Astro Corner
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Celestial object
151P/Helin
151P, 151P/Helin, Helin
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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 designation151P
JPL SPK-ID1000115
Orbit classJFc
Orbit IDJPL 35
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2455249.5
Eccentricity0.570893845473
Semi-major axis5.807247383 AU
Perihelion distance2.491925593 AU
Orbital period5,111.6 days
Earth MOID1.489650000 AU
Jupiter Tisserand2.625000
Inclination4.73471503°
Absolute magnitude · H—
Comet total magnitude · M18.5000 · K1 21.7500
Diameter8.400000 km
Albedo—
Last catalogue sync2026-09-18 07:40:03
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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