Iota Draconis
 Location of ι Draconis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 15h 24m 55.77463s |
| Declination | +58° 57′ 57.8344″ |
| Apparent magnitude (V) | 3.290 |
| Characteristics | |
| Spectral type | K2 III |
| U−B color index | +1.230 |
| B−V color index | +1.160 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | –10.71 km/s |
| Proper motion (μ) |
RA: –8.36 mas/yr Dec.: +17.08 mas/yr |
| Parallax (π) | 32.23 ± 0.10mas |
| Distance | 101.2 ± 0.3 ly (31.03 ± 0.10 pc) |
| Absolute magnitude (MV) | 0.99±0.007 |
| Details | |
| Mass | 1.82 ± 0.23 M☉ |
| Radius | 11.99 ± 0.06 R☉ |
| Luminosity | 55.3 ± 5.3 L☉ |
| Surface gravity (log g) | 2.5 cgs |
| Temperature | 4,545 ± 110 K |
| Metallicity [Fe/H] | +0.14 dex |
| Rotation | 434 days |
| Rotational velocity (v sin i) | 1.5 km/s |
| Age | 10.015 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota Draconis (ι Draconis, abbreviated Iota Dra, ι Dra), also named Edasich, is a star in the northern circumpolar constellation of Draco. A visually unremarkable star of apparent magnitude 3.3, in 2002 it was discovered to have a planet orbiting it (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.
ι Draconis (Latinised to Iota Draconis) is the star's Bayer designation. On discovery the planet was designated Iota Draconis b (or Edasich b).
It bore the traditional name Edasich, derived from the Arabic Al Ḍhiba' of Ulug Beg and the Dresden Globe, or Al dhīlī 'Male hyena' by Kazwini, with Eldsich being recorded in the Century Cyclopedia. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Edasich for this star.
In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Hypatia for this planet. The winning name was submitted by Hypatia, a student society of the Physics Faculty of the Universidad Complutense de Madrid, Spain. Hypatia was a famous Greek astronomer, mathematician, and philosopher.
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