1759 Kienle, provisional designation 1942 RF, is a stony background asteroid from the central regions of the asteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 11 September 1942, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The S-type asteroid has a longer-than average rotation period of 29.3 hours.[11] It was named for German astrophysicist Hans Kienle.[2]

1759 Kienle
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date11 September 1942
MPC designation(1759) Kienle
Named after
Hans Kienle[2]
(German astrophysicist)
1942 RF · 1951 YY
main-belt[1][3] · (middle)
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc75.76 yr (27,671 d)
Aphelion3.4829 AU
Perihelion1.8201 AU
2.6515 AU
4.32 yr (1,577 d)
0° 13m 41.88s / day
Physical characteristics
Mean diameter
6.909±0.198 km[6]
7.349±0.144 km[7][8]
29.25 h[9]
S (S3OS2)[10]

Orbit and classificationEdit

Kienle is a non-family asteroid from the main belt's background population.[4][5] It orbits the Sun in the central 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 an eccentricity of 0.31 and an inclination of 5° with respect to the ecliptic.[3] The body's observation arc begins at with its official discovery observation during the height of World War II on September 1942.[1]


This minor planet was named after German astrophysicist Hans Kienle (1895–1975), known for his work on spectrophotometry and director of several German observatories, including the discovering Heidelberg Observatory (1950–1962). Kienle was also president of IAU Commission 36 during the 1950s.[2] The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4155).[12]

Physical characteristicsEdit

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Kienle is a stony S-type asteroid.[4][10]

Rotation periodEdit

During the early 1980s, a rotational lightcurve of Kienle was obtained from photometric observations by American astronomer Richard Binzel using the 0.91- and 2.1-meter telescopes at the University of Texas McDonald Observatory. Lightcurve analysis gave a rotation period of 29.25 hours with a brightness amplitude of 0.30 magnitude (U=2).[11][9]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kienle measures between 6.9 and 7.3 kilometers in diameter and its surface has an albedo between 0.18 and 0.20.[6][7][8] The Collaborative 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 an absolute magnitude of 13.15.[11]


  1. ^ a b c d e "1759 Kienle (1942 RF)". Minor Planet Center. Retrieved 10 December 2018.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1759) Kienle". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 140. doi:10.1007/978-3-540-29925-7_1760. ISBN 978-3-540-00238-3.
  3. ^ a b c d "JPL Small-Body Database Browser: 1759 Kienle (1942 RF)" (2018-06-15 last obs.). Jet Propulsion Laboratory. Retrieved 10 December 2018.
  4. ^ a b c "Asteroid 1759 Kienle". Small Bodies Data Ferret. Retrieved 10 December 2018.
  5. ^ a b "Asteroid (1759) Kienle – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 December 2018.
  6. ^ a b c d Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR–A–COMPIL–5–NEOWISEDIAM–V1.0. Bibcode:2016PDSS..247.....M. Retrieved 10 December 2018.
  7. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. (catalog)
  9. ^ a b Binzel, R. P.; Mulholland, J. D. (December 1983). "A photoelectric lightcurve survey of small main belt asteroids". Icarus. 56 (3): 519–533. Bibcode:1983Icar...56..519B. doi:10.1016/0019-1035(83)90170-7. ISSN 0019-1035.
  10. ^ a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 10 December 2018.
  11. ^ a b c d "LCDB Data for (1759) Kienle". Asteroid Lightcurve Database (LCDB). Retrieved 10 December 2018.
  12. ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External linksEdit