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] |
Distance | 330 ± 10 ly (101 ± 4 pc) |
Absolute magnitude (MV) | −1.88[5] |
Details | |
Mass | 3.5[6] M☉ |
Radius | 2.3[6] R☉ |
Luminosity | 148[6] L☉ |
Surface gravity (log g) | 4.24[3] cgs |
Temperature | 13,397[3] K |
Metallicity [Fe/H] | –0.95[3] dex |
Rotational velocity (v sin i) | 55[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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.
aaa474_2_653
was invoked but never defined (see the help page).clpl4_99
was invoked but never defined (see the help page).mnras374_2_664
was invoked but never defined (see the help page).rgcrv
was invoked but never defined (see the help page).huang2012
was invoked but never defined (see the help page).aass85_3_1015
was invoked but never defined (see the help page).aaa393
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).