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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.
| Discovery [1] | |
|---|---|
| Discovered by | L. Zhuravleva |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 14 July 1972 |
| Designations | |
| (2423) Ibarruri | |
Named after | Rubén Ibárruri (Hero of the Soviet Union)[2] |
| 1972 NC · 1930 SV 1943 TB · 1956 VC 1972 PB | |
| Mars-crosser [3][4] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 60.59 yr (22,129 days) |
| Aphelion | 2.8068 AU |
| Perihelion | 1.5702 AU |
| 2.1885 AU | |
| Eccentricity | 0.2825 |
| 3.24 yr (1,183 days) | |
| 315.42° | |
| Inclination | 4.0571° |
| 264.96° | |
| 80.645° | |
| Physical characteristics | |
| Dimensions | 4.899±1.085[5] 6.50 km (calculated)[3] |
| 73.08±0.10 h[6] 139.79±0.04 h[a] 139.9±0.2 h[7] 139.92±0.01 h[8] | |
| 0.20 (assumed)[3] 0.330±0.167[5] | |
| SMASS = A [1][9] L [10] · S [11] · C [3] | |
| 13.3[1] · 13.44±1.15[10] · 13.20[11] · 13.3[3] | |
The asteroid was discovered by Russian–Ukrainian astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnyj, on 14 July 1972.[4] It was named after Spanish communist Rubén Ruiz Ibárruri.[2]
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.[1]
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.[12]
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,[3] which is rather typical for stony asteroids.
Slow rotator and tumbler
Ibarruri has a notably slow rotation period of 140 hours,[a][7] and seems to be in a non-principal axis rotation (NPAR), colloquially called as "tumbling".[13]
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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.[2] The official naming citation was published by the Minor Planet Center on 8 February 1982 (M.P.C. 6649).[14]
- 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)
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