Tarazed
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Star Tarazed (γ Aquilae) |
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| AladinLite | |||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Eagle | ||||||||||||||||||
| Right ascension | 19 h 46 m 15.58 s | ||||||||||||||||||
| declination | + 10 ° 36 ′ 47.7 ″ | ||||||||||||||||||
| Apparent brightness | 2.72 mag | ||||||||||||||||||
| Typing | |||||||||||||||||||
| B − V color index | +1.52 | ||||||||||||||||||
| U − B color index | +1.68 | ||||||||||||||||||
| R − I index | +0.75 | ||||||||||||||||||
| Spectral class | K3 II | ||||||||||||||||||
| Astrometry | |||||||||||||||||||
| Radial velocity | (−2.8 ± 0.1) km / s | ||||||||||||||||||
| parallax | (8.26 ± 0.17) mas | ||||||||||||||||||
| distance | (394.9 ± 8.1) Lj (121.1 ± 2.5) pc |
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| Visual absolute brightness M vis | −2.70 mag | ||||||||||||||||||
| Proper movement | |||||||||||||||||||
| Rec. Share: | (16.99 ± 0.18) mas / a | ||||||||||||||||||
| Dec. portion: | (−2.98 ± 0.08) mas / a | ||||||||||||||||||
| Physical Properties | |||||||||||||||||||
| Dimensions | ~ 5 M ☉ | ||||||||||||||||||
| radius | ~ 110 R ☉ | ||||||||||||||||||
| Luminosity |
3000 L ☉ |
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| Effective temperature | 4100 K | ||||||||||||||||||
| Age | ~ 100 million a | ||||||||||||||||||
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Other names and catalog entries |
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Tarazed (also Tarazad, Tarazet, Reda ) is the name of the star Gamma Aquilae (γ Aquilae, γ Aql for short) in the constellation Eagle . The name is Persian and means "balance beam". Tarazed has an apparent magnitude of +2.72 mag and is about 400 light years away from the sun. It is a bright orange giant belonging to the spectral class K3 and is in the stage of stellar evolution in which it burns helium to carbon in its core . Its radius is calculated from its luminosity (again determined from apparent brightness and distance) of around 3000 solar luminosities to an enormous 110 solar radii or 0.5 AU . This means that it is large enough that its angular diameter can also be measured directly to 0.0075 arc seconds, from which, together with its distance, a similar value for its physical diameter as the one given above is calculated. Tarazed is also an X-ray source.
In the television series Andromeda , Tarazed is the fourth planet of a yellow dwarf in one of the three galaxies (Milky Way, Andromeda, and Triangulum) and is a remote and difficult-to-reach place.