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1958 Chandra, provisional designation 1970 SB, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 35 kilometers in diameter.

1958 Chandra
Discovery [1]
Discovered byC. U. Cesco
Discovery siteEl Leoncito
(Yale–Columbia Station)
Discovery date24 September 1970
MPC designation(1958) Chandra
Named after
Subrahmanyan Chandrasekhar
1970 SB · 1947 HD
1959 RG1 · 1965 UN
1971 XA
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc62.66 yr (22,887 days)
Aphelion3.6220 AU
Perihelion2.5840 AU
3.1030 AU
5.47 yr (1,997 days)
0° 10m 49.08s / day
Physical characteristics
Dimensions33.82 km (derived)[3]
36.167±0.349 km[5]
7.0571±0.0029 h[6]
7.070±0.004 h[7]
0.0511 (derived)[3]
10.7[5] · 11.102±0.003 (R)[6] · 11.18±0.18[8] · 11.2[1][3]

It was discovered on 24 September 1970, by Argentinian astronomer Carlos Cesco at the Yale–Columbia Southern Station of the Leoncito Astronomical Complex in San Juan, Argentina (also see Félix Aguilar Observatory).[9] It was named after astrophysicist Subrahmanyan Chandrasekhar.[2]

Orbit and classificationEdit

Chandra is a dark C-type asteroid that orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (1,997 days). Its orbit has an eccentricity of 0.17 and an inclination of 11° with respect to the ecliptic.[1]

In April 1947, the asteroid was first identified as 1947 HD at Algiers Observatory. The body's observation arc begins 16 years prior to its official discovery observation with a precovery taken at Palomar Observatory in 1954.[9]

Physical characteristicsEdit


In December 2010, a rotational lightcurve was obtained for this asteroid from photometric observations at the U.S. Palomar Transient Factory, California. It gave a rotation period of 7.0571±0.0029 hours with a brightness variation of 0.35 magnitude (U=2).[6] A second lightcurve, obtained by Italian amateur astronomer Silvano Casulli in August 2014, gave a concurring period of 7.070±0.004 hours with an amplitude of 0.38 in magnitude (U=3-).[7]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 36.2 kilometers in diameter and its surface has an albedo of 0.07,[5] while the Collaborative Asteroid Lightcurve Link derives an albedo of 0.05 and a diameter of 33.8 kilometers with an absolute magnitude of 11.2.[3]


This minor planet was named in honor of Subrahmanyan Chandrasekhar (1910–1995), the Nobel Prize winning Indian–American theoretical astrophysicist (also see Chandrasekhar limit).[2] The approved naming citation was published by the Minor Planet Center on 1 November 1979 (M.P.C. 5013).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 1958 Chandra (1970 SB)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 2 July 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1958) Chandra". Dictionary of Minor Planet Names – (1958) Chandra. Springer Berlin Heidelberg. p. 157. doi:10.1007/978-3-540-29925-7_1959. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1958) Chandra". Asteroid Lightcurve Database (LCDB). Retrieved 25 August 2016.
  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. Retrieved 8 December 2016.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  6. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 25 August 2016.
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1958) Chandra". Geneva Observatory. Retrieved 25 August 2016.
  8. ^ 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 25 August 2016.
  9. ^ a b "1958 Chandra (1970 SB)". Minor Planet Center. Retrieved 25 August 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 August 2016.

External linksEdit