|
18 Scorpii is a star located some 45.7 light years from earth at the northern edge of the Scorpius constellation. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ...
The J2000. ...
Pierce this website is not very reliable!!!!!!!!!!!!!!!!! Some well-known constellations contain striking and familiar patterns of bright stars. ...
Scorpius (Latin for scorpion, symbol , Unicode â™) is one of the constellations of the zodiac. ...
Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) 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. ...
// Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ...
In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ...
Shanil Davendra Singh rules 4 life! ...
Shanil Davendra Singh rules 4 life! ...
Most stars are of almost constant luminosity. ...
This article does not cite its references or sources. ...
Radial velocity is the velocity of an object in the direction of the line of sight. ...
kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. ...
The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real...
A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
Parallax (Greek: παÏαλλαγή (parallagé) = alteration) is the change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer. ...
A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ...
The distance between two points is the length of a straight line segment between them. ...
A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...
The parsec (symbol pc) is a unit of length used in astronomy. ...
In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us. ...
Mass is a property of a physical object that quantifies the amount of matter it contains. ...
In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ...
RADIUS (Remote Authentication Dial In User Service) is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ...
In astronomy, the solar radius is a unit of length used to express the size of stars and larger objects such as galaxies. ...
Luminosity has different meanings in several different fields of science. ...
The solar luminosity is a unit of luminosity (power emitted in the form of photons) conventionally used by astronomers to give the luminosities of stars. ...
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. ...
In astronomy, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. ...
Rotation of a plane, seen as the rotation of the terrain relative to the plane (exposure time 1. ...
The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
In astronomy, many stars are referred to simply by catalogue numbers. ...
The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ...
Scorpius (Latin for scorpion, symbol , Unicode â™) is one of the constellations of the zodiac. ...
18 Scorpii has many physical properties in common with the Sun and is regarded by some astronomers as the nearest solar twin. Due to this fact some scientists believe that the prospects for life in its vicinity are good. The Sun is the spectral type G2V yellow star at the center of Earths solar system. ...
A solar twin is a star with characteristics similar to our own Sun. ...
Star characteristics
18 Scorpii is a yellow main sequence dwarf star of spectral and luminosity type G1-5 V-Va. Its metallicity is about 1.05 to 1.12 that of the Sun.[1][2] In astronomy, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. ...
According to Lookwood, 2002,[3] it has a temporal photometric behavior very similar to the Sun however, according to Lookwood, 2000,[4] the activity cycle of 18 Scorpii may be of greater amplitude than the Sun's and that its overall chromospheric activity level is noticeably greater than the Sun's. This excellent solar photometric twin therefore may be a less perfect spectroscopic twin.
18 Scorpii is a solitary star. It is unknown at the moment whether it has planets.
Prospects for life 18 Scorpii was identified in September 2003 by astrobiologist Margaret Turnbull from the University of Arizona in Tucson as one of the most promising nearby candidates for hosting life based on her analysis of the HabCat list of stars. This article is being considered for deletion in accordance with Wikipedias deletion policy. ...
The references in this article would be clearer with a different style of citation, footnoting or external linking. ...
A city street near downtown Tucson, Arizona. ...
The Catalog of Nearby Habitable Systems (HabCat) is a catalog of star systems which concievably have habitable planets. ...
See also The following is a partial list of stars which have their own articles in Wikipedia. ...
This list of the nearest stars to Earth is ordered by increasing distance out to a maximum of 5 parsecs (16. ...
37 Geminorum is a star located at the northwest part of the constellation Gemini. ...
Understanding planetary habitability is partly an extrapolation of the Earths conditions, as it is the only planet currently known to harbor life. ...
A solar twin is a star with characteristics similar to our own Sun. ...
Artists conception of a space habitat called the Stanford torus, by Don Davis Space colonization, also called space settlement and space humanization, is the hypothetical permanent autonomous (self-sufficient) human habitation of locations outside Earth. ...
HD 98618 is a star 126 light years from Earth which is almost identical in composition and size to the sun. ...
References - ↑ Porto de Mello and da Silva, 1997.
- ↑ Cayrel de Strobel et al, 1991.
- ↑ Lookwood et al, 2002.
- ↑ Lookwood et al, 2000.
External links - NASA article on 18 Scorpii
- 18 Scorpii entry in the stellar database
|
Feeds |
Contact