Halley's Comet

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1P/Halley (Halley's Comet)
Halley's comet
Halley's Comet on 8 Mairch 1986
Discovered biPrehistoric observation;
Edmond Halley (recogneetion o periodicity)
Orbital chairactereestics[2]
Epoch 2449400.5
(17 Februar 1994)
Aphelion35.1 AU
(9 December 2023)[1]
Perihelion0.586 AU
last perihelion: 9 Februar 1986
next perihelion: 28 Julie 2061[1]
17.8 AU
75.3 a[2]
Pheesical chairacteristics
Dimensions15×8 km,[3] 11 km (mean diameter)[2]
Mass2.2×1014 kg[4]
Mean density
0.6[5] (estimates range from 0.2 to 1.5 g/cm3[6])
~0.002 km/s
2.2 d (52.8 h) (?)[7]
28.2 (in 2003)[9]

Halley's Comet or Comet Halley (named efter astronomer Edmond Halley), offeecially designatit 1P/Halley,[2] is a short-period comet veesible frae Yird every 75–76 years.[2][10] Halley is the anly kent short-period comet that is regularly veesible tae the naked ee frae Yird, an the anly naked-ee comet that micht appear twice in a human lifetime.[11] Halley last appeared in the inner pairts o the Solar Seestem in 1986 an will next appear in mid-2061.[12]

References[eedit | eedit soorce]

  1. 1.0 1.1 Donald K. Yeomans. "Horizon Online Ephemeris System". California Institute of Technology, Jet Propulsion Laboratory. Retrieved 8 September 2006.
  2. 2.0 2.1 2.2 2.3 2.4 "JPL Small-Body Database Browser: 1P/Halley" (11 January 1994 last obs). Jet Propulsion Laboratory. Retrieved 13 October 2008.
  3. "What Have We Learned About Halley's Comet?". Astronomical Society of the Pacific (No. 6 – Fall 1986). 1986. Retrieved 16 December 2008.
  4. G. Cevolani; G. Bortolotti; A. Hajduk (1987). "Halley, comet's mass loss and age". Il Nuovo Cimento C. Italian Physical Society. 10 (5): 587–591. Bibcode:1987NCimC..10..587C. doi:10.1007/BF02507255.
  5. R. Z. Sagdeev; P. E. Elyasberg; V. I. Moroz. (1988). "Is the nucleus of Comet Halley a low density body?". Nature. 331 (6153): 240–242. Bibcode:1988Natur.331..240S. doi:10.1038/331240a0.
  6. S. J. Peale (1989). "On the density o Halley's comet". Icarus. 82 (1): 36–49. Bibcode:1989Icar...82...36P. doi:10.1016/0019-1035(89)90021-3. densities obtained by this procedure are in reasonable agreement with intuitive expectations of densities near 1 g/cm3, the uncertainties in several parameters and assumptions expand the error bars so far as to make the constraints on the density uniformative ... suggestion that cometary nuclei tend to by very fluffy, ... should not yet be adopted as a paradigm of cometary physics.
  7. S. J. Peale; J. J. Lissauer (1989). "Rotation of Halley's Comet". Icarus. 79 (2): 396–430. Bibcode:1989Icar...79..396P. doi:10.1016/0019-1035(89)90085-7.
  8. R. R. Britt (29 November 2001). "Comet Borrelly Puzzle: Darkest Object in the Solar System". Space.com. Retrieved 16 December 2008.
  9. "New Image of Comet Halley in the Cold". European Southern Observatory. 1 September 2003. Retrieved 22 February 2009.
  10. G. W. Kronk. "1P/Halley". cometography.com. Retrieved 13 October 2008.
  11. M. Delehanty. "Comets, awesome celestial objects". AstronomyToday. Retrieved 15 March 2007.
  12. O. Ajiki; R. Baalke. "Orbit Diagram (Java) of 1P/Halley". Jet Propulsion Laboratory Solar System Dynamics. Retrieved 1 August 2008.