| Discovery[1] | |
|---|---|
| Discovered by | SOHO S. Stezelberger |
| Discovery date | 3 May 1998 |
| Designations | |
| SOHO-49[2] | |
| Orbital characteristics[3] | |
| Epoch | 9 June 1998 (JD 2450973.5) |
| Observation arc | 94 days |
| Number of observations | 318 |
| Perihelion | 0.153 AU |
| Eccentricity | 1.00017 |
| Inclination | 62.932° |
| 351.65° | |
| Argument of periapsis | 110.56° |
| Mean anomaly | 0.0012° |
| Last perihelion | 8 May 1998 |
| EarthMOID | 0.316 AU |
| JupiterMOID | 3.143 AU |
| Physical characteristics[4] | |
| Comet total magnitude (M1) | 6.5 |
| Comet nuclear magnitude (M2) | 10.0 |
| 0.0 (1998 apparition) | |
C/1998 J1 (SOHO) is ahyperbolic comet discovered from the edge ofSOHO's LASCO-C3 field-of-view on 3 May 1998.[5] It is one of the few small comets observed by SOHO that has survived its close encounter with theSun.[6]
S. Stezelberger first spotted the comet from a series of photographs taken by the LASCO-C3 instrument of theSolar and Heliospheric Observatory on 3 May 1998,[4] making it the spacecraft's 49th comet discovery since January 1996.[2]
Nicolas Biver andH. Dahle made the first ground observations of the comet fromOahu, Hawaii on 11 May 1998.[7] They reported that the comet was an extremely condensed object around magnitude 0.5 in brightness.[6] At the time, the comet was positioned near thePleiades cluster, allowingJost Jahn to performastrometry measurements.[7] Earlier, on 9 May 1998,Alan Hale,Gary W. Kronk andMauro V. Zanotta also attempted ground observations but failed to find the comet.[4]
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