820 Adriana
820 Adriana, provisional designation 1916 ZB, is an exceptionally dark asteroid from the outer region of the asteroid belt, about 59 kilometers in diameter. It was discovered by German astronomer Max Wolf at Heidelberg Observatory in southern Germany, on 30 March 1916.
| Discovery | |
|---|---|
| Discovered by | M. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 30 March 1916 |
| Designations | |
MPC designation | (820) Adriana |
Named after | unknown |
Alternative designations | 1916 ZB · 1934 NA1 1934 PV · 1935 SE 1975 YP |
Minor planet category | main-belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.57 yr (29427 d) |
| Aphelion | 3.2848 AU (491.40 Gm) |
| Perihelion | 2.9746 AU (444.99 Gm) |
Semi-major axis | 3.1297 AU (468.20 Gm) |
| Eccentricity | 0.049550 |
Orbital period (sidereal) | 5.54 yr (2022.3 d) |
Mean anomaly | 284.54° |
Mean motion | 0° 10m 40.836s / day |
| Inclination | 5.9337° |
Longitude of ascending node | 118.47° |
| 193.08° | |
| Earth MOID | 1.95997 AU (293.207 Gm) |
| Jupiter MOID | 1.8749 AU (280.48 Gm) |
| TJupiter | 3.203 |
| Physical characteristics | |
Mean radius | 29.325±1.25 km (IRAS:26) |
| 0.0204±0.002 (IRAS:26) | |
| 10.4 | |
The asteroid orbits the Sun at a distance of 3.0–3.3 AU once every 5 years and 7 months (2,027 days). Its orbit shows an eccentricity of 0.05 and is tilted by 6 degrees to the plane of the ecliptic. According to the survey carried out by the Infrared Astronomical Satellite, IRAS, the asteroid's surface has an extremely low albedo of 0.02. The body's spectral type remains unknown, as does its rotation period. By 2014, there were only 22 asteroids with an unknown rotation period for the low-numbered asteroids up to number 1000 (also see 398 Admete).
Any reference of this name to a person or occurrence is unknown.