Omicron Coronae Borealis

o Coronae Borealis
Location of o Coronae Borealis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis
Right ascension 15h 20m 08.559s[1]
Declination +29° 36′ 58.35″[1]
Apparent magnitude (V) +5.53[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.786[2]
B−V color index +1.009[2]
Astrometry
Radial velocity (Rv)−54.15±0.20[4] km/s
Proper motion (μ) RA: −117.98±0.18[1] mas/yr
Dec.: −42.44±0.31[1] mas/yr
Parallax (π)12.08 ± 0.44 mas[1]
Distance270 ± 10 ly
(83 ± 3 pc)
Absolute magnitude (MV)+0.92[3]
Details[4]
Mass1.07±0.19 M☉
Radius10.13±0.40 R☉
Luminosity50.1 L☉
Surface gravity (log g)2.70±0.06 cgs
Temperature4,812±13 K
Metallicity [Fe/H]−0.24±0.01 dex
Rotational velocity (v sin i)0.47±0.61 km/s
Age5.54±2.79 Gyr
Other designations
o CrB, 1 Coronae Borealis, BD+30° 2647, HD 136512, HIP 75049, HR 5709, SAO 83768, WDS J15201+2937A, 2MASS J15200853+2936584
Database references
SIMBADdata
Exoplanet Archivedata

Omicron Coronae Borealis, Latinized from o Coronae Borealis, is a star in the northern constellation of Corona Borealis. It is a faint star but visible to the naked eye on a dark night with an apparent visual magnitude of +5.53.[2] The annual parallax shift of the star as seen from Earth is 12.08 mas, which provides a distance estimate of around 270 light years. It is moving closer to the Sun with a radial velocity of −54 km/s.[4]

Based upon the spectrum of this star, it has a stellar classification of K0 III.[3] This indicates this is an evolved K-type giant star that has exhausted the hydrogen at its core and has left the main sequence. This is a red clump star, which means it is now generating energy through helium fusion at its core. It has 107% of the mass of the Sun and has expanded to over ten times the Sun's radius. The star is radiating 50 times the Sun's luminosity from its expanded photosphere at an effective temperature of 4,812 K.[5]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference jofre2015 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Sato2012 was invoked but never defined (see the help page).