- Delta Equulei
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Delta Equulei Observation data
Epoch J2000 Equinox J2000Constellation Equuleus Right ascension 21h 14m 28.8152s Declination +10° 00' 25.132"' Apparent magnitude (V) 4.49 / 5.4 Characteristics Spectral type F5V+ / G0 U−B color index -0.01 B−V color index 0.5 Variable type None Astrometry Radial velocity (Rv) -15.4 km/s Proper motion (μ) RA: 42.32 mas/yr
Dec.: -303.43 mas/yrParallax (π) 54.11 ± 0.85 mas Distance 60.3 ± 0.9 ly
(18.5 ± 0.3 pc)Absolute magnitude (MV) 4.99 Details Mass 1.22 / 1.17 M☉ Radius 1.19 / 0.525 R☉ Luminosity 2.23 / 2.17 L☉ Age 1.6 - 2.8 billion years Orbit Companion Delta Equulei B Period (P) 5.7 yr Semimajor axis (a) 0.26" Eccentricity (e) 0.42 Inclination (i) 100° Longitude of the node (Ω) 23° Periastron epoch (T) 1912.77 Other designations Database references SIMBAD data Delta Equulei is the second brightest star in the constellation Equuleus. Delta Equulei is a binary star system about 60 light years away,[1] with components of class G0 and F5.[2] Their combined magnitude is 4.47, and their absolute magnitude is 3.142. There is controversy as to the exact masses of the stars. One study puts the larger at 1.22 solar masses and the smaller at 1.17, while another pegs them at 1.66 and 1.593.[2] The luminosity of the larger star is calculated to be 2.23 solar, and the smaller to be 2.17.[2]
References
- ^ SkyGazer, College Edition, version 3.4
- ^ a b c "Delta Equulei". University of Illinois Astronomy department. http://www.astro.uiuc.edu/~kaler/sow/deltaequ.html.
External links
- "HD 202275 -- Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+202275. Retrieved 2007-01-22.
- Delta Equulei
Star systems within 60–70 light-years from Earth with brightest member's absolute magnitude of +8.5 or brighter.Rho Puppis «Tureis» (62.7 ± 0.8 ly; 1 star)Theta Centauri «Menkent» (60.9 ± 0.9 ly; 1 star) • Aldebaran (65.1 ± 1.3 ly; 2 stars) • Epsilon Scorpii «Wei» (65.4 ± 1.1 ly; 1 star) • Alpha Arietis «Hamal» (65.9 ± 1.3 ly; 1 star, 1 planet: planet b)Beta Arietis «Sheratan» (59.6 ± 0.8 ly; 2 stars)‡ • Beta Pictoris (62.9 ± 0.6 ly; 1 star, 1 planet: planet b)Psi Velorum (59.7 ± 1.0 ly; 2 stars)‡ • Mu Virginis (60.9 ± 1.1 ly; 1 star)‡ • Alpha Chamaeleontis (63.5 ± 0.6 ly; 1 star) • Alpha Trianguli «Metallah» (64.1 ± 1.0 ly; 2 stars) • Eta Crucis (64.2 ± 0.6 ly; 2 stars) • Tau Cygni (66.4 ± 0.8 ly; 4 stars) • Theta Draconis (68.3 ± 0.8 ly; 2 stars) • Iota Virginis «Syrma» (69.8 ± 1.3 ly; 1 star)‡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)‡ • Theta Cygni (60.7 ± 0.5 ly; 2 stars) • HR 1249 (62.7 ± 0.9 ly; 1 star) • 1 Centauri (62.8 ± 0.9 ly; 2 stars) • Omicron Aquilae (63.3 ± 0.9 ly; 3 stars) • c (45) Boötis (64.3 ± 1.0 ly; 2 stars) • Alpha Caeli (65.7 ± 0.7 ly; 2 stars) • Kappa Tucanae (66.04 ± 1.2 ly; 4 stars) • Gamma Doradus (66.2 ± 0.7 ly; 1 star) • Sigma² Ursae Majoris (66.7 ± 0.9 ly; 3 stars) • HR 1686 (68.4 ± 0.8 ly; 2 stars, 1 planet: planet b) • B Carinae (69.8 + 5.4/- 4.7 ly; 1 star)‡94 Aquarii (67.6 + 8.3/- 6.6 ly; 2 stars)‡ • Gliese 848.4 (69.4 ± 1.2 ly; 1 star, 1 planet: planet b)‡HD 217107 (64.3 ± 1.0 ly; 1 star, 2 planets: planet b • planet c) • 53 Aquarii (65.5 ± 3.5 ly; 2 stars) • GJ 3255 (67.4 ± 1.5 ly; 1 star, 1 planet: planet b) • 51 Arietis (69.0 ± 1.3 ly; 1 star)‡ • c (16) Cygni (69.8 ± 0.8 ly; 2 stars, 1 planet: planet Bb)‡Epsilon Reticuli (59.5 ± 0.5 ly; 1 star, 1 planet: planet b)‡ • Eta Serpentis «Tang» (61.8 ± 0.9 ly; 1 star) • Nu² Canis Majoris (64.7 ± 0.9 ly; 1 star, 1 planet: planet b)GJ 4130 (62.8 ± 1.1 ly; 2 stars, 1 planet: planet b) • Gliese 710 (63.0 ± 1.8 ly; 1 star) • HD 192263 (64.9 ± 1.5 ly; 1 star, 1 planet: planet b) • GJ 3769 (66.6 ± 1.5 ly; 1 star, 1 planet: planet b) • GJ 3651 (69.5 ± 1.5 ly; 1 star, 1 planet: planet b)‡ • GJ 4291 (70.2 ± 2.0 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.Bayer α (Kitalpha) • β • γ • δ • 1 (ε) • ζ • λFlamsteed 1 (ε) • 2 (λ) • 3 (ζ) • 4 • 5 (γ) • 6 • 7 (δ) • 8 (α, Kitalpha) • 9 • 10 (β)Categories:- Main sequence star stubs
- Multiple star stubs
- Variable star stubs
- Variable stars
- Eclipsing binaries
- Spectroscopic binaries
- Henry Draper Catalogue objects
- Bayer objects
- Equuleus constellation
- Binary stars
- G-type main sequence stars
- F-type main sequence stars
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