Nu1 Coronae Borealis

For other stars with this Bayer designation, see ν Coronae Borealis.
Nu1 Coronae Borealis

ν1 Coronae Borealis (upper red star) in optical light
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 22m 21.42283s[1]
Declination +33° 47′ 56.5880″[1]
Apparent magnitude (V) 5.20[2]
Characteristics
Spectral type M2 III[3]
B−V color index 1.64[3]
Astrometry
Radial velocity (Rv)−13.01±0.12[1] km/s
Proper motion (μ) RA: +4.756 mas/yr[1]
Dec.: −38.223 mas/yr[1]
Parallax (π)5.0245 ± 0.0843 mas[1]
Distance650 ± 10 ly
(199 ± 3 pc)
Absolute magnitude (MV)−1.19[3]
Details[4]
Radius80.78±2.88 R☉
Luminosity1,257±70 L☉
Temperature3,828 K
Other designations
ν1 Coronae Borealis, 20 CrB, BD+34 2773, HD 147749, HIP 80197, HR 6107, SAO 65257[5]
Database references
SIMBADdata

Nu1 Coronae Borealis is a solitary,[6] red-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.20.[2] Based upon an annual parallax shift of 5.02 mas,[1] it is located roughly 650 light years from the Sun. At its distance, the visual magnitude is diminished by an extinction of 0.1 due to interstellar dust.[7] This object is drifting closer with a radial velocity of −13 km/s.[1]

This is an evolved red giant star with a stellar classification of M2 III.[3] It is a variable star of uncertain type, showing a change in brightness with an amplitude of 0.0114 magnitude and a frequency of 0.22675 cycles per day, or 4.41 days/cycle.[8] It has about 81 times the Sun's radius and is radiating nearly 1,300 times the Sun's luminosity from its photosphere at an effective temperature of 3,828 K.[4]

  1. ^ a b c d e f g Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference huang2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference van Belle was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference koen2002 was invoked but never defined (see the help page).