Astronomy:7526 Ohtsuka

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Short description: Asteroid
7526 Ohtsuka
Discovery [1]
Discovered byT. Urata
Discovery siteOohira Stn.
Discovery date2 January 1993
Designations
(7526) Ohtsuka
Named afterKatsuhito Ohtsuka
(astronomer, curator)[2]
1993 AA · 1953 XV
1980 TD13 · 1980 VU3
1984 YK2
Minor planet categorymain-belt · (inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.31 yr (23,123 days)
|{{{apsis}}}|helion}}3.1213 AU
|{{{apsis}}}|helion}}1.8139 AU
2.4676 AU
Eccentricity0.2649
Orbital period3.88 yr (1,416 days)
Mean anomaly194.19°
Inclination4.2151°
Longitude of ascending node232.74°
151.48°
Physical characteristics
Dimensions4.71 km (calculated)[3]
6.64±0.65 km[4]
7.654±0.299 km[5][6]
9.79±0.44 km[7]
11.34±4.59 km[8]
Rotation period7.109±0.001 h[9]
Geometric albedo0.03±0.02[8]
0.062±0.006[7]
0.091±0.008[5][6]
0.110±0.031[4]
0.20 (assumed)[3]
S [3]
Absolute magnitude (H)13.70[7] · 13.8[5] · 13.90[4] · 14.0[1] · 14.16[8] · 14.93±1.67[10]


7526 Ohtsuka, provisional designation 1993 AA, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Japanese astronomer Takeshi Urata at Nihondaira Observatory Oohira Station, Japan, on 2 January 1993. The asteroid was named after Japanese astronomer Katsuhito Ohtsuka.[2]

Orbit and classification

Ohtsuka orbits the Sun in the inner main-belt at a distance of 1.8–3.1 AU once every 3 years and 11 months (1,416 days). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.[1] First observed as 1953 XV at Heidelberg, the body's observation arc begins at Palomar in 1980.[2]

Physical characteristics

Rotation period

In September 2007, a rotational lightcurve of Ohtsuka was obtained from photometric observations by Maurice Clark at the Montgomery College in Rockville, Maryland. Lightcurve analysis gave a rotation period of 7.109±0.001 hours with a brightness amplitude of 0.16 magnitude ({{{1}}}).[9]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ohtsuka has an albedo in the range of 0.03 to 0.11 with a diameter between 6.64 and 11.34 kilometers.[5][4][7][8] The Collaborative Asteroid Lightcurve Link, however assumes a standard albedo for stony asteroids of 0.20 and calculates and much smaller diameter of 4.7 kilometers.[3]

Naming

This minor planet was named after Japanese astronomer Katsuhito Ohtsuka (born 1959), also curator of the Tokyo Meteor Network and its meteorite collection. Ohtsuka studies the dynamics of small Solar System bodies, in particular 3200 Phaethon and 96P/Machholz with their complex members. A dynamical relationship between Phaethon and (155140) 2005 UD was discovered by him in 2005.[2] The official naming citation was published by the Minor Planet Center on 12 July 2014 (M.P.C. 89076).[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 7526 Ohtsuka (1993 AA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007526. 
  2. ↑ 2.0 2.1 2.2 2.3 "7526 Ohtsuka (1993 AA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=7526. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "LCDB Data for (7526) Ohtsuka". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7526%7COhtsuka. 
  4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. 
  5. ↑ 5.0 5.1 5.2 5.3 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. 
  6. ↑ 6.0 6.1 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. 
  7. ↑ 7.0 7.1 7.2 7.3 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)
  8. ↑ 8.0 8.1 8.2 8.3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  9. ↑ 9.0 9.1 Clark, Maurice (October 2008). "Asteroid Lightcurve Observations". The Minor Planet Bulletin 35 (4): 152–154. ISSN 1052-8091. Bibcode: 2008MPBu...35..152C. 
  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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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