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25 Phocaea

Main-belt Phocaea asteroid

Field	Value
minorplanet	yes
name	25 Phocaea
background	#D6D6D6
image	25Phocaea (Lightcurve Inversion).png
caption	Lightcurve-base 3D-model of Phocaea
discovery_ref
discoverer	J. Chacornac
discovery_site	Marseille Obs.
discovered	6 April 1853
mpc_name	(25) Phocaea
alt_names	1956 GC
pronounced
adjective	Phocaean
named_after	Phōcæa
(ancient Greek city)
mp_category	main-belt(inner)
Phocaea
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	157.44 yr (57,504 days)
aphelion	3.0104 AU
perihelion	1.7899 AU
semimajor	2.4001 AU
eccentricity	0.2543
period	3.72 yr (1,358 days)
mean_anomaly	13.891°
mean_motion	/ day
inclination	21.606°
asc_node	214.14°
arg_peri	90.245°
dimensions	km
km
mass	(5.99 ± 0.60) × 1017 kg
density	g/cm3
rotation	h
albedo

spectral_type	Tholen S
SMASS SS
B–V 0.932
U–B 0.513
abs_magnitude	7.83

(ancient Greek city) Phocaea km

SMASS SS B–V 0.932 U–B 0.513

25 Phocaea () is a stony asteroid from the inner regions of the asteroid belt, approximately 75 kilometers in diameter. It is the parent body of the Phocaea family. Discovered by Jean Chacornac in 1853, it was named after the ancient Greek city of Phocaea.

Discovery and naming

Phocaea was discovered on 6 April 1853, by French astronomer Jean Chacornac at Marseille Observatory in southern France. It was his first asteroid discovery out of a total of six. The asteroid was named after the ancient Ionian Greek city of Phocaea, modern-day Foça in Turkey, where the founders of Marseille came from. The naming was proposed by French astronomer Benjamin Valz.

Classification and orbit

Phocaea is the parent body and namesake of the Phocaea family (701), a large asteroid family of stony asteroids in the inner main belt.

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 an eccentricity of 0.25 and an inclination of 22° with respect to the ecliptic. The body's observation arc begins at Vienna Observatory in March 1860, almost 7 years after its official discovery observation at Marseille.

Physical characteristics

Phocaea is a stony S-type asteroid in both the Tholen and SMASS classification, and has also been characterized as such by others.

Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a lightcurve with a period of 9.9341 ± 0.0002 hours. The brightness near the deepest minimum of the light curve showed changes with phase angle, which is the result of shadows extending across surface irregularities. Several other lightcurves have also been obtained.

Phocaea has also been studied by radar.

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Phocaea measures between 61.05 and 83.21 kilometers in diameter and its surface has an albedo between 0.189 and 0.350.

The Collaborative 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 an absolute magnitude of 7.83.

The asteroid has a mass of (5.99 ± 0.60) × 1017 kilograms and a mean density of grams per cubic centimeters, which lies approximately in between the density of limestone and concrete/gravel.

References

Noah Webster (1884) ''A Practical Dictionary of the English Language''
{{OED. Phocæan

Info: 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.

phocaea-asteroids discoveries-by-jean-chacornac named-minor-planets s-type-asteroids-(tholen) s-type-asteroids-(smass) astronomical-objects-discovered-in-1853

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