Beta Aquilae
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Observation data Epoch J2000 |
|
---|---|
Constellation (pronunciation) |
Aquila |
Right ascension | 19h 55m 18.8s |
Declination | +06° 24′ 24″ |
Apparent magnitude (V) | 3.71/11.4 |
Characteristics | |
Spectral type | G8 IVvar/M3 |
U-B color index | 0.48 |
B-V color index | 0.86 |
Variable type | Suspected |
Astrometry | |
Radial velocity (Rv) | -40.3 km/s |
Proper motion (μ) | RA: 46.35 mas/yr Dec.: -481.32 mas/yr |
Parallax (π) | 72.95 ± 0.83 mas |
Distance | 44.7 ± 0.5 ly (13.7 ± 0.2 pc) |
Absolute magnitude (MV) | 3.03/10.7 |
Details | |
Mass | 1.3 M☉ |
Radius | 3.1 R☉ |
Luminosity | 6 L☉ |
Temperature | 5,100 K |
Metallicity | ? |
Rotation | ~16 km/s. |
Age | ? years |
Visual binary orbit | |
Companion | β Aql B |
Semimajor axis (a) | 12.9" |
Inclination (i) | 6° |
Visual binary orbit | |
Companion | β Aql C |
Semimajor axis (a) | 175" |
Inclination (i) | 348° |
Other designations | |
Database references | |
SIMBAD | data |
Beta Aquilae (β Aql / β Aquilae) is a star in the constellation Aquila. It also has the traditional name Alshain from the Arabic term الشاهين aš-šāhīn "the (peregrine) falcon". This pseudo-Arabic name is derived from the Persian Šāhīn tarāzū (or possibly Šāhīn tara zed; see γ Aquilae), the Persian name for the asterism α, β and γ Aquilae. In Persian, Šāhīn means "royal falcon", "beam", and "pointer".
Beta Aquilae has magnitude 3.71 and is of spectral class G8IV. It is approximately 44.7 light years from Earth. It has a 12th magnitude companion, β Aquilae B, which is 13 arcseconds away on the sky.
Contents |
[edit] In Fiction
[edit] Location
The star's location in the constellation of Aquila is shown in the following map:
[edit] External links
- ARICNS
- Beta Aquilae by Professor Jim Kaler.
- http://www.alcyone.de/cgi-bin/search.pl?object=HR7602
- Image β Aquilae
[edit] Components
NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
---|---|---|---|---|---|
β Aquilae B (GJ 771 B) | 19h 55m 18.8s | +06° 24' 36 | 11.4 | M3 | Simbad |
β Aquilae C (BD+06 4357C) | 19h 55m 17.5s | +06° 26' 01 | 10.5 | Simbad |