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1244 Deira
_Deira.png) Modelled shape of Deira from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 25 May 1932 |
| Designations | |
| (1244) Deira | |
| Pronunciation | /ˈdaɪrə/ DY-rə or /ˈdɛərə/ DAIR-ə[2] |
Named after | Deira, near the town of Ossett, England[3] (alt. Celtic Kingdom of Deira) |
| 1932 KE · 1930 YR 1984 YQ6 · A908 TD A921 GC · A924 BH | |
| Orbital characteristics[1] | |
| 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 |
| 2.3430 AU | |
| Eccentricity | 0.0982 |
| 3.59 yr (1,310 days) | |
| 335.23° | |
| 0° 16m 29.28s / day | |
| Inclination | 8.6950° |
| 277.12° | |
| 261.45° | |
| Physical characteristics | |
| 28.816±0.546 km[7] 30.432±9.136 km[8] 30.95±1.9 km[9] 31.799±0.487 km[10] 32.28±0.35 km[11] 33.15±7.01 km[12] 35.19±0.19 km[13] | |
| 5 (poor) h[14] 210.6±0.1 h[a] 216.98±0.05 h[15] 217.1±0.1 h[b] | |
Pole ecliptic latitude | |
| 0.03±0.00[13] 0.0357±0.0051[10] 0.037±0.011[12] 0.0416±0.0312[8] 0.052±0.001[11] 0.0557±0.007[9] | |
| 11.30[9][10][11] 11.50[1][17][8] | |
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,[4] who named it after Deira, an old kingdom near his birthplace, the market town of Ossett, located in West Yorkshire, England.[3]
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