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6980 Kyusakamoto, provisional designation 1993 SV₁, is a stony Koronis asteroid from the outer region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered by Japanese astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory on 16 September 1993. The asteroid was named after Japanese singer Kyu Sakamoto.

Orbit and classification

Kyusakamoto is a member of the Koronis family, which is named after 158 Koronis and consists of about 300 known bodies with nearly ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 9 months (1,743 days). Its orbit has an eccentricity of 0.05 and an inclination of 3° with respect to the ecliptic.

In November 1979, it was first identified as 1979 WH₇ at Crimea–Nauchnij, extending the body's observation arc by 14 years prior to its official discovery observation at Kitami.

Physical characteristics

Rotation period

In August 2012, a rotational lightcurve of Kyusakamoto was obtained through photometric observations at the Palomar Transient Factory, California. The lightcurve showed a period of 3.2529±0.0042 hours with a brightness amplitude of 0.40 in magnitude (U=2). In the Mould-R filter (R), a different photometric band, the observations rendered a nearly identical period of 3.2526±0.0042 hours with an amplitude of 0.41 (U=2).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Kyusakamoto measures 8.8 kilometers in diameter and its surface has a high albedo of 0.30, while the Collaborative Asteroid Lightcurve Link assumes a stony albedo of 0.24 and calculates a slightly larger diameter of 9.0 kilometers.

Naming

This minor planet was named in memory of Japanese popular singer Kyu Sakamoto (1941–1985), who died in the crash of Japan Air Lines Flight 123, the deadliest single-aircraft accident in history. Adored as "Kyu-chan", he is best known for his hit, I Look Up As I Walk ("Sukiyaki"), which became a worldwide bestseller. The naming also refers to his collaborators Rokusuke Ei and Hachidai Nakamura, songwriter and pianist, respectively. The official naming citation was published by the Minor Planet Center on 5 October 1998 (M.P.C. 32789).

References

1. ^ "JPL Small-Body Database Browser: 6980 Kyusakamoto (1993 SV1)" (2016-11-10 last obs.). Jet Propulsion Laboratory. Retrieved 21 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(6980) Kyusakamoto". Dictionary of Minor Planet Names – (6980) Kyusakamoto. Springer Berlin Heidelberg. p. 569. doi:10.1007/978-3-540-29925-7_6220. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (6980) Kyusakamoto". Asteroid Lightcurve Database (LCDB). Retrieved 19 May 2016.
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. Retrieved 19 May 2016.
5. ^ 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. Retrieved 5 December 2016.
6. ^ 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. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 19 May 2016.
7. 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. Retrieved 19 May 2016.
8. ^ "6980 Kyusakamoto (1993 SV1)". Minor Planet Center. Retrieved 16 April 2016.
9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 May 2016.

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
• 6980 Kyusakamoto at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 6980 Kyusakamoto at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Koronis asteroids
• Discoveries by Kin Endate
• Discoveries by Kazuro Watanabe
• Named minor planets
• Astronomical objects discovered in 1993