_Kres%25C3%25A1k.png) Shape model ofKresák from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 14 January 1942 |
| Designations | |
| (1849) Kresák | |
Named after | Ľubor Kresák (Slovak astronomer)[2] |
| 1942 AB · 1948 EO 1951 WC2 | |
| main-belt · (outer)[3] Eos[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 75.29 yr (27,500 days) |
| Aphelion | 3.1076AU |
| Perihelion | 3.0009 AU |
| 3.0542 AU | |
| Eccentricity | 0.0175 |
| 5.34yr (1,950 days) | |
| 353.13° | |
| 0° 11m 4.92s / day | |
| Inclination | 10.765° |
| 50.363° | |
| 143.25° | |
| Physical characteristics | |
| Dimensions | 21.776±2.427 km[5] 26.14 km(calculated)[3] |
| 19.1008±0.0153h[6] | |
| 0.057(assumed)[3] 0.114±0.032[5] | |
| C(assumed)[3] | |
| 11.191±0.002(R)[6] · 11.28[5] · 11.5[1] · 11.61±0.32[7] · 11.64[3] | |
1849 Kresák (prov. designation:1942 AB) is a carbonaceousEos asteroid from the outer region of theasteroid belt, approximately 24 kilometers in diameter. It was discovered by German astronomerKarl Reinmuth atHeidelberg Observatory in the middle of World War II on 14 January 1942.[8] The asteroid was later named after Slovak astronomerĽubor Kresák.[2]
Kresák is a member of theEos family (606), the largestasteroid family in theouter main belt consisting of nearly 10,000 asteroids.[4][9]: 23 It orbits the Sun in theouter main-belt at a distance of 3.0–3.1 AU once every 5 years and 4 months (1,950 days). Its orbit has aneccentricity of 0.02 and aninclination of 11° with respect to theecliptic.[1] The body'sobservation arc begins 6 days after its official discovery observation.[8]
Thisminor planet was named in honor of Slovak astronomerĽubor Kresák (1927–1994) from theSlovak Academy of Sciences in Bratislava and president ofIAU's Commission 20 in the 1970s.[2]
Kresák is known for his theoretical work onmeteors and the question of their relationship with comets and minor planets, as well as for the rediscovery of the short-period comet41P/Tuttle–Giacobini–Kresák at theSkalnaté Pleso Observatory in 1951.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3935).[10]
Kresák has been characterized as a carbonaceousC-type asteroid.[3]
In January 2012, a rotationallightcurve ofKresák was obtained from photometric observations at thePalomar Transient Factory in California. In the R-band, it gave arotation period of 19.10 hours with a brightness variation of 0.19magnitude (U=2).[6]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Kresák measures 21.7 kilometers in diameter, and its surface has analbedo of 0.114,[5] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 26.1 kilometers with anabsolute magnitude of 11.64.[3]
