Eta Aquilae
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| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 52m 28.4s |
| Declination | +1° 00' 20" |
| Apparent magnitude (V) | +3.87 |
| Absolute magnitude (V) | -3.91 |
| Distance | 1180 ± 390 ly (360 ± 120 pc) |
| Spectral type | F6Ib |
| Other designations | |
Eta Aquilae (η Aql / η Aquilae) is a star in the constellation Aquila. It was also part of the former constellation Antinous. In addition, this star carries the seldom used Hebrew name Bezek or Bazak, meaning "lightning".
It is a Cepheid variable star, varying from apparent magnitude 3.6 to 4.4 with a period of 7.176641 days. Along with Delta Cephei, Zeta Geminorum and Beta Doradus, it is one of the most prominent naked eye Cepheids; that is, both the star itself and the variation in its brightness can be distinguished by the naked eye. Some other Cepheids such as Polaris are bright but have only a very small variation in brightness.
It is about 1200 light years from Earth. It is a yellow-white supergiant, and is about 3000 times more luminous than the Sun, with a diameter about 60 times that of the Sun.
[edit] Location
The star's location in the constellation of Aquila is shown in the following map:
[edit] References
- HD 187929 -- Classical Cepheid (Delta Cep Type). SIMBAD Astronomical Database. Retrieved on 2007-01-21.
[edit] External links
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