Astronomy:1626 Sadeya

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1626 Sadeya
Discovery[1]
Discovered byJ. Comas Solà
Discovery siteFabra Obs.
Discovery date10 January 1927
Designations
(1626) Sadeya
Named afterSpanish and American Astronomical Society[2]
1927 AA · 1956 AA
Minor planet categorymain-belt · Phocaea[3][4]
Orbital characteristics[6]
Epoch 17 December 2020 (JD 2459200.5)
Uncertainty parameter 0
Observation arc94.02 yr (34,339 d)
|{{{apsis}}}|helion}}3.0090 AU
|{{{apsis}}}|helion}}1.7185 AU
2.3638 AU
Eccentricity0.2730
Orbital period3.63 yr (1,327 d)
Mean anomaly335.85°
Mean motion0° 16m 16.32s / day
Inclination25.312°
Longitude of ascending node279.48°
149.29°
Known satellites1[5] (0.26Ds/Dp; P: 2.14 d)
Physical characteristics
Mean diameter14.25±2.36 km[7]
14.77±0.19 km[8]
15.140±0.490 km[9]
15.95 km (calculated)[3]
Rotation period3.414±0.005 h[10]
3.418±0.001[11]
3.419±0.001 h[11]
3.420±0.001 h[12][13]
3.4200±0.0006 h[14]
3.42048±0.00005 h[13]
3.438±0.009 h[15]
Geometric albedo0.23 (assumed)[3]
0.30±0.16[7]
0.486±0.067[9]
0.512±0.016[8]
S[3]
Absolute magnitude (H)10.50[8][9] · 11.10[7] · 11.2[6][3]


1626 Sadeya, prov. designation: 1927 AA, is a stony Phocaea asteroid and binary system from the inner regions of the asteroid belt, approximately 15 kilometers (9.3 miles) in diameter. 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.[1][2] The discovery of a companion was announced on 1 December 2020.[5]

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 (1,327 days; semi-major axis of 2.36 AU). Its orbit has an eccentricity of 0.27 and an inclination of 25° with respect to the ecliptic.[6] Sadeya's observation arc begins 2 months after its official discovery with a precovery taken at Yerkes Observatory.[1]

Naming

This minor planet was named after the Spanish and American Astronomical Society, also known by its acronym "S.A.D.E.Y.A." (Spanish: Sociedad Astrónomica de España y América). 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).[16]

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 ({{{1}}}). 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.[11][12][13][14][15]

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.[7][8][9] 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]

Satellite

On 1 December 2020, the discovery of a satellite in orbit of Sadeya was announced by Vladimir Benishek, Petr Pravec, and several other collaborators. The minor-planet moon measures approximately 3.81 kilometers (2.4 miles) in diameter, or 26% that of its primary, and has an orbital period of about 51.3 hours.[5]

References

  1. ↑ 1.0 1.1 1.2 "1626 Sadeya (1927 AA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1626. Retrieved 26 June 2021. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1626) Sadeya". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 129. doi:10.1007/978-3-540-29925-7_1627. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (1626) Sadeya". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1626%7CSadeya. Retrieved 28 December 2016. 
  4. ↑ 4.0 4.1 "Asteroid 1626 Sadeya – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1626+Sadeya#Asteroid%201626%20SadeyaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 26 October 2019. 
  5. ↑ 5.0 5.1 5.2 Johnston, Wm. Robert (14 February 2021). "Asteroids with Satellites Database – (1626) Sadeya". Johnston's Archive. http://www.johnstonsarchive.net/astro/astmoons/am-01626.html. Retrieved 26 June 2021. 
  6. ↑ 6.0 6.1 6.2 "JPL Small-Body Database Browser: 1626 Sadeya (1927 AA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001626. Retrieved 26 June 2021. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N. Retrieved 28 December 2016. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 28 December 2016. 
  10. ↑ Warner, Brian D. (April 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 September-December". The Minor Planet Bulletin 37 (2): 57–64. ISSN 1052-8091. Bibcode: 2010MPBu...37...57W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...57W. Retrieved 28 December 2016. 
  11. ↑ 11.0 11.1 11.2 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. ISSN 1052-8091. Bibcode: 2015MPBu...42...75B. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...75B. Retrieved 28 December 2016. 
  12. ↑ 12.0 12.1 Warner, Brian D. (July 2014). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin 41 (3): 144–155. ISSN 1052-8091. Bibcode: 2014MPBu...41..144W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..144W. Retrieved 28 December 2016. 
  13. ↑ 13.0 13.1 13.2 Behrend, Raoul. "Asteroids and comets rotation curves – (1626) Sadeya". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001626. Retrieved 28 December 2016. 
  14. ↑ 14.0 14.1 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. ISSN 1052-8091. Bibcode: 2008MPBu...35...47O. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...47O. Retrieved 28 December 2016. 
  15. ↑ 15.0 15.1 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. doi:10.1016/S0032-0633(97)00121-9. Bibcode: 1997P&SS...45.1423F. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1997P&SS...45.1423F. Retrieved 28 December 2016. 
  16. ↑ 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. https://archive.org/details/dictionaryminorp2008schm. 

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