Lick Object of 1921

X/1921 P1 (Lick)
Discovery[1]
Discovered byWilliam W. Campbell
Discovery siteLick Observatory
Discovery date7 August 1921
Orbital characteristics[2]
Observation arc1 day
Perihelion~0.25 AU
Physical characteristics[3]
–2.0
(1921 apparition)

The Lick Object of 1921 is an unidentified astronomical object that was observed from the Lick Observatory in August 1921. Although follow-up observations were not successfully conducted, it is hypothesized that this object is highly likely a non-periodic comet.[2]

Observational history

William Wallace Campbell reported the sighting of a star-like object about three degrees from the Sun on the evening of 7 August 1921.[4][1] Observers noted that the object was as bright as Venus, reaching an apparent magnitude of –2 at its maximum.[3] A possibility that it was a nova explosion was ruled out due to its high relative position (about 40 degrees) to the Galactic plane.[a]

Zdenek Sekanina and Rainer Kracht published a study in 2016 where they concluded that the Lick object is highly likely a fragment of the same parent body as the comet C/1847 C1 (Hind).[2] Their findings suggested that the Lick Object and C/1847 C1 split from a parent body sometime during their perihelion on the 7th millennium BC at a relative velocity of ~1.0–1.5 m/s (3.3–4.9 ft/s).[2]

References

Notes

  1. ^ Reported initial position upon discovery was: α = 9h 22m , δ = 15.5°[4]

Citations

  1. ^ a b S. I. Bailey (9 August 1921). "Bright Object near Sun". Harvard College Observatory Bulletin. 757.
  2. ^ a b c d Z. Sekanina; R. Kracht (2016). "Pairs and Groups of Genetically Related Long-Period Comets and Probable Identity of the Mysterious Lick Object of 1921". The Astrophysical Journal. 823 (1). arXiv:1510.06445. doi:10.3847/0004-637X/823/1/2.
  3. ^ a b J. A. Pearce (1921). "The Unidentified Bright Object Seen Near the Sun, August 7, 1921". Journal of the Royal Astronomical Society of Canada. 15: 364–367. Bibcode:1921JRASC..15..364P.
  4. ^ a b W. W. Campbell. "Observations of an Unidentified Object Seen Near the Sun on Sunday, August 7, 1921" (PDF). Publications of the Astronomical Society of the Pacific. 33 (195): 258–260. JSTOR 40668524.
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