| Discovery[1] | |
|---|---|
| Discovered by | A. Mrkos |
| Discovery site | Kleť Obs. |
| Discovery date | 24 February 1987 |
| Designations | |
| (4176) Sudek | |
Named after | Josef Sudek[1] (Czech photographer) |
| 1987 DS · 1949 FF1 1952 VC · 1974 TC1 1979 SX5 · 1982 FO | |
| main-belt[1][2] · (outer) Themis[3][4] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.97yr (23,731 d) |
| Aphelion | 3.5436AU |
| Perihelion | 2.6582 AU |
| 3.1009 AU | |
| Eccentricity | 0.1428 |
| 5.46 yr (1,994 d) | |
| 275.67° | |
| 0° 10m 49.8s / day | |
| Inclination | 2.5994° |
| 114.33° | |
| 356.06° | |
| Physical characteristics | |
| 14.51±3.83 km[5] 15.86 km(calculated)[4] 17.87±0.77 km[6] 17.96±2.11 km[7] 18.858±0.243 km[8][9] | |
| 8.164±0.0092 h[10] | |
| 0.08(assumed)[4] 0.095±0.019[8] 0.095±0.033[7][9] 0.097±0.009[6] 0.12±0.11[5] | |
| C(assumed)[4] | |
| 11.8[9] 11.90[5][6][7] 11.909±0.002(R)[10] 12.0[2] 12.19±0.18[11] 12.36[4] | |
4176 Sudek, provisional designation1987 DS, is a Themistianasteroid from the outer regions of theasteroid belt, approximately 17 kilometers (11 miles) in diameter. It was discovered on 24 February 1987, by Czech astronomerAntonín Mrkos at theKleť Observatory in the Czech Republic.[1] The presumedC-type asteroid has arotation period of 8.16 hours.[4] It was named in memory of Czech photographerJosef Sudek.[1]
Sudek is a Themistian asteroid that belongs to theThemis family (602),[4][3] a very largefamily of carbonaceous asteroids, named after24 Themis.[12]
It orbits theSun in theouter main-belt at a distance of 2.7–3.5 AU once every 5 years and 6 months (1,994 days;semi-major axis of 3.1 AU). Its orbit has aneccentricity of 0.14 and aninclination of 3° with respect to theecliptic.[2] The asteroid was first observed as1949 FF1 atSimeiz Observatory in March 1949. The body'sobservation arc begins with its observation as1952 VC atGoethe Link Observatory in November 1952.[1]
On 21 January 2014Sudek, at magnitude 15.5,occulted the star 2UCAC 39655315 in the constellationGemini during which themagnitude dropped from 11.8 (star) to 15.5 (asteroid). This event was visible over parts of Japan and China.[13]
Sudek is an assumed carbonaceousC-type asteroid,[4] in line with the Themis family's overallspectral type.[12]: 23
In September 2012, a rotationallightcurve ofSudek was obtained fromphotometric observations in the R-band by astronomers at thePalomar Transient Factory in California. Lightcurve analysis gave arotation period of 8.164 hours with a brightness amplitude of 0.32 magnitude (U=2).[10]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Sudek measures between 14.51 and 18.858 kilometers in diameter and its surface has analbedo between 0.095 and 0.12.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 15.86 kilometers based on anabsolute magnitude of 12.36.[4]
Based on a proposal byMiloš Tichý, thisminor planet was named after Czech photographerJosef Sudek (1896–1976), known for his black-and-white series of still lifes and panoramas of Prague.[1] The official naming citation was published by theMinor Planet Center on 11 February 1998 (M.P.C. 31295).[14]
