Astro Corner
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Celestial object
291 Alice (A890 HA)
291, 291 Alice (A890 HA), Alice
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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 designation291
JPL SPK-ID20000291
Orbit classMBA
Orbit IDJPL 71
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2461200.5
Eccentricity0.092595681957
Semi-major axis2.221999322 AU
Perihelion distance2.016251780 AU
Orbital period1,209.8 days
Earth MOID1.030710000 AU
Jupiter Tisserand3.642000
Inclination1.85735819°
Absolute magnitude · H11.5400
Diameter10.456000 km
Albedo0.425000
Last catalogue sync2026-09-12 01:00:07
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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Guides & knowledge
Published Guides that reference this canonical object.
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Images of this object
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