| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 21 April 1939 |
| Designations | |
| (1505) Koranna | |
Named after | Koranna people[2] (native South African people) |
| 1935 MD · 1939 HH 1948 MB · 1958 UM[3] | |
| main-belt · (middle) Eunomia[4] · background[5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.26 yr (30,045 days) |
| Aphelion | 3.0150AU |
| Perihelion | 2.3037 AU |
| 2.6593 AU | |
| Eccentricity | 0.1337 |
| 4.34yr (1,584 days) | |
| 15.932° | |
| 0° 13m 38.28s / day | |
| Inclination | 14.471° |
| 248.28° | |
| 342.44° | |
| Physical characteristics | |
| Dimensions | 20.46±0.76 km[6] 20.88±2.1 km[7] 21.00 km(derived)[4] 22.277±0.690 km[6] 22.83±0.88 km[8] |
| 4.45±0.15h[a] 4.451±0.001 h[9] 4.452±0.0011 h[10] | |
| 0.082±0.007[8] 0.0929±0.022[7] 0.107±0.016[6] 0.1209(derived)[4] 0.127±0.021[6] | |
| S(assumed)[4] | |
| 11.197±0.002(R)[10] · 11.30[1][4][6] · 11.47±0.63[11] · 11.60[7][8] | |
1505 Koranna (provisional designation1939 HH) is a stony Eunomiaasteroid from the central regions of theasteroid belt, approximately 21 kilometers in diameter. It was discovered on 21 April 1939, by South African astronomerCyril Jackson at theUnion Observatory in Johannesburg.[3] The asteroid was named for the nativeKoranna people of South Africa.[2]
Koranna is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[5] The asteroid has also been classified as a member of theEunomia family (502), a prominentfamily of stonyS-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[4]
It orbits the Sun in thecentral main belt at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,584 days). Its orbit has aneccentricity of 0.13 and aninclination of 14° with respect to theecliptic.[1] The asteroid was first identified in June 1935 as1935 MD atSimeiz Observatory on Crimea, where the body'sobservation arc begins the following month in July 1935.[3]
Koranna is an assumed stonyS-type asteroid.[4]
Between 2088 and 2013, three rotationallightcurves of Koranna have been obtained from photometric observations. Lightcurve analysis gave arotation period of 4.45, 4.451 and 4.452 hours with a brightness variation of 0.70, 0.55 and 0.53, respectivelymagnitude (U=2+/3/2).[9][10][a] A high brightness amplitude typically indicates that the body has an elongated, non-spherical shape.
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Koranna measures between 20.46 and 22.83 kilometers in diameter and its surface has analbedo between 0.082 and 0.127.[6][8] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1209 and a diameter of 21.00 kilometers based on anabsolute magnitude of 11.3.[4]
Thisminor planet was named after the nativeKoranna people, better known as the Griqua people of South Africa. The tribe of wanderingSan people (Bushman) lives in the southern part of theKalahari Desert in southern Africa.[2] The officialnaming citation was published by theMinor Planet Center in April 1953 (M.P.C. 909).[12]
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