117P/Helin–Roman–Alu, also known as Helin–Roman–Alu 1, is a Jupiter-family comet with an 8.38-year orbit around the Sun. It is also classified as a quasi-Hilda comet. It is the second of three comets co-discovered by Eleanor F. Helin, Brian P. Roman, and Jeff Alu.
Physical characteristics Preliminary estimates by James V. Scotti in 1994 revealed that the nucleus of Comet Helin–Roman–Alu 1 is roughly in diameter. Later estimates in 2005 revealed a much larger nucleus at approximately , though it is highly likely that the strong activity seen from the comet at the time were contaminating the data obtained.
See also Comet Helin
Notes
References
External links
at the Minor Planet Center database 117P/Helin–Roman–Alu at Gary W. Kronk's Cometography 117P/Helin–Roman–Alu at Roger Groom's website 117P/Helin–Roman–Alu at Seiichi Yoshida's website