861 Aïda

861 Aïda /ɑːˈiːdə/ is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 65 kilometers in diameter. It was discovered on 22 January 1917, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany, and given the provisional designation 1917 BE. It was named after the Italian opera Aida.[10]

861 Aïda
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date22 January 1917
Designations
(861) Aïda
Pronunciation/ɑːˈiːdə/
Named after
Aida (Italian opera)[2]
1917 BE · 1939 BL
1947 OF · 1950 BW1
A906 BG · A918 GA
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc110.96 yr (40,527 days)
Aphelion3.4604 AU
Perihelion2.8158 AU
3.1381 AU
Eccentricity0.1027
5.56 yr (2,030 days)
160.30°
0° 10m 38.28s / day
Inclination8.0502°
115.03°
193.73°
Physical characteristics
Dimensions62.24±17.34 km[4]
62.52±21.29 km[5]
66.78 km (derived)[3]
66.85±3.7 km (IRAS:39)[6]
69.61±1.13 km[7]
10.95±0.03 h[8]
0.0522 (derived)[3]
0.053±0.002[7]
0.0571±0.007 (IRAS:39)[6]
0.06±0.04[4]
0.07±0.07[5]
C [3]
9.6[4][6][7] · 9.60±0.23[9] · 9.64[5] · 9.7[1][3]

    Orbit and classification

    Aïda is a dark C-type asteroid that orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,030 days). Its orbit has an eccentricity of 0.10 and an inclination of 8° with respect to the ecliptic.[1] Aïda was first identified as A906 BG at Heidelberg in 1906, extending the body's observation arc by 11 years prior to its official discovery observation.[10]

    Physical characteristics

    In May 2002, a rotational lightcurve of Aïda was obtained from photometric observations by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave a well-defined rotation period of 10.95 hours with a brightness variation of 0.32 magnitude (U=3).[8]

    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, Aïda measures between 62.24 and 66.85 kilometers in diameter, and its surface has an albedo between 0.0571 and 0.7.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0522 and a diameter of 66.78 kilometers with an absolute magnitude of 9.7.[3]

    Naming

    This minor planet was named for Aida, the famous Italian opera in four acts by composer Giuseppe Verdi (1813–1901), after whom the asteroid 3975 Verdi was named. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 84).[2]

    References
    1. "JPL Small-Body Database Browser: 861 Aida (1917 BE)" (2017-01-08 last obs.). Jet Propulsion Laboratory. Retrieved 14 March 2017.
    2. Schmadel, Lutz D. (2007). "(861) Aïda". Dictionary of Minor Planet Names – (861) Aïda. Springer Berlin Heidelberg. p. 78. doi:10.1007/978-3-540-29925-7_862. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (861) Aïda". Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2017.
    4. 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 14 March 2017.
    5. 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 14 March 2017.
    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. 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)
    8. Behrend, Raoul. "Asteroids and comets rotation curves – (861) Aïda". Geneva Observatory. Retrieved 14 March 2017.
    9. 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 14 March 2017.
    10. "861 Aida (1917 BE)". Minor Planet Center. Retrieved 14 March 2017.

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