- Delta Aquilae
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δ Aquilae 
Location of Delta Aquilae near the center of the constellation.Observation data
Epoch J2000 Equinox J2000Constellation 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/yrParallax (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.)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]
Structure
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.
References
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ^ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society 55: 429. Bibcode 1895MNRAS..55..429K.
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 61. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Aquila*.html. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
External links
- Jim Kaler's Stars, University of Illinois: DELTA AQL (Delta Aquilae)
- An Atlas of the Universe: Multiple Star Orbits
Star systems within 50–60 light-years from Earth with brightest member's absolute magnitude of +8.5 or brighter. Castor (51.6 ± 1.0 ly; 6 stars) • Delta Leonis «Zosma» (57.7 ± 0.9 ly; 2 stars) • Iota Centauri «Alhakim» (58.6 ± 0.8 ly; 1 star) • Beta Arietis «Sheratan» (59.6 ± 0.8 ly; 2 stars)‡Delta Aquilae «Denebokab» (50.1 ± 0.6 ly; 3 stars)‡ • I Carinae (52.9 ± 0.4 ly; 1 star) • Beta Cassiopeiae «Caph» (54.5 ± 0.5 ly; 2 stars) • Xi Geminorum «Alzirr» (57.2 ± 0.8 ly; 1 star) • Psi Velorum (59.7 ± 1.0 ly; 2 stars)‡ • Mu Virginis (60.9 ± 1.1 ly; 1 star)‡Sigma Boötis «Hemelein Secunda» (50.4 ± 0.6 ly; 2 stars)‡ • Tau Boötis (50.9 ± 0.6 ly; 2 stars, 1 planet: planet b) • Alpha Circini (53.5 ± 0.5 ly; 2 stars) • q¹ Eridani (56.6 ± 0.6 ly; 1 star, 1 planet: planet b) • g Lupi (57.1 ± 0.7 ly; 1 star) • Alpha Comae Berenices «Diadem» (58.3 ± 1.5 ly; 3 stars) • Delta Geminorum «Wasat» (58.8 ± 0.9 ly; 3 stars) • Chi Cancri (59.2 ± 1.0 ly; 1 star)‡ • Eta Corvi «Avis Satyra» (59.4 ± 0.7 ly; 1 star)‡ • Delta Equulei «Pherasauval» (60.0 ± 1.0 ly; 2 stars)‡Chi Eridani (57.0 ± 0.6 ly; 2 stars)Mu Arae (49.8 ± 0.6 ly; 1 star, 4 planets: planet d • planet e • planet b • planet c)‡ • 51 Pegasi (50.1 ± 0.6 ly; 1 star, 1 planet: planet b «Bellerophon»)‡ • HR 7368 (50.5 ± 0.5 ly; 1 star, 2 brown dwarfs: brown dwarf C • brown dwarf B) • HR 2007 (50.8 ± 0.9 ly; 1 star, 1 planet: planet b)‡ • HR 8323 (51.0 ± 0.6 ly; 1 star) • HR 7670 (51.8 ± 0.5 ly; 3 stars, 2 planets: planet c • planet b) • Psi⁵ Aurigae (53.9 ± 0.6 ly; 1 star) • HR 3538 (55.8 ± 0.8 ly; 1 star) • Iota Horologii (56.2 ± 0.5 ly; 1 star, 1 planet: planet b) • 37 Geminorum (56.3 ± 0.9 ly; 1 star) • Rho Coronae Borealis (56.8 ± 0.7 ly; 1 star, 1 planet: planet b) • GJ 3021 (57.5 ± 0.5 ly; 1 star, 1 planet: planet b) • 15 Sagittae (57.6 ± 0.6 ly; 1 star, 1 brown dwarf) • HR 7644 (57.8 ± 0.8 ly; 1 star, 1 planet: planet b) • HR 5534 (58.5 ± 0.9 ly; 1 star, 2 brown dwarfs) • Gliese 651 (58.9 ± 0.6 ly; 1 star, 1 planet: planet b) • 70 Virginis (59.1 ± 0.8 ly; 1 star, 1 planet: planet b) • Pi Mensae (59.4 ± 0.5 ly; 1 star, 1 planet: planet b)83 Leonis (57.6 ± 1.5 ly; 2 stars, 2 planets: planet Bb • planet Bc) • Epsilon Reticuli (59.5 ± 0.5 ly; 1 star, 1 planet: planet b)‡GJ 3860 (54.0 ± 0.9 ly; 1 star, 2 planets) • Gliese 56.5 (54.9 ± 0.5 ly; 1 star, 1 planet: planet b) • HD 87883 (58.9 ± 1.0 ly; 1 star, 1 planet: planet b) • Gliese 652 (59.0 ± 0.9 ly; 1 star, 1 planet: planet b) • 14 Herculis (59.2 ± 0.6 ly; 1 star, 1 planet: planet b)In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Italic are systems possibly located within declared distance interval, but probably not. Stars of Aquila Bayer Flamsteed 4 • 5 • 7 • 8 • 10 • 11 • 12 (i) • 13 (ε) • 14 (g) • 15 (h) • 16 (λ) • 17 (ζ, Deneb el Okab) • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 (ω¹) • 26 (f) • 27 (d) • 28 (A) • 29 (ω²) • 30 (δ) • 31 (b) • 32 (ν) • 35 (c) • 36 (e) • 37 • 38 (μ) • 39 (κ) • 41 (ι, Al Thalimain) • 42 • 44 (σ) • 45 • 46 • 47 (χ) • 48 (ψ) • 49 (υ) • 50 (γ, Tarazed) • 51 • 52 (π) • 53 (α, Altair) • 54 (ο) • 55 (η) • 56 • 57 • 58 • 59 (ξ) • 60 (β, Alshain) • 61 (φ) • 62 • 63 (τ) • 64 • 65 (θ, Tseen Foo) • 66 • 67 (ρ) (till 1992) • 68 • 69 • 70 • 71 (l) • 14 Sge • 62 SerList Categories:- Henry Draper Catalogue objects
- Binary stars
- Spectroscopic binaries
- Bayer objects
- Aquila constellation
- Astrometric binaries
- Triple star systems
- F-type subgiants
- Subgiant star stubs
- Variable star stubs
- Multiple star stubs
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