2228 Soyuz-Apollo

2228 Soyuz-Apollo
Discovery [1]
Discovered by N. Chernykh
Discovery site Crimean Astrophysical Obs.
Discovery date 19 July 1977
Designations
MPC designation (2228) Soyuz-Apollo
Named after
 Apollo-Soyuz (Test Project) [2]
1977 OH · 1933 SK1
1952 DT1 · 1963 DD
1973 YN3
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 53.75 yr (19,632 days)
Aphelion 3.7135 AU
Perihelion 2.5605 AU
3.1370 AU
Eccentricity 0.1838
5.56 yr (2,029 days)
341.70°
0° 10m 38.64s / day
Inclination 1.9888°
140.40°
285.71°
Physical characteristics
Dimensions 23.55 km (calculated)[3]
26.080±0.295 km[4][5]
28.26±0.49 km[6]
5.3846±0.0007 h[7]
5.3868±0.0013 h[8]
5.4±0.05 h[7]
6.12 h[9]
0.08 (assumed)[3]
0.101±0.004[6]
0.113±0.020[5]
0.1134±0.0198[4]
C [3]
10.9[4][6] · 11.21±0.42[10] · 11.5[1][3] · 11.848±0.002 (S)[8]

    2228 Soyuz-Apollo, provisional designation 1977 OH, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 19 July 1977, by Soviet–Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on the Crimean peninsula.[11] It was named after the Apollo–Soyuz Test Project.[2]

    Orbit and classification

    The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,029 days). Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic.[1]

    Physical characteristics

    It has a rotation period of 5.4 hours and an albedo of 0.10 and 0.11, as determined by the space-based Akari and WISE missions, respectively,[6][4] while the Collaborative Asteroid Lightcurve Link (CALL) assumes a lower albedo of 0.08.[3]

    Naming

    This minor planet was named after the joint Soviet-American space flight, the Apollo–Soyuz Test Project, carried on in 1975. The reversal of the names, "Soyuz–Apollo" rather than "Apollo–Soyuz", was not political, but to prevent confusion with the asteroid 1862 Apollo.[2] The official naming citation was published by the Minor Planet Center on 1 March 1981 (M.P.C. 5850).[12]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 2228 Soyuz-Apollo (1977 OH)" (2016-11-23 last obs.). Jet Propulsion Laboratory. Retrieved 12 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2228) Soyuz-Apollo. Springer Berlin Heidelberg. p. 181. ISBN 978-3-540-00238-3. Retrieved 7 December 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (2228) Soyuz-Apollo". Asteroid Lightcurve Database (LCDB). Retrieved 7 December 2016.
    4. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. Bibcode:2011ApJ...741...90M. arXiv:1109.6407 Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 7 December 2016.
    5. 1 2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. Bibcode:2011ApJ...741...68M. arXiv:1109.4096 Freely accessible. doi:10.1088/0004-637X/741/2/68. Retrieved 7 December 2016.
    6. 1 2 3 4 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 7 December 2016.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (2228) Soyuz-Apollo". Geneva Observatory. Retrieved 7 December 2016.
    8. 1 2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. Bibcode:2015AJ....150...75W. arXiv:1504.04041 Freely accessible. doi:10.1088/0004-6256/150/3/75. Retrieved 7 December 2016.
    9. ↑ Almeida, R.; Angeli, C. A.; Duffard, R.; Lazzaro, D. (February 2004). "Rotation periods for small main-belt asteroids". Astronomy and Astrophysics: 403–406. Bibcode:2004A&A...415..403A. doi:10.1051/0004-6361:20034585. Retrieved 7 December 2016.
    10. ↑ 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762 Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 7 December 2016.
    11. ↑ "2228 Soyuz-Apollo (1977 OH)". Minor Planet Center. Retrieved 7 December 2016.
    12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 December 2016.
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