4362 Carlisle information

4362 Carlisle
Discovery
Discovered by	Perth Obs.
Discovery site	Perth Obs.
Discovery date	1 August 1978
Designations
MPC designation	(4362) Carlisle
Named after	Albert Carlisle; (Australian meteorite hunter)
Alternative designations	1978 PR4 · 1974 FM1; 1984 EE1
Minor planet category	main-belt · Flora
Orbital characteristics
	Epoch 1 July 2021 (JD 2459396.5)
	Uncertainty parameter 0
Observation arc	68.88 yr (25,158 d)
Aphelion	2.4645 AU
Perihelion	2.0119 AU
Semi-major axis	2.2382 AU
Eccentricity	0.1011
Orbital period (sidereal)	3.35 yr (1,223 d)
Mean anomaly	21.611°
Mean motion	0° 17m 39.84s / day
Inclination	4.7137°
Longitude of ascending node	34.379°
Argument of perihelion	171.93°
Known satellites	1 (>0.33 Ds/Dp P: 1.804 h)
Physical characteristics
Mean diameter	<5.31 km (primary); >1.75 km (secondary); 5.20±0.23 km (combined); 5.590±0.174 km (combined);
Synodic rotation period	2.63289±0.00007 h
Geometric albedo	0.391±0.055; 0.412±0.064;
Spectral type	S (assumed)
Absolute magnitude (H)	13.16

4362 Carlisle, provisional designation: 1978 PR₄, is a stony Flora asteroid and binary system from the inner regions of the asteroid belt. It was discovered on 1 August 1978, by staff members of the Perth Observatory at Bickley, Western Australia.^[1] The asteroid measures approximately 5 kilometers (3.1 miles) in diameter, has a short rotation period of 2.6 hours, and is likely spheroidal in shape. It was named in memory of Australian meteorite hunter Albert Carlisle (1917–1993).^[2] In June 2021, the discovery of a companion with an orbital period of 1.8 days and a diameter no less than a third of its primary, was announced.^[6]

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