87P/Bus

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87P/Bus
Comet 87P Bus u65z1f02r.fits.gz sci.jpg
Comet 87P/Bus photographed by the Hubble Space Telescope on 7 June 2001
Discovery [1]
Discovered by Schelte J. Bus
Discovery site UK Schmidt Telescope
Discovery date2 March 1981
Designations
P/1981 E1, P/1987 B4
  • 1981 XI, 1987 XXXIV
  • 1994 XVI
  • 1981b, 1987f, 1993b
Orbital characteristics [2] [3]
Epoch 31 May 2025 (JD 2459000.5)
Observation arc 39.57 years
Earliest precovery date9 February 1981
Number of
observations
801
Aphelion 4.776 AU
Perihelion 2.099 AU
Semi-major axis 3.438 AU
Eccentricity 0.38918
Orbital period 6.374 years
Inclination 2.603°
181.87°
Argument of
periapsis
24.932°
Mean anomaly 3.356°
Last perihelion9 May 2020
Next perihelion7 June 2029 [4]
TJupiter 3.009
Earth MOID 1.098 AU
Jupiter MOID 0.181 AU
Physical characteristics [5]
Mean radius
0.27±0.01 km
32.0±9.0 hours
Comet total
magnitude
(M1)
12.7
Comet nuclear
magnitude (M2)
16.1

87P/Bus is a periodic comet with a current orbital period of 6.37 years around the Sun.

Contents

Observational history

It was discovered by Schelte J. Bus in 1981 on a plate taken with the 1.2m UK Schmidt telescope at Siding Spring, Australia. The discovery was announced in IAU Circular 3578 on March 4, 1981. [1] It has been observed on each of its subsequent apparitions, most recently in 2020. [6]

Physical characteristics

Its nucleus is estimated to have an effective radius of 0.27±0.01 km and to be elongated, with an a/b ratio greater than 2.2. Its rotational period is estimated to be 32.0±9.0 hours. [5]

Orbit

A close approach to Jupiter on 13 May 1952, at a distance of 0.0668 AU (9.99 million km), lowered the orbital period from 12.46 years and the perihelion distance from 4.43 AU to 6.43 years and 2.13 AU respectively. Another close approach to Jupiter on 24 February 2023, at a distance of 0.182 AU (27.2 million km), raised the perihelion to 3.62 AU and the orbital period to 9.58 years. [7]

References

  1. 1 2 S. J. Bus; K. S. Russell (1 March 1981). D. W. Green (ed.). "Comet Bus (1981b)". IAU Circular. 3578 (1). Bibcode:1981IAUC.3578....1B. ISSN   0081-0304.
  2. "87P/Bus – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved 20 March 2016.
  3. "87P/Bus Orbit". Minor Planet Center . Retrieved 16 June 2014.
  4. "Horizons Batch for 87P/Bus (90000883) on 2029-Jun-07" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons . Retrieved 27 June 2022. (JPL#K203/18 Soln.date: 2020-Sep-28)
  5. 1 2 P. L. Lamy; I. Toth; H. A. Weaver; M. F. A'Hearn; L. Jorda (2011). "Properties of the nuclei and comae of 10 ecliptic comets from Hubble Space Telescope multi-orbit observations" (PDF). Monthly Notices of the Royal Astronomical Society. 412 (3): 1573–1590. doi: 10.1111/j.1365-2966.2010.17934.x .
  6. S. Yoshida. "87P/Bus". www.aerith.net. Retrieved 15 May 2015.
  7. K. Kinoshita (13 February 2014). "87P/Bus: Past, Present and Future orbital elements". Comet Orbit. Retrieved 13 November 2024.
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