Gamma Virginis (γ Vir / γ Virginis) is a star in the constellation Virgo. It also has the traditional name Porrima. Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... See VIRGO (physics) for a French-Italian project in physics. ...

Gamma Virginis is a binary star, consisting of two stars of approximately equal apparent magnitude 3.6 and spectral type F0V: HD 110379 and HD 110380. With an orbital period of 168.68 years (calculated by Heintz at Sproul Observatory in 1990) until the beginning of the 1990s it was an easy object for amateur astronomers, but now the smaller apparent distance between the stars requires a larger telescope. The last time they were at periapsis was in 1836. The distance will again be wide enough in 2020 to view with a small telescope. The star system has a combined apparent magnitude of 2.9. The system is 32 light years away from the sun. Binary star A binary star system consists of two stars both orbiting around their barycenter. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Events and trends Technology The World Wide Web was born at CERN Explosive growth of the Internet; decrease in the cost of computers and other technology Reduction in size and cost of mobile phones leads to a massive surge in their popularity Year 2000 problem (commonly known as Y2K) Microsoft... Amateur astronomy, often called back yard astronomy, is a hobby whose participants enjoy observing celestial objects. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... 2020 is a leap year starting on Wednesday. ... A Sun is the star at the center of a solar system. ...

As Gamma Virginis is close to the ecliptic, it can be occulted by the Moon and (extremely rarely) by planets. The plane of the Ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... In Islam the occulation is the name given to the disappearance of the Twelfth Imam. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... A planet (from the Greek πλανήτης, planētēs which means wanderer or more forcefully vagrant, tramp) is a body of considerable mass that orbits a star and that produces no energy through nuclear fusion. ...

Changes of distance and position angle

This table shows the apparant distance between the two stars and their relative position angle: first three columns show data predicted from an orbit calculated in 1937, the next three columns show observations reported by the Hanwell Community Observatory.

Coordinates (equinox J2000.0) The J2000. ...

• Right ascension: 12h41m39s
• Declination: -01° 26' 57.9"

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. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ...

External links

• SIMBAD Query results for HD 110379 (http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+110379&Radius=10&CooEqui=2000&output.bib=&output.mes=o.catall%2C&output.mesdisp=N&Frame1=FK5&Equi1=2000.0&Epoch1=2000.0&Frame2=none&Equi2=1950.0&Epoch2=1950.0&Frame3=none&Equi3=2000.0&Epoch3=2000.0&FrameList=FK5&EquiList=2000.0&EpochList=2000.0&Bibyear1=1983&Bibyear2=2005&output.mesdisp=A)
• SIMBAD Query results for HD 110380 (http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+110380&Radius=10&CooEqui=2000&output.bib=&output.mes=o.catall%2C&output.mesdisp=N&Frame1=FK5&Equi1=2000.0&Epoch1=2000.0&Frame2=FK4&Equi2=1950.0&Epoch2=1950.0&Frame3=G&Equi3=2000.0&Epoch3=2000.0&FrameList=FK5&EquiList=2000.0&EpochList=2000.0&Bibyear1=1983&Bibyear2=2005&output.mesdisp=A)