UPSA Object Registry
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121P/Shoemaker-Holt 2

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
3.24 km
Semi-major axis
4.519 au
Eccentricity
0.204
Inclination
20.73°
Orbital period
9.61 y

Also known as

3 identifiers

121P121P/Shoemaker-Holt 2Shoemaker-Holt

Orbit and body

JPL Small-Body Database · solution by Otto Matic
ClassJFc
Semi-major axis a4.519 au
Eccentricity e0.204
Inclination i20.73°
Perihelion q / aphelion Q3.597 / 5.44 au
Period3,510 d (9.61 y)
Node Ω / argument ω / M95.96° / 18.02° / 167.89°
Earth MOID2.62 au
Absolute magnitude H—
Diameter3.24 km
Albedo—
Rotation period— h
Spectral type—
Observation arc1989-03-04 → 2026-05-13 · 772 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/121p-shoemaker-holt-2 · Registry entry updated 2026-08-14.