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2423 Ibarruri

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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.

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2423 Ibarruri
Discovery [1]
Discovered byL. Zhuravleva
Discovery siteCrimean Astrophysical Obs.
Discovery date14 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 arc60.59 yr (22,129 days)
Aphelion2.8068 AU
Perihelion1.5702 AU
2.1885 AU
Eccentricity0.2825
3.24 yr (1,183 days)
315.42°
Inclination4.0571°
264.96°
80.645°
Physical characteristics
Dimensions4.899±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]
    Close

    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]

    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.[1]

    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.[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]

    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.[2] The official naming citation was published by the Minor Planet Center on 8 February 1982 (M.P.C. 6649).[14]

    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

    External links

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