Back 72 Ophiuchi AST 72 del Serpentari Catalan HD165777 CE 72 Ophiuchi Spanish ۷۲ مارافسای Persian 72 Ophiuchi French 72 Ophiuchi ID 72 Ophiuchi Italian へびつかい座72番星 Japanese 72 Змееносца Russian

72 Ophiuchi

72 Ophiuchi
Location of 72 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 18h 07m 20.98393s[1]
Declination 9° 33′ 49.8501″[1]
Apparent magnitude (V) 3.73[2] + 14.0[3]
Characteristics
Spectral type A5 V[4]
U−B color index +0.10[2]
B−V color index +0.12[2]
Astrometry
Radial velocity (Rv)-23.90[5] km/s
Proper motion (μ) RA: -62.17[1] mas/yr
Dec.: +79.66[1] mas/yr
Parallax (π)37.55 ± 0.21 mas[1]
Distance86.9 ± 0.5 ly
(26.6 ± 0.1 pc)
Absolute magnitude (MV)1.58[6]
Details
Mass1.99[7] M☉
Radius1.9[8] R☉
Luminosity20[7] L☉
Surface gravity (log g)4.04[9] cgs
Temperature8,718[9] K
Metallicity [Fe/H]+0.09[6] dex
Rotational velocity (v sin i)65[7] km/s
Age250[9] Myr
Other designations
72 Oph, BD+09°3564, FK5 680, GC 24695, GJ 9615 A, HD 165777, HIP 88771, HR 6771, SAO 123142, CCDM J18073+0934A, WDS J18073+0934A[10]
Database references
SIMBADdata

72 Ophiuchi is a binary star[3] system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint, white-hued point of light with a combined apparent visual magnitude of 3.73.[2] It is located approximately 86.9 light years away from the Sun based on parallax,[1] but is moving closer with a heliocentric radial velocity of -23.9 km/s.[5]

As of 2008, the pair had an angular separation of 25″.[3] According to Gray et al. (2003), the primary component has a stellar classification of A5 V,[4] matching an A-type main-sequence star. Cowley et al. (1969) had assigned it to a class of A4 IVs,[11] suggesting it is a sharp-lined (s) subgiant star. The latter class is still in use by some sources.[7][3][12]

The primary is 250[9] million years old with double[7] the mass of the Sun and is spinning with a moderate projected rotational velocity of 65 km/s.[7] It is radiating 20[7] times the luminosity of the Sun from its photosphere at an effective temperature of 8,718 K.[9] It displays an infrared excess, suggesting a debris disk is orbiting the star with a mean separation of 82.96 AU and temperature of 60 K.[13] The system is a source of X-ray emission,[12] which is most likely coming from the 14th[3] magnitude companion.[12]

There are additional visual companions: component C with magnitude 11.5 lies at an angular separation of 64″ from the primary,[14] while component D, has magnitude 14.8 and separation 24".[15]

This star was once considered part of the obsolete constellation Taurus Poniatovii, the brightest star in it. After the International Astronomical Union officially recognised constellations, it was placed in Ophiuchus.[16]

  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 Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2003 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference XHIP was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference David2015 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 Cowley1969 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference DeRosa2011 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference gaspar2016 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Renson was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference ridpath was invoked but never defined (see the help page).

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