7 Iris (eye'-ris) is one of the largest main belt asteroids. John Russell Hind (May 12, 1823 – December 23, 1895) was a British astronomer. ... August 13 is the 225th day of the year in the Gregorian Calendar (226th in leap years), with 140 days remaining. ... 1847 was a common year starting on Friday (see link for calendar). ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... Minor planets, or planetoids are minor bodies of the solar system orbiting the sun that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a diameter of about 4880 km). ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... July 14 is the 195th day (196th in leap years) of the year in the Gregorian Calendar, with 170 days remaining. ... 2004 is a leap year starting on Thursday of the Gregorian calendar. ... The Julian day or Julian day number (JDN) is the number of SI days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar 1. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... Giga (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre, or meter, is the basic unit of length in the International System of Units (SI: Système International dUnités). ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A day is any of several different units of time. ... A Julian year is the length of an average year in the Julian calendar, 365. ... The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... The second (symbol s) is a unit for time, and one of seven SI base units. ... Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ... A degree (or in full a degree of arc), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... It has been suggested that Law of universal gravitation be merged into this article or section. ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... Approximately 17% of all known asteroids are of an S-type (for stony) composition. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standardized distance away. ... The albedo is a measure of reflectivity of a surface or body. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ...

Size comparison: the first 10 asteroids profiled against Earth's Moon. Iris is fourth from the right.

It was the seventh asteroid discovered, on August 13, 1847 by J. R. Hind from London, UK. It was Hinds' first asteroid discovery. Image File history File links The first 10 asteroids profiled against the Earths Moon. ... Image File history File links The first 10 asteroids profiled against the Earths Moon. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... August 13 is the 225th day of the year in the Gregorian Calendar (226th in leap years), with 140 days remaining. ... 1847 was a common year starting on Friday (see link for calendar). ... John Russell Hind (May 12, 1823 – December 23, 1895) was a British astronomer. ... The Clock Tower of the Palace of Westminster, which contains Big Ben London is the capital city of the United Kingdom and of England. ...

Name

Iris 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. A rainbow arches over Florida. ... In Greek mythology, Iris was the daughter of Thaumas and the ocean nymph Electra and one of the Oceanids (according to Hesiod), the personification of the rainbow and messenger of the gods. ... Greek mythology comprises the collected narratives of Greek gods, goddesses, heroes, and heroines, originally created and spread within an oral-poetic tradition. ... In Greek mythology, Harpies (robbers) were first beautiful winged women: Hesiod (Theogony) calls them as two lovely-haired creatures. ... Juno was the equivalent of the Greeks Hera, queen of the gods. ... 3 Juno (jew-noh) was discovered on September 1, 1804 by German astronomer Karl L. Harding, using an humble 2-inch telescope. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ...

According to the OED, the correct adjectival form of the name is Iridian. The Oxford English Dictionary (OED) is a comprehensive dictionary published by the Oxford University Press (OUP). ... An adjective is a part of speech which modifies a noun, usually making its meaning more specific. ...

Characteristics

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. In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ... The Pleiades star cluster A star is any massive gaseous body in outer space. ... May 26 is the 146th day of the year in the Gregorian calendar (147th in leap years). ... 1995 was a common year starting on Sunday of the Gregorian calendar. ... July 25 is the 206th day (207th in leap years) of the year in the Gregorian calendar, with 159 days remaining. ... 1997 is a common year starting on Wednesday of the Gregorian calendar. ... For the geometric term, see diameter. ...

The surface of Iris is very bright and is probably a mixture nickel-iron metals and magnesium- and iron-silicates. General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... Metal - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... In chemistry, a silicate is a compound consisting of silicon and oxygen (SixOy), one or more metals, and possibly hydrogen. ...

