_Mitaka.png) Modelled shape ofMitaka from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | O. Oikawa |
| Discovery site | Tokyo Astronomical Obs. |
| Discovery date | 17 November 1927 |
| Designations | |
| (1088) Mitaka | |
Named after | Mitaka[2](Japanese village) |
| 1927 WA · 1942 FR 1953 VW3 · 1971 BE A917 RA | |
| Orbital characteristics[3] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.22 yr (32,224 days) |
| Aphelion | 2.6328AU |
| Perihelion | 1.7722 AU |
| 2.2025 AU | |
| Eccentricity | 0.1954 |
| 3.27yr (1,194 days) | |
| 200.92° | |
| 0° 18m 5.4s / day | |
| Inclination | 7.6514° |
| 54.495° | |
| 319.50° | |
| Physical characteristics | |
| 11.33±2.51 km[6] 13.35±0.75 km[7] 15.137±0.131 km[8] 15.957±0.030 km[9] 16.016 km[10] 16.02 km(taken)[11] | |
| 3.027±0.003 h[12] 3.0353±0.0005 h[13] 3.035377 h[14] 3.035378±0.000005 h[15] 3.0354±0.0002 h[16] 3.0361±0.0007 h[16] 3.049±0.005h[17] | |
| 0.1549[10] 0.1588±0.0204[9] 0.173±0.025[8] 0.276±0.034[7] 0.37±0.16[6] | |
| 11.39[3][7] · 11.55[6] · 11.62[11][9] · 11.62±0.08[10][17] | |
1088 Mitaka (prov. designation:1927 WA) is a brightbackground asteroid from the inner regions of theasteroid belt. It was discovered on 17 November 1927, by Japanese astronomerOkuro Oikawa at the oldTokyo Astronomical Observatory in Japan.[1] The stonyS-type asteroid has a notably shortrotation period of 3.0 hours and measures approximately 15 kilometers (9.3 miles) in diameter. It was named after the Japanese village ofMitaka.[2]
Mitaka is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5] It orbits the Sun in theinner asteroid belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,194 days). Its orbit has aneccentricity of 0.20 and aninclination of 8° with respect to theecliptic.[3] The asteroid was first observed asA917 RA at theSimeiz Observatory on 11 September 1917. The body'sobservation arc begins at Tokyo in December 1927, one month after its official discovery observation.[1]
Thisminor planet was named after the Japanese village ofMitaka, where the discoveringTokyo Astronomical Observatory was located. Nowadays the city of Mitaka hosts the headquarters of theNational Astronomical Observatory of Japan with theTokyo Photoelectric Meridian Circle, public relation and data centers, and several telescopes. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 103).[2]
Mitaka is a common, stonyS-type asteroid in both theTholen and Bus–BinzelSMASS classification.[3][11]
Several rotationallightcurves ofMitaka have been obtained fromphotometric observations since 1989.[12][13][16][17] Analysis of the best rated lightcurve by French amateur astronomerPierre Antonini gave arotation period of 3.0361 hours with a consolidated brightness variation of 0.23 to 0.62magnitude (U=3).[11][16]
In 2009 and 2011, modelling ofMitaka's lightcurve using photometric data from theUS Naval Observatory, the Uppsala Asteroid Photometric Catalogue (UAPC), thePalmer Divide Observatory's archive, thePalomar Transient Factory survey, and from individual observers, gave a concurring rotation period of 3.035377 and 3.035378 hours.[14][15] The modeled lightcurves also gave aspin axis of (115.0°, 46.0°) and (278.0°, −72.0°),[14] as well as (280.0°, −71.0°) inecliptic coordinates (λ, β).[15]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Mitaka measures between 11.33 and 16.016 kilometers in diameter and its surface has analbedo between 0.1549 and 0.37.[6][7][8][9][10] TheCollaborative Asteroid Lightcurve Link adoptsPetr Pravec's revised WISE results with an albedo of 0.1549 and takes a diameter of 16.02 kilometers based on anabsolute magnitude of 11.62.[11]
