35P/Herschel-Rigollet
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| Discovery | |
|---|---|
| Discovered by: | Caroline Herschel & Roger Rigollet |
| Discovery date: | 1788-01-21 & 1939-07-28 |
| Alternate designations: | 35P/1788 Y1, 1788II Herschel |
| Orbital characteristics A | |
| Epoch: | 1939-08-05 |
| Aphelion distance: | 56,9386 AU |
| Perihelion distance: | 1.20 AU |
| Semi-major axis: | 28,8435 AU AU |
| Eccentricity: | 0.9741 |
| Orbital period: | 154.911 a |
| Inclination: | 64,207° |
| Last perihelion: | 1939-08-09 |
| Next perihelion: | 2092-03-16 |
35P/Herschel-Rigollet is a periodic comet discovered by Caroline Herschel (Slough, United Kingdom) on 1788-01-21.
Contents |
[edit] 1789 apparition
Caroline Herschel first observed the comet on 12th December 1788 and it was observed later that night by her brother William Herschel who described it as looking like a bright nebula and about 5-6 minutes in diameter, and much larger than the planetary nebula M57.
Through December and January the comet was observed by Nevil Maskelyne at the Greenwich Observatory and by Charles Messier at the Marine Observatory in Paris. Maskelyne was the last observer of the comet, his final observation taking place on 1789-02-05.
Similar possible orbits for the comet were calculated in 1789 by Pierre Méchain and in 1922 by Margaretta Palmer. Palmer considered that the orbit which best fitted the observations was an elliptical one with a period of 1,066 years.
[edit] 1939 apparition
Roger Rigollet (Lagny, France) rediscovered the comet on 1939-07-28; it was described as diffuse and with a magnitude of 8.0. The sighting was confirmed the next day by Alfonso Fresa of the Pino Torinese Observatory (Turin, Italy) and George van Biesbroeck of the Yerkes Observatory. The comet steadily faded after August, final (photographic) observations being obtained on 1940-01-16.
Following the 1939 rediscovery, the comets orbit was calculated by Jens P. Möller (Copenhagen, Denmark), and Katherine P. Kaster and Thomas Bartlett (Berkeley, USA). A perihelion date of 1939-08-09 was indicated. Based on these early orbits, Leland E. Cunningham of the Harvard College Observatory suggested that the comet was likely identical with Herschel's comet of 1788.
The final calculation of the orbit, by Brian G. Marsden in 1974, used 75 positions from both apparitions of the comet in 1788 and 1939-40 in addition to perturbations by planets, and linked the two sightings, with a perihelion date of 1939-08-09 and a period of 155 years.
[edit] Closest approaches to Earth
[edit] References
- 35P/Herschel-Rigollet. Gary W. Kronk's Cometography. Retrieved on 2008-02-02.
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