2056 Nancy

2056 Nancy, provisional designation A909 TB, is a stony background asteroid from the inner regions of the asteroid belt, approximately 10 kilometers (6 miles) in diameter. It was discovered on 15 October 1909, by German astronomer Joseph Helffrich at Heidelberg Observatory in southwest Germany.[1] The S-type asteroid has a tentative rotation period of 15.0 hours.[4] It was named for Nancy Marsden, wife of British astronomer Brian G. Marsden.[2]

2056 Nancy
Discovery [1]
Discovered byJ. Helffrich
Discovery siteHeidelberg Obs.
Discovery date15 October 1909
Designations
(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 [1][3] · (inner) [4]
background [5]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc108.60 yr (39,665 d)
Aphelion2.5253 AU
Perihelion1.9098 AU
2.2175 AU
Eccentricity0.1388
3.30 yr (1,206 d)
303.73°
0° 17m 54.6s / day
Inclination3.9361°
225.77°
145.80°
Physical characteristics
Mean diameter
7.783±0.150 km[6]
8.227±0.085 km[7]
10.30 km (calculated)[4]
11.19±2.42 km[8]
15.0 h[lower-alpha 1]
0.16±0.08[8]
0.20 (assumed)[4]
0.3164±0.0387[7]
0.351±0.056[6]
SMASS = S [3][4]
12.3[1][3][4][7]
12.62[8]

    Orbit and classification

    Nancy is a non-family asteroid of the main belt's background population. It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,206 days; semi-major axis of 2.22 AU). Its orbit has an eccentricity of 0.14 and an inclination of 4° with respect to the ecliptic.[3] The asteroid's observation arc begins with its official discovery observation at Heidelberg in October 1909.[1]

    Naming

    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 official naming citation was published by the Minor Planet Center on 1 April 1978 (M.P.C. 4359).[9]

    Physical characteristics

    Nancy is a common S-type asteroid in the SMASS classification.[3]

    Lightcurves

    As of 2018, only a single fragmentary lightcurve of Nancy has been obtained from photometric observation. Analysis of the rotational lightcurve gives a period of 15 hours with a brightness variation of 0.08 magnitude (U=1).[4][lower-alpha 1]

    Diameter and albedo

    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.[6][7][8] 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.[4]

    Notes
    1. 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).

    References
    1. "2056 Nancy (A909 TB)". Minor Planet Center. Retrieved 8 September 2018.
    2. Schmadel, Lutz D. (2007). "(2056) Nancy". Dictionary of Minor Planet Names – (2056) Nancy. Springer Berlin Heidelberg. p. 166. doi:10.1007/978-3-540-29925-7_2057. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 2056 Nancy (A909 TB)" (2018-05-21 last obs.). Jet Propulsion Laboratory. Retrieved 8 September 2018.
    4. "LCDB Data for (2056) Nancy". Asteroid Lightcurve Database (LCDB). Retrieved 3 July 2017.
    5. "Asteroid 2056 Nancy". Small Bodies Data Ferret. Retrieved 8 September 2018.
    6. 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.
    7. 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.
    8. 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. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 3 July 2017.
    9. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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