Gliese 204
Encyclopedia
Gliese 204 is an orange K5 V class star
found in the night sky at right ascension
05h 5 m 7 s and declination
-03° 31' -03 ° 31 ' putting it in the constellation
of Orion
. http://translate.google.com.au/translate?hl=en&sl=it&u=http://it.wikipedia.org/wiki/Gliese_204&ei=s02oTOuLKI60vgPUqMTwDA&sa=X&oi=translate&ct=result&resnum=7&ved=0CCkQ7gEwBjgo&prev=/search%3Fq%3DGliese%2B204%26start%3D40%26hl%3Den%26sa%3DN
An absolute magnitude
of 7.65 and a distance
of 45.8 light years
(13.01 parsec
s) from the Sun means that this star is not visible to the naked eye
and so was not discovered until 1907.
The star has a total proper motion
of 854.07 mas/year, a measured parallax
of 77.03 mas (71.2 ± 6.9 mas)http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00444.htm http://iopscience.iop.org/1538-3881/129/2/1063/datafile2.txt and a Radial velocity
-54.0 km/second http://www.hs.uni-hamburg.de/~st1h314/nstarpage.cgi?identifier=0629
As a K5 V class star Gliese
204 is in the main sequence
on the Hertzsprung–Russell diagram
but slightly smaller and cooler than sun like stars.
The star is also known by the following designations. Gl
204, Hip 25623, HD
36003, LHS 1763, BD
-03 1110.
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
found in the night sky at right ascension
Right ascension
Right ascension is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.-Explanation:...
05h 5 m 7 s and declination
Declination
In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is comparable to geographic latitude, but projected onto the celestial sphere. Declination is measured in degrees north and...
-03° 31' -03 ° 31 ' putting it in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
of Orion
Orion (constellation)
Orion, often referred to as The Hunter, is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous, and most recognizable constellations in the night sky...
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An absolute magnitude
Absolute magnitude
Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...
of 7.65 and a distance
Distance
Distance is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria . In mathematics, a distance function or metric is a generalization of the concept of physical distance...
of 45.8 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
(13.01 parsec
Parsec
The parsec is a unit of length used in astronomy. It is about 3.26 light-years, or just under 31 trillion kilometres ....
s) from the Sun means that this star is not visible to the naked eye
Naked eye
The naked eye is a figure of speech referring to human visual perception unaided by a magnifying or light-collecting optical device, such as a telescope or microscope. Vision corrected to normal acuity using corrective lenses is considered "naked"...
and so was not discovered until 1907.
The star has a total proper motion
Proper motion
The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system. It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree. This contrasts with radial velocity, which is the time rate of change in...
of 854.07 mas/year, a measured parallax
Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. The term is derived from the Greek παράλλαξις , meaning "alteration"...
of 77.03 mas (71.2 ± 6.9 mas)http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00444.htm http://iopscience.iop.org/1538-3881/129/2/1063/datafile2.txt and a Radial velocity
Radial velocity
Radial velocity is the velocity of an object in the direction of the line of sight . In astronomy, radial velocity most commonly refers to the spectroscopic radial velocity...
-54.0 km/second http://www.hs.uni-hamburg.de/~st1h314/nstarpage.cgi?identifier=0629
As a K5 V class star Gliese
Gliese Catalogue of Nearby Stars
The Gliese Catalogue of Nearby Stars is a frequently referenced, modern star catalogue of stars located within 25 parsecs of the Earth.-First edition and supplements:...
204 is in the main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
on the Hertzsprung–Russell diagram
Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral types or classifications and effective temperatures. Hertzsprung–Russell diagrams are not pictures or maps of the locations of the stars...
but slightly smaller and cooler than sun like stars.
The star is also known by the following designations. Gl
Gliese Catalogue of Nearby Stars
The Gliese Catalogue of Nearby Stars is a frequently referenced, modern star catalogue of stars located within 25 parsecs of the Earth.-First edition and supplements:...
204, Hip 25623, HD
Henry Draper Catalogue
The Henry Draper Catalogue is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension , published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the...
36003, LHS 1763, BD
Durchmusterung
In astronomy, Durchmusterung or Bonner Durchmusterung , is the usual name for three comprehensive astrometric star catalogues of the whole sky, processed by the Bonn Observatory from 1859 to 1903....
-03 1110.
External links
- The Millennium Star Atlas
- NEXXUS 2 - The database for Nearby X-ray and extreme UV emitting stars
- Hipparchus Catalogue 1997
- Stars within 15 Parsecs
- S. M. Lawler et al. 2010 The Astrophysical Journal Issue Volume 711, Number 2 pp1297.
- A photo of the star