_Ueta.png) Shape model ofUeta from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | T. Mitani |
| Discovery site | Kwasan Obs. (377) |
| Discovery date | 11 October 1953 |
| Designations | |
| (1619) Ueta | |
Named after | Mr Ueta (observatory's director)[2] |
| 1953 TA · 1926 RR 1931 AO · 1940 YJ 1951 AG1 · 1978 GM | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.68 yr (31,293 days) |
| Aphelion | 2.6368AU |
| Perihelion | 1.8454 AU |
| 2.2411 AU | |
| Eccentricity | 0.1766 |
| 3.35yr (1,225 days) | |
| 5.9446° | |
| 0° 17m 37.68s / day | |
| Inclination | 6.2142° |
| 61.494° | |
| 328.18° | |
| Physical characteristics | |
| Dimensions | 7.13±0.40 km[4] 8.965±0.124 km[5] 9.927±0.066 km[6] 11.04 km(calculated)[3] |
| 2.717943±0.000005h[7] 2.7180±0.0005 h[8] 2.718238±0.000001 h[9] 2.720±0.002 h[10] 2.720±0.005 h[11] 2.94 h(dated)[12] | |
| 0.20(assumed)[3] 0.2517±0.0317[6] 0.479±0.056[4] | |
| Tholen =S[1] · S[3][13] B–V = 0.900[1] U–B = 0.546[1] | |
| 12.48±0.28[13] · 12.15[1][3][4][6] | |
1619 Ueta, provisional designation1953 TA, is a stonyasteroid from the inner regions of theasteroid belt, approximately 11 kilometers in diameter. It was discovered on 11 October 1953, by Japanese astronomerTetsuyasu Mitani atKyoto University'sKwasan Observatory (377), near Kyoto, Japan.[14] It was named after the former director of the discovering observatory.[2]
Ueta is aS-type asteroid, that orbits the Sun in theinner main-belt at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,225 days). Its orbit has aneccentricity of 0.18 and aninclination of 6° with respect to theecliptic.[1]
It was first identified as1926 RR atJohannesburg in 1926.Ueta'sobservation arc begins 22 years prior to its official discovery observation with aprecovery taken atLowell Observatory in 1931.[14]
Several rotationallightcurves ofUeta were obtained fromphotometric observations. Best rated lightcurves were obtained by astronomersRobert Stephens andDavid Higgins in September 2009, securing an identicalrotation period of 2.720 hours with a brightness variation of 0.35 and 0.39magnitude, respectively (U=3/3).[10][11] Modeled lightcurves from various photometric data sources also gave a similar period of 2.717943 and 2.718238 hours (U=n.a.).[7][9]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Ueta measures between 7.13 and 9.93 kilometers in diameter, and its surface has analbedo between 0.251 and 0.479.[4][5][6] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.04 kilometers with anabsolute magnitude of 12.15.[3]
Ueta was named by the discoverer for the former Director of Kwasan Observatory(also see§ External links) who encouraged him to keep on with his observations ofminor planets andcomets.[2] The officialnaming citation was published by theMinor Planet Center on 1 February 1965 (M.P.C. 2347).[15]
