Beta Delphini

β Delphini
Location of β Delphini (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension 20h 37m 32.94130s[1]
Declination +14° 35′ 42.3195″[1]
Apparent magnitude (V) 3.617±0.016[2] (4.11 + 5.01)[3]
Characteristics
Spectral type F5 III + F5 IV[4]
B−V color index A: 0.43±0.14
B: 0.56±0.25[1]
Astrometry
Beta Delphini A
Proper motion (μ) RA: +118.09[1] mas/yr
Dec.: -48.06[1] mas/yr
Parallax (π)32.33 ± 0.47 mas[1]
Distance101 ± 1 ly
(30.9 ± 0.4 pc)
Absolute magnitude (MV)1.58±0.12[2]
Beta Delphini B
Absolute magnitude (MV)2.79±0.14[2]
Orbit[3]
Period (P)26.660 yr
Semi-major axis (a)0.440″
Eccentricity (e)0.36
Inclination (i)61°
Longitude of the node (Ω)177°
Periastron epoch (T)1989.50 yr
Argument of periastron (ω)
(secondary)		349°
Semi-amplitude (K1)
(primary)		7.6[5] km/s
Details
Beta Delphini A
Mass1.75±0.002[2] M☉
Luminosity24[6] L☉
Surface gravity (log g)3.50[6] cgs
Temperature6587[6] K
Metallicity [Fe/H]–0.05[2] dex
Rotational velocity (v sin i)49.8[6] km/s
Age1.79+0.17
−0.72[2] Gyr
Beta Delphini B
Mass1.47±0.04[2] M☉
Luminosity8[7] L☉
Other designations
Rotanev, Rotanen, Venator, β Del, Beta Delphini, Beta Del, 6 Delphini, 6 Del, BD+14 4369, HD 196524, HIP 101769, HR 7882, SAO 106316, WDS 20375+1436AB.[8][9][10]
Database references
SIMBADdata

Beta Delphini (β Delphini, abbreviated Beta Del, β Del) is a binary star in the constellation of Delphinus. It is the brightest star in Delphinus.

The two components of the system are designated Beta Delphini A (officially named Rotanev /ˈroʊtənɛv/, which is historically the name of the system)[11][12] and B.

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference aj138_5_1354 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aaa341_121 was invoked but never defined (see the help page).
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  6. ^ a b c d Cite error: The named reference aaa409_251 was invoked but never defined (see the help page).
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  10. ^ Cite error: The named reference bsc1 was invoked but never defined (see the help page).
  11. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  12. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.