| Discovery[1] | |
|---|---|
| Discovered by | J. Comas Solà |
| Discovery site | Fabra Obs. |
| Discovery date | 10 January 1927 |
| Designations | |
| (1626) Sadeya | |
Named after | Spanish and American Astronomical Society[2] |
| 1927 AA · 1956 AA | |
| main-belt · Phocaea[3][4] | |
| Orbital characteristics[5] | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.02yr (34,339 d) |
| Aphelion | 3.0090AU |
| Perihelion | 1.7185 AU |
| 2.3638 AU | |
| Eccentricity | 0.2730 |
| 3.63 yr (1,327 d) | |
| 335.85° | |
| 0° 16m 16.32s / day | |
| Inclination | 25.312° |
| 279.48° | |
| 149.29° | |
| Knownsatellites | 1[6](0.26Ds/Dp;P: 2.14 d) |
| Physical characteristics | |
| 14.25±2.36 km[7] 14.77±0.19 km[8] 15.140±0.490 km[9] 15.95 km(calculated)[3] | |
| 3.414±0.005h[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] | |
| 0.23(assumed)[3] 0.30±0.16[7] 0.486±0.067[9] 0.512±0.016[8] | |
| S[3] | |
| 10.50[8][9] · 11.10[7] · 11.2[5][3] | |
1626 Sadeya (provisional designation1927 AA) is a stony Phocaeaasteroid andbinary system from the inner regions of theasteroid belt, approximately 15 kilometers (9.3 miles) in diameter. It was discovered on 10 January 1927, by Catalan astronomerJosep Comas i Solà atFabra Observatory in Barcelona, Spain, and named after theSpanish and American Astronomical Society.[1][2] The discovery of acompanion was announced on 1 December 2020.[6]
The stonyS-type asteroid is a member of thePhocaea family (701),[4] a group of asteroids with rather highinclinations between 18° and 32°. It orbits the Sun in theinner 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 aneccentricity of 0.27 and aninclination of 25° with respect to theecliptic.[5] Sadeya'sobservation arc begins 2 months after its official discovery with aprecovery taken atYerkes Observatory.[1]
Thisminor planet was named after theSpanish 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 officialnaming citation was published by theMinor Planet Center on 30 January 1964 (M.P.C. 2277).[16]
Sadeya has a well-definedrotation period between 3.414 and 3.438 hours with a change in brightness between 0.07 and 0.22 inmagnitude (U=2+/3-/3). These numerous rotationallightcurves were obtained byESO 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]
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Sadeya measures between 14.25 and 15.14 kilometers in diameter, and its surface has analbedo between 0.30 and 0.512.[7][8][9] TheCollaborative Asteroid Lightcurve Link assumes a lower albedo of 0.23 – derived from25 Phocaea, the namesake of the Phocaea family – and calculates a diameter of 15.95 kilometers with anabsolute magnitude of 11.2.[3]
On 1 December 2020, the discovery of a satellite in orbit of Sadeya was announced by Vladimir Benishek,Petr Pravec, and several other collaborators. Theminor-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.[6]
