| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 11 September 1942 |
| Designations | |
| (1759) Kienle | |
Named after | Hans Kienle[2] (German astrophysicist) |
| 1942 RF · 1951 YY | |
| main-belt[1][3] · (middle) background[4][5] | |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 75.76yr (27,671 d) |
| Aphelion | 3.4829AU |
| Perihelion | 1.8201 AU |
| 2.6515 AU | |
| Eccentricity | 0.3136 |
| 4.32 yr (1,577 d) | |
| 268.08° | |
| 0° 13m 41.88s / day | |
| Inclination | 4.5585° |
| 158.71° | |
| 206.14° | |
| Physical characteristics | |
| 6.909±0.198 km[6] 7.349±0.144 km[7][8] | |
| 29.25 h[9] | |
| 0.1797[8] 0.203[6][7] | |
| S(S3OS2)[10] | |
| 13.15[1][3][6][8][11] | |
1759 Kienle, provisional designation1942 RF, is a stony backgroundasteroid from the central regions of theasteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 11 September 1942, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[1] TheS-type asteroid has a longer-than averagerotation period of 29.3 hours.[11] It was named for German astrophysicistHans Kienle.[2]
Kienle is a non-family asteroid from the main belt'sbackground population.[4][5] It orbits the Sun in thecentral asteroid belt at a distance of 1.8–3.5 AU once every 4 years and 4 months (1,577 days;semi-major axis of 2.65 AU). Its orbit has aneccentricity of 0.31 and aninclination of 5° with respect to theecliptic.[3] The body'sobservation arc begins at with its official discovery observation during the height ofWorld War II in September 1942.[1]
Thisminor planet was named after German astrophysicistHans Kienle (1895–1975), known for his work on spectrophotometry and director of several German observatories, including the discoveringHeidelberg Observatory (1950–1962). Kienle was also president ofIAU Commission 36 during the 1950s.[2] The officialnaming citation was published by theMinor Planet Center on 18 April 1977 (M.P.C. 4155).[12]
In both the Tholen- and SMASS-like taxonomy of theSmall Solar System Objects Spectroscopic Survey (S3OS2),Kienle is a stonyS-type asteroid.[4][10]
During the early 1980s, a rotationallightcurve ofKienle was obtained fromphotometric observations by American astronomerRichard Binzel using the 0.91- and 2.1-meter telescopes at the University of TexasMcDonald Observatory. Lightcurve analysis gave arotation period of 29.25 hours with a brightness amplitude of 0.30magnitude (U=2).[11][9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Kienle measures between 6.9 and 7.3 kilometers in diameter and its surface has analbedo between 0.18 and 0.20.[6][7][8] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.10 – a compromise figures between the stony inner- and carbonaceous outer-belt asteroids – and consequently calculates a larger diameter of 9.85 kilometers based on anabsolute magnitude of 13.15.[11]
