Zeta Draconis

ζ Draconis
Location of ζ Draconis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 08m 47.19596s[1]
Declination +65° 42′ 52.8634″[1]
Apparent magnitude (V) +3.17[2]
Characteristics
Spectral type B6 III[3]
U−B color index –0.43[2]
B−V color index –0.11[2]
Astrometry
Radial velocity (Rv)–17[4] km/s
Proper motion (μ) RA: –20.43[1] mas/yr
Dec.: +19.61[1] mas/yr
Parallax (π)9.93 ± 0.35 mas[1]
Distance330 ± 10 ly
(101 ± 4 pc)
Absolute magnitude (MV)−1.88[5]
Details
Mass3.5[6] M☉
Radius2.3[6] R☉
Luminosity148[6] L☉
Surface gravity (log g)4.24[3] cgs
Temperature13,397[3] K
Metallicity [Fe/H]–0.95[3] dex
Rotational velocity (v sin i)55[7] km/s
Other designations
22 Draconis, BD+65 1170, FK5 639, HD 155763, HIP 83895, HR 6396, SAO 17365, WDS 17088+6543.[8]
Database references
SIMBADdata

Zeta Draconis (ζ Draconis, abbreviated Zet Dra, ζ Dra) is a binary star in the northern circumpolar constellation of Draco. With an apparent visual magnitude of +3.17,[2] it is the fifth-brightest member of this generally faint constellation. Its distance from the Sun has been measured using the parallax technique, yielding an estimate of roughly 330 light-years (100 parsecs).[1]

The two components are designated Zeta Draconis A (formally named Aldhibah /ælˈdaɪbə/, after the traditional name of the system)[9] and B.

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  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference mnras374_2_664 was invoked but never defined (see the help page).
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  6. ^ a b c Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
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  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.