Main-belt Phocaea asteroid
25 Phocaea (/f oʊ ˈ s iː ə asteroid from the inner regions of theasteroid belt , approximately 75 kilometers in diameter. It is the parent body of thePhocaea family . Discovered byJean Chacornac in 1853, it was named after the ancient Greek city ofPhocaea .
Discovery and naming [ edit ] Phocaea was discovered on 6 April 1853, by French astronomerJean Chacornac atMarseille Observatory in southern France.[ 2] asteroid discovery out of a total of six.[citation needed The asteroid was named after the ancient Ionian Greek city ofPhocaea , modern-dayFoça in Turkey, where the founders ofMarseille came from.[ 4] Benjamin Valz .[ 4]
Classification and orbit [ edit ] Phocaea is theparent body and namesake of thePhocaea family (701 asteroid family of stony asteroids in theinner main belt.[ 6] [ 21] : 23
It orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,358 days). Its orbit has aneccentricity of 0.25 and aninclination of 22° with respect to theecliptic .[ 1] observation arc begins atVienna Observatory in March 1860, almost 7 years after its official discovery observation at Marseille.[ 2]
Physical characteristics [ edit ] Phocaea is a stonyS-type asteroid in both theTholen andSMASS classification ,[ 1] [ 19]
Photometric observations of this asteroid at the Organ Mesa Observatory inLas Cruces, New Mexico during 2010 gave alightcurve with a period of 9.9341 ± 0.0002 hours. The brightness near the deepest minimum of the light curve showed changes withphase angle , which is the result of shadows extending across surface irregularities.[ 15] [ 5]
Phocaea has also been studied byradar .[ 22]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS , the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer ,Phocaea measures between 61.05 and 83.21 kilometers in diameter and its surface has analbedo between 0.189 and 0.350.[ 8] [ 9] [ 10] [ 12] [ 13]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2310 and a diameter of 75.13 kilometers based on anabsolute magnitude of 7.83.[ 5]
The asteroid has a mass of (5.99 ± 0.60) × 1017 kilograms and a mean density of± 0.44[ 11]
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