183 Istria
Istria (minor planet designation: 183 Istria) is a stony background asteroid from the central regions of the asteroid belt, approximately 33 kilometers (21 miles) in diameter. It was discovered on 8 February 1878, by Austrian astronomer Johann Palisa at the Austrian Naval Observatory in Pola, in what is now Croatia. The S-type asteroid has a rotation period of 11.77 hours. It was named for the Istrian Peninsula.
Lightcurve-based 3D-model of Istria | |
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Austrian Naval Obs. |
| Discovery date | 8 February 1878 |
| Designations | |
MPC designation | (183) Istria |
| Pronunciation | /ˈɪstriə/ |
Named after | Istrian Peninsula (in the Adriatic Sea) |
Alternative designations | A878 CD; 1948 CG |
Minor planet category | main-belt · (middle) background |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.08 yr (40,937 d) |
| Aphelion | 3.7699 AU |
| Perihelion | 1.8117 AU |
Semi-major axis | 2.7908 AU |
| Eccentricity | 0.3508 |
Orbital period (sidereal) | 4.66 yr (1,703 d) |
Mean anomaly | 61.603° |
Mean motion | 0° 12m 41.04s / day |
| Inclination | 26.391° |
Longitude of ascending node | 141.95° |
| 264.12° | |
| Physical characteristics | |
Mean diameter | 30.779±0.278 km 32.927±0.168 km 34.55±0.84 km 35.43±2.8 km |
Synodic rotation period | 11.6±0.5 h 11.77 h |
| 0.1890±0.034 0.201±0.012 0.227±0.038 0.2582±0.0384 | |
| Tholen = S SMASS = S S B–V = 0.842 U–B = 0.359 | |
| 9.56±0.45 9.66 9.68 | |
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