| Minorplanet: | yes |
| Background: |
|
| 165 Loreley | |
| Discovered: | 9 August 1876 |
| Mpc Name: | (165) Loreley |
| Alt Names: | A876 PA; 1948 QS; 1959 PB; 1960 WG |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 3.1251AU |
| Perihelion: | 2.8599AU |
| Aphelion: | 3.3904abbr=onNaNabbr=on |
| Eccentricity: | 0.084887 |
| Inclination: | 11.224° |
| Asc Node: | 302.53° |
| Arg Peri: | 347.29° |
| Dimensions: | 164.92 ± 8.14 km |
| Density: | 8.14 ± 1.46 g/cm3 |
| Rotation: | 7.226abbr=onNaNabbr=on 7.22667 h |
| Abs Magnitude: | 7.65, 7.76 |
| Mean Motion: | / day |
| Observation Arc: | 139.51 yr (50957 d) |
| Uncertainty: | 0 |
| Moid: | 1.84454AU |
| Jupiter Moid: | 1.81383AU |
| Tisserand: | 3.180 |
165 Loreley is a large 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. It is orbiting the Sun at a distance of and a low eccentricity of 0.08. The orbital plane is inclined at an angle of 11.2° to the plane of the ecliptic.
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. 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.
Between 2003 and 2021, 165 Loreley has been observed to occult thirteen stars.