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Location of Delta Aquilae near the center of the constellation. |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aquila |
| Right ascension | 19h 25m 29.9005s |
| Declination | +03° 06′ 53.191″ |
| Apparent magnitude (V) | 3.4 |
| Characteristics | |
| Spectral type | F0IV |
| U−B color index | 0.04 |
| B−V color index | 0.32 |
| R−I color index | 0.16 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | -30.1 km/s |
| Proper motion (μ) | RA: 253.07 mas/yr Dec.: 80.67 mas/yr |
| Parallax (π) | 65.05 ± 0.81 mas |
| Distance | 50.1 ± 0.6 ly (15.4 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.46 |
| Details | |
| Mass | 1.65 M☉ |
| Radius | 1.5 R☉ |
| Luminosity | 8.2 L☉ |
| Temperature | 7,600 K |
| Rotation | 85 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Delta Aquilae (δ Aql, δ Aquilae) is a triple star system in the constellation Aquila. It is approximately 50.1 light years from Earth.
Sometimes, this star is called by the name Denebokab, meaning the tail of eagle in Arabic. In Chinese, 右旗 (Yòu Qí), meaning Right Flag, refers to an asterism consisting of δ Aquilae, μ Aquilae, σ Aquilae, ν Aquilae, ι Aquilae, 42 Aquilae, HD 184701, κ Aquilae and 56 Aquilae.[1] Consequently, δ Aquilae itself is known as 右旗三 (Yòu Qí sān, English: the Third Star of Right Flag.)[2]
In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Djenubi Menkib al Nesr (منكب ألنسر ألخنوبي - mankib al-nasr al-janúbii), which was translated into Latin as Australior Humerus Vulturis, meaning the southern shoulder of the eagle.[3]
This star, along with η Aql and θ Aql (Tseen Foo) and, were Al Mizān (ألميزان), the Scale-beam.[4] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Mizān were the title for three stars :δ Aql as Al Mizān I, η Aql as l Mizān II and θ Aql as Al Mizān III[5]
Delta Aquilae is an astrometric binary. The visible component is a yellow-white F-type subgiant with an apparent magnitude of +3.36. The orbital period of the binary is 3.422 years. The visible component is also a spectroscopic binary, bringing the total number of components to three. The spectroscopic binary has an orbital period of 3.77 hours.
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