1633 Chimay
Themistian asteroid
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1633 Chimay, provisional designation 1929 EC, is a Themistian asteroid from the outer region of the asteroid belt, approximately 37 kilometers in diameter.
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Lightcurve based 3D-model of Chimay | |
| Discovery[1] | |
|---|---|
| Discovered by | S. Arend |
| Discovery site | Uccle Obs. |
| Discovery date | 3 March 1929 |
| Designations | |
| (1633) Chimay | |
Named after | Chimay (Belgian town)[2] |
| 1929 EC · 1941 KF 1946 HC · 1948 RO 1951 AM · 1952 HY3 1954 SS · 1955 XN 1972 VM1 · A917 BB | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 100.02 yr (36,531 days) |
| Aphelion | 3.5907 AU |
| Perihelion | 2.7980 AU |
| 3.1943 AU | |
| Eccentricity | 0.1241 |
| 5.71 yr (2,085 days) | |
| 237.33° | |
| 0° 10m 21.36s / day | |
| Inclination | 2.6759° |
| 114.08° | |
| 65.539° | |
| Physical characteristics | |
| Dimensions | 36.07 km (derived)[3] 36.12±3.1 km (IRAS:3)[4] 36.26±0.86 km[5] 37.428±0.466[6] 37.732±0.426 km[7] |
| 6.58±0.01 h[8] 6.59064±0.00005 h[9] 6.5911±0.0001 h[10] 6.6367±0.0038 h[11] | |
| 0.0781 (derived)[3] 0.0785±0.0135[7] 0.080±0.014[6] 0.0854±0.017 (IRAS:3)[4] 0.088±0.005[5] | |
| S[3] | |
| 10.36±0.17 (R)[8] · 10.481±0.002 (R)[11] · 10.5[5][7] · 10.6[1][3] · 10.97±0.06[12] | |
It was discovered on 3 March 1929, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[13] Five nights later, the body was independently discovered by Max Wolf at Heidelberg Observatory in southern Germany.[2] It was later named for the Belgian town of Chimay.[2]
Classification and orbit
Chimay is a member of the Themis family, a dynamical family of asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.8–3.6 AU once every 5 years and 9 months (2,085 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic.[1] Chimay was first identified as A917 BB at Heidelberg in 1917, extending the body's observation arc by 12 years prior to its official discovery observation.[13]
Physical characteristics
Several rotational lightcurves were obtained from photometric observations. Lightcurve analysis gave a well-defined, concurring rotation period of 6.58–6.63 hours with a brightness variation between 0.31 and 0.58 magnitude (U=3/3-/2).[8][9][10][11][14]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chimay measures between 36.1 and 37.7 kilometers in diameter, and its surface has a low albedo between 0.079 and 0.089.[4][5][6][7] In accordance with the space-based surveys, the Collaborative Asteroid Lightcurve Link (CALL) derives an albedo of 0.078, and calculates a diameter of 36.1 kilometers. CALL also classifies Chimay as a S-type rather than a carbonaceous C-type asteroid.[3]
Naming
This minor planet was named after the Belgian town Chimay, home of the discoverer, who also co-discovered Comet Arend–Roland.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931).[15]
