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]

183 Istria
183Istria (Lightcurve Inversion).png
Lightcurve-based 3D-model of Istria
Discovered byJ. Palisa
Discovery siteAustrian Naval Obs.
Discovery date8 February 1878
(183) Istria
Named after
Istrian Peninsula[2]
(in the Adriatic Sea)
A878 CD; 1948 CG
main-belt[1][3] · (middle)
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc112.08 yr (40,937 d)
Aphelion3.7699 AU
Perihelion1.8117 AU
2.7908 AU
4.66 yr (1,703 d)
0° 12m 41.04s / day
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]
11.6±0.5 h[11]
11.77 h[12]
Tholen = S[3]
SMASS = S[3][13]
B–V = 0.842[3]
U–B = 0.359[3]

Orbit and classificationEdit

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]

Physical characteristicsEdit

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

Rotation periodEdit

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 albedoEdit

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]


  1. ^ a b c "183 Istria". Minor Planet Center. Retrieved 30 May 2018.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(183) Istria". Dictionary of Minor Planet Names – (183) Istria. Springer Berlin Heidelberg. p. 31. doi:10.1007/978-3-540-29925-7_184. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g h i "JPL Small-Body Database Browser: 183 Istria" (2018-03-23 last obs.). Jet Propulsion Laboratory. Retrieved 30 May 2018.
  4. ^ a b "Asteroid 183 Istria". Small Bodies Data Ferret. Retrieved 30 May 2018.
  5. ^ a b "Asteroid (183) Istria". AstDyS-2, Asteroids – Dynamic Site. Retrieved 30 May 2018.
  6. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  7. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010. (catalog)
  8. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID 119293330.
  9. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  10. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  11. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (183) Istria". Geneva Observatory. Retrieved 30 May 2018.
  12. ^ a b c Harris, A. W.; Young, J. W. (April 1983). "Asteroid rotation. IV". Icarus. 54 (1): 59–109. Bibcode:1983Icar...54...59H. doi:10.1016/0019-1035(83)90072-6. ISSN 0019-1035.
  13. ^ a b c "LCDB Data for (183) Istria". Asteroid Lightcurve Database (LCDB). Retrieved 30 May 2018.
  14. ^ Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K.; et al. (March 2017). "Refining the asteroid taxonomy by polarimetric observations". Icarus. 284: 30–42. Bibcode:2017Icar..284...30B. doi:10.1016/j.icarus.2016.11.003.
  15. ^ a b Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.

External linksEdit