21 Comae Berenices

21 Comae Berenices

A visual band light curve for UU Comae Berenices from MOST data. Adapted from Paunzen et al. (2019)[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Coma Berenices
Right ascension 12h 31m 00.561s[2]
Declination +24° 34′ 01.80″[2]
Apparent magnitude (V) 5.47[3] or 5.41 – 5.46[4]
Characteristics
Evolutionary stage main sequence[1]
Spectral type A3p SrCr[5]
B−V color index 0.056±0.008[3]
Variable type α2 CVn[1] + δ Sct[4]
Astrometry
Radial velocity (Rv)+1.0±1.8[3] km/s
Proper motion (μ) RA: −12.474 mas/yr[2]
Dec.: −9.085 mas/yr[2]
Parallax (π)12.0785 ± 0.1214 mas[2]
Distance270 ± 3 ly
(82.8 ± 0.8 pc)
Absolute magnitude (MV)0.66[3]
Details[1]
Mass2.29±0.10 M☉
Radius2.6±0.2 R☉
Luminosity38.2±1.3 L☉
Surface gravity (log g)3.9±0.2 cgs
Temperature8,900±200 K
Rotation2.05219 d
Rotational velocity (v sin i)63±2 km/s
Age400–800 Myr
Other designations
Kissīn[6], 21 Com, UU Com, BD+25°2517, HD 108945, HIP 61071, HR 4766, SAO 82346[7]
Database references
SIMBADdata

21 Comae Berenices is a variable star in the northern constellation of Coma Berenices.[8] It has the variable star designation UU Comae Berenices, while 21 Comae Berenices is the Flamsteed designation.[7][8][9]

  1. ^ a b c d Cite error: The named reference Paunzen2019 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Allen1963 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ a b "21 Comae Berenices - Star in Coma Berenices | TheSkyLive.com". theskylive.com. Retrieved 2023-06-13.
  9. ^ Guide, Universe (25 January 2015). "21 Comae Berenices Star Facts". Universe Guide. Retrieved 13 June 2023.