84 Klio

84 Klio
	A lightcurve-based 3D model of the asteroid
Discovery
Discovered by	Karl Theodor Robert Luther
Discovery date	25 August 1865
Designations
Pronunciation	/ˈklaɪ.oʊ/
Named after	Clio
Minor planet category	Main belt · Klio
Adjectives	Klionian /klaɪˈoʊniən/; Klioian /klaɪˈoʊ.iən/
Orbital characteristics
	Epoch 9 June 2026 (JD 2461200.5)
	Uncertainty parameter 0
Aphelion	2.9198 AU
Perihelion	1.8068 AU
Semi-major axis	2.3633 AU
Eccentricity	0.2355
Orbital period (sidereal)	1327.01 d (3.6332 yr)
Mean anomaly	93.074°
Inclination	9.3143°
Longitude of ascending node	327.486°
Argument of perihelion	15.191°
TJupiter	3.494
Physical characteristics
Dimensions	79.16 ± 1.6 km
Mass	(3.93 ± 1.48/1.28)×1017 kg; (6.6±2.5)×1017 kg
Mean density	1.521 ± 0.572/0.497 g/cm3; 2.53 g/cm3
Synodic rotation period	23.562 ± 0.001 h
Geometric albedo	0.053
Spectral type	G
Absolute magnitude (H)	9.36

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.

Perturbation

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

Notes

↑ Calculated from its standard gravitational parameter GM = 0.044±0.017 km³/s².
↑ Assuming a diameter of 79 ± 4.867 km.
↑ Assuming a diameter of 79.2 km.
↑ High estimate for mass of asteroid Europa 0.851 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.689E+20

References

↑ Noah Webster (1884) A Practical Dictionary of the English Language
↑ 'Clioian' in Rita Dandridge, ed. (2019) The Collected Essays of Josephine J. Turpin Washington, p. 176
1 2 3 4 5 6 "JPL Small-Body Database Browser: 84 Klio" (2008-03-30 last obs). Retrieved 6 November 2008.
1 2 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.
1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
1 2 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.
↑ Asteroid Data Sets Archived 17 December 2009 at the Wayback Machine
1 2 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.

External links

84 Klio at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
84 Klio at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by adding missing information.

[6] Calculated from its standard gravitational parameter GM = 0.044±0.017 km³/s².

[7] Assuming a diameter of 79 ± 4.867 km.

[8] Assuming a diameter of 79.2 km.

[math-12] High estimate for mass of asteroid Europa 0.851 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.689E+20

[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

[jpldata-3] 1 2 3 4 5 6 "JPL Small-Body Database Browser: 84 Klio" (2008-03-30 last obs). Retrieved 6 November 2008.

[FiengaEtAl2020-4] 1 2 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.

[Fuentes-Muñoz2025-5] 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.

[Pilcher2008-9] 1 2 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.

[10] Asteroid Data Sets Archived 17 December 2009 at the Wayback Machine

[Michalak2001-11] 1 2 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.