_Zeelandia.png) Shape model ofZeelandia from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. |
| Discovery date | 9 September 1934 |
| Designations | |
| (1336) Zeelandia | |
Named after | Zeeland[2] (a province of theNetherlands) |
| 1934 RW · 1929 QE 1930 XC · 1935 YF 1939 RP · A906 YO | |
| main-belt · (outer) Koronis[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.01 yr (40,913 days) |
| Aphelion | 3.0348AU |
| Perihelion | 2.6654 AU |
| 2.8501 AU | |
| Eccentricity | 0.0648 |
| 4.81yr (1,757 days) | |
| 117.20° | |
| 0° 12m 17.28s / day | |
| Inclination | 3.1972° |
| 97.420° | |
| 220.01° | |
| Physical characteristics | |
| Dimensions | 19.18±0.51 km[5] 20.99±2.1 km[3][6] 21.441±0.132 km[7] 23.056±0.108 km[8] 23.63±3.31 km[9] |
| 15.602h[10] 15.624±0.001 h[11] | |
| 0.153±0.280[9] 0.1829±0.0228[8] 0.2183±0.052[3][6] 0.232±0.045[7] 0.273±0.017[5] | |
| B–V = 0.810[1] U–B = 0.366[1] Tholen =S[1] SMASS =S[1][3] | |
| 10.66[1][3][5][6][8] · 10.71±0.58[12] · 10.79[9] · 10.94±0.02[10] | |
1336 Zeelandia, provisional designation1934 RW, is a stony Koronianasteroid from the outer regions of theasteroid belt, approximately 21 kilometers in diameter. It was discovered on 9 September 1934, by Dutch astronomerHendrik van Gent at theUnion Observatory in Johannesburg, South Africa.[13] The asteroid was named for the Dutch province ofZeeland.[2]
Zeelandia belongs to theKoronis family (605),[3][4] a very largeasteroid family of 6,000 known members with stony composition and nearly co-planarecliptical orbits.[14]
It orbits the Sun in theouter main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,757 days;semi-major axis of 2.85 AU). Its orbit has aneccentricity of 0.06 and aninclination of 3° with respect to the ecliptic.[1] In October 1905, a firstprecovery was taken at theLowell Observatory in Arizona. Its first identification asA906 YO was made at Taunton Observatory (803) in December 1906. The body'sobservation arc begins with its official discovery observation at Johannesburg in September 1934.[13]
Zeelandia has been characterized as a stonyS-type asteroid in both theTholen andSMASS classification.[1]
In March 2004, a rotationallightcurve ofZeelandia was obtained from photometric observations by a collaboration of American astronomers. Lightcurve analysis gave a well-definedrotation period of 15.602 hours with a brightness variation of 0.61magnitude (U=3).[10] The result was confirmed by photometristsPierre Antonini, Federico Manzini, Julian Oey and Frederick Pilcher, as well as Hiromi and Hiroko Hamanowa, who measured a similar period of 15.624 with an amplitude of 0.50 magnitude in April 2005 (U=3).[11]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Zeelandia measures between 19.18 and 23.63 kilometers in diameter and its surface has analbedo between 0.153 and 0.273.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2183 and a diameter of 20.99 kilometers based on anabsolute magnitude of 10.66.[3][6]
Thisminor planet was named for the Dutch province ofZeeland. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 121).[2]
