Beta Aquilae
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(Redirected from Alshain)
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Beta Aquilae |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | 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 r-i = 0.49 |
| B-V color index | 0.86 |
| Variable type | Variable star |
| 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 (uncertain) (variable) 0,02689198551 Year |
| Age | ? years |
| Orbit | |
| Companion | β Aql B |
| Semimajor axis (a) | 12.9" |
| Inclination (i) | 6° |
| Orbit | |
| Companion | β Aql C |
| Semimajor axis (a) | 175" |
| Inclination (i) | 348° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Beta Aquilae (β Aql / β Aquilae) is a star in the constellation Aquila. It has the traditional name Alshain from the Perso-Arabic term الشاهين aš-šāhīn "the (peregrine) falcon", perhaps by folk etymology from the Persian šāhīn tarāzū (or possibly šāhīn tara zed; see γ Aquilae), the Persian name for the asterism α, β and γ Aquilae.
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.
- HR 7602
- 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 |
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