Astro Corner
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Celestial object
C/2023 S3 (Lemmon)
2023 S3, C/2023 S3 (Lemmon), Lemmon
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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 designation2023 S3
JPL SPK-ID1003954
Orbit classHTC
Orbit IDJPL 18
Near-Earth objectYes
Potentially hazardousNo
Epoch · JD2460300.5
Eccentricity0.970840295154
Semi-major axis28.469320338 AU
Perihelion distance0.830156978 AU
Orbital period55,483.5 days
Earth MOID0.218296000 AU
Jupiter Tisserand-0.683000
Inclination140.49801928°
Absolute magnitude · H—
Comet total magnitude · M116.3000 · K1 9.0000
Diameter—
Albedo—
Last catalogue sync2026-09-18 12:50:02
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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