11949 Kagayayutaka

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11949 Kagayayutaka
Discovered byK. Endate
K. Watanabe
Discovery siteKitami Obs.
Discovery date19 September 1993
(11949) Kagayayutaka
Named after
Kagaya Yutaka (artist)[2]
1993 SD2 · 1998 QV62
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc23.70 yr (8,658 days)
Aphelion3.6359 AU
Perihelion2.5444 AU
3.0902 AU
5.43 yr (1,984 days)
0° 10m 53.04s / day
Physical characteristics
Mean diameter
22.28±6.88 km[4]
23.21 km (calculated)[3]
3.96±0.03 h[5]
0.057 (assumed)[3]
S[6] · C[3]
11.80[4] · 11.9[1][3] · 11.91±0.58[6]

11949 Kagayayutaka, provisional designation 1993 SD2, is a stony background asteroid from the outer region of the asteroid belt, approximately 23 kilometers (14 miles) in diameter. It was discovered on 19 September 1993, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory in eastern Hokkaidō, Japan.[7] The asteroid was named after Japanese artist Kagaya Yutaka.[2]

Orbit and classification[edit]

Kagayayutaka is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer main-belt at a distance of 2.5–3.6 AU once every 5 years and 5 months (1,984 days). Its orbit has an eccentricity of 0.18 and an inclination of 8° with respect to the ecliptic.[1] The body's observation arc starts with its official discovery observation.[7]


This minor planet was named after Kagaya Yutaka (born 1968), a Japanese space and digital artist and receiver of the Gold Medal in the American Digital Art Contest in 2000.[2] The approved naming citation was published by the Minor Planet Center on 10 September 2003 (M.P.C. 49674).[8]

Physical characteristics[edit]

Kagayayutaka has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey.[6]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Kagayayutaka measures 22.28 kilometers in diameter and its surface has a high albedo of 0.708,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 23.21 kilometers with an absolute magnitude of 11.9.[3]


A rotational lightcurve of Kagayayutaka was obtained from photometric observations by French astronomer René Roy in November 2015. Lightcurve analysis gave a rotation period of 3.96 hours with a brightness variation of 0.28 magnitude (U=3-).[5]


  1. ^ a b c d "JPL Small-Body Database Browser: 11949 Kagayayutaka (1993 SD2)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 24 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (11949) Kagayayutaka, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 66. doi:10.1007/978-3-540-34361-5_613. ISBN 978-3-540-34361-5.
  3. ^ a b c d e f "LCDB Data for (11949) Kagayayutaka". Asteroid Lightcurve Database (LCDB). Retrieved 22 August 2016.
  4. ^ a b c d 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. Retrieved 22 August 2016.
  5. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (11949) Kagayayutaka". Geneva Observatory. Retrieved 22 August 2016.
  6. ^ a b c 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 22 August 2016.
  7. ^ a b "11949 Kagayayutaka (1993 SD2)". Minor Planet Center. Retrieved 22 August 2016.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 August 2016.

External links[edit]