7526 Ohtsuka

7526 Ohtsuka

Discovery [1]
Discovered by	T. Urata
Discovery site	Oohira Stn.
Discovery date	2 January 1993
Designations
MPC designation	(7526) Ohtsuka
Named after	Katsuhito Ohtsuka (astronomer, curator)[2]
Alternative designations	1993 AA · 1953 XV 1980 TD13 · 1980 VU3 1984 YK2
Minor planet category	main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	63.31 yr (23,123 days)
Aphelion	3.1213 AU
Perihelion	1.8139 AU
Semi-major axis	2.4676 AU
Eccentricity	0.2649
Orbital period (sidereal)	3.88 yr (1,416 days)
Mean anomaly	194.19°
Inclination	4.2151°
Longitude of ascending node	232.74°
Argument of perihelion	151.48°
Physical characteristics
Dimensions	4.71 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]
Synodic rotation period	7.109±0.001 h[9]
Geometric albedo	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]
Spectral type	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 (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. "JPL Small-Body Database Browser: 7526 Ohtsuka (1993 AA)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
2. "7526 Ohtsuka (1993 AA)". Minor Planet Center. Retrieved 11 March 2017.
3. "LCDB Data for (7526) Ohtsuka". Asteroid Lightcurve Database (LCDB). Retrieved 11 March 2017.
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. 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. 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. 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. 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. 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.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• 7526 Ohtsuka at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 7526 Ohtsuka at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters