216 Kleopatra

216 Kleopatra
Discovery [1]
Discovered byJ. Palisa
Discovery sitePola Obs.
Discovery date10 April 1880
Designations
(216) Kleopatra
Pronunciation/ˌkliəˈpætrə/[2]
Named after
Cleopatra (Egyptian queen)[3]
A880 GB · 1905 OA
1910 RA
main-belt [1][4] · (central) [5]
background [6]
AdjectivesKleopatrian, Kleopatrean
Orbital characteristics [4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc137.60 yr (50,259 d)
Aphelion3.4951 AU
Perihelion2.0931 AU
2.7941 AU
Eccentricity0.2509
4.67 yr (1,706 d)
346.24°
0° 12m 39.6s / day
Inclination13.113°
215.36°
180.11°
Known satellites2 (Alexhelios · Cleoselene)
Physical characteristics
Dimensionsc/a = 0.18±0.02[7]
(276 × 94 × 78) ± 15% km[8]
118±2 km[7]
122±30 km[8]
103±4 km[9]
121.6±1.6 km[10]
135±2 km[11]
Mass(3.0±0.3)×1018 kg[7]
(2.97±0.02)×1018 kg[12][8]
Mean density
3.45±0.41 g/cm3[7]
ca. 4.5 g/cm3 (most likely between 3.6±0.4 g/cm3 for D = 135 km and 5.4±0.4 g/cm3 for D = 109 km)[8]
5.385280±0.000001 h[8]
0.152 (calculated)[7]
0.1164±0.004[11]
0.170[13]
0.149±0.005[10]
0.1111±0.0336[14]
0.1068[15]
0.200±0.028[9]
M (Tholen)[4] · Xe (SMASS)[4]
M [14][16]
B–V = 0.713[4]
U–B = 0.238[4]
7.30[4][9][11][10][14]
7.35±0.02[5][15][17] · 7.45[13]

216 Kleopatra is a large M-type asteroid with a mean diameter of 120 kilometers (75 miles) and is noted for its elongate bone or dumbbell shape.[18][19][8][20] It was discovered on 10 April 1880 by Austrian astronomer Johann Palisa at the Austrian Naval Pola Observatory, in what is now Pula, Croatia, and was named after Cleopatra, the famous Egyptian queen.[1] It has two small minor-planet moons which were discovered in 2008 and later named Alexhelios and Cleoselene.

  1. ^ a b c Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ "Cleopatra". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 26 January 2020.
  3. ^ Cite error: The named reference springer was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference jpldata was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference lcdb was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Ferret was invoked but never defined (see the help page).
  7. ^ a b c d e P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  8. ^ a b c d e f Shepard et al (2018) A revised shape model of asteroid (216) Kleopatra, Icarus 311, 197-209
  9. ^ a b c Cite error: The named reference Masiero-2012 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference AKARI was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference SIMPS was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Descamps-2011 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Shevchenko-2006 was invoked but never defined (see the help page).
  14. ^ a b c Cite error: The named reference WISE was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Pravec-2012b was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Belskaya-2017 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Harris-1989b was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Ostro-2000 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Descamps2015 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Marchis was invoked but never defined (see the help page).