865 Zubaida

865 Zubaida /zuːˈbaɪdə/ is an elongated, stony background asteroid from the inner regions of the asteroid belt. It was discovered on 15 February 1917, by astronomer Max Wolf at the Heidelberg Observatory in southwest Germany, and given the provisional designations A917 CH and 1917 BO.[1] The uncommon L-type asteroid has a rotation period of 11.4 hours and measures approximately 17 kilometers (11 miles) in diameter. It was named after Zobeide, a character in the opera Abu Hassan by Carl Maria von Weber (1786–1826).[2]

865 Zubaida
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date15 February 1917
Designations
(865) Zubaida
Pronunciation/zuːˈbaɪdə/
Named after
Zobeide, a character in the opera Abu Hassan
(Carl Maria von Weber)[2]
A917 CH · 1936 FK1
1970 GQ1 · A908 WF
1917 BO · 1908 WF
main-belt [1][3] · (inner)
background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc110.89 yr (40,502 d)
Aphelion2.8874 AU
Perihelion1.9487 AU
2.4181 AU
Eccentricity0.1941
3.76 yr (1,373 d)
191.81°
0° 15m 43.56s / day
Inclination13.344°
176.92°
302.04°
Physical characteristics
Mean diameter
  • 16.774±3.186 km[6]
  • 16.81±0.21 km[7]
  • 17.77±1.1 km[8]
11.3533±0.0061 h[9]
  • 0.0972±0.014[8]
  • 0.110±0.003[7]
  • 0.128±0.074[6]
11.7[1][3]

    Orbit and classification

    Zubaida is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 9 months (1,373 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.19 and an inclination of 13° with respect to the ecliptic.[3] The body's observation arc begins with its first observation as A908 WF at Heidelberg Observatory on 29 November 1908, more than 8 years prior to its official discovery observation.[1]

    Naming

    This minor planet was named after the character Zobeide, the Caliph's wife in the opera Abu Hassan by German composer Carl Maria von Weber (1786–1826). The official naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 85).[2] Another asteroid, 866 Fatme, was also named after one of the characters of this opera. The composer himself was honored with the naming of 4152 Weber.

    Physical characteristics

    In the SDSS-based taxonomy (MOC), Zubaida is an uncommon L-type asteroid,[10] while in the Masi Foglia Binzel (MFB) taxonomic variant, it is a common, stony S-type asteroid.[lower-alpha 1]

    Rotation period

    In January 2007, a rotational lightcurve of Zubaida was obtained from photometric observations by Colin Bembrick at the Mount Tarana Observatory (431) and Greg Crawford at Bagnall Beach Observatory (431) in collaboration with two other Australian observers. Lightcurve analysis gave a well-defined rotation period of 11.3533±0.0061 hours with a brightness variation of 0.38±0.02 magnitude (U=3). The observers also estimate an axial ratio (a/b) of 1.42 for the asteroid.[9] An alternative observation during January 2007, by David Higgins and Julian Oey at Hunters Hill (E14) and Leura (E17) observatories, respectively, gave a concurring period 11.363±0.004 hours with an amplitude of 0.38±0.03 magnitude (U=3–).[11]

    Diameter and albedo

    According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Zubaida measures (16.774±3.186), (16.81±0.21) and (17.77±1.1) kilometers in diameter and its surface has an albedo of (0.128±0.074), (0.110±0.003) and (0.0972±0.014), respectively.[6][7][8] The WISE team also published an alternative mean-diameter of (15.80±3.43 km) with a corresponding albedo of (0.16±0.09).[5][12] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 13.58 kilometers based on an absolute magnitude of 11.7.[12]

    Notes
    1. Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog (publication). SDSS-MFB (Masi Foglia Binzel) taxonomy (catalog).
    gollark: The calculator one *would* be good, if I could build in advanced features and beat Jared.
    gollark: Have some || 🐝.
    gollark: No, I mean do *you* have ideææææææææææææææææ?
    gollark: Ideæææææ?
    gollark: Are you actually on this "minecraft" game, also?

    References
    1. "865 Zubaida (A917 CH)". Minor Planet Center. Retrieved 5 March 2020.
    2. Schmadel, Lutz D. (2007). "(865) Zubaida". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 79. doi:10.1007/978-3-540-29925-7_866. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 865 Zubaida (A917 CH)" (2019-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 5 March 2020.
    4. "Asteroid 865 Zubaida – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 5 March 2020.
    5. "Asteroid 865 Zubaida". Small Bodies Data Ferret. Retrieved 5 March 2020.
    6. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M. Retrieved 5 March 2020.
    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 5 March 2020. (online, AcuA catalog p. 153)
    8. 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 5 March 2020.
    9. Bembrick, Collin; Crawford, Greg; Bolt, Greg; Allen, Bill (September 2007). "The Rotation Period of 865 Zubaida" (PDF). Minor Planet Bulletin. 34 (3): 84. Bibcode:2007MPBu...34...84B. ISSN 1052-8091.
    10. Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 5 March 2020. (PDS data set)
    11. Higgins, David; Oey, Julian (September 2007). "Asteroid Lightcurve Analysis at Hunters Hill Observatory and Collaborating Stations - December 2006 - April 2007" (PDF). Minor Planet Bulletin. 34 (3): 79–80. Bibcode:2007MPBu...34...79H. ISSN 1052-8091.
    12. "LCDB Data for (865) Zubaida". Asteroid Lightcurve Database (LCDB). Retrieved 5 March 2020.
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