1626 Sadeya

1626 Sadeya, provisional designation 1927 AA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 15 kilometers in diameter.

1626 Sadeya
Discovery [1]
Discovered byJ. Comas Solà
Discovery siteFabra Obs.
Discovery date10 January 1927
Designations
(1626) Sadeya
Named after
Spanish and American Astronomical Society [2]
1927 AA · 1956 AA
main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc89.67 yr (32,752 days)
Aphelion3.0120 AU
Perihelion1.7161 AU
2.3640 AU
Eccentricity0.2741
3.63 yr (1,328 days)
11.175°
0° 16m 16.32s / day
Inclination25.287°
279.53°
148.79°
Physical characteristics
Dimensions14.25±2.36 km[5]
14.77±0.19 km[6]
15.140±0.490 km[7]
15.95 km (calculated)[3]
3.414±0.005 h[8]
3.418±0.001[9]
3.419±0.001 h[9]
3.420±0.001 h[10][11]
3.4200±0.0006 h[12]
3.42048±0.00005 h[11]
3.438±0.009 h[13]
0.23 (assumed)[3]
0.30±0.16[5]
0.486±0.067[7]
0.512±0.016[6]
S [3]
10.50[6][7] · 11.10[5] · 11.2[1][3]

    It was discovered on 10 January 1927, by Catalan astronomer Josep Comas i Solà at Fabra Observatory in Barcelona, Spain, and named after the Spanish and American Astronomical Society.[2][14]

    Orbit and classification

    The stony S-type asteroid is a member of the Phocaea family (701),[4] a group of asteroids with rather high inclinations between 18° and 32°. It orbits the Sun in the inner main-belt at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,328 days). Its orbit has an eccentricity of 0.27 and an inclination of 25° with respect to the ecliptic.[1] Sadeya's observation arc begins 2 months after its official discovery with a precovery taken at Yerkes Observatory.[14]

    Physical characteristics

    Rotation period

    Sadeya has a well-defined rotation period between 3.414 and 3.438 hours with a change in brightness between 0.07 and 0.22 in magnitude (U=2+/3-/3). These numerous rotational lightcurves were obtained by ESO astronomers, Julian Oey, Pierre Antonini, Ramon Naves, Enric Forné, Hilari Pallares, Brian Warner and Vladimir Benishek between 1996 and 2014.[9][10][11][12][13]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sadeya measures between 14.25 and 15.14 kilometers in diameter, and its surface has an albedo between 0.30 and 0.512.[5][6][7] The Collaborative Asteroid Lightcurve Link assumes a lower albedo of 0.23 – derived from 25 Phocaea, the namesake of the Phocaea family – and calculates a diameter of 15.95 kilometers with an absolute magnitude of 11.2.[3]

    Naming

    This minor planet was named after the Spanish and American Astronomical Society (Spanish: Sociedad Astrónomica de España y América), also known by its acronym "Sadeya". It was founded by Comas i Solà, who also was its first president.[2] The official naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277).[15]

    References
    1. "JPL Small-Body Database Browser: 1626 Sadeya (1927 AA)" (2016-11-04 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
    2. Schmadel, Lutz D. (2007). "(1626) Sadeya". Dictionary of Minor Planet Names – (1626) Sadeya. Springer Berlin Heidelberg. p. 129. doi:10.1007/978-3-540-29925-7_1627. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1626) Sadeya". Asteroid Lightcurve Database (LCDB). Retrieved 28 December 2016.
    4. "Asteroid 1626 Sadeya – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 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 28 December 2016.
    6. 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)
    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 28 December 2016.
    8. Warner, Brian D. (April 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 September-December". The Minor Planet Bulletin. 37 (2): 57–64. Bibcode:2010MPBu...37...57W. ISSN 1052-8091. Retrieved 28 December 2016.
    9. Benishek, Vladimir (January 2015). "Rotation Period Determinations for 1095 Tulipa, 1626 Sadeya 2132 Zhukov, and 7173 Sepkoski". The Minor Planet Bulletin. 42 (1): 75–76. Bibcode:2015MPBu...42...75B. ISSN 1052-8091. Retrieved 28 December 2016.
    10. Warner, Brian D. (July 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin. 41 (3): 144–155. Bibcode:2014MPBu...41..144W. ISSN 1052-8091. Retrieved 28 December 2016.
    11. Behrend, Raoul. "Asteroids and comets rotation curves – (1626) Sadeya". Geneva Observatory. Retrieved 28 December 2016.
    12. Oey, Julian; Krajewski, Ric (June 2008). "Lightcurve Analysis of Asteroids from Kingsgrove and Other Collaborating Observatories in the First Half of 2007". The Minor Planet Bulletin. 35 (2): 47–48. Bibcode:2008MPBu...35...47O. ISSN 1052-8091. Retrieved 28 December 2016.
    13. Florczak, M.; Dotto, E.; Barucci, M. A.; Birlan, M.; Erikson, A.; Fulchignoni, M.; et al. (November 1997). "Rotational properties of main belt asteroids: photoelectric and CCD observations of 15 objects". Planetary and Space Science. 45 (11): 1423–1435. Bibcode:1997P&SS...45.1423F. doi:10.1016/S0032-0633(97)00121-9. Retrieved 28 December 2016.
    14. "1626 Sadeya (1927 AA)". Minor Planet Center. Retrieved 28 December 2016.
    15. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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