![]()
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] | |
1633 Chimay, provisional designation 1929 EC, is a Themistian asteroid from the outer region of the asteroid belt, approximately 37 kilometers in diameter.
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]
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]
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]
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]