Iota Draconis

Iota Draconis / Edasich
Location of ι Draconis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 15h 24m 55.77463s[1]
Declination +58° 57′ 57.8344″[1]
Apparent magnitude (V) 3.290[2]
Characteristics
Evolutionary stage Red giant branch[3]
Spectral type K2III[4]
U−B color index +1.230[2]
B−V color index +1.160[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)−10.71[6] km/s
Proper motion (μ) RA: −8.36[1] mas/yr
Dec.: +17.08[1] mas/yr
Parallax (π)32.23 ± 0.10 mas[1]
Distance101.2 ± 0.3 ly
(31.03 ± 0.10 pc)
Absolute magnitude (MV)0.99±0.007[7]
Details
Mass1.56±0.08[3] M☉
Radius11.99±0.06[3] R☉
Luminosity52.8±2.1[3] L☉
Surface gravity (log g)2.52+0.007
−0.07[3] cgs
Temperature4,504±62[8] K
Metallicity [Fe/H]+0.03±0.08[3] dex
Rotation434 days[5]
Rotational velocity (v sin i)1.5[5] km/s
Age2.49+0.64
−0.62[3] Gyr
Other designations
Edasich, Eldsich,[9] 12 Draconis, BD+59 1654, FK5 425, FK5 571, HD 137759, HIP 75458, HR 5744, SAO 29520, 2MASS J15245578+5857577[10]
Database references
SIMBADdata

Iota Draconis (ι Draconis, abbreviated Iota Dra, ι Dra), also named Edasich /ˈɛdəsɪk/,[11][12] is a star in the northern circumpolar constellation of Draco. A visually unremarkable star of apparent magnitude 3.3,[2] in 2002 it was discovered to have a planet orbiting it[13] (designated Iota Draconis b, later named Hypatia). From parallax measurements, this star is located at a distance of about 101.2 light-years (31.0 parsecs) from the Sun.[1]

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