Upsilon Coronae Borealis

Not to be confused with U Coronae Borealis.
Upsilon Coronae Borealis
Location of υ CrB (red circle)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 16m 44.78733s[1]
Declination +29° 09′ 00.9399″[1]
Apparent magnitude (V) 5.78[2]
Characteristics
Spectral type A3V[3]
U−B color index +0.10[2]
B−V color index +0.07[2]
Astrometry
Radial velocity (Rv)0.8±1.0[4] km/s
Proper motion (μ) RA: +23.474[1] mas/yr
Dec.: −16.644[1] mas/yr
Parallax (π)5.1783 ± 0.0777 mas[1]
Distance630 ± 9 ly
(193 ± 3 pc)
Absolute magnitude (MV)−0.72[5]
Details
Mass3.06±0.19[6] M☉
Radius6.2[7][a] R☉
Luminosity151[7] L☉
Temperature8,098[7] K
Rotational velocity (v sin i)112[3] km/s
Other designations
υ CrB, 18 Coronae Borealis, NSV 7596, BD+29°2803, FK5 3287, HD 146738, HIP 79757, HR 6074, SAO 84281, WDS J16167+2909[8]
Database references
SIMBADdata

Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary[9] star in the northern constellation of Corona Borealis. It is a white-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.78.[2] The distance to this object is approximately 630 light-years (190 parsecs) based on parallax.[1]

This is an A-type main-sequence star with a stellar classification of A3V;[3] a star that is currently fusing its core hydrogen. However, Palmer et al. (1968) had it classed as type A2IV,[10] and thus it may be near or past its main sequence lifetime.[6] It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.78 down to 5.88.[11]

Upsilon Coronae Borealis has three[6] times the mass of the Sun and about six times the Sun's radius.[7] It is spinning with a projected rotational velocity of 112 km/s.[3] The star is radiating 151[7] times the luminosity of the Sun from its photosphere at an effective temperature of 8,098 K.[7]

  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 Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Royer2007 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 zorec2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference rob135_385 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).


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