Mu Ophiuchi

Mu Ophiuchi
Location of μ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 37m 50.71308s[1]
Declination −8° 07′ 07.5749″[1]
Apparent magnitude (V) 4.62[2]
Characteristics
Spectral type B8II-IIIp:Mn[3]
U−B color index −0.20[2]
B−V color index +0.11[2]
Astrometry
Radial velocity (Rv)−18.50[4] km/s
Proper motion (μ) RA: −11.31[5] mas/yr
Dec.: −20.47[5] mas/yr
Parallax (π)4.32 ± 0.20 mas[5]
Distance750 ± 30 ly
(230 ± 10 pc)
Absolute magnitude (MV)-2.24[6]
Details
Radius11.1+2.1
−0.6[1] R☉
Luminosity398.7±26.8[1] L☉
Temperature7,748+210
−651[1] K
Metallicity [Fe/H]+0.00[7] dex
Rotational velocity (v sin i)95[8] km/s
Other designations
μ Oph, 57 Ophiuchi, BD−08°4472, FK5 3399, GC 23889, HD 159975, HIP 86284, HR 6567, SAO 141772[9]
Database references
SIMBADdata

μ Ophiuchi, Latinized as Mu Ophiuchi, is a solitary,[10] blue-white hued star in the equatorial constellation of Ophiuchus. It is visible to the naked as a faint point of light with an apparent visual magnitude of 4.62.[2] This object is located approximately 760 light years away from the Sun based on parallax,[5] but is drifting closer with a radial velocity of −18.5 km/s.[4]

This object has a stellar classification of B8II-IIIp:Mn,[3] showing a luminosity class with mixed traits of a giant or bright giant star. The suffix notation indicates it is a candidate chemically peculiar star with an overabundance of manganese in its spectrum. It may be a mercury-manganese star.[11] This object has 11 times the radius of the Sun and is radiating nearly 400 times the Sun's luminosity from its photosphere at an effective temperature of 7,748 K.[1] It is spinning with a projected rotational velocity of 95 km/s.[8]

In 2006, a new nearby star cluster, Mamajek 2 (/ˈmæmədʒɛk/), was discovered. Mu Ophiuchi is a candidate member.[12] The cluster has an estimated age of 120±25 million years.[13]

  1. ^ a b c d e f 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 Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1972 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mamajek2006 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Jilinski2009 was invoked but never defined (see the help page).