14 Irene
From Wikipedia, the free encyclopedia
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Discovery
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| Discovered by | John Russell Hind |
| Discovery date | May 19, 1851 |
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Designations
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| Alternative names | A906 QC; A913 EA; 1952 TM |
| Minor planet category |
Main belt |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 451.858 Gm (3.020 AU) |
| Perihelion | 321.602 Gm (2.150 AU) |
| Semi-major axis | 386.730 Gm (2.585 AU) |
| Eccentricity | 0.168 |
| Orbital period | 1518.176 d (4.16 a) |
| Average orbital speed | 18.52 km/s |
| Mean anomaly | 326.489° |
| Inclination | 9.106° |
| Longitude of ascending node | 86.493° |
| Argument of perihelion | 96.473° |
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Physical characteristics
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| Dimensions | 181.8 km [1] |
| Mass | 6.3×1018 kg[citation needed] |
| Mean density | 2 ? g/cm³ |
| Equatorial surface gravity | 0.051 m/s² |
| Escape velocity | 0.096 km/s |
| Rotation period | 0.6275 d[2] |
| Albedo | 0.160[1] |
| Temperature | ~170 K |
| Spectral type | S-type asteroid [1] |
| Apparent magnitude | 8.84 to 12.25 |
| Absolute magnitude | 6.30 |
| Angular diameter | 0.17" to 0.052" |
14 Irene (pronounced /aɪˈriːni/, Greek: Ειρήνη) is a very large Main belt asteroid.
14 Irene was discovered by J. R. Hind on May 19, 1851, and named after Eirene, a personification of peace in Greek mythology. She was one of the Horae, daughter of Zeus and Themis. 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 [London] with 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 of Hyde Park, London 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",[3] but an actual drawing of the symbol was never made before the use of graphical symbols to represent asteroids was dropped entirely.[4]
The fairly flat Irenian lightcurves indicate somewhat spherical proportions. There have been four reported stellar occultation events by Irene.
[edit] References
- ^ a b c http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT
- ^ [1][dead link]
- ^ Hind, John Russell (1852). "From a Letter of Mr. Hind to the Editor". Astron. J. 2: 22-23.
- ^ When did the asteroids become minor planets?
- Gould, B.A., New planet, Astronomical Journal, Vol. 2, iss. 27, p. 22, June 1851
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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