Astro Corner
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Celestial object
C/2018 R3 (Lemmon)
2018 R3, C/2018 R3 (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 designation2018 R3
JPL SPK-ID1003586
Orbit classCOM
Orbit IDJPL 11
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2458538.5
Eccentricity0.999344905325
Semi-major axis1970.100091615 AU
Perihelion distance1.290602078 AU
Orbital period31,939,702.3 days
Earth MOID0.679202000 AU
Jupiter Tisserand0.491000
Inclination69.71541012°
Absolute magnitude · H—
Comet total magnitude · M111.3000 · K1 11.2500
Diameter—
Albedo—
Last catalogue sync2026-09-18 12:20:03
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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Published Guides that reference this canonical object.
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Images of this object
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