Astro Corner
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Celestial object
208P/McMillan
208P, 208P/McMillan, McMillan
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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 designation208P
JPL SPK-ID1003003
Orbit classJFc
Orbit IDJPL 44
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2456888.5
Eccentricity0.372046674351
Semi-major axis4.049708083 AU
Perihelion distance2.543027659 AU
Orbital period2,976.7 days
Earth MOID1.538520000 AU
Jupiter Tisserand2.918000
Inclination4.40940087°
Absolute magnitude · H—
Comet total magnitude · M116.1000 · K1 4.5000
Diameter—
Albedo—
Last catalogue sync2026-09-18 11:30:02
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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Published Guides that reference this canonical object.
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Images of this object
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