784 Pickeringia

784 Pickeringia
	Shape of Pickeringia from modeled lightcurve
Discovery
Discovered by	J. H. Metcalf
Discovery site	Winchester Obs. (799)
Discovery date	20 March 1914
Designations
MPC designation	(784) Pickeringia
Named after	Edward Charles Pickering; William Henry Pickering; (American astronomers);
Alternative designations	A914 FC · 1914 UM
Minor planet category	main-belt · (outer); background ;
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	105.82 yr (38,652 d)
Aphelion	3.8458 AU
Perihelion	2.3455 AU
Semi-major axis	3.0956 AU
Eccentricity	0.2423
Orbital period (sidereal)	5.45 yr (1,989 d)
Mean anomaly	97.354°
Mean motion	0° 10m 51.6s / day
Inclination	12.284°
Longitude of ascending node	14.917°
Argument of perihelion	238.01°
Physical characteristics
Mean diameter	74.89±0.92 km; 75.596±0.311 km; 89.42±3.4 km;
Mass	(3.74±0.32)×1018 kg
Mean density	12.70±3.49 g/cm3
Synodic rotation period	13.144±0.005 h
Pole ecliptic latitude	(103°, 68.0°) (λ1/β1); (282°, 35.0°) (λ2/β2);
Geometric albedo	0.0555±0.005; 0.080±0.002; 0.086±0.014;
Spectral type	SMASS = C ; V–R = 0.416±0.023;
Absolute magnitude (H)	9.00; 9.3;

784 Pickeringia (prov. designation: A914 FC or 1914 UM) is a large background asteroid, approximately 76 kilometers (47 miles) in diameter, located in the outer region of the asteroid belt. It was discovered on 20 March 1914, by American astronomer Joel Hastings Metcalf at the Winchester Observatory (799) in Massachusetts. The dark C-type asteroid has a rotation period of 13.1 hours and an irregular shape. It was named after American astronomers Edward Charles Pickering (1846–1919) and his brother William Henry Pickering (1858–1938).

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