UPSA Object Registry
Registry · solar system

1P/Halley

Comet
Diameter
11 km
Semi-major axis
17.93 au
Eccentricity
0.9679
Inclination
162.2°
Orbital period
75.84 y
Albedo
0.04

Also known as

3 identifiers

1P1P/HalleyHalley

Orbit and body

JPL Small-Body Database · solution by Davide Farnocchia
ClassHTC · near-Earth
Semi-major axis a17.93 au
Eccentricity e0.9679
Inclination i162.19°
Perihelion q / aphelion Q0.575 / 35.28 au
Period27,700 d (75.84 y)
Node Ω / argument ω / M59.1° / 112.24° / 274.38°
Earth MOID0.0745 au
Absolute magnitude H—
Diameter11 km
Albedo0.04
Rotation period— h
Spectral type—
Observation arc1835-08-21 → 1994-01-11 · 8,518 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/1p-halley · Registry entry updated 2026-08-14.