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2032 Ethel, provisional designation 1970 OH, is a dark background asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 30 July 1970, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[6] The asteroid was named after Irish writer Ethel Voynich.[2]

2032 Ethel
Discovery [1]
Discovered byT. Smirnova
Discovery siteCrimean Astrophysical Obs.
Discovery date30 July 1970
MPC designation(2032) Ethel
Named after
Ethel Voynich
(Irish writer)[2]
1970 OH · 1952 DU
1960 WM · 1965 UG1
1971 UD3
main-belt · (outer)
background [3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc65.18 yr (23,807 days)
Aphelion3.4615 AU
Perihelion2.6831 AU
3.0723 AU
5.39 yr (1,967 days)
0° 10m 58.8s / day
Physical characteristics
Dimensions36.007±0.105 km[4]

Orbit and classificationEdit

Ethel is a non-family asteroid of the main belt's background population.[3] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,967 days; semi-major axis 3.07 AU). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic.[1]

The body's observation arc begins with it identification as 1952 DU at Goethe Link Observatory in February 1952, more than 18 years prior to its official discovery observation Nauchnyj.[6]

Physical characteristicsEdit

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ethel measures 36.007 kilometers in diameter and its surface has an albedo of 0.034.[4][5]

Rotation periodEdit

As of 2017, no rotational lightcurve of Ethel has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[1][7]


This minor planet was named after Ethel Lilian Voynich (1864–1960), an Irish writer of the late Victorian epoch, best known for her novel The Gadfly. [2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4482).[8]


  1. ^ a b c d e "JPL Small-Body Database Browser: 2032 Ethel (1970 OH)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2032) Ethel". Dictionary of Minor Planet Names – (2032) Ethel. Springer Berlin Heidelberg. p. 165. doi:10.1007/978-3-540-29925-7_2033. ISBN 978-3-540-00238-3.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 5 December 2017.
  4. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  5. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 5 December 2017.
  6. ^ a b "2032 Ethel (1970 OH)". Minor Planet Center. Retrieved 5 December 2017.
  7. ^ "LCDB Data for (2032) Ethel". Asteroid Lightcurve Database (LCDB). Retrieved 5 December 2017.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 December 2017.

External linksEdit