HD 45088
Encyclopedia
HD 45088 is a visual binary
or possible Triple star
located in the night sky
at RA
06h 26m 10s and dec
+18° 45′ 25″ http://iopscience.iop.org/1538-3881/129/2/1063/204381.text.html in the constellation
of Gemini
.
The system has an absolute magnitude
of 5.91, so at a distance
of 48.2 light Years it has an apparent magnitude
of 6.76 when viewed from earth
. It also has a total Proper Motion
of 0.210"/yr
and belongs to the Ursa Major stream.
The system is a much studied BY Draconis variable
star with a period of 6.99 days
http://www.ucm.es/info/Astrof/users/dmg/papers/pwIII/node10.html http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1980PASP...92..218B&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES
Binary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
or possible Triple star
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...
located in the night sky
Night sky
The term night sky refers to the sky as seen at night. The term is usually associated with astronomy, with reference to views of celestial bodies such as stars, the Moon, and planets that become visible on a clear night after the Sun has set. Natural light sources in a night sky include moonlight,...
at RA
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:...
06h 26m 10s and dec
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...
+18° 45′ 25″ http://iopscience.iop.org/1538-3881/129/2/1063/204381.text.html 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 Gemini
Gemini (constellation)
Gemini is one of the constellations of the zodiac. It was one of the 48 constellations described by the 2nd century astronomer Ptolemy and it remains one of the 88 modern constellations today. Its name is Latin for "twins", and it is associated with the twins Castor and Pollux in Greek mythology...
.
The system has 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 5.91, so at a distance
Distance measures (cosmology)
Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe. They are often used to tie some observable quantity to another quantity that is not directly...
of 48.2 light Years it has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of 6.76 when viewed from earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It also 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 0.210"/yr
Year
A year is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic....
and belongs to the Ursa Major stream.
The system is a much studied BY Draconis variable
BY Draconis variable
BY Draconis variables are main sequence variable stars of late spectral types, usually K or M. The name comes from the archetype for this category of variable star system, BY Draconis. They exhibit variations in their luminosity due to rotation of the star coupled with star spots, and other...
star with a period of 6.99 days
http://www.ucm.es/info/Astrof/users/dmg/papers/pwIII/node10.html http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1980PASP...92..218B&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES
- The primary star, Gl 233 A, is a K2Ve classStar classStar class could refer to:* Star-class sailboats raced in the Summer Olympic Games since 1932* GWR star-class locomotives from the 19th century.* GWR 4000 class locomotives from the early 20th century.* Stellar classification...
starStarA 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...
with a luminosity of 1.26817e+26, surface temperature of 5013±15kKelvinThe kelvin is a unit of measurement for temperature. It is one of the seven base units in the International System of Units and is assigned the unit symbol K. The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all...
and a radial velocityRadial velocityRadial 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...
of -8.6.http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00499.htm It has no known planets.
- The primary star is also known as HIP-30630, BD+DurchmusterungIn 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....
18° 1214, SAOSmithsonian Astrophysical Observatory Star CatalogThe Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue. It was published by the Smithsonian Astrophysical Observatory in 1966 and contains 258,997 stars. The catalogue was...
95677, YPC: 1489.00, ADS 5054 and by the variable designation OU Gem.
- The secondary star in the system has a surface temperatureEffective temperatureThe effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation...
of 4486±50 KKelvinThe kelvin is a unit of measurement for temperature. It is one of the seven base units in the International System of Units and is assigned the unit symbol K. The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all...
and orbits the primary in about seven days. It is known as Gl 233 B or YPC: 1489.00. http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00500.htmhttp://webcache.googleusercontent.com/search?hl=en&q=cache:x4z15I1OsBMJ:http://cdsweb.cern.ch/record/411408/files/9912160.pdf+OU+Gem&ct=clnk