Astro Corner
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Celestial object
C/2018 DO4 (Lemmon)
2018 DO4, C/2018 DO4 (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 DO4
JPL SPK-ID1003642
Orbit classHTC
Orbit IDJPL 40
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2458673.5
Eccentricity0.906954132114
Semi-major axis25.857708531 AU
Perihelion distance2.405952932 AU
Orbital period48,026.8 days
Earth MOID1.421020000 AU
Jupiter Tisserand-1.569000
Inclination160.47482073°
Absolute magnitude · H—
Comet total magnitude · M113.2000 · K1 6.5000
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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