.png) Lightcurve based 3D-model ofChimay | |
| 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 | 3.5907AU |
| Perihelion | 2.7980 AU |
| 3.1943 AU | |
| Eccentricity | 0.1241 |
| 5.71yr (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±0.0001h[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 designation1929 EC, is a Themistianasteroid from the outer region of theasteroid belt, approximately 37 kilometers in diameter.
It was discovered on 3 March 1929, by Belgian astronomerSylvain Arend at theRoyal Observatory of Belgium in Uccle.[13] Five nights later, the body was independently discovered byMax Wolf atHeidelberg Observatory in southern Germany.[2] It was later named for the Belgian town ofChimay.[2]
Chimay is a member of theThemis family, a dynamical family of asteroids with nearly coplanarecliptical orbits. It orbits the Sun in theouter main-belt at a distance of 2.8–3.6 AU once every 5 years and 9 months (2,085 days). Its orbit has aneccentricity of 0.12 and aninclination of 3° with respect to the ecliptic.[1]Chimay was first identified asA917 BB at Heidelberg in 1917, extending the body'sobservation arc by 12 years prior to its official discovery observation.[13]
Several rotationallightcurves were obtained from photometric observations. Lightcurve analysis gave a well-defined, concurringrotation period of 6.58–6.63 hours with a brightness variation between 0.31 and 0.58magnitude (U=3/3-/2).[8][9][10][11][14]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Chimay measures between 36.1 and 37.7 kilometers in diameter, and its surface has a lowalbedo between 0.079 and 0.089.[4][5][6][7] In accordance with the space-based surveys, theCollaborative Asteroid Lightcurve Link (CALL) derives an albedo of 0.078, and calculates a diameter of 36.1 kilometers. CALL also classifiesChimay as aS-type rather than a carbonaceousC-type asteroid.[3]
Thisminor planet was named after the Belgian townChimay, home of the discoverer, who also co-discoveredComet Arend–Roland.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3931).[15]
