C/1998 J1 (SOHO)

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C/1998 J1 (SOHO)
Discovery [1]
Discovered by SOHO
S. Stezelberger
Discovery date3 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 perihelion8 May 1998
Earth MOID 0.316 AU
Jupiter MOID 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 a hyperbolic comet discovered from the edge of SOHO'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 the Sun. [6]

Contents

Observational history

S. Stezelberger first spotted the comet from a series of photographs taken by the LASCO-C3 instrument of the Solar and Heliospheric Observatory on 3 May 1998, [4] making it the spacecraft's 49th comet discovery since January 1996. [2]

Nicolas Biver and H. Dahle made the first ground observations of the comet from Oahu, 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 the Pleiades cluster, allowing Jost Jahn to perform astrometry measurements. [7] Earlier, on 9 May 1998, Alan Hale, Gary W. Kronk and Mauro V. Zanotta also attempted ground observations but failed to find the comet. [4]

References

  1. ↑ B. G. Marsden (5 May 1998). "Comet C/1998 J1 (SOHO)". International Astronomical Union Circular. 6894.
  2. 1 2 "SOHO Non-Group Comets". The Sungrazer Project. Archived from the original on April 22, 2021. Retrieved 18 February 2025.
  3. ↑ "C/1998 J1 (SOHO) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved 17 February 2025.
  4. 1 2 3 G. W. Kronk. "C/1998 J1 (SOHO)". Cometography.com. Retrieved 17 February 2025.
  5. ↑ M. Mattiazzo. "The Great Binocular Comet of 1998". Southern Comets Homepage. Retrieved 17 February 2025.
  6. 1 2 A. Kammerer. "Analysis of Past Comet Apparitions: C/1998 J1 (SOHO)". Fachgruppe Kometen. Retrieved 17 February 2025.
  7. 1 2 B. G. Marsden (16 May 1998). "Comet C/1998 J1 (SOHO)". International Astronomical Union Circular. 6906. Bibcode:1998IAUC.6906....1B.
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