Gamma Aquilae
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γ Aquilae |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aquila |
| Right ascension | 19h 46m 15.5795s |
| Declination | +10° 36′ 47.74″ |
| Apparent magnitude (V) | 2.724 |
| Characteristics | |
| Spectral type | K3II |
| U-B color index | 1.68 |
| B-V color index | 1.52 |
| Astrometry | |
| Radial velocity (Rv) | -2.8 km/s |
| Proper motion (μ) | RA: 15.72 mas/yr Dec.: -3.08 mas/yr |
| Parallax (π) | 7.08 ± 0.75 mas |
| Distance | approx. 460 ly (approx. 140 pc) |
| Absolute magnitude (MV) | -3.03 |
| Details | |
| Mass | 5 M☉ |
| Radius | 110 R☉ |
| Luminosity | 3000 L☉ |
| Temperature | 4100 K |
| Metallicity | ? |
| Rotation | <17 km/s (uncertain) (variable) 0,007348 Year |
| Age | ? years |
| Orbit | |
| Companion | γ Aquilae B |
| Semimajor axis (a) | 132.6" |
| Inclination (i) | 258° |
| Other designations | |
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TARAZED, 2MASS J19461557+1036475, SRS 30741, * 50 Aql, GSC 01061-02577, N30 4372, TD1 25398,* gam Aql, HD 186791, NSV 24880, TYC 1061-2577-1, AG+10° 2518, HIC 97278, PLX 4645, UBV 16822, BD+10° 4043, HIP 97278, PMC 90-93 527, UBV M 24125, CCDM J19462+1037A, HR 7525, PPM 136931, uvby98 100186791, CSI+10° 4043 1, IDS 19415+1022 A, RAFGL 2453, YZ 10° 7453, FK5 741, IRAS 19438+1029, ROT 2845, GC 27354, IRC +10439, SAO 105223, GCRV 12137, JP11 3130.
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| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Gamma Aquilae (γ Aql / γ Aquilae) is a star in the constellation Aquila. It has the traditional name Tarazed (occasionally Reda), which appears to derive from Persian شاهين ترازو šāhin tarāzu "the beam of the scale", referring to an asterism of the Scale, α, β and γ Aquillae. Persian šāhīn means "royal falcon", "beam", and "pointer", and gave its name (as "falcon") to Beta Aquilae.
It has an apparent magnitude of 2.72 and is of spectral class K3, giving it a decidedly yellowish orange hue in appearance. It is a giant star with a diameter of approximately half an AU, and its angular diameter can be detected and measured to be 0.0075 arcseconds. It is approximately 461 light years from Earth. The age of Gamma Aquilae is "only" about 100 million years. Nevertheless the star is already burning helium into carbon in its core.
The Koori people of Victoria knew β and γ Aquilae as the Black Swan wives of Bunjil (Altair), the Wedge-tailed Eagle.[1]
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[edit] Location
The star's location in the constellation of Aquila is shown in the following map:
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Database references |
|---|---|---|---|---|
| γ Aquilae B (BD+10 4043B) | 19h 46m 06.6s | +10° 36' 19 | 10.8 | Simbad |
[edit] See also
- Gamma Aquilae in fiction
- Gamma Aquilae by Simbad
- Gamma Aquilae by Jim Kaler
- http://www.uma.pt/Investigacao/Astro/Grupo/Sextas_astronomicas/Sexta8/sexta8.htm
- Tarazed
- http://www.scenta.co.uk/tcaep/nonxml/astronomy/constellations/19460060.htm
- HR 7525
- Image Gamma Aquilae
[edit] References
- ^ Mudrooroo (1994). Aboriginal mythology : an A-Z spanning the history of aboriginal mythology from the earliest legends to the present day. London: HarperCollins. p. 4. ISBN 1855383063.
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