1511 Daléra
| Discovery | |
|---|---|
| Discovered by | L. Boyer |
| Discovery site | Algiers Obs. |
| Discovery date | 22 March 1939 |
| Designations | |
| MPC designation | (1511) Dalera |
|
Named after
|
Paul Daléra (friend of discoverer) |
| 1939 FB · 1928 DB 1954 LM |
|
| main-belt · (inner) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.47 yr (32,312 days) |
| Aphelion | 2.6137 AU |
| Perihelion | 2.1020 AU |
| 2.3579 AU | |
| Eccentricity | 0.1085 |
| 3.62 yr (1,322 days) | |
| 181.19° | |
| 0° 16m 19.92s / day | |
| Inclination | 4.0686° |
| 81.734° | |
| 97.396° | |
| Physical characteristics | |
| Dimensions | 7.15 km (calculated) 11.36±3.14 km 13.515±0.231 km 18.23±1.28 km |
|
3.880±0.001 h 3.881±0.001 h 4.2227±0.0011 h |
|
|
0.03±0.01 0.080±0.011 0.10±0.05 0.20 (assumed) |
|
| S | |
| 12.644±0.002 (R) · 12.70 · 12.8 · 12.99 · 13.09 | |
1511 Daléra, provisional designation 1939 FB, is an asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 22 March 1939, by French astronomer Louis Boyer at the Algerian Algiers Observatory in North Africa.
Daléra orbits the Sun at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,322 days). Its orbit has an eccentricity of 0.11 and an inclination of 4° with respect to the ecliptic. It was first identified as 1928 DB at Heidelberg Observatory in 1928, extending the body's observation arc by 11 years prior to its official discovery observation.
In March 2015, three rotational light-curves of Daléra were independently obtained by Italian astronomers Maurizio Scardella (D06), Fabio Salvaggio (K54, A81), and Giovanni Casalnuovo (C62) after being reported as a light-curve photometry opportunity at minorplanet.info (CALL). They gave a rotation period of 3.880 and 3.881 hours with a brightness variation of 0.18 and 0.14 magnitude, respectively (U=2/3-/2-). Previously, photometric observations at the Palomar Transient Factory in September 2013, gave a longer period of 4.2227 hours and an amplitude of 0.14 magnitude (U=2).
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