1126 Otero
A lightcurve-based 3D-model of Otero
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date11 January 1929
(1126) Otero
Named after
Carolina Otero
(Spanish courtesan)[2]
1929 AC · 1926 GD
1948 RN1 · 1949 YO
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc90.71 yr (33,133 days)
Aphelion2.6052 AU
Perihelion1.9394 AU
2.2723 AU
3.43 yr (1,251 days)
0° 17m 15.72s / day
Physical characteristics
Dimensions8.87±1.56 km[4]
10.974±0.892 km[5]
11.74 km (derived)[3]
3.648±0.002 h[6]
3.64808±0.00014 h[a]
0.1994 (derived)[3]
SMASS = A[1] · A[3]
11.41[5] · 11.57±0.05 (R)[a] · 11.9[1] · 12.098±0.071[3][7] · 12.10[4]

1126 Otero, provisional designation 1929 AC, is a rare-type Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 11 January 1929, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.[8] It was named after Spanish courtesan Carolina Otero.[2]

Classification and orbit

Otero is a member of the Flora family, one of the largest families of stony asteroids in the main belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,251 days). Its orbit has an eccentricity of 0.15 and an inclination of 7° with respect to the ecliptic.[1] It was first identified as 1926 GD at Uccle/Heidelberg in 1926, extending the asteroid's observation arc by 3 years prior to its official discovery at Heidelberg.[8]

Physical parameters

In the SMASS classification, Otero is a rare A-type asteroid.[1]


Two rotational lightcurve of Otero were obtained from photometric observations by astronomers Petr Pravec and Robert Stepens in February 2008. Lightcurve analysis gave a concurring, well-defined rotation period of 3.648 hours with a brightness variation of 0.69 and 0.70 magnitude, respectively (U=3/3).[6][a]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Otero measures 8.87 and 10.974 kilometers in diameter and its surface has an albedo of 0.37 and 0.399, respectively.[4][5] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1994 and a diameter of 11.74 kilometers with an absolute magnitude of 12.098 from Petr Pravec's revised WISE-data.[3][7]


This minor planet was named by the discoverer for Galician-born Spanish courtesan, dancer and actress Carolina Otero (1868–1965), who was also known as "La Belle Otero". During the Belle Époque, she was the most sought after woman in all of Europe and led an excessive life thanks to her numerous rich and famous lovers. The official naming citation was first published by the Astronomical Calculation Institute (RI 803).[2]


  1. ^ a b c Pravec (2008) web: lightcurve plot of (1126) Otero by Petr Pravec of the Ondrejov Asteroid Photometry Project, with rotation period 3.64808±0.00014 hours and a brightness amplitude of 0.69 mag. Summary figures at Collaborative Asteroid Lightcurve Link and Pravec, P.; Wolf, M.; Sarounova, L. (2008)


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1126 Otero (1929 AC)" (2016-12-21 last obs.). Jet Propulsion Laboratory. Retrieved 26 July 2017. CS1 maint: discouraged parameter (link)
  2. ^ a b c Schmadel, Lutz D. (2007). "(1126) Otero". Dictionary of Minor Planet Names – (1126) Otero. Springer Berlin Heidelberg. pp. 95–96. doi:10.1007/978-3-540-29925-7_1127. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1126) Otero". Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2017. CS1 maint: discouraged parameter (link)
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 14 March 2017.
  5. ^ a b c d 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 14 March 2017.
  6. ^ a b Stephens, Robert D. (September 2008). "Asteroids Observed from GMARS and Santana Observatories - Late 2007 and Early 2008". The Minor Planet Bulletin. 35 (3): 126–128. Bibcode:2008MPBu...35..126S. ISSN 1052-8091. Retrieved 14 March 2017.
  7. ^ a b Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 14 March 2017.
  8. ^ a b "1126 Otero (1929 AC)". Minor Planet Center. Retrieved 14 March 2017. CS1 maint: discouraged parameter (link)