Astro Corner
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Celestial object
31P/Schwassmann-Wachmann 2
31P, 31P/Schwassmann-Wachmann 2, Schwassmann-Wachmann
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Reference data
RADate-dependentMoving object · use an ephemeris
DecDate-dependentMoving object · use an ephemeris
Magnitude—
Angular size—
Position angle—
Distance—
Constellation—
Solar System catalogue
JPL SBDBMoving-object reference
Comets and minor planets move against the background sky. Astro Corner therefore keeps their orbital catalogue record separately and does not pretend a single RA/Dec is permanently correct.
Primary designation31P
JPL SPK-ID1000080
Orbit classJFc
Orbit IDJPL K284/8
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2455736.5
Eccentricity0.193204502682
Semi-major axis4.244222446 AU
Perihelion distance3.424219559 AU
Orbital period3,193.7 days
Earth MOID2.439390000 AU
Jupiter Tisserand2.993000
Inclination4.54614034°
Absolute magnitude · H—
Comet total magnitude · M14.8000 · K1 21.7500
Diameter6.200000 km
Albedo—
Last catalogue sync2026-11-08 04:10:02
Planning coordinates are intentionally separate.A later Horizons ephemeris layer can calculate the object's apparent position for a specific date, time and observing location. Until then, static-sky tools are hidden for this record rather than showing misleading coordinates.
Open JPL Small-Body Database 
Reference transparencySources & data provenanceSee where catalogue identities and imported reference fields came from.4 records
Community observations
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Images of this object
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