Iota Ophiuchi

Iota Ophiuchi
Location of ι Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 54m 00.47151s[1]
Declination 10° 09′ 55.2982″[1]
Apparent magnitude (V) 4.39[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B8V[4]
U−B color index −0.32[5]
B−V color index −0.08[5]
Astrometry
Radial velocity (Rv)−19.0±1.6[6] km/s
Proper motion (μ) RA: −53.80[1] mas/yr
Dec.: −34.04[1] mas/yr
Parallax (π)13.30 ± 0.22 mas[1]
Distance245 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)0.01[2]
Details
Mass3.14±0.03[3] M☉
Radius2.8[7] R☉
Luminosity141+6
−5[3] L☉
Surface gravity (log g)4.03[8] cgs
Temperature11,220±78[3] K
Metallicity [Fe/H]+0.09[8] dex
Rotational velocity (v sin i)124[3] km/s
Age217[9] Myr
Other designations
ι Oph, 25 Oph, BD+10°3092, FK5 1442, GC 22775, HD 152614, HIP 82673, HR 6281, SAO 102458[10]
Database references
SIMBADdata

ι Ophiuchi, Latinized as Iota Ophiuchi, is a single[11] star in the equatorial constellation of Ophiuchus, positioned near the constellation border with Hercules. It makes a naked-eye double with nearby Kappa Ophiuchi,[12] appearing as a faint, blue-white hued star with an apparent visual magnitude of 4.39.[2] The star is approximately 245 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −19 km/s.[6]

This object is a B-type main-sequence star with a stellar classification of B8V.[4] It is an estimated 217[9] million years old with a moderately high rate of spin, showing a projected rotational velocity of 124 km/s.[3] The star has 3.1[3] times the mass of the Sun and around 2.8[7] times the Sun's radius. Iota Ophiuchi is radiating 141[3] times the luminosity of the Sun from its photosphere at an effective temperature of 11,220 K.[3] It displays an infrared excess, suggesting the presence of circumstellar material.[13]

  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 Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1972 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Wu2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Arnold1999 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).