_Illyria.png) Modelled shape ofIllyria from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 9 September 1929 |
| Designations | |
| (1160) Illyria | |
| Pronunciation | /ɪˈlɪriə/[2] |
Named after | Illyria(region on theBalkans)[3] |
| 1929 RL · 1962 WA | |
| main-belt · (middle) Eunomia[4] · Maria[5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.73 yr (32,045 days) |
| Aphelion | 2.8628AU |
| Perihelion | 2.2591 AU |
| 2.5610 AU | |
| Eccentricity | 0.1179 |
| 4.10yr (1,497 days) | |
| 166.36° | |
| 0° 14m 25.8s / day | |
| Inclination | 14.963° |
| 3.7920° | |
| 4.6994° | |
| Physical characteristics | |
| Dimensions | 12.73±1.07 km[6] 13.85±0.49 km[7] 13.88 km(calculated)[4] 13.977±0.227 km[8] 14.767±0.219 km[9] |
| 4.1025±0.0002h[10] 4.10295±0.00005 h[11] 4.104±0.001 h[12] 4.3±0.3 h(poor)[13] | |
| 0.21(assumed)[4] 0.2242±0.0366[9] 0.249±0.014[8] 0.291±0.312[6] 0.349±0.028[7] | |
| S(assumed)[4] | |
| 11.10[7] · 11.16±0.38[14] · 11.4[9] · 11.43[6] · 11.6[1][4] | |
1160 Illyria, provisional designation1929 RL, is a stony Mariaasteroid from the central regions of theasteroid belt, approximately 13 kilometers in diameter. It was discovered on 9 September 1929, by German astronomerKarl Reinmuth at theHeidelberg Observatory in southwest Germany.[15] The asteroid was named after the ancient region ofIllyria, located on the Balkan Peninsula.[3]
Based on theHierarchical Clustering Method, which uses a body'sproper orbital elements,Illyria is a member of theMaria family (506),[5][11]: 18 a large intermediate beltfamily of stony asteroids.[16] It has also been grouped into theEunomia family (502), an even larger family with more than 5,000 known members.[4]
Illyria orbits the Sun in thecentral asteroid belt at a distance of 2.3–2.9 AU once every 4 years and 1 month (1,497 days;semi-major axis of 2.56 AU). Its orbit has aneccentricity of 0.12 and aninclination of 15° with respect to theecliptic.[1] The body'sobservation arc begins with a recovery observation atLowell Observatory in October 1929, three weeks after its official discovery observation at Heidelberg.[15]
Illyria is an assumed stonyS-type asteroid,[4] which agrees with the overallspectral type of both the Maria and Eunomia family.[16]: 23
Several rotationallightcurves ofIllyria have been obtained from photometric observations since 2007.[10][12][13] Lightcurve analysis gave a consolidatedrotation period of 4.1025 hours with a brightness amplitude between 0.56 and 0.91magnitude (U=3).[4][10]
In 2013, an international study also modeled the asteroid's lightcurve from photometric data. It gave a concurring period of 4.10295 hours and determined a partialspin axis of (n.a., 47.0°) inecliptic coordinates (λ, β).[11]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Illyria measures between 12.73 and 14.767 kilometers in diameter and its surface has analbedo between 0.2242 and 0.349.[6][7][8][9]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the parent body of the Eunomia family, and calculates a diameter of 13.88 kilometers based on anabsolute magnitude of 11.6.[4]
Thisminor planet was named afterIllyria, an ancient region on theBalkans which borders theAdriatic Sea. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 108).[3]
