84 Klio

84 Klio
Orbital diagram
Discovery
Discovered byKarl Theodor Robert Luther
Discovery date25 August 1865
Designations
(84) Klio
Pronunciation/ˈklaɪ.oʊ/[1]
Named after
Clio
Main belt · Klio
AdjectivesKlionian /klaɪˈoʊniən/
Klioian /klaɪˈoʊ.iən/[2]
Orbital characteristics[3]
Epoch 31 December 2006 (JD 2454100.5)
Aphelion436.886 Gm (2.920 AU)
Perihelion269.828 Gm (1.804 AU)
353.357 Gm (2.362 AU)
Eccentricity0.236
1325.961 d (3.63 a)
326.072°
Inclination9.334°
327.651°
14.690°
Physical characteristics
Dimensions79.16 ± 1.6 km[3]
Mass(3.93 ± 1.48/1.28)×1017 kg[4]
Mean density
1.521 ± 0.572/0.497 g/cm3[4][a]
23.562 ± 0.001 h[3][5]
0.053[3][6]
G[3]
9.36[3]

84 Klio is a fairly large and very dark main-belt asteroid. It was discovered by R. Luther on 25 August 1865, and named after Clio, the Muse of history in Greek mythology. The name Clio had previously been suggested by the discoverer of 12 Victoria, and that is the name B. A. Gould, editor of the prestigious Astronomical Journal, adopted for that asteroid, because of the controversy over the name Victoria. An occultation by Klio over a dim star was observed on 2 April 1997.

Photometric observations of this asteroid during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico were used to create a light curve plot. This showed a synodic rotation period of 23.562 ± 0.001 hours and a brightness variation of 0.21 ± 0.02 magnitude during each cycle.[5]

Perturbation

Perturbations of asteroid 52 Europa by 84 Klio suggest that 52 Europa would have a mass as high as 1.68×1020 kg.[7][b] But this would require Europa to have an unrealistic density of 10.6 g/cm3.[7] Further observations of Klio will be needed to properly refine the mass of both asteroid Europa and Klio.

Notes

  1. ^ Assuming a diameter of 79 ± 4.867 km.
  2. ^ High estimate for mass of asteroid Europa 0.851 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.689E+20

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ 'Clioian' in Rita Dandridge, ed. (2019) The Collected Essays of Josephine J. Turpin Washington, p. 176
  3. ^ a b c d e f "JPL Small-Body Database Browser: 84 Klio" (2008-03-30 last obs). Retrieved 6 November 2008.
  4. ^ a b Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
  5. ^ a b Pilcher, Frederick (June 2008). "Period Determination for 84 Klio, 98 Ianthe, 102 Miriam 112 Iphigenia, 131 Vala, and 650 Amalasuntha". The Minor Planet Bulletin. 35 (2): 71–72. arXiv:1203.4336. Bibcode:2008MPBu...35...71P. doi:10.1016/j.pss.2012.03.009. S2CID 119226456.
  6. ^ Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
  7. ^ a b Michalak, G. (August 2001). "Determination of asteroid masses". Astronomy & Astrophysics. 374 (2): 703–711. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731.
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