35P/Herschel–Rigollet

35P/Herschel–Rigollet
The comet on 14 August 1939, by Ferdinand Quénisset
Discovery
Discovered byCaroline Herschel & Roger Rigollet
Discovery date1788-12-21 & 1939-07-28
Designations
35P/1788 Y1, 1788II Herschel;
1939 O1, 1939 IX
Orbital characteristics
Epoch1939-08-05
Aphelion56.9 AU[1]
Perihelion0.74 AU
Semi-major axis28.843 AU
Eccentricity0.974
Orbital period155 yr[1]
Inclination64.207°
Last perihelion1939-08-09[1]
Next perihelion2092-Feb-13 (MPC)[2]
2092-Feb-17 (JPL)[3]
2092 Mar. 16[4]

35P/Herschel–Rigollet is a periodic comet with an orbital period of 155 years and an orbital inclination of 64 degrees. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).[1] It was discovered by Caroline Herschel (Slough, United Kingdom) on 21 December 1788. Given that the comet has a 155-year orbit[1] involving asymmetric outgassing, and astrometric observations in 1939 were not as precise as modern observations, predictions for the next perihelion passage in 2092 vary by about a month.

1789 apparition

Caroline Herschel first observed the comet on 21 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 Paris Observatory. Maskelyne was the last observer of the comet, his final observation taking place on 5 February 1789.

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.

1939 apparition

Roger Rigollet (Lagny, France) rediscovered the comet on 28 July 1939; it was described as diffuse and with a magnitude of 8.0. The sighting was confirmed the next day by Alfonso Fresa of the Observatory of Turin (Italy) and George van Biesbroeck of the Yerkes Observatory. The comet steadily faded after August, final (photographic) observations being obtained on 16 January 1940.

Following the 1939 rediscovery, the comet's orbit was calculated by Jens P. Möller (Copenhagen, Denmark), and Katherine P. Kaster and Thomas Bartlett (Berkeley, USA). A perihelion date of 9 August 1939 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 9 August 1939 and a period of 155 years.

Closest approaches to Earth

  • 4 November 1788 – 0.80 AU from Earth[5]
  • 30 July 1939 – 0.82 AU from Earth[5]

References

  1. ^ a b c d e "JPL Small-Body Database Browser: 35P/Herschel-Rigollet". Jet Propulsion Laboratory. 1940. Retrieved 2010-03-01.
  2. ^ "35P/Herschel-Rigollet Orbit". Minor Planet Center. Retrieved 2014-06-16.
  3. ^ "Horizons Batch for 35P/Herschel–Rigollet (90000442) on 2092-Feb-17" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 2021-04-11. Retrieved 2021-04-10.
  4. ^ Shuichi Nakano (2005-10-06). "35P/Herschel-Rigollet". OAA Computing and Minor Planet Sections. Retrieved 2009-10-04.
  5. ^ a b Kronk, Gary. "35P/Herschel-Rigollet". Gary W. Kronk's Cometography. Archived from the original on 20 December 2007. Retrieved 2008-02-02.


Numbered comets
Previous
34D/Gale 		35P/Herschel–Rigollet Next
36P/Whipple

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