Irene ( minor planet designation: 14 Irene) is a large

main-belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid, discovered by the English astronomer John Russell Hind on May 19, 1851. It is orbiting the

Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...

at a distance of with a

period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (or rhetorical period), a concept ...

of and an

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

of 0.168. The

orbital plane The orbital plane of a revolving body is the geometric plane in which its orbit lies. Three non-collinear points in space suffice to determine an orbital plane. A common example would be the positions of the centers of a massive body (host) an ...

is tilted at an angle of 9.1° to the

plane of the ecliptic The ecliptic or ecliptic plane is the orbital plane of the Earth around the Sun. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic agains ...

. 14 Irene was named after '' Irēnē'', a personification of

peace Peace is a concept of societal friendship and harmony in the absence of hostility and violence. In a social sense, peace is commonly used to mean a lack of conflict (such as war) and freedom from fear of violence between individuals or groups. ...

Greek mythology A major branch of classical mythology, Greek mythology is the body of myths originally told by the ancient Greeks, and a genre of Ancient Greek folklore. These stories concern the origin and nature of the world, the lives and activities ...

. She was one of the

Horae In Greek mythology the Horae () or Horai () or Hours ( grc-gre, Ὧραι, Hōrai, , "Seasons") were the goddesses of the seasons and the natural portions of time. Etymology The term ''horae'' comes from the Proto-Indo-European ("year"). F ...

, daughter of

Zeus Zeus or , , ; grc, Δῐός, ''Diós'', label= genitive Boeotian Aeolic and Laconian grc-dor, Δεύς, Deús ; grc, Δέος, ''Déos'', label= genitive el, Δίας, ''Días'' () is the sky and thunder god in ancient Greek reli ...

and

Themis In Greek mythology and religion, Themis (; grc, Θέμις, Themis, justice, law, custom) is one of the twelve Titan children of Gaia and Uranus, and the second wife of Zeus. She is the goddess and personification of justice, divine order, fai ...

. The name was suggested by Sir John Herschel. Hind wrote, :"You will readily discover that this name ..has some relation to this event (the Great Industrial Exhibition) which is now filling our metropolis ondonwith the talent of all civilised nations, with those of Peace, the productions of Art and Science, in which all mankind must feel an interest." The ''Great Exhibition of the Works of Industry of All Nations'' in

the Crystal Palace The Crystal Palace was a cast iron and plate glass structure, originally built in Hyde Park, London, to house the Great Exhibition of 1851. The exhibition took place from 1 May to 15 October 1851, and more than 14,000 exhibitors from around th ...

of Hyde Park,

London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...

, ran from May 1 until October 18, 1851. Hind suggested that the symbol for the asteroid should be "A dove carrying an olive-branch, with a star on its head", but an actual drawing of the symbol was never made before the use of graphical symbols to represent asteroids was dropped entirely. Observations from 2007 indicate that the rotation pole of 14 Irene lies close to the

, indicating it has an

obliquity In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, which is the line perpendicular to its orbital plane; equivalently, it is the angle between its equatorial plane and orbi ...

close to 90°. The fairly flat Irenian

lightcurve In astronomy, a light curve is a graph of light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y axis and with time on the x axis. The light is usually in a particular freq ...

s indicate somewhat spherical proportions. This is a stony

S-type asteroid S-type asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition, hence the name. They have relatively high density. Approximately 17% of asteroids are of this type, making it the secon ...

with a mean diameter of around 152 km. It is spinning with a rotation period of 15 hours. There have been seven reported stellar

occultation An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks ...

events by Irene. The best is a three chord event observed in 2013.

Notes

References

* Gould, B.A.,
New planet
', Astronomical Journal, Vol. 2, iss. 27, p. 22, June 1851

External links

* (displays Elong from Sun and V mag for 2011) * * {{DEFAULTSORT:000014 Background asteroids Irene Irene S-type asteroids (Tholen) S-type asteroids (SMASS) 18510519

See also

Notes

References

External links