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53 Ophiuchi

53 Ophiuchi
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 34m 36.69409s[1]
Declination +09° 35′ 12.1005″[1]
Apparent magnitude (V) 5.80[2] (5.82 + 7.8)[3]
Characteristics
Spectral type A2 V + A8 IV[4]
Astrometry
53 Oph A
Radial velocity (Rv)−13.9±2.9[5] km/s
Proper motion (μ) RA: +2.126[1] mas/yr
Dec.: −8.530[1] mas/yr
Parallax (π)8.8060 ± 0.0978 mas[1]
Distance370 ± 4 ly
(114 ± 1 pc)
53 Oph B
Proper motion (μ) RA: +1.794[6] mas/yr
Dec.: −8.148[6] mas/yr
Parallax (π)8.8979 ± 0.0413 mas[6]
Distance367 ± 2 ly
(112.4 ± 0.5 pc)
Details
53 Oph Aa
Mass2.50±0.05[7] M☉
Radius1.7[8] R☉
Luminosity56.4+5.3
−4.9[7] L☉
Surface gravity (log g)3.90[9] cgs
Temperature9,311+173
−170[7] K
Metallicity [Fe/H]0.21[9] dex
Rotational velocity (v sin i)29[7] km/s
53 Oph B
Radius1.72+0.06
−0.03[6] R☉
Luminosity7.74±0.05[6] L☉
Temperature7,344+124
−152[6] K
Rotational velocity (v sin i)140[4] km/s
Other designations
f Oph, 53 Oph, HD 159480, HIP 85998, HR 6548, WDS J17346+0935[10]
53 Oph A: BD+09°3424, GC 23824, SAO 122526[10]
53 Oph B: BD+09°3423, GC 23823, SAO 122525[11]
Database references
SIMBADdata

53 Ophiuchi is a multiple star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 5.80.[3] Located around 370 light years distant from the Sun based on parallax,[1] it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s.[5] As of 2011, the visible components had an angular separation of 41.28″ along a position angle of 190°.[12] The primary may itself be a close binary system with a separation of 0.3692″ and a magnitude difference of 3.97 at an infrared wavelength of 562 nm.[13]

The magnitude 5.82[3] primary, designated component Aa, is an A-type main-sequence star with a stellar classification of A2 V.[4] It has 2.5[7] times the mass of the Sun and about 1.7[8] times the Sun's radius. The star is radiating 56 times the Sun's luminosity from its photosphere at an effective temperature of 9,311 K.[7] The widely spaced secondary, designated component B, is a magnitude 7.8[3] A-type subgiant star with a class of A8 IV.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2A was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference levato1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference GaiaDR2B was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Lemke1989 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference SIMBAD1 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD2 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mason2011 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Horch2011 was invoked but never defined (see the help page).

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