_Catriona.png) Shape model ofCatriona from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 5 April 1929 |
| Designations | |
| (1116) Catriona | |
Named after | Catriona(novel by Robert Louis Stevenson)[2] |
| 1929 GD · 1926 RQ A908 AC | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.01 yr (39,815 days) |
| Aphelion | 3.5946AU |
| Perihelion | 2.2522 AU |
| 2.9234 AU | |
| Eccentricity | 0.2296 |
| 5.00yr (1,826 days) | |
| 348.27° | |
| 0° 11m 49.92s / day | |
| Inclination | 16.523° |
| 356.52° | |
| 82.666° | |
| Physical characteristics | |
| Dimensions | 36.71±0.53 km[6] 38.741±0.281 km[7] 39.02 km(derived)[8] 39.04 km[9] 39.12±0.7 km[10] 41.010±0.396 km[11] |
| 8.83±0.01h[12] 8.832 h[a][b] 10.49 h[9] 12.06 h[c] | |
| 0.1395(derived)[8] 0.1397±0.0214[11] 0.1419[9] 0.1522±0.006[10] 0.155±0.025[7] 0.175±0.006[6] | |
| C[8] | |
| 9.70[6][10][11] · 9.78[9] · 9.8[1][8] | |
1116 Catriona (prov. designation:1929 GD) is a carbonaceousasteroid from the outer regions of theasteroid belt, approximately 39 kilometers (24 miles) in diameter. It was discovered on 5 April 1929 by South African astronomerCyril Jackson at theUnion Observatory in Johannesburg.[3] The asteroid was likely named after the 1893-novelCatriona byRobert Louis Stevenson.[2]
Catriona is not a member of any identifiedasteroid family. It orbits the Sun in theouter main belt at a distance of 2.3–3.6 AU once every 5.00 years (1,826 days). Its orbit has aneccentricity of 0.23 and aninclination of 17° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Johannesburg.[3]
Thisminor planet was probably named afterCatriona, the 1893-novel byRobert Louis Stevenson (1850–1894), who was a Scottish poet, novelist and travel writer.[2] The naming citation is based onLutz Schmadel's research including feedback from R. Bremer.[2]
Catriona is an assumed carbonaceousC-type asteroid.[8]
In December 2003, the best-rated rotationallightcurve ofCatriona was obtained from photometric observations by American astronomer John Menke at his Menke Observatory inBarnesville, Maryland (noobs. code). Lightcurve analysis gave a well-definedrotation period of 8.83 hours with a notably low brightness variation of 0.09magnitude, indicative of aspheroidal shape (U=3).[12] Additional photometric observations gave a concurring period of 8.832 hours, while others gave a longer period of 10.49 and 12.06 hours (U=2/2/2/2).[9][a][b][c]
According to observations by astronomers at theRozhen Observatory in Bulgaria, as well as the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Catriona measures between 36.71 and 41.010 kilometers in diameter and its surface has analbedo between 0.1397 and 0.175.[6][7][9][10][11]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1395 and a diameter of 39.02 kilometers based on anabsolute magnitude of 9.8.[8]
