Astro Corner
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Celestial object
C/1917 F1 (Mellish)
1917 F1, C/1917 F1 (Mellish), Mellish
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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 designation1917 F1
JPL SPK-ID1000985
Orbit classHTC
Orbit IDJPL 3
Near-Earth objectYes
Potentially hazardousNo
Epoch · JD2421335.5
Eccentricity0.993029439410
Semi-major axis27.285690416 AU
Perihelion distance0.190196558 AU
Orbital period52,059.6 days
Earth MOID0.061888900 AU
Jupiter Tisserand0.645000
Inclination32.68628346°
Absolute magnitude · H—
Comet total magnitude · M110.9000 · K1 15.7500
Diameter—
Albedo—
Last catalogue sync2026-09-18 08:50:02
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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Published Guides that reference this canonical object.
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Images of this object
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