61 Danaë

61 Danaë
Discovery [1]
Discovered by H. Goldschmidt
Discovery site Paris
Discovery date 9 September 1860
Designations
MPC designation (61) Danaë
Pronunciation /ˈdænəjiː/ DAN-ə-yee
Named after
 Danaë (Greek mythology)[2]
1953 RL1 · A917 SM
main-belt · (outer) [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 151.67 yr (55,398 days)
Aphelion 3.4798 AU
Perihelion 2.4840 AU
2.9819 AU
Eccentricity 0.1670
5.15 yr (1,881 days)
157.11°
0° 11m 29.04s / day
Inclination 18.212°
333.72°
12.695°
Physical characteristics
Dimensions 82.04±4.3 km[5]
82.52±2.73 km[6]
83.56±1.02 km[7]
85.125±1.962 km[8]
85.937±2.151 km[9]
91.00±3.50 km[10]
Mass (2.89±2.78)×1018 kg[6]
Mean density
 9.81±9.49 g/cm3[6]
11.45 h[11]
11.547±0.001 h[12]
0.181±0.034[10]
0.203±0.014[9]
0.2065±0.0472[8]
0.216±0.006[7]
0.2224±0.025[5]
Tholen = S [1]
SMASS = S [1][3]
B–V = 0.852 [1]
U–B = 0.402 [1]
7.56±0.10[13] · 7.68[1][3][5][7][8][10] · 7.78±0.25[14]

    61 Danaë (/ˈdænəjiː/ DAN-ə-yee or /dəˈneɪ.ə/ də-NAY-ə) is a stony asteroid of 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.[15]

    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.[2] Danaë was the first asteroid to have a diacritical character in its official name.

    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. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 61 Danae" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 2 November 2017.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (61) Danaë. Springer Berlin Heidelberg. p. 21. ISBN 978-3-540-00238-3. Retrieved 2 November 2017.
    3. 1 2 3 "LCDB Data for (61) Danaë". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
    4. ↑ "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 2 November 2017.
    5. 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Archived from the original on 3 June 2016. Retrieved 2 November 2017.
    6. 1 2 3 Carry, B. (December 2012). "Density of asteroids" (PDF). Planetary and Space Science. 73 (1): 98–118. arXiv:1203.4336. Bibcode:2012P&SS...73...98C. doi:10.1016/j.pss.2012.03.009. Retrieved 2 November 2017. See Table 1.
    7. 1 2 3 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 2 November 2017.
    8. 1 2 3 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 2 November 2017.
    9. 1 2 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.
    10. 1 2 3 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.
    11. ↑ Wood, X. H. John; Kuiper, Gerard P. (May 1963). "Photometric Studies of Asteroids". Astrophysical Journal: 1279. Bibcode:1963ApJ...137.1279W. doi:10.1086/147603. Retrieved 2 November 2017.
    12. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (61) Danaë". Geneva Observatory. Retrieved 2 November 2017.
    13. ↑ 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.
    14. ↑ 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.
    15. ↑ "61 Danae". Minor Planet Center. Retrieved 2 November 2017.

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