Mu Coronae Borealis

Mu Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 35m 14.91848s[1]
Declination +39° 00′ 36.2473″[1]
Apparent magnitude (V) 5.12[2]
Characteristics
Spectral type M1.5 IIIb[3]
U−B color index +2.01[2]
B−V color index +1.64[2]
Astrometry
Radial velocity (Rv)−13.17±0.35[4] km/s
Proper motion (μ) RA: +24.45[1] mas/yr
Dec.: +9.22[1] mas/yr
Parallax (π)5.27 ± 0.24 mas[1]
Distance620 ± 30 ly
(190 ± 9 pc)
Absolute magnitude (MV)−1.25[5]
Details
Luminosity932[6] L☉
Temperature3,889[6] K
Other designations
μ CrB, 6 CrB, BD+34° 2773, HD 139153, HIP 76307, HR 5800[7]
Database references
SIMBADdata

Mu Coronae Borealis, Latinized from μ Coronae Borealis, is a solitary,[8] ruby-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.12.[2] Based upon an annual parallax shift of 5.27 mas,[1] it is located roughly 620 light years from the Sun. This is an evolved red giant star with a stellar classification of M1.5 IIIb.[3] It is currently on the asymptotic giant branch[9] and is a variable star of uncertain type, showing a change in brightness with an amplitude of 0.0147 magnitude and a frequency of 0.02455 cycles per day, or 40.7 days/cycle.[10] On average, it is radiating 932 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,889 K.[6]

  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 Walker1971 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Mcdonald2012 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 eggen1992 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference koen2002 was invoked but never defined (see the help page).