1293 Sonja

1293 Sonja
Discovery [1]
Discovered by E. Delporte
Discovery site Uccle – Belgium
Discovery date 26 September 1933
Designations
MPC designation 1293 Sonja
Named after
 (unknown)[2]
1933 SO
Mars-crosser [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 82.54 yr (30149 days)
Aphelion 2.8408 AU (424.98 Gm)
Perihelion 1.6141 AU (241.47 Gm)
2.2274 AU (333.21 Gm)
Eccentricity 0.27538
3.32 yr (1214.2 d)
345.83°
0° 17m 47.328s / day
Inclination 5.3634°
236.38°
99.862°
Earth MOID 0.615252 AU (92.0404 Gm)
Jupiter MOID 2.57267 AU (384.866 Gm)
Jupiter Tisserand parameter 3.588
Physical characteristics
Dimensions 7.80 km[4]
3.65±0.45 km[5]
7.25 km (derived)[3]
Mean radius
 3.90±0.35 km
2.878 h (0.1199 d)[1][6]
2.8785±0.0001 h[7]
2.879±0.002 h[8]
2.87797±0.00002 h[lower-alpha 1]
0.4598[4]
0.529±0.133[5]
0.1339 (derived)[3]
0.4598±0.095[1]
SMASS = Sq
S [3]
13.5

    1293 Sonja, provisional designation 1933 SO, is a stony asteroid and sizable eccentric Mars-crosser from the innermost regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 26 September 1933.[9] Two nights later, the body was independently discovered by Soviet–Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[2]

    The S-type asteroid, classified as a Sq-subtype in the SMASS taxonomy, orbits the Sun at a distance of 1.6–2.8 AU once every 3 years and 4 months (1,214 days). Its orbit shows an eccentricity of 0.28 and is tilted by 5 degrees to the plane of the ecliptic. It has a well-defined, concurring rotation period of 2.88 hours, measured by several independent photometric light-curve observations.[6][7][8][lower-alpha 1] Based on the surveys carried out by the Infrared Astronomical Satellite, IRAS, and the Japanese Akari satellite, it is an extraordinarily bright body with an geometric albedo of 0.46 and 0.53, respectively.[4][5] This would make it the Mars-crossing asteroid with the highest known albedo. However, the Collaborative Asteroid Lightcurve Link (CALL) derives a much lower albedo of 0.13 from the available data.[3]

    It is unknown as to whether the name "Sonja" refers to any known place, person or occurrence.[2]

    References

    1. 1 2 Pravec (2008) web: rotation period 2.87797±0.00002 hours with a brightness amplitude of 0.16 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1293) Sonja
    1. 1 2 3 4 "JPL Small-Body Database Browser: 1293 Sonja (1933 SO)" (2015-04-22 last obs.). Jet Propulsion Laboratory. Retrieved 28 April 2016.
    2. 1 2 3 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1293) Sonja. Springer Berlin Heidelberg. p. 106. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 5 "LCDB Data for (1293) Sonja". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 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 November 2015.
    5. 1 2 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
    6. 1 2 Higgins, David; Goncalves, Rui M. D. (March 2007). "Asteroid Lightcurve Analysis at Hunters Hill Observatory and Collaborating Stations - June-September 2006". The Minor Planet Bulletin 34 (1): 16–18. Bibcode:2007MPBu...34...16H. ISSN 1052-8091. Retrieved November 2015.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1293) Sonja". Geneva Observatory. Retrieved November 2015.
    8. 1 2 Benishek, Vladimir (March 2008). "CCD Photometry of Seven Asteroids at the Belgrade Astronomical Observatory". The Minor Planet Bulletin 35 (1): 28–30. Bibcode:2008MPBu...35...28B. ISSN 1052-8091. Retrieved November 2015.
    9. ↑ "1293 Sonja (1933 SO)". Minor Planet Center. Retrieved November 2015.

    External links


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