397 Vienna

Short description: Main-belt asteroid

397 Vienna

Orbital diagram

Discovery
Discovered by| Auguste Charlois
Discovery date| 19 December 1894
Designations

MPC designation

| (397) Vienna
Pronunciation| /viˈɛnə/[1]
Named after| Vienna

Alternative designations

| 1894 BM
Minor planet category| Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 117.45 yr (42,900 d)
|{{{apsis}}}|helion}}| 3.28657 astronomical unit|AU (491.664 Gm)
|{{{apsis}}}|helion}}| 1.98686 AU (297.230 Gm)

Semi-major axis

| 2.63671 AU (394.446 Gm)
Eccentricity| 0.24646
Orbital period| 4.28 yr (1,563.8 d)
Mean anomaly| 202.358°
Mean motion| 0° 13m 48.731s / day
Inclination| 12.8534°
Longitude of ascending node| 227.935°

|{{{apsis}}}|helion}}

| 139.975°
Physical characteristics
Dimensions| 49.032±1.055 km
Rotation period| 15.48 h (0.645 d)
Geometric albedo| 0.1776±0.015
Absolute magnitude (H)| 9.31

Vienna (minor planet designation: 397 Vienna) is a typical Main belt asteroid. It was discovered by French astronomer Auguste Charlois on 19 December 1894 in Nice, and was most likely named after the city of Vienna, Austria.[3] This object is orbiting the Sun at a distance of 2.64 astronomical unit|AU with an orbital eccentricity (ovalness) of 0.246 and a period of 4.28 yr. The orbital plane is inclined at an angle of 12.85° to the ecliptic.[2]

Photometric observations from multiple sites during 2017 were combined to produce an irregular light curve showing a rotation period of 15.461±0.001 h with a luminosity amplitude of 0.16±0.02 in magnitude. This result is consistent with previous measurements.[4] The Tholen spectral type of this object is S and the SMASSII spectral type is K. Although the 'S' class suggests a stony composition, the latter class is consistent with carbonaceous chondrite meteorites.[5] Infrared observations from NEOWISE indicate a diameter of 49 km.[2]

## References

1. ↑ "Vienna". Vienna. Oxford University Press. http://www.lexico.com/definition/Vienna.
2. ↑ 2.0 2.1 2.2 Yeomans, Donald K. (2007-05-02). "397 Vienna (1894 BM)". JPL Small-Body Database Browser. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=397.
3. ↑ Schmadel, Lutz (2003). Dictionary of minor planet names. 1. Springer. p. 48. ISBN 9783540002383. https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA48.
4. ↑ Pilcher, Frederick et al. (October 2017). "Rotation Period Determination for 397 Vienna". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 44 (4): 316. Bibcode: 2017MPBu...44..316P.
5. ↑ Clark, Beth Ellen et al. (July 2009). "Spectroscopy of K-complex asteroids: Parent bodies of carbonaceous meteorites?". Icarus 202 (1): 119–133. doi:10.1016/j.icarus.2009.02.027. Bibcode: 2009Icar..202..119C.

## External links

* 397 Vienna at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 397 Vienna at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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