Cometcountdown

117P/Helin-Roman-Alu 1
Discovered by
Eleanor F. Helin, Brian P. Roman, Jeff Alu
Discovery date
2 October 1989
Alternative designations
1987 XXXVII
Semi-major axis
4.08 AU
Eccentricity
0.2556
Orbital period
8.24 a
Inclination
8.7080°
Epoch
6 March 2006
Aphelion
5.123 AU
Perihelion
3.037 AU
Last Perihelion(s)
27 March 2014 - 19 December 2005
Next Perihelion
7 July 2022
Last modified
17/12/2016 - 07:10