7 Iris

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7 Iris 7 Iris Astronomical Symbol.svg
7Iris-LB1-richfield-mag10.jpg
Star rich field shawin asteroid Iris (apmag 10.1)
Discovery
Discovered biJohn Russell Hind
Discovery dateAugust 13, 1847
Designations
Pronunciation/ˈaɪərs/ YR-is
Named after
Īris
none
Main belt
AdjectivesIridian /ˈrɪdiən/[1]
Orbital chairactereestics
Epoch November 26, 2005 (JD 2453700.5)
Aphelion2.937 AU (439.337 Gm)
Perihelion1.833 AU (274.259 Gm)
2.385 AU (356.798 Gm)
Eccentricity0.231
3.68 a (1345.375 d)
19.03 km/s
269.531°
Inclination5.527°
259.727°
145.440°
Proper orbital elements[2]
2.3862106 AU
0.2125516
6.3924857°
97.653672 deg / yr
3.6865 yr
(1346.493 d)
Precession o perihelion
38.403324 arcsec / yr
Precession of the ascending node
−46.447128 arcsec / yr
Pheesical chairacteristics
Dimensions240×200×200 km[3]
225×190×190 km[4]
199.8 ± 10 km (IRAS)[5]
Mass1.62 ± 0.09 ×1019 kg[3]
Mean density
3.21 ± 0.49 g/cm³[3]
0.109 m/s²
0.147 km/s
0.2975 d[6]
Albedo0.277 (geometric)
Temperatur~171 K
max: 275 K (+2°C)
Spectral teep
S-type asteroid
6.7[7][8] to 11.4
5.51
0.32" to 0.07"

7 Iris is a lairge main-belt asteroid orbitin the Sun atween Mars an Jupiter.

References[eedit | eedit soorce]

  1. Oxford English Dictionary
  2. "AstDyS-2 Iris Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 2011-10-01. 
  3. 3.0 3.1 3.2 Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2011-09-14. 
  4. Kaasalainen, M.; et al. (2002). "Models of twenty asteroids from photometric data" (PDF). Icarus. 159 (2): 369. Bibcode:2002Icar..159..369K. doi:10.1006/icar.2002.6907. 
  5. "JPL Small-Body Database Browser: 7 Iris". 2009-03-17. Retrieved 2009-03-17. last obs 
  6. "Planetary Data System Small Bodies Node, lightcurve parameters". 
  7. Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. p. 391. ISBN 0-395-34835-8. 
  8. "Bright Minor Planets 2006". Minor Planet Center. Retrieved 2008-05-21.