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]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

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 characteristics

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

### 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 ({{{1}}}).[12] Observations by French amateur astronomer Laurent Bernasconi gave a similar period of 11.6 hours ({{{1}}}).[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.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 183).[2]

## References

1. ↑ 1.0 1.1 1.2 "183 Istria". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=183. Retrieved 30 May 2018.
2. ↑ 2.0 2.1 2.2 2.3 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "JPL Small-Body Database Browser: 183 Istria". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000183. Retrieved 30 May 2018.
4. ↑ 4.0 4.1 "Asteroid 183 Istria". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=183+Istria. Retrieved 30 May 2018.
5. ↑ 5.0 5.1 "Asteroid (183) Istria". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=183&pc=1.1.6. Retrieved 30 May 2018.
6. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. (catalog)
8. ↑ 8.0 8.1 8.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M.
9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
10. ↑ 10.0 10.1 10.2 10.3 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
11. ↑ 11.0 11.1 Behrend, Raoul. "Asteroids and comets rotation curves – (183) Istria". Geneva Observatory. http://obswww.unige.ch/~behrend/page1cou.html#000183. Retrieved 30 May 2018.
12. ↑ 12.0 12.1 12.2 Harris, A. W.; Young, J. W. (April 1983). "Asteroid rotation. IV". Icarus 54 (1): 59–109. doi:10.1016/0019-1035(83)90072-6. ISSN 0019-1035. Bibcode: 1983Icar...54...59H.
13. ↑ 13.0 13.1 13.2 "LCDB Data for (183) Istria". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=183|Istria. 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. doi:10.1016/j.icarus.2016.11.003. Bibcode: 2017Icar..284...30B.
15. ↑ 15.0 15.1 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.

## External links

* 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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