1626 Sadeya

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Main-belt asteroid binary

title: "1626 Sadeya" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["phocaea-asteroids", "discoveries-by-josep-comas-solà", "named-minor-planets", "binary-asteroids", "astronomical-objects-discovered-in-1927"] description: "Main-belt asteroid binary" topic_path: "general/phocaea-asteroids" source: "https://en.wikipedia.org/wiki/1626_Sadeya" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Main-belt asteroid binary ::

::data[format=table title="Infobox planet"]

Field	Value
minorplanet	yes
name	1626 Sadeya
background	#D6D6D6
discovery_ref
discoverer	J. Comas Solà
discovery_site	Fabra Obs.
discovered	10 January 1927
mpc_name	(1626) Sadeya
alt_names	1927 AA1956 AA
named_after	Spanish and American Astronomical Society
mp_category	main-belt Phocaea
orbit_ref
epoch	17 December 2020 (JD 2459200.5)
uncertainty	0
observation_arc	94.02 yr (34,339 d)
aphelion	3.0090 AU
perihelion	1.7185 AU
semimajor	2.3638 AU
eccentricity	0.2730
period	3.63 yr (1,327 d)
mean_anomaly	335.85°
mean_motion	/ day
inclination	25.312°
asc_node	279.48°
arg_peri	149.29°
satellites	1 (0.26Ds/Dp; P: 2.14 d)
mean_diameter	km
km
km
15.95 km (calculated)
rotation	h

h h h h h | | albedo | 0.23 (assumed)

| | spectral_type | S | | abs_magnitude | 10.5011.1011.2 | ::

h h h h h | albedo = 0.23 (assumed)

| spectral_type = S | abs_magnitude = 10.5011.1011.2

1626 Sadeya (provisional designation ****) is a stony Phocaea asteroid and binary system from the inner regions of the asteroid belt, approximately 15 km 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. The discovery of a companion was announced on 1 December 2020.

Orbit and classification

The stony S-type asteroid is a member of the Phocaea family (701), 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. Sadeya's observation arc begins 2 months after its official discovery with a precovery taken at Yerkes Observatory.

Naming

This minor planet was named after the Spanish and American Astronomical Society, also known by its acronym "S.A.D.E.Y.A." (). It was founded by Comas i Solà, who also was its first president. The official was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277).

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 (). 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.

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. 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.

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 km in diameter, or 26% that of its primary, and has an orbital period of about 51.3 hours.

References

|type = 2021-03-10 last obs. |title = JPL Small-Body Database Browser: 1626 Sadeya (1927 AA) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001626 |publisher = Jet Propulsion Laboratory |accessdate = 26 June 2021}}

|title = Dictionary of Minor Planet Names |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |chapter = (1626) Sadeya |page = 129 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1627}}

|title = 1626 Sadeya (1927 AA) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1626 |accessdate = 26 June 2021}}

|title = Asteroids and comets rotation curves – (1626) Sadeya |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001626 |accessdate = 28 December 2016}}

|title = Asteroid 1626 Sadeya – Nesvorny HCM Asteroid Families V3.0 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1626+Sadeya#Asteroid%201626%20SadeyaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 |accessdate = 26 October 2019}}

|title = LCDB Data for (1626) Sadeya |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1626%7CSadeya |accessdate = 28 December 2016}}

|display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794 |access-date= 28 December 2016}}

|display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Masiero |first4 = J. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = T. |last6 = Grav |first7 = E. |last7 = Kramer |first8 = S. |last8 = Sonnett |first9 = R. |last9 = Stevenson |first10 = E. L. |last10 = Wright |date = December 2015 |title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N |journal = The Astrophysical Journal |volume = 814 |issue = 2 |page = 13 |bibcode = 2015ApJ...814..117N |doi = 10.1088/0004-637X/814/2/117 |arxiv = 1509.02522 |access-date= 28 December 2016}}

|display-authors = 6 |first1 = M. |last1 = Florczak |first2 = E. |last2 = Dotto |first3 = M. A. |last3 = Barucci |first4 = M. |last4 = Birlan |first5 = A. |last5 = Erikson |first6 = M. |last6 = Fulchignoni |first7 = A. |last7 = Nathues |first8 = L. |last8 = Perret |first9 = P. |last9 = Thebault |date = November 1997 |title = Rotational properties of main belt asteroids: photoelectric and CCD observations of 15 objects |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1997P&SS...45.1423F |journal = Planetary and Space Science |volume = 45 |issue = 11 |pages = 1423–1435 |bibcode = 1997P&SS...45.1423F |doi = 10.1016/S0032-0633(97)00121-9 |access-date= 28 December 2016}}

|first1 = Julian |last1 = Oey |first2 = Ric |last2 = Krajewski |date = June 2008 |title = Lightcurve Analysis of Asteroids from Kingsgrove and Other Collaborating Observatories in the First Half of 2007 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...47O |journal = The Minor Planet Bulletin |volume = 35 |issue = 2 |pages = 47–48 |issn = 1052-8091 |bibcode = 2008MPBu...35...47O |access-date= 28 December 2016}}

|author = Warner, Brian D. |date = April 2010 |title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 September-December |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...57W |journal = The Minor Planet Bulletin |volume = 37 |issue = 2 |pages = 57–64 |issn = 1052-8091 |bibcode = 2010MPBu...37...57W |access-date= 28 December 2016}}

|author = Warner, Brian D. |date = July 2014 |title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..144W |journal = The Minor Planet Bulletin |volume = 41 |issue = 3 |pages = 144–155 |issn = 1052-8091 |bibcode = 2014MPBu...41..144W |access-date= 28 December 2016}}

|author = Benishek, Vladimir |date = January 2015 |title = Rotation Period Determinations for 1095 Tulipa, 1626 Sadeya 2132 Zhukov, and 7173 Sepkoski |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...75B |journal = The Minor Planet Bulletin |volume = 42 |issue = 1 |pages = 75–76 |issn = 1052-8091 |bibcode = 2015MPBu...42...75B |access-date= 28 December 2016}}

|title = Asteroids with Satellites Database – (1626) Sadeya |work = Johnston's Archive |date = 14 February 2021 |last = Johnston |first= Wm. Robert |url = http://www.johnstonsarchive.net/astro/astmoons/am-01626.html |accessdate = 26 June 2021}}

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::