1203 Nanna

1203 Nanna, provisional designation 1931 TA, is a carbonaceous asteroid from the outer region of the asteroid belt, about 35 kilometers in diameter. It was discovered on 5 October 1931, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany,[13] and named after Anna Risi, a model and mistress of painter Anselm Feuerbach.[2]

1203 Nanna
Discovery[1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date5 October 1931
Designations
(1203) Nanna
Named after
Anna Risi
(model of painter)
Anselm Feuerbach[2]
1931 TA · 1926 RH
1978 AD
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc90.24 yr (32,960 days)
Aphelion3.6055 AU
Perihelion2.1795 AU
2.8925 AU
Eccentricity0.2465
4.92 yr (1,797 days)
137.21°
0° 12m 1.44s / day
Inclination5.9706°
224.58°
176.38°
Physical characteristics
Dimensions31.80±1.22 km[4]
32.59±0.87 km[5]
35.06 km (derived)[3]
35.18±3.9 km (IRAS:2)[6]
35.92±15.13 km[7]
37.91±12.03 km[8]
15.6±0.1 h (dated)[9]
18.54±0.01 h[10]
25.80±0.05 h[11]
0.028±0.017[7]
0.03±0.01[8]
0.03 (derived)[3]
0.04±0.00[4]
0.0473±0.012 (IRAS:2)[6]
0.056±0.004[5]
C[3]
11.20[5][6] · 11.60[8] · 11.63±0.24[12] · 11.7[1][3] · 11.71[4][7]

    Orbit

    Nanna is a dark C-type asteroid. It orbits the Sun at a distance of 2.2–3.6 AU once every 4 years and 11 months (1,797 days). Its orbit has an eccentricity of 0.25 and an inclination of 6° with respect to the ecliptic.[1] In 1926, it was first identified as 1926 RH, extending the body's observation arc by 5 years prior to its official discovery observation.[13]

    Rotation period

    In September 2009, two rotational lightcurves of Nanna were obtained by American astronomer Brian Warner from photometric observations at his Palmer Divided Observatory in Colorado. The first lightcurve analysis gave a rotation period of 18.54 hours with a brightness variation of 0.12 magnitude (U=2), while the second lightcurve was ambiguous giving a period of 25.80 and 12.90 hours, respectively, and an amplitude of 0.15 (U=2).[10] These results supersede a fragmentary lightcurve taken by French amateur astronomers Federico Manzini, Laurent Bernasconi and René Roy from August 2004, which gave a period of 15.6 hours (U=1).[9]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Nanna measures between 31.80 and 37.91 kilometers in diameter and its surface has an albedo of 0.028 and 0.056.[4][5][6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.03 and a diameter of 35.06 kilometers with an absolute magnitude of 11.7.[3]

    Naming

    This minor planet was named after Anna Risi, a model in several paintings by German classicist painter Anselm Feuerbach.[2] The official naming citation was published by Paul Herget in The Names of the Minor Planets in 1955 (H 112).[2]

    References
    1. "JPL Small-Body Database Browser: 1203 Nanna (1931 TA)" (2017-01-02 last obs.). Jet Propulsion Laboratory. Retrieved 13 February 2017.
    2. Schmadel, Lutz D. (2007). "(1203) Nanna". Dictionary of Minor Planet Names – (1203) Nanna. Springer Berlin Heidelberg. pp. 100–101. doi:10.1007/978-3-540-29925-7_1204. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1203) Nanna". Asteroid Lightcurve Database (LCDB). Retrieved 13 February 2017.
    4. 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 13 February 2017.
    5. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    6. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    7. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 13 February 2017.
    8. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 13 February 2017.
    9. Behrend, Raoul. "Asteroids and comets rotation curves – (1203) Nanna". Geneva Observatory. Retrieved 13 February 2017.
    10. Warner, Brian D. (April 2011). "Upon Further Review: VI. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin. 38 (2): 96–101. Bibcode:2011MPBu...38...96W. ISSN 1052-8091. Retrieved 13 February 2017.
    11. Warner, Brian D. (January 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 June-September". The Minor Planet Bulletin. 37 (1): 24–27. Bibcode:2010MPBu...37...24W. ISSN 1052-8091. Retrieved 13 February 2017.
    12. 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 13 February 2017.
    13. "1203 Nanna (1931 TA)". Minor Planet Center. Retrieved 13 February 2017.

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