1244 Deira

1244 Deira
	Modelled shape of Deira from its lightcurve
Discovery
Discovered by	C. Jackson
Discovery site	Johannesburg Obs.
Discovery date	25 May 1932
Designations
MPC designation	(1244) Deira
Pronunciation	/ˈdaɪərə/ or /ˈdɛərə/
Named after	Deira, near the town of Ossett, England; (alt. Celtic Kingdom of Deira)
Alternative designations	1932 KE · 1930 YR; 1984 YQ6 · A908 TD; A921 GC · A924 BH
Minor planet category	main-belt · (inner); background;
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	109.13 yr (39,861 days)
Aphelion	2.5731 AU
Perihelion	2.1129 AU
Semi-major axis	2.3430 AU
Eccentricity	0.0982
Orbital period (sidereal)	3.59 yr (1,310 days)
Mean anomaly	335.23°
Mean motion	0° 16m 29.28s / day
Inclination	8.6950°
Longitude of ascending node	277.12°
Argument of perihelion	261.45°
Physical characteristics
Mean diameter	28.816±0.546 km; 30.432±9.136 km; 30.95±1.9 km; 31.799±0.487 km; 32.28±0.35 km; 33.15±7.01 km; 35.19±0.19 km
Synodic rotation period	5 (poor) h; 210.6±0.1 h; 216.98±0.05 h; 217.1±0.1 h
Pole ecliptic latitude	(314.0°, −46.0°) (λ1/β1); (107.0°, −56.0°) (λ2/β2);
Geometric albedo	0.03±0.00; 0.0357±0.0051; 0.037±0.011; 0.0416±0.0312; 0.052±0.001; 0.0557±0.007
Spectral type	X (S3OS2); P (WISE);
Absolute magnitude (H)	11.30; 11.50

1244 Deira (prov. designation: 1932 KE) is a dark background asteroid and slow rotator from the inner region of the asteroid belt. The X-type asteroid has an exceptionally long rotation period of 210.6 hours and measures approximately 31 kilometers (19 miles) in diameter. It was discovered on 25 May 1932, by English-born South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, who named it after Deira, an old kingdom near his birthplace, the market town of Ossett, located in West Yorkshire, England.

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