.png) Lightcurve-based 3D-model of Kuopio | |
| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 15 December 1938 |
| Designations | |
| (1503) Kuopio | |
Named after | Kuopio(Finnish town)[2] |
| 1938 XD · 1935 EF 1953 LH | |
| main-belt · (middle) Eunomia[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.34 yr (30,075 days) |
| Aphelion | 2.8995AU |
| Perihelion | 2.3499 AU |
| 2.6247 AU | |
| Eccentricity | 0.1047 |
| 4.25yr (1,553 days) | |
| 154.93° | |
| 0° 13m 54.48s / day | |
| Inclination | 12.369° |
| 316.98° | |
| 177.92° | |
| Physical characteristics | |
| Dimensions | 18.43±1.5 km[5] 18.54 km(derived)[3] 22.33±0.34 km[6] 22.985±0.964 km[7] |
| 9.577±0.0004h[8] 9.957±0.006 h[8] 9.9586±0.0005 h[9][10] 9.96±0.05 h[8] 9.98 h[11] | |
| 0.223±0.008[6] 0.2995±0.056[5] 0.3243(derived)[3] 0.399±0.262[7] | |
| S[3] | |
| 9.81[7] · 10.5[1][3] · 10.60[5][6] · 10.65±0.69[12] | |
1503 Kuopio (provisional designation1938 XD) is a stony Eunomianasteroid from the central region of theasteroid belt, approximately 19 kilometers in diameter. It was discovered on 15 December 1938, by astronomerYrjö Väisälä at theTurku Observatory in Southwest Finland.[13] The asteroid was named for the Finnish town ofKuopio.[2]
Kuopio is a member of theEunomia family (502), a prominentfamily of stonyS-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[3][4][14]: 23 It orbits the Sun at a distance of 2.3–2.9 AU once every 4 years and 3 months (1,553 days). Its orbit has aneccentricity of 0.10 and aninclination of 12° with respect to theecliptic plane.[1]
The body'sobservation arc begins with its first identification as1935 EF atYerkes Observatory in March 1935, more than 3 years prior to its official discovery observation at Turku.[13]
Several rotationallightcurves of Kuopio were obtained from photometric observations since 2001. Analysis of these lightcurves gave arotation period between 9.577 and 9.98 hours with a brightness variation of 0.01 to 0.05magnitude (U=3/3/2/2/3).[8][11]
In 2011 and 2013, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources was published. In both studies, the modeled lightcurve gave a concurring period 9.9586 hours. The 2013-publication also determined twospin axis of (170.0°, −86.0°) and (27.0°, −61.0°) inecliptic coordinates (λ, β) (U=n.a.).[9][10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE) program, Kuopio measures between 18.43 and 22.99 kilometers in diameter and its surface has analbedo between 0.223 and 0.399.[5][6][7]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.3243 and a diameter of 18.54 kilometers based on anabsolute magnitude of 10.5.[3]
Thisminor planet was named after the town ofKuopio in central Finland.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3928).[15]
