7526 Ohtsuka
Discovery [1]
Discovered byT. Urata
Discovery siteOohira Stn.
Discovery date2 January 1993
Designations
(7526) Ohtsuka
Named after
Katsuhito Ohtsuka
(astronomer, curator)[2]
1993 AA · 1953 XV
1980 TD13 · 1980 VU3
1984 YK2
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.31 yr (23,123 days)
Aphelion3.1213 AU
Perihelion1.8139 AU
2.4676 AU
Eccentricity0.2649
3.88 yr (1,416 days)
194.19°
Inclination4.2151°
232.74°
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]
7.109±0.001 h[9]
0.03±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]
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 (U=3-).[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 2 3 4 "JPL Small-Body Database Browser: 7526 Ohtsuka (1993 AA)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
    2. 1 2 3 4 "7526 Ohtsuka (1993 AA)". Minor Planet Center. Retrieved 11 March 2017.
    3. 1 2 3 4 5 "LCDB Data for (7526) Ohtsuka". Asteroid Lightcurve Database (LCDB). Retrieved 11 March 2017.
    4. 1 2 3 4 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. S2CID 46350317.
    5. 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". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010.
    6. 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. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.
    7. 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". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    8. 1 2 3 4 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. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
    9. 1 2 Clark, Maurice (October 2008). "Asteroid Lightcurve Observations". The Minor Planet Bulletin. 35 (4): 152–154. Bibcode:2008MPBu...35..152C. ISSN 1052-8091.
    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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 11 March 2017.
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