183 Istria
Main-belt asteroid
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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.[1] The S-type asteroid has a rotation period of 11.77 hours.[13] It was named for the Istrian Peninsula.[3]
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Lightcurve-based 3D-model of Istria | |
| Discovery[1] | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Austrian Naval Obs. |
| Discovery date | 8 February 1878 |
| Designations | |
| (183) Istria | |
| Pronunciation | /ˈɪstriə/[2] |
Named after | Istrian Peninsula[3] (in the Adriatic Sea) |
| A878 CD; 1948 CG | |
| main-belt[1][4] · (middle) background[5][6] | |
| Orbital characteristics[4] | |
| 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 |
| 2.7908 AU | |
| Eccentricity | 0.3508 |
| 4.66 yr (1,703 d) | |
| 61.603° | |
| 0° 12m 41.04s / day | |
| Inclination | 26.391° |
| 141.95° | |
| 264.12° | |
| Physical characteristics | |
| 30.779±0.278 km[7] 32.927±0.168 km[8] 34.55±0.84 km[9] 35.43±2.8 km[10] | |
| 11.6±0.5 h[11] 11.77 h[12] | |
| 0.1890±0.034[10] 0.201±0.012[9] 0.227±0.038[8] 0.2582±0.0384[7] | |
| Tholen = S[4] SMASS = S[4][13] S[14][15] B–V = 0.842[4] U–B = 0.359[4] | |
| 9.56±0.45[15] 9.66[12] 9.68[4][13][7][9][10] | |
Orbit and classification
Istria is a non-family asteroid from the main belt's background population.[5][6] It orbits the Sun in the central main-belt at a distance of 1.8–3.8 AU once every 4 years and 8 months (1,703 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.35 and an inclination of 26° with respect to the ecliptic.[4]
Physical characteristics
Istria has been characterized as a common, stony S-type asteroid in both the Tholen and SMASS classification.[4]
Rotation period
In August 1979, a rotational lightcurve of Istria was obtained from photometric observations by American astronomer Alain Harris. Lightcurve analysis gave a well-defined rotation period of 11.77 hours with a brightness amplitude of 0.31 magnitude (U=3).[12] Observations by French amateur astronomer Laurent Bernasconi gave a similar period of 11.6 hours (U=2).[11]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Istria measures between 30.779 and 35.43 kilometers in diameter and its surface has an albedo between 0.1890 and 0.2582.[7][8][9][10]
Naming
This minor planet was named after the Istrian Peninsula in the Adriatic Sea, where the city of Pula (then Pola) with its discovering observatory is located. A the time the peninsula was part of the Austro-Hungarian Empire. The asteroid's name was given by Vice-Admiral Bernhard von Wüllerstorf-Urbair, who is known as the captain of the first Austrian circumnavigatory adventure with the sail frigate SMS Novara.[3] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 183).[3]
