Iota Gruis

Iota Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 23h 10m 21.53755s[1]
Declination −45° 14′ 48.1647″[1]
Apparent magnitude (V) 3.90[2]
Characteristics
Spectral type K1 III[3]
U−B color index +0.86[2]
B−V color index +1.02[2]
Astrometry
Radial velocity (Rv)−4.4[4] km/s
Proper motion (μ) RA: +132.50[1] mas/yr
Dec.: −26.66[1] mas/yr
Parallax (π)17.80 ± 0.33 mas[1]
Distance183 ± 3 ly
(56 ± 1 pc)
Absolute magnitude (MV)+0.13[5]
Orbit[6][7]
Period (P)409.614 d
Semi-major axis (a)7.82±0.47 mas
Eccentricity (e)0.66
Inclination (i)114.3±5.2°
Periastron epoch (T)2416115.569 JD
Argument of periastron (ω)
(secondary)		240.8°
Semi-amplitude (K1)
(primary)		13.6 km/s
Details
ι Gru A
Luminosity107[5] L☉
Other designations
ι Gru, CD−45° 14947, FK5 1605, HD 218670, HIP 114421, HR 8820, SAO 231468[8]
Database references
SIMBADdata

Iota Gruis, Latinized from ι Gruis, is a binary star[6] system in the southern constellation of Grus. It has an apparent visual magnitude of 3.90,[2] which is bright enough to be seen with the naked eye at night. The distance to this system, as determined using an annual parallax shift of 17.80 mas as seen from the Earth,[1] is about 183 light years.

This is a single-lined spectroscopic binary with an orbital period of 409.6 days (1.121 years) and an eccentricity of 0.66.[6] The yellow-hued primary component is an evolved K-type giant star with a stellar classification of K1 III.[3] It is an X-ray emitter with a flux of 441.31×10−17 W/m2.[9]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Jancart2005 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Schmitt1998 was invoked but never defined (see the help page).