654 Zelinda
Asteroid
From Wikipedia, the free encyclopedia
654 Zelinda is a minor planet orbiting the Sun that was discovered on 4 January 1908 by German astronomer August Kopff. It is orbiting the Sun at a distance of 2.297 AU with an orbital eccentricity of 0.23 and a period of 3.48 yr.[1] The orbital plane is inclined at an angle of 18.1° to the plane of the ecliptic. On favorable oppositions, it can be as bright as magnitude 10.0, as observed on January 30, 2016.
| Discovery | |
|---|---|
| Discovered by | August Kopff |
| Discovery site | Heidelberg |
| Discovery date | 4 January 1908 |
| Designations | |
| 1908 BM | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 108.29 yr (39553 d) |
| Aphelion | 2.8288 AU (423.18 Gm) |
| Perihelion | 1.7653 AU (264.09 Gm) |
| 2.2970 AU (343.63 Gm) | |
| Eccentricity | 0.23150 |
| 1,271.6 d (3.48 yr) | |
| 51.9052° | |
| 0° 16m 59.196s / day | |
| Inclination | 18.125° |
| 278.460° | |
| 214.008° | |
| Physical characteristics | |
| 80.9 km[1] 63.915±2.615 km[2] | |
| Mass | (1.35±0.14)×1018 kg[2] |
Mean density | 1.23±0.19 g/cm3[2] |
| 31.735 h (1.3223 d) | |
| 0.0425±0.003 | |
| 8.52 | |
In 1988, this object was detected with radar from the Arecibo Observatory at a distance of 0.89 AU. The measured radar cross-section was 2,200 km2.[3] Measurements made using the adaptive optics system at the W. M. Keck Observatory give a diameter estimate of 131 km. This is 13% smaller than the diameter estimated from the IRAS observatory measurements. It is roughly triangular in shape,[4] and spins with a synodic rotation period of 31.735 h.
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