1759 Kienle

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 by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	11 September 1942
Designations
MPC designation	(1759) Kienle
Named after	Hans Kienle[2] (German astrophysicist)
Alternative designations	1942 RF · 1951 YY
Minor planet category	main-belt[1][3] · (middle) background[4][5]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc	75.76 yr (27,671 d)
Aphelion	3.4829 AU
Perihelion	1.8201 AU
Semi-major axis	2.6515 AU
Eccentricity	0.3136
Orbital period (sidereal)	4.32 yr (1,577 d)
Mean anomaly	268.08°
Mean motion	0° 13m 41.88s / day
Inclination	4.5585°
Longitude of ascending node	158.71°
Argument of perihelion	206.14°
Physical characteristics
Mean diameter	6.909±0.198 km[6] 7.349±0.144 km[7][8]
Synodic rotation period	29.25 h[9]
Geometric albedo	0.1797[8] 0.203[6][7]
Spectral type	S (S3OS2)[10]
Absolute magnitude (H)	13.15[1][3][6][8][11]

Orbit and classification

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 in September 1942.^[1]

Naming

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 characteristics

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 period

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 albedo

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]

References

1. "1759 Kienle (1942 RF)". Minor Planet Center. Retrieved 10 December 2018.
2. 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. "JPL Small-Body Database Browser: 1759 Kienle (1942 RF)" (2018-06-15 last obs.). Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 10 December 2018.
4. "Asteroid 1759 Kienle". Small Bodies Data Ferret. Retrieved 10 December 2018.
5. "Asteroid (1759) Kienle – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 December 2018.
6. 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. 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. S2CID 118745497.
8. 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. S2CID 35447010. (catalog)
9. 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. 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. "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 links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1759 Kienle at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1759 Kienle at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters