4282 Endate

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4282 Endate
Discovery [1]
Discovered by S. Ueda
H. Kaneda
Discovery site Kushiro Obs.
Discovery date 28 October 1987
MPC designation (4282) Endate
Named after
Kin Endate
(amateur astronomer)[2]
1987 UQ1 · 1959 EJ
1983 RT
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 61.89 yr (22,605 days)
Aphelion 2.7392 AU
Perihelion 2.0448 AU
2.3920 AU
Eccentricity 0.1451
3.70 yr (1,351 days)
0° 15m 59.04s / day
Inclination 2.7204°
Physical characteristics
Dimensions 5.66 km (calculated)[3]
7.386±1.581 km[4]
11.52±3.27 km[5]
12.12±0.49 km[6]
13.73±7.43 km[7]
34 h[3]
0.20 (assumed)[3]
13.30[6] · 13.48[7] · 13.50[4] · 13.6[1][3] · 13.93[5]

4282 Endate, provisional designation 1987 UQ1, is an asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 28 October 1987, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory (399) in Japan.[8] It was named for amateur astronomer Kin Endate.[2]


Endate is a presumed stony S-type asteroid. It orbits the Sun at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,351 days). Its orbit has an eccentricity of 0.15 and an inclination of 3° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1954, extending the body's observation arc by 33 years prior to its official discovery observation.[8]

In April 2014, a rotational lightcurve of Endate was obtained from photometric observations by Hungarian astronomer Gyula M. Szabó. Lightcurve analysis at in gave it a longer-than average rotation period of 34 hours with a brightness amplitude of 0.5 magnitude (U=n.a.).[3] Most minor planets have a spin rate between 2 and 20 hours. Endate's rotation period is significantly longer but still much shorter than that of the so-called slow rotators, which take at least 100 hours to rotate once around their axis.

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Endate measures between 7.386 and 13.73 kilometers in diameter and its surface has an albedo between 0.038 and 0.15.[4][5][6][7] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and consequently calculates a smaller diameter of 5.66 kilometers.[3]

This minor planet was named in honor of Japanese amateur astronomer Kin Endate from Bihoro in northern Japan. He is a prolific observer and discoverer of minor planets.[2] Naming citation was published on 8 July 1990 (M.P.C. 16593).[9]


  1. ^ a b c d "JPL Small-Body Database Browser: 4282 Endate (1987 UQ1)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 10 March 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4282) Endate. Springer Berlin Heidelberg. p. 367. ISBN 978-3-540-00238-3. Retrieved 9 March 2017. 
  3. ^ a b c d e f g h "LCDB Data for (4282) Endate". Asteroid Lightcurve Database (LCDB). Retrieved 9 March 2017. 
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 9 March 2017. 
  5. ^ a b c d 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 9 March 2017. 
  6. ^ a b c d 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 9 March 2017. 
  7. ^ 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 9 March 2017. 
  8. ^ a b "4282 Endate (1987 UQ1)". Minor Planet Center. Retrieved 9 March 2017. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 March 2017. 

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