6980 Kyusakamoto

From Wikipedia, the free encyclopedia
Jump to: navigation, search
6980 Kyusakamoto
Discovery [1]
Discovered by K. Endate
K. Watanabe
Discovery site Kitami Obs.
Discovery date 16 September 1993
MPC designation 6980 Kyusakamoto
Named after
Kyu Sakamoto
(Japanese singer)[2]
1993 SV1 · 1979 WH7
1988 RU13
main-belt · Koronis[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 36.57 yr (13,359 days)
Aphelion 2.9654 AU
Perihelion 2.7031 AU
2.8342 AU
Eccentricity 0.0463
4.77 yr (1,743 days)
0° 12m 23.76s / day
Inclination 3.2910°
Jupiter Tisserand parameter 3.3080
Physical characteristics
Dimensions 8.791±0.081 km[4][5]
8.98 km (calculated)[3]
3.2526±0.0042 h (R)[6]
3.2529±0.0042 h (S)[6]
0.24 (assumed)[3]
12.2[4] · 12.367±0.002 (R)[6] · 12.4[1][3] · 12.45±0.07[7] · 12.966±0.003 (S)[6]

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.[8]

The S-type asteroid 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 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.[1] The first precovery was taken at Crimea-Nauchnij in 1979, extending the asteroid's observation arc by 14 years prior to its discovery.[8]

A rotational light-curve was obtained through photometric observations at the U.S. Palomar Transient Factory, California, in August 2012. The light-curve 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).[6]

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 8.8 kilometers in diameter and its surface has a high albedo of 0.30,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and calculates a slightly larger diameter of 9.0 kilometers.[3]

The minor planet was named in memory of Japanese popular singer Kyu Sakamoto (1941–1985), who died in the crash of Japan Airlines 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.[2] Naming citation was published on 5 October 1998 (M.P.C. 32789).[9]


  1. ^ a b c d "JPL Small-Body Database Browser: 6980 Kyusakamoto (1993 SV1)" (2016-06-14 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (6980) Kyusakamoto. Springer Berlin Heidelberg. p. 569. ISBN 978-3-540-00238-3. Retrieved 16 April 2016. 
  3. ^ a b c d e f "LCDB Data for (6980) Kyusakamoto". Asteroid Lightcurve Database (LCDB). Retrieved 19 May 2016. 
  4. ^ a b c d 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 May 2016. 
  5. ^ a b c 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 5 December 2016. 
  6. ^ a b c d e 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:1504.04041Freely accessible. 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 19 May 2016. 
  8. ^ a b "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[edit]