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41 Ophiuchi

41 Ophiuchi
Location of 41 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 16m 36.68653s[1]
Declination −00° 26′ 43.0915″[1]
Apparent magnitude (V) 4.72[2]
(4.92 + 7.51)[3]
Characteristics
Evolutionary stage horizontal branch[4]
Spectral type K2III[5]
U−B color index +1.11[6]
B−V color index +1.15[6]
Astrometry
Radial velocity (Rv)−0.16[7] km/s
Proper motion (μ) RA: −31.645[1] mas/yr
Dec.: −57.144[1] mas/yr
Parallax (π)16.1517 ± 0.2358 mas[1]
Distance202 ± 3 ly
(61.9 ± 0.9 pc)
Absolute magnitude (MV)0.72[2]
Orbit[8]
Period (P)140.76±0.23 yr
Semi-major axis (a)0.959±0.008″
Eccentricity (e)0.866±0.003
Inclination (i)65.1±0.0°
Longitude of the node (Ω)220.5±0.0°
Periastron epoch (T)1890.53±0.36 B
Argument of periastron (ω)
(secondary)		287.5±0.0°
Details
41 Oph A
Mass1.46[9] M☉
Radius11.80+0.27
−0.39[1] R☉
Luminosity60.3±1.0[1] L☉
Surface gravity (log g)2.42[10] cgs
Temperature4,509±65[9] K
Metallicity [Fe/H]+0.06[2] dex
Rotational velocity (v sin i)2.6[7] km/s
Age3.73[9] Gyr
Other designations
41 Oph, BD−00°3255, GC 23320, HD 156266, HIP 84514, HR 6415, SAO 141586, CCDM J17166-0027AB, WDS J17166-0027[11]
Database references
SIMBADdata

41 Ophiuchi is a binary star[8] system in the zodiac constellation of Ophiuchus, and is positioned less than half a degree to the south of the celestial equator. It is visible to the naked eye as a faint, orange-hued point of light with a combined apparent visual magnitude of 4.72.[2] The distance to this system is approximately 202 light years based on parallax.[12]

This is a visual binary with an orbital period of 141 years and an eccentricity of 0.866.[8] The magnitude 4.92[3] primary, designated component A, is an aging K-type giant star with a stellar classification of K2III.[5] It is a red clump giant,[4] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is 3.7[9] billion years old with 1.46[9] times the mass of the Sun and has expanded to nearly 12[1] times the Sun's radius. It is radiating 60[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,509 K.[9]

The secondary companion, component B, has a visual magnitude of 7.51 and an angular separation of 0.70″ from the primary along a position angle of 22°, as of 2017.[3]

  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 d Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference WDS was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Tokovinin2015 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

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