Sigma Aquilae
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 39m 11.6415s |
| Declination | +05° 23′ 51.984″ |
| Apparent magnitude (V) | 5.178 |
| Characteristics | |
| Spectral type | B3V+ |
| U−B color index | -0.6 |
| B−V color index | 0.03 |
| Variable type | Beta Lyrae variables |
| Astrometry | |
| Radial velocity (Rv) | -4.8 km/s |
| Proper motion (μ) | RA: 2.08 mas/yr Dec.: -3.78 mas/yr |
| Parallax (π) | 4.78 ± 0.82 mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | 5.176 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Rotation | 121 Km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Sigma Aquilae (σ Aql, σ Aquilae) is a binary star in the constellation Aquila. It is approximately 680 light years from Earth.
Sigma Aquilae is an eclipsing spectroscopic binary. Both components are detached blue-white B-type main sequence dwarfs which do not fill their Roche lobes. The mean apparent magnitude of the binary is +5.18. Because it is an eclipsing binary, σ Aquilae is also a variable star and its brightness varies by 0.2 magnitudes with a period equal to its orbital period of 1.95 days.
[edit] References
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