1207 Ostenia

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1207 Ostenia
1207Ostenia (Lightcurve Inversion).png
Lightcurve-based 3D-model of Ostenia
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 15 November 1931
MPC designation (1207) Ostenia
Named after
Hans Osten
(amateur astronomer)[2]
1931 VT · 1959 EF1
main-belt · Eos[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 84.41 yr (30,829 days)
Aphelion 3.2804 AU
Perihelion 2.7656 AU
3.0230 AU
Eccentricity 0.0851
5.26 yr (1,920 days)
0° 11m 15s / day
Inclination 10.363°
Physical characteristics
Dimensions 21.925±0.632 km[4]
22.93±1.3 km[5]
23.05 km (derived)[3]
7.7 (dated)h[6]
8.4 h (dated)[7]
9.07129 h[8]
9.07129±0.00005 h[9]
9.073±0.004 h[10]
0.1591 (derived)[3]
S (assumed)[3]
10.8[1][3][4] · 11.00[5]

1207 Ostenia, provisional designation 1931 VT, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 15 November 1931, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany, and named for amateur astronomer Hans Osten.[2][11]

Classification and orbit[edit]

The S-type asteroid is a member of the Eos family, thought to have formed from a catastrophic collision of its parent body resulting in more than 4,000 known members of the family. It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,920 days). Its orbit has an eccentricity of 0.09 and an inclination of 10° with respect to the ecliptic.[1] Ostenia's observation arc begins at Heidelberg with its official discovery observation. No precoveries were taken and no prior identifications were made.[11]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ostenia measures 21.925 and 22.93 kilometers in diameter, and its surface has an albedo of 0.176 and 0.1338, respectively.[4][5] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1591 and a diameter of 23.05 kilometers with an absolute magnitude of 10.8.[3]


In February 2006, photometric observations of Ostenia by Brian Warner at his Palmer Divide Observatory in Colorado Springs, Colorado (see § External links), were used to generate a well-defined lightcurve with a period of 9.073±0.004 hours and a variation in brightness of 0.60±0.02 magnitude (U=3).[10] Results from modeled lightcurves in 2009 and 2011, confirmed a rotation period of 9.07 hours (U=n.a.),[8][9] while previous observations from the 1970s, taken by Swedish astronomer Claes-Ingvar Lagerkvist at Mount Stromlo (Uppsala Southern Station in Australia) and Kvistaberg observatories gave a shorter period of 7.7 and 8.4 hours, respectively (U=2/2).[6][7]


This minor planet was named after Hans Osten (1875–1936) a German amateur astronomer, orbit computer and business man.[2] As a non-professional, Osten attracted attention with his precises calculations of comets and asteroids. He is known for calculating the orbit of 447 Valentine, taking into account perturbations by all major planets with such precision, that it was considered exemplary in the astronomical community. Osten received the silver Leibniz Medal in 1911.[12] Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 112).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1207 Ostenia (1931 VT)" (2016-04-11 last obs.). Jet Propulsion Laboratory. Retrieved 7 February 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1207) Ostenia. Springer Berlin Heidelberg. p. 101. ISBN 978-3-540-00238-3. Retrieved 7 February 2017.
  3. ^ a b c d e f "LCDB Data for (1207) Ostenia". Asteroid Lightcurve Database (LCDB). Retrieved 7 February 2017.
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 7 February 2017.
  5. ^ 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. Bibcode:2004PDSS...12.....T. Retrieved 7 February 2017.
  6. ^ a b Lagerkvist, C.-I. (March 1978). "Photographic photometry of 110 main-belt asteroids". Astronomy and Astrophysics Supplement Series: 361–381. Bibcode:1978A&AS...31..361L. Retrieved 7 February 2017.
  7. ^ a b Lagerkvist, C. I. (April 1979). "A lightcurve survey of asteroids with Schmidt telescopes - Observations of nine asteroids during oppositions in 1977". Icarus: 106–114. Bibcode:1979Icar...38..106L. doi:10.1016/0019-1035(79)90090-3. Retrieved 7 February 2017.
  8. ^ a b Durech, J.; Kaasalainen, M.; Warner, B. D.; Fauerbach, M.; Marks, S. A.; Fauvaud, S.; et al. (January 2009). "Asteroid models from combined sparse and dense photometric data". Astronomy and Astrophysics. 493 (1): 291–297. Bibcode:2009A&A...493..291D. doi:10.1051/0004-6361:200810393. Retrieved 7 February 2017.
  9. ^ a b Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 7 February 2017.
  10. ^ a b Warner, Brian D. (September 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006". The Minor Planet Bulletin. 33 (3): 58–62. Bibcode:2006MPBu...33...58W. ISSN 1052-8091. Retrieved 7 February 2017.
  11. ^ a b "1207 Ostenia (1931 VT)". Minor Planet Center. Retrieved 7 February 2017.
  12. ^ "Osten, Hans. Astronom, * 31.3.1875 Bremen, † 29.3.1936 Montevideo (Uruguay)". Deutsche Biographie.de (in German). Retrieved 22 November 2015.

External links[edit]