Astro Corner
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Celestial object
121 Hermione (A872 JA)
121, 121 Hermione (A872 JA), Hermione
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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 designation121
JPL SPK-ID20000121
Orbit classOMB
Orbit ID148
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2461200.5
Eccentricity0.124448761950
Semi-major axis3.457772161 AU
Perihelion distance3.027456697 AU
Orbital period2,348.5 days
Earth MOID2.036440000 AU
Jupiter Tisserand3.108000
Inclination7.56550480°
Absolute magnitude · H7.3900
Diameter209.000000 km
Albedo0.048200
Last catalogue sync2026-09-11 01:40:07
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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