1P/Halley
The comet that made comets predictable, recorded on every return since at least 240 BC.
Where it is right now
1P/Halley is in Hydra, 36.2 AU away.
Computed for 2 August 2026, 17:00 UTC, and recomputed at least hourly. This page is cached, so treat the line above as accurate to the hour rather than to the second. The map shows the live position.
Position from a Kepler propagation of the published elements below, accurate to about an arcminute.
Facts
Every line carries the source it came from.
- Diameter
- 11 kmSource: NASA/JPL Small-Body Database
- Orbital period
- 75.9 yearsSource: NASA/JPL Small-Body Database
- Distance from the Sun
- 17.929 AU on averageSource: NASA/JPL Small-Body Database
- Orbit shape
- eccentricity 0.968, inclined 162.2 degrees to the eclipticSource: NASA/JPL Small-Body Database
- Class
- Halley-type cometSource: NASA/JPL Small-Body Database
- Discovered
- 1758-Dec-25 by Palitzsch, Johann GeorgSource: NASA/JPL Small-Body Database
Physical size
- Mean radius
- 5.5 km
- Diameter
- 11 km across
Orbit
Elements are heliocentric, referred to the J2000.0 ecliptic.
- Average distance from the Sun
- 17.929 AU (2,682.1 million km)
- Closest and furthest
- 0.575 AU (86.00 million km) to 35.282 AU (5,278.2 million km)
- Eccentricity
- 0.9679, extremely elongated
- Inclination to the ecliptic
- 162.19 degrees
- Orbital period
- 75.9 years (27,728 days)
- Longitude of ascending node
- 59.10 degrees
- Argument of periapsis
- 112.24 degrees
- Mean anomaly at J2000.0
- 65.89 degrees
Claim this body
$149 per year
Rides its real orbit on a highly elliptical path, and sweeps the inner system at perihelion. Leased annually.
Wave 3 is not open yet, so this body is not for sale today. Wave 1 is.
A claim is a listing on this map. Not an IAU designation. Permanent, with one disclosed exception for dead links: see the terms.
Catalog id halley. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.