2056 Nancy

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2056 Nancy
Discovery [1]
Discovered by J. Helffrich
Discovery site Heidelberg Obs.
Discovery date 15 October 1909
MPC designation (2056) Nancy
Named after
Nancy Lou Zissell Marsden
(wife of Brian G. Marsden)[2]
A909 TB · 1929 VQ
1942 RA1 · 1962 XE
1972 VC1 · 1974 HL2
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 107.55 yr (39,281 days)
Aphelion 2.5256 AU
Perihelion 1.9103 AU
2.2180 AU
Eccentricity 0.1387
3.30 yr (1,207 days)
0° 17m 54.24s / day
Inclination 3.9359°
Physical characteristics
Dimensions 7.783±0.150 km[4]
8.227±0.085 km[5]
10.30 km (calculated)[3]
11.19±2.42 km[6]
15.0 h[a]
0.20 (assumed)[3]
SMASS = S[1] · S[3]
12.3[1][3][5] · 12.39±0.32[7] · 12.62[6]

2056 Nancy, provisional designation A909 TB, is a stony asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 15 October 1909, by German astronomer Joseph Helffrich at Heidelberg Observatory in southwest Germany.[8] It was named for Nancy Marsden, wife of British astronomer Brian G. Marsden.[2]

Orbit and classification[edit]

Nancy orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,207 days). Its orbit has an eccentricity of 0.14 and an inclination of 4° with respect to the ecliptic.[1] The asteroid's observation arc begins with its official discovery observation at Heidelberg in October 1909.[8]

Physical characteristics[edit]

Nancy is a common S-type asteroid in the SMASS classification.[1]


As of 2017, only a single fragmentary lightcurve of Nancy has been obtained. Analysis of the rotational lightcurve gives a period of 15 hours with a brightness variation of 0.08 magnitude (U=1).[a]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Nancy measures between 7.783 and 11.19 kilometers in diameter and its surface has an albedo between 0.16 and 0.351.[4][5][6]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.30 kilometers based on an absolute magnitude of 12.3.[3]


This minor planet was named after Nancy Lou Zissell Marsden, wife of British astronomer Brian G. Marsden, who established the asteroid's identification, and after whom another minor planet, 1877 Marsden, was previously named.[2] The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4359).[9]


  1. ^ a b Anonymous lightcurve: rotation period 15.0 hours with a brightness amplitude of 0.08 mag. Summary figures for (2056) Nancy at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2056 Nancy (A909 TB)" (2017-05-02 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2056) Nancy. Springer Berlin Heidelberg. p. 166. ISBN 978-3-540-00238-3. Retrieved 3 July 2017. 
  3. ^ a b c d e f "LCDB Data for (2056) Nancy". Asteroid Lightcurve Database (LCDB). Retrieved 3 July 2017. 
  4. ^ a b c 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. Bibcode:2014ApJ...791..121M. arXiv:1406.6645Freely accessible. doi:10.1088/0004-637X/791/2/121. Retrieved 3 July 2017. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. Bibcode:2011ApJ...741...90M. arXiv:1109.6407Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 3 July 2017. 
  6. ^ 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. Bibcode:2016AJ....152...63N. arXiv:1606.08923Freely accessible. doi:10.3847/0004-6256/152/3/63. Retrieved 3 July 2017. 
  7. ^ 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 3 July 2017. 
  8. ^ a b "2056 Nancy (A909 TB)". Minor Planet Center. Retrieved 3 July 2017. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 July 2017. 

External links[edit]