7 Iris
 | |
| Discovery | |
|---|---|
| Discovered bi | John Russell Hind |
| Discovery date | August 13, 1847 |
| Designations | |
| Pronunciation | /ˈaɪərᵻs/ YR-is |
Named after | Īris |
| none | |
| Main belt | |
| Adjectives | Iridian /aɪˈrɪdiən/[1] |
| Orbital chairactereestics | |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 2.937 AU (439.337 Gm) |
| Perihelion | 1.833 AU (274.259 Gm) |
| 2.385 AU (356.798 Gm) | |
| Eccentricity | 0.231 |
| 3.68 a (1345.375 d) | |
Average orbital speed | 19.03 km/s |
| 269.531° | |
| Inclination | 5.527° |
| 259.727° | |
| 145.440° | |
| Proper orbital elements[2] | |
Proper semi-major axis | 2.3862106 AU |
Proper eccentricity | 0.2125516 |
Proper inclination | 6.3924857° |
Proper mean motion | 97.653672 deg / yr |
Proper orbital period | 3.6865 yr (1346.493 d) |
Precession o perihelion | 38.403324 arcsec / yr |
Precession of the ascending node | −46.447128 arcsec / yr |
| Pheesical chairacteristics | |
| Dimensions | 240×200×200 km[3] 225×190×190 km[4] 199.8 ± 10 km (IRAS)[5] |
| Mass | 1.62 ± 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] | |
| Albedo | 0.277 (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" | |
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7 Iris is a lairge main-belt asteroid orbitin the Sun atween Mars an Jupiter.
References
[eedit | eedit soorce]- ↑ Oxford English Dictionary
- ↑ "AstDyS-2 Iris Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 1 October 2011.
- ↑ a b c Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Archived frae the original on 21 October 2013. Retrieved 14 September 2011.
- ↑ 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. Archived frae the original (PDF) on 16 Februar 2008. Retrieved 7 November 2014. Explicit use of et al. in:
|author2=(help) - ↑ "JPL Small-Body Database Browser: 7 Iris". 17 Mairch 2009. Retrieved 17 Mairch 2009.
last obs
- ↑ "Planetary Data System Small Bodies Node, lightcurve parameters". Archived frae the original on 14 Juin 2006. Retrieved 7 November 2014.
- ↑ Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. pp. 391. ISBN 0-395-34835-8.
- ↑ "Bright Minor Planets 2006". Minor Planet Center. Retrieved 21 Mey 2008.