_Kate.png) Shape model ofKate from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | S. Belyavsky |
| Discovery site | Simeiz Obs. |
| Discovery date | 23 September 1917 |
| Designations | |
| (2156) Kate | |
Named after | Kate Kristensen (wife of naming astronomer)[2] |
| A917 SH · 1937 PK 1954 UT2 · 1956 GP 1957 QK · 1969 BE 1970 LK · 1974 RL1 1976 GK1 · 1979 BC | |
| main-belt · (inner) | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.61 yr (36,384 days) |
| Aphelion | 2.6942AU |
| Perihelion | 1.7900 AU |
| 2.2421 AU | |
| Eccentricity | 0.2016 |
| 3.36yr (1,226 days) | |
| 264.22° | |
| 0° 17m 36.96s / day | |
| Inclination | 5.3475° |
| 17.175° | |
| 4.7281° | |
| Physical characteristics | |
| 8.131±0.144 km[3][4] 8.61 km(calculated)[5] | |
| 5.62 h[6] 5.62215±0.00005 h[7] 5.6228±0.0003 h[a] 5.623±0.005 h[8] | |
| 0.189±0.028[4] 0.20(assumed)[5] 0.2242±0.0353[3] | |
| Tholen =S[1] · A[9] B–V = 0.916[1] U–B = 0.525[1] | |
| 12.69[1][5][3] · 13.23±1.05[9] | |
2156 Kate (prov. designation:A917 SH) is a highly elongatedbackground asteroid from the inner regions of theasteroid belt. The asteroid was discovered on 23 September 1917, by Soviet–Russian astronomerSergey Belyavsky at theSimeiz Observatory on the Crimean peninsula.[10] It was named for Kate Kristensen, wife of astronomer L. K. Kristensen.[2] The brightS-type/A-type asteroid has arotation period of 5.6 hours and measures approximately 8 kilometers (5.0 miles) in diameter.
Kate orbits the Sun in theinner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,226 days). Its orbit has aneccentricity of 0.20 and aninclination of 5° with respect to theecliptic.[1] As noprecoveries were taken, and no prior identifications were made, the asteroid'sobservation arc begins with its official discovery observation at Simeiz in 1917.[10]
Thisminor planet was named after Kate Kristensen, wife of astronomer L. K. Kristensen, who was involved in the body's orbit computation.[2] The official naming citation was published by theMinor Planet Center on 1 April 1980 (M.P.C. 5284).[11]
In theTholen classification,Kate is a commonS-type asteroid.[1] It has also been characterized as a rareA-type asteroid byPan-STARRS' large photometric survey.[9]
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A large number of rotationallightcurves were obtained fromphotometric observations. They gave a well-definedrotation period of 5.620 to 5.623 hours with a brightness variation between 0.5 and 0.9magnitude (U=3/3-).[6][7][8][a]
According to the survey carried out by theNEOWISE mission of NASA's space-basedWide-field Infrared Survey Explorer,Kate measures 8.131 kilometers in diameter and its surface has analbedo of 0.189 and 0.2242, respectively,[3][4] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.61 kilometers with anabsolute magnitude of 12.69.[5]