Aspects

April 12 is the 102nd day of the year in the Gregorian calendar (103rd in leap years). ... 2005 is a common year starting on Saturday of the Gregorian calendar and is the current year. ... June 3 is the 154th day of the year in the Gregorian calendar (155th in leap years), with 211 days remaining. ... 2005 is a common year starting on Saturday of the Gregorian calendar and is the current year. ... July 27 is the 208th day (209th in leap years) of the year in the Gregorian Calendar, with 157 days remaining. ... 2005 is a common year starting on Saturday of the Gregorian calendar and is the current year. ... January 24 is the 24th day of the year in the Gregorian Calendar. ... 2006 is a common year starting on Sunday of the Gregorian calendar. ... October 10 is the 283rd day of the year (284th in Leap years). ... 2006 is a common year starting on Sunday of the Gregorian calendar. ... November 14 is the 318th day of the year (319th in leap years) in the Gregorian Calendar, with 47 days remaining. ... 2006 is a common year starting on Sunday of the Gregorian calendar. ... December 16 is the 350th day of the year (351st in leap years) in the Gregorian Calendar. ... 2006 is a common year starting on Sunday of the Gregorian calendar. ... August 25 is the 237th day of the year in the Gregorian Calendar (238th in leap years), with 129 days remaining. ... 2007 is a common year starting on Monday of the Gregorian calendar. ... February 14 is the 45th day of the year in the Gregorian Calendar. ... Leap year starting on Tuesday // Predicted events January-June January 15 - NASAs MESSENGER spacecraft makes the first of three flybys of Mercury. ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... Leap year starting on Tuesday // Predicted events January-June January 15 - NASAs MESSENGER spacecraft makes the first of three flybys of Mercury. ... May 29 is the 149th day of the year in the Gregorian calendar (150th in leap years). ... Leap year starting on Tuesday // Predicted events January-June January 15 - NASAs MESSENGER spacecraft makes the first of three flybys of Mercury. ... November 21 is the 325th day of the year (326th in leap years) in the Gregorian Calendar. ... Leap year starting on Tuesday // Predicted events January-June January 15 - NASAs MESSENGER spacecraft makes the first of three flybys of Mercury. ... May 15 is the 135th day of the year in the Gregorian Calendar (136th in leap years). ... 2009 is a common year starting on Thursday of the Gregorian calendar. ... July 4 is the 185th day of the year (186th in leap years) in the Gregorian Calendar, with 180 days remaining. ... 2009 is a common year starting on Thursday of the Gregorian calendar. ... August 24 is the 236th day of the year in the Gregorian Calendar (237th in leap years), with 129 days remaining. ... 2009 is a common year starting on Thursday of the Gregorian calendar. ... March 19 is the 78th day of the year in the Gregorian calendar (79th in leap years). ... 2010 is a common year starting on Friday of the Gregorian calendar. ... December 8 is the 342nd day (343rd in leap years) of the year in the Gregorian calendar. ... 2010 is a common year starting on Friday of the Gregorian calendar. ... January 23 is the 23rd day of the year in the Gregorian Calendar. ... 2011 is a common year starting on Saturday of the Gregorian calendar. ... March 6 is the 65th day of the year in the Gregorian Calendar (66th in Leap years). ... 2011 is a common year starting on Saturday of the Gregorian calendar. ... September 28 is the 271st day of the year (272nd in leap years). ... 2011 is a common year starting on Saturday of the Gregorian calendar. ... March 11 is the 70th day of the year in the Gregorian Calendar (71st in Leap year). ... 2012 is a leap year starting on Sunday of the Gregorian calendar. ... May 4 is the 124th day of the year in the Gregorian calendar (125th in leap years). ... 2012 is a leap year starting on Sunday of the Gregorian calendar. ... June 26 is the 177th day of the year (178th in leap years) in the Gregorian Calendar, with 188 days remaining. ... 2012 is a leap year starting on Sunday of the Gregorian calendar. ... December 16 is the 350th day of the year (351st in leap years) in the Gregorian Calendar. ... 2012 is a leap year starting on Sunday of the Gregorian calendar. ... July 1 is the 182nd day of the year (183rd in leap years) in the Gregorian Calendar, with 183 days remaining. ... 2013 is a common year starting on Tuesday of the Gregorian calendar. ... August 16 is the 228th day of the year (229th in leap years) in the Gregorian Calendar. ... 2013 is a common year starting on Tuesday of the Gregorian calendar. ... September 28 is the 271st day of the year (272nd in leap years). ... 2013 is a common year starting on Tuesday of the Gregorian calendar. ... June 16 is the 167th day of the year in the Gregorian calendar (168th in leap years), with 198 days remaining. ... 2014 is a common year starting on Wednesday of the Gregorian calendar. ... January 12 is the 12th day of the year in the Gregorian Calendar. ... 2015 is a common year starting on Thursday of the Gregorian calendar. ... March 6 is the 65th day of the year in the Gregorian Calendar (66th in Leap years). ... 2015 is a common year starting on Thursday of the Gregorian calendar. ... April 21 is the 111th day of the year in the Gregorian calendar (112th in leap years). ... 2015 is a common year starting on Thursday of the Gregorian calendar. ... October 24 is the 297th day of the year (298th in leap years) in the Gregorian Calendar, with 68 days remaining. ... 2015 is a common year starting on Thursday of the Gregorian calendar. ... April 7 is the 97th day of the year in the Gregorian calendar (98th in leap years). ... 2016 is a Leap year starting on Friday. ... May 29 is the 149th day of the year in the Gregorian calendar (150th in leap years). ... 2016 is a Leap year starting on Friday. ... July 22 is the 203rd day (204th in leap years) of the year in the Gregorian Calendar, with 162 days remaining. ... 2016 is a Leap year starting on Friday. ... January 16 is the 16th day of the year in the Gregorian Calendar. ... 2017 is a Common year starting on Sunday. ... September 22 is the 265th day of the year (266th in leap years). ... 2017 is a Common year starting on Sunday. ... October 29 is the 302nd day of the year (303rd in leap years) in the Gregorian Calendar, with 63 days remaining. ... 2017 is a Common year starting on Sunday. ... November 28 is the 332nd day (333rd on leap years) of the year in the Gregorian calendar. ... 2017 is a Common year starting on Sunday. ... August 16 is the 228th day of the year (229th in leap years) in the Gregorian Calendar. ... 2018 is a Common year starting on Monday. ... February 9 is the 40th day of the year in the Gregorian Calendar. ... 2019 is a Common year starting on Tuesday. ... April 5 is the 95th day of the year in the Gregorian calendar (96th in leap years). ... 2019 is a Common year starting on Tuesday. ... May 25 is the 145th day of the year in the Gregorian calendar (146th in leap years). ... 2019 is a Common year starting on Tuesday. ... November 17 is also the name of a Marxist group in Greece. ... 2019 is a Common year starting on Tuesday. ... May 8 is the 128th day of the year in the Gregorian Calendar (129th in leap years). ... 2020 is a leap year starting on Wednesday. ... June 27 is the 178th day of the year (179th in leap years) in the Gregorian Calendar, with 187 days remaining. ... 2020 is a leap year starting on Wednesday. ... August 18 is the 230th day of the year (231st in leap years) in the Gregorian Calendar. ... 2020 is a leap year starting on Wednesday. ... March 6 is the 65th day of the year in the Gregorian Calendar (66th in Leap years). ... 2021 is a common year starting on Friday. ...

External links

• "Discovery of Iris", MNRAS 7 (1847) 299

… | Previous asteroid | 7 Iris | Next asteroid | … 6 Hebe (hee-bee, Greek ‘Ήβη) is a very large Main belt asteroid. ... 8 Flora (flor-a) is a large, bright Main belt asteroid. ...