Astro Corner
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Celestial object
C/1989 T1 (Helin-Roman-Alu)
1989 T1, C/1989 T1 (Helin-Roman-Alu), Helin-Roman-Alu
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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 designation1989 T1
JPL SPK-ID1001241
Orbit classCOM
Orbit IDJPL 2
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2447847.5
Eccentricity0.990613991284
Semi-major axis111.582949199 AU
Perihelion distance1.047318534 AU
Orbital period430,521.8 days
Earth MOID0.374865000 AU
Jupiter Tisserand0.925000
Inclination46.03653761°
Absolute magnitude · H—
Comet total magnitude · M112.5000 · K1 13.7500
Diameter—
Albedo—
Last catalogue sync2026-09-18 09:10:02
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
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Images of this object
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