UPSA Object Registry
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117P/Helin-Roman-Alu 1

Comet
harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.
Diameter
9 km
Semi-major axis
4.096 au
Eccentricity
0.2538
Inclination
8.7°
Orbital period
8.296 y

Also known as

3 identifiers

117P117P/Helin-Roman-Alu 1Helin-Roman-Alu

Orbit and body

JPL Small-Body Database · solution by Davide Farnocchia
ClassJFc
Semi-major axis a4.096 au
Eccentricity e0.2538
Inclination i8.7°
Perihelion q / aphelion Q3.056 / 5.14 au
Period3,030 d (8.296 y)
Node Ω / argument ω / M58.9° / 222.69° / 356.53°
Earth MOID2.05 au
Absolute magnitude H—
Diameter9 km
Albedo—
Rotation period— h
Spectral type—
Observation arc2003-11-30 → 2026-01-18 · 6,500 observations

Provenance

where this card came from
ArchiveRead at (UTC)Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/117p-helin-roman-alu-1 · Registry entry updated 2026-08-14.