Astro Corner
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Celestial object
C/1973 A1 (Heck-Sause)
1973 A1, C/1973 A1 (Heck-Sause), Heck-Sause
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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 designation1973 A1
JPL SPK-ID1001150
Orbit classHYP
Orbit IDJPL 2
Near-Earth objectNo
Potentially hazardousNo
Epoch · JD2441743.5
Eccentricity1.000573187342
Semi-major axis-4380.958906277 AU
Perihelion distance2.511110189 AU
Orbital period—
Earth MOID1.527260000 AU
Jupiter Tisserand—
Inclination138.63014975°
Absolute magnitude · H—
Comet total magnitude · M15.5000 · K1 10.2500
Diameter—
Albedo—
Last catalogue sync2026-09-18 09:00:03
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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