the Sun. It is the third of three comets co-discovered by Eleanor F. Helin, Brian P. Roman, and Jeff Alu.^[b]

Discoveredby

• Eleanor F. Helin
• Brian P. Roman
• Jeff Alu

Discoverydate26 October 1989

MPCdesignation

P/1989 U1, P/1997 N2

Alternative designations

• Helin–Roman–Alu 2^[2]
• 1989 XVI, 1989y

Quick facts Discovery, Discovered by ...

132P/Helin-Roman-Alu

Comet Helin–Roman–Alu 2 imaged from the Zwicky Transient Facility on 4 October 2021
Discovery[1]
Discovered by	Eleanor F. Helin Brian P. Roman Jeff Alu
Discovery date	26 October 1989
Designations
MPC designation	P/1989 U1, P/1997 N2
Alternative designations	Helin–Roman–Alu 2[2] 1989 XVI, 1989y
Orbital characteristics[3][4]
Epoch	21 November 2025 (JD 2461000.5)
Observation arc	32.43 years[a]
Number of observations	1,566
Aphelion	6.088 AU
Perihelion	1.698 AU
Semi-major axis	3.893 AU
Eccentricity	0.56380
Orbital period	7.681 years
Inclination	5.376°
Longitude of ascending node	173.97°
Argument of periapsis	216.52°
Mean anomaly	188.53°
Last perihelion	13 November 2021
Next perihelion	19 July 2029[5]
TJupiter	2.759
Earth MOID	0.699 AU
Jupiter MOID	0.015 AU
Physical characteristics[3]
Mean radius	0.89 km (0.55 mi)[6]
Mean density	410±60 kg/m3[7]
Comet total magnitude (M1)	10.2
Comet nuclear magnitude (M2)	15.1

Close