.png) Lightcurve-based 3D-model ofArabis | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 2 September 1927 |
| Designations | |
| (1087) Arabis | |
| Pronunciation | /ˈærəbɪs/[2] |
Named after | Arabis(flowering plant)[3] |
| 1927 RD · 1973 LB A917 UE | |
| main-belt · (outer) Eos[4][5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.40 yr (32,655 days) |
| Aphelion | 3.2984AU |
| Perihelion | 2.7300 AU |
| 3.0142 AU | |
| Eccentricity | 0.0943 |
| 5.23yr (1,911 days) | |
| 12.959° | |
| 0° 11m 17.88s / day | |
| Inclination | 10.061° |
| 30.425° | |
| 25.793° | |
| Physical characteristics | |
| Dimensions | 31.67 km(derived)[4] 31.75±2.5 km[6] 36.97±0.50 km[7] 37.498±0.493 km[8] 45.625±0.588 km[9] 47.98±0.80 km[10] |
| 5.794h[11] 5.794995±0.000002 h[a] 5.79500±0.00001 h[b] 5.79501±0.00005 h[12] 5.797±0.001 h[13] | |
| 0.098±0.015[10] 0.1031±0.0150[9] 0.171±0.006[7] 0.2137(derived)[4] 0.2248±0.040[6] | |
| Tholen =S[1][4] B–V = 0.823[1] U–B = 0.370[1] | |
| 9.73[1][6][7][10] · 9.75±0.26[14] · 9.79[4][9][11] | |
1087 Arabis/ˈærəbɪs/ is a stony Eoanasteroid from the outer regions of theasteroid belt, approximately 35 kilometers in diameter. It was discovered byKarl Reinmuth at theHeidelberg Observatory in 1927 and assigned the provisional designation1927 RD. The asteroid was named after the flowering plantArabis (rockcress).[15]
Arabis was officially discovered on 2 September 1927, by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[15] On the same night, it was independently discovered by Soviet-Russian astronomersSergey Belyavsky andNikolaj Ivanov at theSimeiz Observatory on the Crimean peninsula.[3] TheMinor Planet Center does not acknowledge these independent discoverers.[15]
The asteroid was first identified asA917 UE at the Simeiz Observatory in October 1917, almost 10 years prior to its official discovery observation at Heidelberg.[15]
Arabis is a member theEos family (606),[4][5] the largestasteroid family in theouter main belt consisting of nearly 10,000 known asteroids.[16]: 23 It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,911 days). Its orbit has aneccentricity of 0.09 and aninclination of 10° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Heidelberg.[15]
In theTholen classification,Arabis is a commonS-type asteroid.[1][4]
During the early 1990s, a rotationallightcurve was obtained in a photometric survey of small asteroids by European astronomers at the ChileanLa Silla Observatory using theESO 1-metre telescope. In November 2006, another lightcurve ofArabis was obtained by astronomers at theOakley Observatory in Indiana, United States. Lightcurve analysis gave two well-definedrotation periods of 5.794 and 5.797 hours with a brightness variation of 0.14 and 0.40magnitude, respectively (U=3/3).[11][13]
Between 2011 and 2017, an international collaboration modeled three lightcurves with a period of 5.794995, 5.79500 and 5.79501 hours, respectively.[12][a][b] The more recent studies also determined two spin axis of (155.0°, 25.0°) and (331.0°, 5.0°) inecliptic coordinates (λ, β).[a][b]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Arabis measures between 31.75 and 47.98 kilometers in diameter and its surface has analbedo between 0.098 and 0.2248.[6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.2137 and a diameter of 31.67 kilometers based on anabsolute magnitude of 9.79.[4]
Thisminor planet was named after the flowering plantArabis (rockcress), a genus of herbs of thebrassicaceae (known as the mustards, the crucifers, or the cabbage family). The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 102).[3]
Due to his many discoveries,Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between(1009) and(1200). This list also contained a sequence of 28 asteroids, starting with1054 Forsytia, that were all named after plants, in particularflowering plants(also see list of minor planets named after animals and plants).[17]
