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7 Iris is a large main-belt asteroid and possible remnant planetesimal orbiting the Sun between Mars and Jupiter. It is the fourth-brightest object in the asteroid belt. 7 Iris is classified as an S-type asteroid, meaning that it has a stony composition.
Characters, Characteristics & Discovery and name
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iris asteroid discovery km mean large diameter yr surface sun discovered belt magnitude asteroids s-type period rainbow oppositions features arcsec
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 7 Iris | Absolute magnitude (H) | 5.64 | 1.00 | infobox |
| 7 Iris | Adjectives | Iridian /ɪˈrɪdiən, aɪ-/ | 1.00 | infobox |
| 7 Iris | Alternative designations | 1847 PA | 1.00 | infobox |
| 7 Iris | Angular diameter | 0.32" to 0.07" | 1.00 | infobox |
| 7 Iris | Aphelion | 2.935 AU (439.1 million km) | 1.00 | infobox |
| 7 Iris | Apparent magnitude | 6.7 to 11.4 | 1.00 | infobox |
| 7 Iris | Argument of perihelion | 145.4° | 1.00 | infobox |
| 7 Iris | Average orbital speed | 19.03 km/s | 1.00 | infobox |
| 7 Iris | Dimensions | 268 km × 234 km × 180 km ± (5 km × 4 km × 6 km) 225 km × 190 km × 190 km | 1.00 | infobox |
| 7 Iris | Discovered by | John Russell Hind | 1.00 | infobox |
| 7 Iris | Discovery date | 13 August 1847 | 1.00 | infobox |
| 7 Iris | Earth MOID | 0.85 AU (127 million km) | 1.00 | infobox |
| 7 Iris | Eccentricity | 0.22977 | 1.00 | infobox |
| 7 Iris | Equatorial escape velocity | 0.131 km/s | 1.00 | infobox |
| 7 Iris | Equatorial rotation velocity | 25.4 m/s[b] | 1.00 | infobox |
| 7 Iris | Equatorial surface gravity | 0.08 m/s² | 1.00 | infobox |
| 7 Iris | Flattening | 0.42[a] | 1.00 | infobox |
| 7 Iris | Geometric albedo | 0.279 0.2766±0.030 | 1.00 | infobox |
| 7 Iris | Inclination | 5.519° | 1.00 | infobox |
| 7 Iris | Longitude of ascending node | 259.5° | 1.00 | infobox |
| 7 Iris | Mass | (13.5±2.3)×1018 kg(13.75±1.3)×1018 kg | 1.00 | infobox |
| 7 Iris | Mean anomaly | 207.9° | 1.00 | infobox |
| 7 Iris | Mean density | 3.26±0.74 g/cm3 2.7±0.3 g/cm3 | 1.00 | infobox |
| 7 Iris | Mean diameter | 199±10 km 214±5 km 199.83±10 km (IRAS) | 1.00 | infobox |
| 7 Iris | Minor planet category | Main belt | 1.00 | infobox |
| 7 Iris | Named after | Īris | 1.00 | infobox |
| 7 Iris | Orbital period (sidereal) | 3.69 a (1346.8 d) | 1.00 | infobox |
| 7 Iris | Perihelion | 1.838 AU (275.0 million km) | 1.00 | infobox |
| 7 Iris | Precession of asc. node | −46.447128 arcsec / yr | 1.00 | infobox |
| 7 Iris | Precession of perihelion long. | 38.403324 arcsec / yr | 1.00 | infobox |
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