| Discovery[1] | |
|---|---|
| Discovered by | S. Ueda H. Kaneda |
| Discovery site | Kushiro Obs. (399) |
| Discovery date | 28 October 1987 |
| Designations | |
| (4282) Endate | |
Named after | Kin Endate (amateur astronomer)[2] |
| 1987 UQ1 · 1959 EJ 1983 RT | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 61.89 yr (22,605 days) |
| Aphelion | 2.7389AU |
| Perihelion | 2.0449 AU |
| 2.3919 AU | |
| Eccentricity | 0.1451 |
| 3.70yr (1,351 days) | |
| 6.4722° | |
| 0° 15m 59.04s / day | |
| Inclination | 2.7202° |
| 325.81° | |
| 101.31° | |
| 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] |
| 34h[3] | |
| 0.038±0.050[7] 0.04±0.02[5] 0.058±0.005[6] 0.13±0.08[4] 0.20(assumed)[3] | |
| S[3] | |
| 13.30[6] · 13.48[7] · 13.50[4] · 13.6[1][3] · 13.93[5] | |
4282 Endate, provisional designation1987 UQ1, is anasteroid from the inner regions of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 28 October 1987, by Japanese astronomersSeiji Ueda andHiroshi Kaneda at Kushiro Observatory (399) in Japan.[8] It was named for amateur astronomerKin Endate.[2]
Endate is a presumed stonyS-type asteroid. It orbits the Sun in theinner main-belt at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,351 days). Its orbit has aneccentricity of 0.15 and aninclination of 3° with respect to theecliptic.[1] The firstprecovery was taken atPalomar Observatory in 1954, extending the body'sobservation arc by 33 years prior to its official discovery observation.[8]
In April 2014, a rotationallightcurve ofEndate was obtained from photometric observations by Hungarian astronomer Gyula M. Szabó. Lightcurve analysis gave it a longer-than averagerotation period of 34 hours with a brightness amplitude of 0.5magnitude (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-calledslow rotators, which take at least 100 hours to rotate once around their axis.
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Endate measures between 7.386 and 13.73 kilometers in diameter and its surface has analbedo between 0.038 and 0.15.[4][5][6][7] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and consequently calculates a smaller diameter of 5.66 kilometers.[3]
Thisminor planet was named in honor of Japanese amateur astronomerKin Endate fromBihoro in northern Japan. He is a prolific observer anddiscoverer of minor planets.[2] The official naming citation was published by theMinor Planet Center on 8 July 1990 (M.P.C. 16593).[9]
