71 Ophiuchi

71 Ophiuchi
Location of 71 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 18h 07m 18.35888s[1]
Declination +08° 44′ 01.9181″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type G8III[3]
U−B color index +0.73[4]
B−V color index +0.97[4]
Astrometry
Radial velocity (Rv)−3.00±0.09[5] km/s
Proper motion (μ) RA: +9.857[1] mas/yr
Dec.: +29.770[1] mas/yr
Parallax (π)13.1352 ± 0.1891 mas[1]
Distance248 ± 4 ly
(76 ± 1 pc)
Absolute magnitude (MV)0.03[2]
Details[6]
Mass2.87±0.09 M☉
Radius12.55+0.27
−0.34[1] R☉
Luminosity88.8±1.5[1] L☉
Surface gravity (log g)3.00±0.02 cgs
Temperature5,001+70
−52[1] K
Metallicity [Fe/H]0.10±0.01 dex
Rotational velocity (v sin i)0.32±0.45 km/s
Age400±30 Gyr
Other designations
71 Oph, BD+08°3582, GC 24693, HD 165760, HIP 88765, HR 6770, SAO 123140[7]
Database references
SIMBADdata

71 Ophiuchi is a single[8] star in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.64.[2] The star is located approximately 273 light years away from the Sun based on parallax,[9] and is moving closer with a radial velocity of −3 km/s.[5]

At the estimated age of 400 million years,[6] this is an aging giant star with a stellar classification of G8III,[3] having exhausted the supply of hydrogen at its core and expanded to around 13[1] times the Sun's radius. It is a red clump giant,[10] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 2.9 times the mass of the Sun and is radiating 89 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,001 K.[6]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 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 Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Jofré2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).