_Colchis.png) Shape model ofColchis from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 3 October 1929 |
| Designations | |
| (1135) Colchis | |
| Pronunciation | /ˈkɒlkɪs/[2] |
Named after | Colchis(ancient Kingdom)[3] |
| 1929 TA · 1936 FJ1 1940 EP · 1954 LL 1958 FO · A911 MJ A916 UH | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.15 yr (32,198 days) |
| Aphelion | 2.9744AU |
| Perihelion | 2.3558 AU |
| 2.6651 AU | |
| Eccentricity | 0.1160 |
| 4.35yr (1,589 days) | |
| 87.849° | |
| 0° 13m 35.4s / day | |
| Inclination | 4.5409° |
| 350.73° | |
| 3.6675° | |
| Physical characteristics | |
| 45.341±12.31 km[7] 46.82±0.65 km[8] 47.07±13.06 km[9] 49.12±16.46 km[10] 49.805±0.795 km[11] 50.50 km(derived)[12] 50.592±0.953 km[13] 50.64±1.5 km[14] | |
| 23.41±1.090h[15] 23.47±0.01 h[16] 23.47±0.05 h[17] 23.4827±0.0001 h[18] 23.4830±0.0005 h[19] | |
| 0.0437(derived)[12] 0.05±0.03[9][10] 0.0532±0.0329[7] 0.057±0.010[13] 0.0573±0.004[14] 0.0592±0.0083[11] 0.068±0.002[8] | |
| SMASS =Xk[1] · P[11] | |
| 10.20[8][11][14] · 10.260±0.180(R)[15] · 10.50[1][12][7][10] · 10.64[9] | |
1135 Colchis (/ˈkɒlkɪs/);prov. designation:1929 TA) is abackground asteroid from the central region of theasteroid belt. It was discovered on 3 October 1929, by Soviet astronomerGrigory Neujmin at theSimeiz Observatory on the Crimean peninsula.[4] TheX-type asteroid has arotation period of hours 23.5 and measures approximately 49 kilometers (30 miles) in diameter. It was named for the ancient Kingdom ofColchis.[3]
Colchis is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[5][6] It orbits the Sun in thecentral main-belt at a distance of 2.4–3.0 AU once every 4 years and 4 months (1,589 days;semi-major axis 2.67 AU). Its orbit has aneccentricity of 0.12 and aninclination of 5° with respect to theecliptic.[1] The asteroid was first observed asA911 MJ atJohannesburg Observatory in June 1911. The body'sobservation arc begins atLowell Observatory in September 1929, or four days prior its official discovery observation at Simeiz.[4]
Thisminor planet was named after the ancient Kingdom ofColchis, bordering on Black Sea south of the Caucasus mountains, in what is now part ofGeorgia.[3] Thenaming was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 106).[3]
In theSMASS classification,Colchis is a Xk-subtype that transitions between theX- andK-type asteroids.[1] Conversely, theWide-field Infrared Survey Explorer characterizes it as a primitiveP-type asteroid.[11]
In March 2001, a rotationallightcurve ofColchis was obtained from photometric observations byRobert Stephens. Lightcurve analysis gave arotation period of 23.47 hours with a brightness variation of 0.45magnitude (U=2).[16] In September 2016, French amateur astronomerPatrick Sogorb measured an identical period and an amplitude of 0.46 magnitude (U=2).[17] A similar period of 23.41 hours with an amplitude of 0.33 magnitude was obtained by astronomers at thePalomar Transient Factory in January 2014.[15]
In 2016, two modeled lightcurves using photometric data from the Lowell Photometric Database (LPD) and other sources, gave a concurring period of 23.4827 and 23.4830 hours, respectively. Each modeled lightcurve also determined twospin axis of (139.0°, −58.0°) and (330.0°, −81.0°), as well as (7.0°, −54.0°) and (168.0°, −56.0°) inecliptic coordinates (λ, β), respectively.[18][19]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA's WISE telescope,Colchis measures between 45.341 and 50.64 kilometers in diameter and its surface has analbedo between 0.05 and 0.068.[7][8][9][10][11][13][14]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0437 and a diameter of 50.50 kilometers based on anabsolute magnitude of 10.5.[12]
