Astro Corner
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Celestial object
18 Melpomene (A852 MA)
18, 18 Melpomene (A852 MA), Melpomene
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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 designation18
JPL SPK-ID20000018
Orbit classMBA
Orbit IDJPL 140
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2461200.5
Eccentricity0.217848850933
Semi-major axis2.295822283 AU
Perihelion distance1.795680036 AU
Orbital period1,270.6 days
Earth MOID0.811855000 AU
Jupiter Tisserand3.543000
Inclination10.13101638°
Absolute magnitude · H6.3500
Diameter139.594000 km
Albedo0.181000
Last catalogue sync2026-09-11 01:40:05
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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Guides & knowledge
Published Guides that reference this canonical object.
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Images of this object
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