285 Regina

285 Regina
	Orbital diagram
Discovery
Discovered by	Auguste Charlois
Discovery date	3 August 1889
Designations
MPC designation	(285) Regina
Pronunciation	/rɪˈdʒaɪnə/ rij-EYE-nə
Alternative designations	A889 PA, 1911 QJ; 1951 AC1
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	104.63 yr (38215 d)
Aphelion	3.72130 AU (556.699 Gm)
Perihelion	2.44540 AU (365.827 Gm)
Semi-major axis	3.08335 AU (461.263 Gm)
Eccentricity	0.20690
Orbital period (sidereal)	5.41 yr (1977.6 d)
Average orbital speed	16.97 km/s
Mean anomaly	137.349°
Mean motion	0° 10m 55.348s / day
Inclination	17.6192°
Longitude of ascending node	311.385°
Argument of perihelion	14.4439°
Physical characteristics
Dimensions	45.13±2.2 km
Synodic rotation period	9.542 h (0.3976 d)
Geometric albedo	0.0547±0.006
Temperature	unknown
Absolute magnitude (H)	10.7

Last updated October 02, 2025

285 Regina is a typical, although fairly large, Main belt asteroid.^[2] It was discovered by Auguste Charlois on 3 August 1889 in Nice, France. The asteroid is a suspected interloper in the Eucharis asteroid family.^[3]

Analysis of the asteroid light curve generated from photometric data collected during 2008 show a rotation period of 9.542±0.001 h with a brightness variation of 0.16±0.03 in magnitude.^[4]

References

↑ "Regina" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
1 2 "285 Regina". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 11 May 2016.
↑ Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus, 216 (1): 69–81, arXiv: 1108.3740 , Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.
↑ Pilcher, Frederick (April 2010), "Rotation Period Determination for 285 Regina", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, vol. 37, no. 2, p. 50, Bibcode:2010MPBu...37...50P.

External links

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

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[1] "Regina" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)

[jpldata-2] 1 2 "285 Regina". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 11 May 2016.

[Novaković_et_al_2011-3] Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus, 216 (1): 69–81, arXiv: 1108.3740 , Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.

[Pilcher2010-4] Pilcher, Frederick (April 2010), "Rotation Period Determination for 285 Regina", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, vol. 37, no. 2, p. 50, Bibcode:2010MPBu...37...50P.

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