_Euboea.png) Shape model ofEuboea from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 27 October 1927 |
| Designations | |
| (1119) Euboea | |
| Pronunciation | /juːˈbiːə/ |
Named after | Euboea(Greek island)[2] |
| 1927 UB | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 90.10 yr (32,908 days) |
| Aphelion | 3.0172AU |
| Perihelion | 2.2036 AU |
| 2.6104 AU | |
| Eccentricity | 0.1558 |
| 4.22yr (1,540 days) | |
| 190.40° | |
| 0° 14m 1.32s / day | |
| Inclination | 7.8583° |
| 57.381° | |
| 230.16° | |
| Physical characteristics | |
| Dimensions | 18.37±4.84 km[6] 25.10±8.95 km[7] 29.443±0.279 km[8] 31.46 km(derived)[9] 31.881±0.199 km[10] 31.90±0.38 km[11] |
| 11.396±0.001h[12] 11.3981±0.0005 h[13] 11.39823±0.00001 h[14] 11.41±0.01 h[15] | |
| 0.0539(derived)[9] 0.0576±0.0081[10] 0.058±0.002[11] 0.09±0.06[7] 0.15±0.07[6] 0.213±0.044[8] | |
| S(assumed)[9] | |
| 11.20[10][11] · 11.30[1][9][7] · 11.32[6] | |
1119 Euboea (/juːˈbiːə/;prov. designation:1927 UB) is abackground asteroid from the central region of theasteroid belt. It was discovered on 27 October 1927, by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[3] The asteroid has arotation period of 11.4 hours and measures approximately 30 kilometers (19 miles) in diameter. It was named for the Greek island ofEuboea.[2]
Euboea 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 thecentral asteroid belt at a distance of 2.2–3.0 AU once every 4 years and 3 months (1,540 days;semi-major axis of 2.61 AU). Its orbit has aneccentricity of 0.16 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins with a recovered observation from theLowell Observatory in April 1930, more than 2 years after to its official discovery observation.[3]
Thisminor planet was named afterEuboea, also known as "Negropont", the largest island ofGreece in theAegean Sea. Thenaming was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 105).[2]
Euboea is an assumed stonyS-type asteroid.[9]
In October 2007, a first rotationallightcurve ofEuboea was obtained from photometric observations by astronomers at theOakley Southern Sky Observatory in Australia. Lightcurve analysis gave arotation period of 11.41 hours with a brightness variation of 0.50magnitude (U=3).[15] In April 2010, a similar period of 11.396 hours and an amplitude of 0.46 magnitude was measured by French amateur astronomerPierre Antonini (U=3).[12]
In 2016, two modeled lightcurves were published using photometric data from the Lowell Photometric Database and other sources. They gave a concurring sidereal period of 11.3981 and 11.39823 hours, respectively.[13][14] Each study also determined two respectivespin axes of (79.0°, 75.0°) and (282.0°, 55.0°),[13] and (71.0°, 61.0°) and (280.0°, 54.0°)[14] inecliptic coordinates (λ, β).
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Euboea measures between 18.37 and 31.90 kilometers in diameter and its surface has analbedo between 0.0576 and 0.213.[6][7][8][10][11] TheCollaborative Asteroid Lightcurve Link derives a low albedo of 0.0539 – typical for carbonaceousC-type asteroids – and a diameter of 31.46 kilometers based on anabsolute magnitude of 11.3.[9]
