61 Danaë

Danaë /ˈdæneɪ.iː/ (minor planet designation: 61 Danaë) is a stony (S-type) asteroid in the outer asteroid belt's background population, approximately 84 kilometer in diameter. It was discovered by French astronomer Hermann Goldschmidt on 9 September 1860, from his balcony in Paris, France.[17] Goldschmidt was ill when asked to name the asteroid, and requested his fellow asteroid-hunter Robert Luther to name it instead. Luther chose to name it after Danaë, the mother of Perseus in Greek mythology.[3] Danaë was the first asteroid to have a diacritical character in its official name.

61 Danaë
Discovery [1]
Discovered byH. Goldschmidt
Discovery siteParis
Discovery date9 September 1860
Designations
(61) Danaë
Pronunciation/ˈdæneɪ.iː/[2]
Named after
Danaë (Greek mythology)[3]
1953 RL1 · A917 SM
main-belt · (outer) [4]
background [5]
AdjectivesDanaëan /dæneɪˈiːən/[6]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc151.67 yr (55,398 days)
Aphelion3.4798 AU
Perihelion2.4840 AU
2.9819 AU
Eccentricity0.1670
5.15 yr (1,881 days)
157.11°
0° 11m 29.04s / day
Inclination18.212°
333.72°
12.695°
Physical characteristics
Dimensions82.04±4.3 km[7]
82.52±2.73 km[8]
83.56±1.02 km[9]
85.125±1.962 km[10]
85.937±2.151 km[11]
91.00±3.50 km[12]
Mass(2.89±2.78)×1018 kg[8]
Mean density
9.81±9.49 g/cm3[8]
11.45 h[13]
11.547±0.001 h[14]
0.181±0.034[12]
0.203±0.014[11]
0.2065±0.0472[10]
0.216±0.006[9]
0.2224±0.025[7]
Tholen = S [1]
SMASS = S [1][4]
B–V = 0.852 [1]
U–B = 0.402 [1]
7.56±0.10[15] · 7.68[1][4][7][9][10][12] · 7.78±0.25[16]

    The asteroid is orbiting the Sun with a period of 5.15 years and is rotating on its axis once every 11.45 hours. In 1985, a study of lightcurve data suggested that Danaë may have a moon. If so, the main body would be an ellipsoid measuring 85×80×75 km (52x49x46 mi), and the moon would orbit 101 kilometres (63 mi) away, measuring 55×30×30 km (34x18x18 mi). The density of both would be 1.1 g/cm³.

    References
    1. "JPL Small-Body Database Browser: 61 Danae" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
    2. "Danae". Lexico UK Dictionary. Oxford University Press.
    3. Schmadel, Lutz D. (2007). "(61) Danaë". Dictionary of Minor Planet Names – (61) Danaë. Springer Berlin Heidelberg. p. 21. doi:10.1007/978-3-540-29925-7_62. ISBN 978-3-540-00238-3.
    4. "LCDB Data for (61) Danaë". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
    5. "Asteroid 61 Danae". Small Bodies Data Ferret. Retrieved 24 October 2019.
    6. Charles Dickens (1852) Household Words, p. 207
    7. 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.
    8. Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science. 73 (1): 98–118. arXiv:1203.4336. Bibcode:2012P&SS...73...98C. doi:10.1016/j.pss.2012.03.009. See Table 1.
    9. 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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    10. 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.
    11. 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 2 November 2017.
    12. 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 2 November 2017.
    13. Wood, X. H. John; Kuiper, Gerard P. (May 1963). "Photometric Studies of Asteroids". Astrophysical Journal. 137: 1279. Bibcode:1963ApJ...137.1279W. doi:10.1086/147603. Retrieved 2 November 2017.
    14. Behrend, Raoul. "Asteroids and comets rotation curves – (61) Danaë". Geneva Observatory. Retrieved 2 November 2017.
    15. Warner, Brian D. (December 2007). "Initial Results of a Dedicated H-G Project". The Minor Planet Bulletin. 34 (4): 113–119. Bibcode:2007MPBu...34..113W. ISSN 1052-8091. Retrieved 2 November 2017.
    16. 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 2 November 2017.
    17. "61 Danae". Minor Planet Center. Retrieved 2 November 2017.

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