Albireo A/B/C?
 Albireo's position, lower right corner.
The cross-like figure is the Northern Cross.
The blue line shows the boundaries of the constellation the Swan. | Observation data
Epoch J2000 | Constellation
(pronunciation) | Cygnus | | Right ascension | 19h 30m 43.3s | | Declination | +27° 57' 35" | | Apparent magnitude (V) | 3.08/5.10 | | Characteristics | | Spectral type | (K3 II + B8 V) | | U-B color index | 0.62 | | B-V color index | 1.13 | | Variable type | ? | | Astrometry | | Radial velocity (Rv) | -24.0 km/s | | Proper motion (μ) | RA: -7.09 mas/yr
Dec.: -5.667 mas/yr | | Parallax (π) | 8.46 ± 0.58 mas | | Distance | 385 ly (118 pc) | | Absolute magnitude (MV) | -2.28/-0.26 | | Details | | Mass | 5/3.3 M☉ | | Radius | 55.6/3.1 R☉ | | Luminosity | 950/190 L☉ | | Temperature | 4,300/12,100 K | | Metallicity | ? | | Rotation | ?/0.6d | | Age | ? years | | Visual binary orbit | | Companion | Albireo B | | Period (P) | 96.840 yr | | Semimajor axis (a) | 0.586" | | Eccentricity (e) | 0.719 | | Inclination (i) | 118.000° | | Longitude of the node (Ω) | 98.800° | | Periastron epoch (T) | 2010.270 | | Visual binary orbit | | Companion | Albireo C | | Semimajor axis (a) | 34.5" | | Inclination (i) | 54° | | Other designations | β Cyg, NSV 12105, 6 Cyg, HR 7417, HD 183912, SAO 87301, BD +27 3410, FK5: 732, WDS 19307+2758A | | Database references | | SIMBAD | data | Albireo (β Cyg / β Cygni / Beta Cygni) is the third brightest star in the constellation Cygnus. Although it has the Bayer designation "beta", it is actually fainter than Gamma Cygni. Wikipedia does not have an article with this exact name. ...
In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ...
This article is about the star grouping. ...
From the dawn of time, poop observed the sky and grouped stars into patterns or constellations. ...
Cygnus (IPA: , Latin: ) is a northern constellation. ...
Equatorial Coordinates Right ascension (abbrev. ...
In astronomy, declination (abbrev. ...
The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ...
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. ...
In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. ...
In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. ...
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Illustration of the use of optical wavelength interferometry to determine precise positions of stars. ...
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 (from Old English gēr) 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 (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
For other uses, see Parallax (disambiguation). ...
A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ...
Distance is a numerical description of how far apart objects are at any given moment in time. ...
A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one year. ...
A parsec is the distance from the Earth to an astronomical object which has a parallax angle of one arcsecond. ...
In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ...
For other uses, see Mass (disambiguation). ...
In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ...
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In astronomy, the solar radius is a unit of length used to express the size of stars and larger objects such as galaxies. ...
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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. ...
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The globular cluster M80. ...
This illustration shows the oblate appearance of the star Achernar caused by rapid rotation. ...
This article is about the astronomical object. ...
A year (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
For the band of the same name, see: Binary Star (band) Hubble image of the Sirius binary system, in which Sirius B can be clearly distinguished (lower left). ...
The orbital period is the time it takes a planet (or another object) to make one full orbit. ...
A year (from Old English gēr) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ...
In astrodynamics, under standard assumptions any orbit must be of conic section shape. ...
For the science fiction novella by William Shunn, see Inclination (novella). ...
It has been suggested that this article or section be merged into Orbital node. ...
This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ...
In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ...
For the band of the same name, see: Binary Star (band) Hubble image of the Sirius binary system, in which Sirius B can be clearly distinguished (lower left). ...
In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ...
For the science fiction novella by William Shunn, see Inclination (novella). ...
A star catalogue, or star catalog, is an astronomical catalog that lists stars. ...
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. ...
SIMBAD (the Set of Identifications, Measurements, and Bibliography for Astronomical Data) is a database of astronomical information about objects within the Milky Way. ...
Beta (upper case Β, lower case β) is the second letter of the Greek alphabet. ...
This article is about the star grouping. ...
Cygnus (IPA: , Latin: ) is a northern constellation. ...
The tone or style of this article or section may not be appropriate for Wikipedia. ...
Sadr (also spelled Sadir or Sador) is the star Gamma Cygni. ...
Since Cygnus is "the swan", and Albireo is located at the head of the swan, it is sometimes called the "beak star". It also forms the "Northern Cross" along with Deneb, Delta Cygni and Epsilon Cygni. Deneb (α Cyg / α Cygni / Alpha Cygni) is the brightest star in the constellation Cygnus and one of the vertices of the Summer Triangle. ...
Delta Cygni (δ Cyg / δ Cygni) is a third-magnitude star in the constellation Cygnus. ...
Epsilon Cygni (ε Cyg / ε Cygni) is a star in the constellation Cygnus. ...
 The two component stars of Albireo are easily distinguished, even in a small telescope. The name of the star originates in misunderstandings and bad translations. The name of the star was originally Minqār al-Dajājah, "the hen's beak," as in Arab texts. Latin scholars misunderstood and thought that the name came from a kind of herb, and translated it into ab ireo ("from ireus"). Later this was treated as a misprint of an Arabic term and transcribed as al-bireo. Albireo from Yeovil 8 SCT Philips Toucam WebCam - Jim Spinner 26/10/2004 20:00 BST File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Albireo from Yeovil 8 SCT Philips Toucam WebCam - Jim Spinner 26/10/2004 20:00 BST File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Albireo is 385 light years away from the Earth. With bare eyes Albireo seems like a single star. However, when viewed with a telescope it readily resolves into a double star, one yellow (apparent magnitude 3.1), the other blue (apparent magnitude 5.1). Separated by 34 seconds of arc, the two components provide one of the best contrasting double stars in the sky due to their different colors. A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one year. ...
This article is about Earth as a planet. ...
This article does not cite any references or sources. ...
When two stars are so nearly in the same direction as seen from Earth that they appear to be a single star to the naked eye but may be separated by the use of telescopes, they are referred to as a double star. ...
The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ...
They had been considered as merely an optical double, not orbiting around a common point as a true binary star system would be. However, in spite of the large distance between them, it has been shown that they are a true binary system. This topic is about the astronomical phenomenon. ...
For the band of the same name, see: Binary Star (band) Hubble image of the Sirius binary system, in which Sirius B can be clearly distinguished (lower left). ...
The brighter, yellow member of the pair, Beta Cygni A, is itself a close binary.
Albireo as a triple Star
The brighter A component of the wide pair was itself resolved as a binary star using large telescopes and image processing techniques (speckle interferometry) in 1976. Some fifty measurements since then have shown a position-angle change between the stars of about 50 degrees, which is not yet sufficient to yield an orbital determination. The current separation of around 0.4 arcseconds is tantalizingly close to the limit which visual observations through instruments of at least 20" in size under very rare perfect conditions of seeing can resolve. It has also been referred to as the most beautiful binary star in the sloar system. Speckle imaging (also known as video astronomy) describes a range of high-resolution astronomical imaging techniques based either on the shift-and-add (image stacking) method or on speckle interferometry methods. ...
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