4151 Alanhale

4151 Alanhale
Discovery
Discovered by	C. S. Shoemaker; E. M. Shoemaker
Discovery site	Palomar Obs.
Discovery date	24 April 1985
Designations
MPC designation	(4151) Alanhale
Named after	Alan Hale (astronomer)
Alternative designations	1985 HV1 · 1968 HD; 1976 SO1 · 1979 FX1; 1982 SZ4 · 1985 JX
Minor planet category	main-belt · Themis
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	48.95 yr (17,878 days)
Aphelion	3.5904 AU
Perihelion	2.7017 AU
Semi-major axis	3.1461 AU
Eccentricity	0.1412
Orbital period (sidereal)	5.58 yr (2,038 days)
Mean anomaly	346.46°
Mean motion	0° 10m 35.76s / day
Inclination	1.0079°
Longitude of ascending node	67.051°
Argument of perihelion	75.088°
Physical characteristics
Dimensions	15.37 km (calculated); 19.526±0.269 km; 22.66±0.59 km
Synodic rotation period	11.9177±0.0047 h
Geometric albedo	0.045±0.006; 0.0734±0.0099; 0.08 (assumed)
Spectral type	C
Absolute magnitude (H)	11.976±0.003 (R) · 12.0 · 12.20 · 12.3 · 12.43 · 12.78±0.21

4151 Alanhale, provisional designation 1985 HV₁, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered by the American astronomer couple Carolyn and Eugene Shoemaker at the U.S. Palomar Observatory, California, on 24 April 1985.^[9] It was named for American astronomer Alan Hale.^[2]

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Discovery ^[1]
Discovered by	C. S. Shoemaker E. M. Shoemaker
Discovery site	Palomar Obs.
Discovery date	24 April 1985
Designations
MPC designation	(4151) Alanhale
Named after	Alan Hale (astronomer)^[2]
Alternative designations	1985 HV₁ · 1968 HD 1976 SO₁ · 1979 FX₁ 1982 SZ₄ · 1985 JX
Minor planet category	main-belt · Themis ^[3]
Orbital characteristics ^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	48.95 yr (17,878 days)
Aphelion	3.5904 AU
Perihelion	2.7017 AU
Semi-major axis	3.1461 AU
Eccentricity	0.1412
Orbital period (sidereal)	5.58 yr (2,038 days)
Mean anomaly	346.46°
Mean motion	0° 10^m 35.76^s / day
Inclination	1.0079°
Longitude of ascending node	67.051°
Argument of perihelion	75.088°
Physical characteristics
Dimensions	15.37 km (calculated)^[3] 19.526±0.269 km^[4]^[5] 22.66±0.59 km^[6]
Synodic rotation period	11.9177±0.0047 h^[7]
Geometric albedo	0.045±0.006^[5]^[6] 0.0734±0.0099^[4] 0.08 (assumed)^[3]
Spectral type	C ^[3]^[8]
Absolute magnitude (H)	11.976±0.003 (R)^[7] · 12.0^[4] · 12.20^[6] · 12.3^[1] · 12.43^[3] · 12.78±0.21^[8]