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2423 Ibarruri, provisional designation 1972 NC, is an eccentric, tumbling and rare-type asteroid, classified as slow rotator and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 5 kilometers in diameter.

The asteroid was discovered by Russian–Ukrainian astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnyj, on 14 July 1972. It was named after Spanish communist Rubén Ruiz Ibárruri.

Orbit and classification

Ibarruri orbits the Sun in the inner main-belt at a distance of 1.6–2.8 AU once every 3 years and 3 months (1,183 days). Its orbit has an eccentricity of 0.28 and an inclination of 4° with respect to the ecliptic.

Physical characteristics

The spectral type of the asteroid is that of a rare A-type in the SMASS taxonomy, with its surface consisting of almost pure olivine, which gives the body a very reddish color. As of November 2015, only 17 minor planets of this type are known.

As a spectroscopic A-type asteroid, it belongs to the larger group of bodies with a silicaceous composition. However, the Collaborative Asteroid Lightcurve Link classifies the asteroid into the carbonaceous group, despite the fact that is assumes a relatively high geometric albedo of 0.20, which is rather typical for stony asteroids.

Slow rotator and tumbler

Ibarruri has a notably slow rotation period of 140 hours, and seems to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling".

Naming

This minor planet was named after Rubén Ruiz Ibárruri (1920–1942), son of Spanish communist leader Dolores Ibárruri and a posthumous Hero of the Soviet Union. He enlisted in the Soviet army and died in the early stage of the Battle of Stalingrad in September 1942. The official naming citation was published by the Minor Planet Center on 8 February 1982 (M.P.C. 6649).

Notes

1. ^ Pravec (2011) web: lightcurve plot for (2423) Ibarruri with a rotation period 139.79±0.04 hours with a brightness amplitude of 0.74 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)

References

1. ^ "JPL Small-Body Database Browser: 2423 Ibarruri (1972 NC)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(2423) Ibarruri". Dictionary of Minor Planet Names – (2423) Ibarruri. Springer Berlin Heidelberg. p. 198. doi:10.1007/978-3-540-29925-7_2424. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (2423) Ibarruri". Asteroid Lightcurve Database (LCDB). Retrieved 7 December 2016.
4. ^ "2423 Ibarruri (1972 NC)". Minor Planet Center. Retrieved 7 December 2016.
5. ^ Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 7 December 2016.
6. Vander Haagen, Gary A. (April 2012). "Lightcurves of 724 Hapag, 2423 Ibarruri, 4274 Karamanov 4339 Almamater, and 5425 Vojtech". The Minor Planet Bulletin. 39 (2): 48–50. Bibcode:2012MPBu...39...48V. ISSN 1052-8091. Retrieved 7 December 2016.
7. ^ Buchheim, Robert K. (October 2012). "Lightcurves of 2423 Ibarruri and 8345 Ulmerspatz". The Minor Planet Bulletin. 39 (4): 209–211. Bibcode:2012MPBu...39..209B. ISSN 1052-8091. Retrieved 7 December 2016.
8. Ferrero, Andrea (April 2012). "Lightcurve Determination at the Bigmuskie Observatory from 2011 July-December". The Minor Planet Bulletin. 39 (2): 65–67. Bibcode:2012MPBu...39...65F. ISSN 1052-8091. Retrieved 7 December 2016.
9. Xu, Shui; Binzel, Richard P.; Burbine, Thomas H.; Bus, Schelte J. (May 1995). "Small main-belt asteroid spectroscopic survey: Initial results". Icarus. 115 (1): 1–35. Bibcode:1995Icar..115....1X. doi:10.1006/icar.1995.1075. ISSN 0019-1035. Retrieved 25 November 2015.
10. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 7 December 2016.
11. ^ Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 7 December 2016.
12. "JPL Small-Body Database Search Engine: spec. type = A (SMASSII)". JPL Solar System Dynamics. Retrieved 25 November 2015.
13. Pravec, P.; Scheirich, P.; Durech, J.; Pollock, J.; Kusnirák, P.; Hornoch, K.; et al. (May 2014). "The tumbling spin state of (99942) Apophis". Icarus. 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Retrieved 25 November 2015.
14. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 December 2016.

External links

• Ondrejov Asteroid Photometry Project
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2423 Ibarruri at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2423 Ibarruri at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Mars-crossing asteroids
• Discoveries by Lyudmila Zhuravleva
• Named minor planets
• Slow rotating minor planets
• A-type asteroids (SMASS)
• Astronomical objects discovered in 1972