165 Loreley
165 Loreley is a main-belt asteroid that was discovered by C. H. F. Peters on August 9, 1876, in Clinton, New York and named after the Lorelei, a figure in German folklore.
A three-dimensional model of 165 Loreley based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 9 August 1876 |
| Designations | |
MPC designation | (165) Loreley |
| Pronunciation | /ˈlɔːrəlaɪ/ |
Alternative designations | A876 PA; 1948 QS; 1959 PB; 1960 WG |
Minor planet category | main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 139.51 yr (50957 d) |
| Aphelion | 3.3904 AU (507.20 Gm) |
| Perihelion | 2.8599 AU (427.83 Gm) |
Semi-major axis | 3.1251 AU (467.51 Gm) |
| Eccentricity | 0.084887 |
Orbital period (sidereal) | 5.52 yr (2017.9 d) |
Mean anomaly | 125.88° |
Mean motion | 0° 10m 42.24s / day |
| Inclination | 11.224° |
Longitude of ascending node | 302.53° |
| 347.29° | |
| Earth MOID | 1.84454 AU (275.939 Gm) |
| Jupiter MOID | 1.81383 AU (271.345 Gm) |
| TJupiter | 3.180 |
| Physical characteristics | |
| Dimensions | 180.083±2.064 km 164.92 ± 8.14 km |
| Mass | (1.91 ± 0.19) × 1019 kg |
Mean density | 8.14 ± 1.46 g/cm3 |
Synodic rotation period | 7.226 h (0.3011 d) 7.22667 h |
| 0.0642±0.004 | |
| 7.65, 7.76 | |
In the late 1990s, a network of astronomers worldwide gathered light curve data that was ultimately used to derive the spin states and shape models of 10 new asteroids, including (165) Loreley. The light curve of this asteroid varies by no more than 0.2 in magnitude, while the derived shape model shows multiple flat spots on the surface.
Between 2003 and 2021, 165 Loreley has been observed to occult thirteen stars.
The asteroid has an oblate shape with a size ratio of 1.26 ± 0.08 between the major and minor axes, as determined from the W. M. Keck Observatory.
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