Astro Corner
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Celestial object
391P/Kowalski
391P, 391P/Kowalski, Kowalski
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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 designation391P
JPL SPK-ID1002328
Orbit classJFc
Orbit IDJPL 34
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2455004.5
Eccentricity0.119012415901
Semi-major axis4.676315440 AU
Perihelion distance4.119775842 AU
Orbital period3,693.6 days
Earth MOID3.105440000 AU
Jupiter Tisserand2.867000
Inclination21.27496136°
Absolute magnitude · H—
Comet total magnitude · M19.9000 · K1 10.0000
Diameter—
Albedo—
Last catalogue sync2026-11-08 07:10:02
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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Published Guides that reference this canonical object.
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Images of this object
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