183 Istria

183 Istria

Lightcurve-based 3D-model of Istria
Discovery[1]
Discovered by	J. Palisa
Discovery site	Austrian Naval Obs.
Discovery date	8 February 1878
Designations
MPC designation	(183) Istria
Pronunciation	/ˈɪstriə/[6]
Named after	Istrian Peninsula[2] (in the Adriatic Sea)
Alternative designations	A878 CD; 1948 CG
Minor planet category	main-belt[1][3] · (middle) background[4][5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	112.08 yr (40,937 d)
|{{{apsis}}}|helion}}	3.7699 AU
|{{{apsis}}}|helion}}	1.8117 AU
Semi-major axis	2.7908 AU
Eccentricity	0.3508
Orbital period	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°
|{{{apsis}}}|helion}}	264.12°
Physical characteristics
Mean diameter	30.779±0.278 km[7] 32.927±0.168 km[8] 34.55±0.84 km[9] 35.43±2.8 km[10]
Rotation period	11.6±0.5 h[11] 11.77 h[12]
Geometric albedo	0.1890±0.034[10] 0.201±0.012[9] 0.227±0.038[8] 0.2582±0.0384[7]
Spectral type	Tholen = S[3] SMASS = S[3][13] S[14][15] B–V = 0.842[3] U–B = 0.359[3]
Absolute magnitude (H)	9.56±0.45[15] 9.66[12] 9.68[3][13][7][9][10]

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.^[1] The S-type asteroid has a rotation period of 11.77 hours.^[13] It was named for the Istrian Peninsula.^[2]

Istria is a non-family asteroid from the main belt's background population.^[4][5] 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.^[3]

Istria has been characterized as a common, stony S-type asteroid in both the Tholen and SMASS classification.^[3]

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 ({{{1}}}).^[12] Observations by French amateur astronomer Laurent Bernasconi gave a similar period of 11.6 hours ({{{1}}}).^[11]

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]}

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.^[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 183).^[2]

• Asteroid Lightcurve Database (LCDB), query form (info )
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 183 Istria at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 183 Istria at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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