Astro Corner
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Celestial object
C/2017 A3 (Elenin)
2017 A3, C/2017 A3 (Elenin), Elenin
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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 designation2017 A3
JPL SPK-ID1003493
Orbit classCOM
Orbit IDJPL 13
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2457794.5
Eccentricity0.911076163379
Semi-major axis43.346563032 AU
Perihelion distance3.854542689 AU
Orbital period104,239.0 days
Earth MOID3.218270000 AU
Jupiter Tisserand-0.232000
Inclination98.50847737°
Absolute magnitude · H—
Comet total magnitude · M19.7000 · K1 10.0000
Diameter—
Albedo—
Last catalogue sync2026-09-18 12:10:02
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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Guides & knowledge
Published Guides that reference this canonical object.
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Images of this object
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