Astro Corner
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Celestial object
421P/McNaught
421P, 421P/McNaught, McNaught
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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 designation421P
JPL SPK-ID1003047
Orbit classJFc
Orbit IDJPL 19
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2455509.5
Eccentricity0.675383995126
Semi-major axis5.080471905 AU
Perihelion distance1.649202493 AU
Orbital period4,182.7 days
Earth MOID0.672207000 AU
Jupiter Tisserand2.459000
Inclination10.09447770°
Absolute magnitude · H—
Comet total magnitude · M113.7000 · K1 13.2500
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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Images of this object
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