7 Iris

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7 Iris
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer John Russell Hind
Discovery date August 13, 1847
Alternate
designations
  B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt
Orbital elements C (http://asteroid.lowell.edu/)
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.230
Semi-major axis (a) 357.019 Gm (2.387 AU)
Perihelion (q) 274.729 Gm (1.836 AU)
Aphelion (Q) 439.310 Gm (2.937 AU)
Orbital period (P) 1346.628 d (3.69 a)
Mean orbital speed 19.28 km/s
Inclination (i) 5.523
Longitude of the
ascending node
(Ω)
259.766
Argument of
perihelion
(ω)
145.406
Mean anomaly (M) 135.770
Physical characteristics
Dimensions 199.8 km
Mass 8.41018 kg
Density 2 ? g/cm
Surface gravity 0.0558 m/s
Escape velocity 0.1056 km/s
Rotation period 0.2975 d 1 (http://www.psi.edu/pds/archive/lc.html)
Spectral class S-type asteroid
Absolute magnitude 5.51
Albedo 0.277 2 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html)
Mean surface
temperature
~174 K

7 Iris (eye'-ris) is one of the largest Main belt asteroids. The Iridian surface is very bright-colored and is probably a mixture nickel-iron metals and magnesium- and iron-silicates.

It was the seventh asteroid discovered, on August 13, 1847 by J. R. Hind from London, UK. It was his first asteroid discovery.

It was named after the rainbow goddess Iris of Greek mythology, sister of the Harpies and messenger of the gods, especially Juno. Her quality of attendant of Juno was particularly appropriate to the circumstances of discovery, as she was spotted following 3 Juno by less than an hour of right ascension.

Iris was observed occulting a star on May 26, 1995 and later on July 25, 1997. Both observations give a diameter of about 200 km.

External links


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The minor planets
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud
(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
de:Iris (Asteroid)

es:(7) Iris fr:7 Iris it:Iris (astronomia) nn:7 Iris pl:Iris (astronomia) pt:7 Iris

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