Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Corona Borealis
Right ascension
15h 43m 59.29973s[1]
Declination
+32° 30′ 56.9047″[1]
Apparent magnitude (V)
5.578[2]
Characteristics
Spectral type
G9 III:[2]
B−V color index
1.074[3]
Astrometry
Radial velocity (Rv)
−4.94±0.51[3] km/s
Proper motion (μ)
RA: −29.92[1] mas/yr Dec.: −8.85[1] mas/yr
Parallax (π)
13.40 ± 0.21 mas[1]
Distance
243 ± 4 ly (75 ± 1 pc)
Absolute magnitude (MV)
+1.21[4]
Details[3]
Mass
1.61[2]M☉
Radius
10 R☉
Luminosity
39 L☉
Surface gravity (log g)
2.7 cgs
Temperature
4,667±5 K
Metallicity [Fe/H]
−0.15 dex
Rotational velocity (v sin i)
3.5 km/s
Age
4.6[2] Gyr
Other designations
π CrB, 9 CrB, BD+32° 2621, HD 140716, HIP 77048, HR 5855, SAO 64870[5]
Database references
SIMBAD
data
Pi Coronae Borealis, Latinized from π Coronae Borealis, is a solitary,[6] orange-hued star in the northern constellation of Corona Borealis. Its apparent magnitude is 5.58,[2] which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 13.40 mas as measured from Earth, it is located about 243 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −5 km/s.[3] It is most likely (98% chance) a member of the thin disk population.[7]
This is an evolved G-type giant star with a stellar classification of G9 III:, where the ':' indicates some uncertainty about the classification. (Bartkevicius and Lazauskaite (1997) classify it as K0 III.)[8] The star has 1.61[2] times the mass of the Sun and has expanded to about 10 times the Sun's radius. The abundance of iron is lower than in the Sun: the star is considered metal deficient.[8] It is around 4.6[2] billion years old and is radiating 39 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,667 K.[3]
^ abcdeCite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ abcdefgCite error: The named reference luck2015 was invoked but never defined (see the help page).
^ abcdeCite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
^Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^Cite error: The named reference Soubiran2008 was invoked but never defined (see the help page).
^ abCite error: The named reference Bartkevicius1997 was invoked but never defined (see the help page).
and 14 Related for: Pi Coronae Borealis information
magnitude 2.2 Alpha CoronaeBorealis. The yellow supergiant R CoronaeBorealis is the prototype of a rare class of giant stars—the R CoronaeBorealis variables—that...
letters): Aps for Apus/Apodis, CrA for Corona Australis, CrB for Corona Borealis, Crv for Corvus. (Crater is abbreviated Crt to prevent confusion with CrA...
6 magnitudes in 1992 and was identified as one of a rare class of stars—R CoronaeBorealis variables. Eclipsing variables are star systems that vary in brightness...
23 Alpha Cassiopeiae Star 2.230 Gamma Draconis Star 2.24 2.21 Alpha CoronaeBorealis Binary star system 2.25 2.24 Zeta Puppis Star 2.26 2.23 Iota Carinae...
inclination of their orbit is not known. Examples include HD 114762 b (>11.68 MJ), Pi Mensae b (>10.312 MJ), and NGC 2423-3 b (>10.6 MJ). Sorted by increasing right...
System of Rho CoronaeBorealis”, Ap J 548, L61. Gatewood, G., Han, I. & Black, D.C. 2001 “Hipparcos and MAP Studies of the Triple Star Pi Cephei”, ApJ...
themselves RCB – (celestial object) R CoronaeBorealis, a class of eruptive variable stars named after R CoronaeBorealis, the archetype for the class RDI...
Teff by the Stefan–Boltzmann law: L = 4 π σ R 2 T eff 4 {\displaystyle L=4\pi \sigma R^{2}T_{\text{eff}}^{4}} where σ is the Stefan–Boltzmann constant....
R_{\odot }} . From : R = L 4 π σ T e 4 {\displaystyle R={\sqrt {\frac {L}{4\pi \sigma {T_{e}}^{4}}}}} , where L {\displaystyle L} is the luminosity, R {\displaystyle...
176 0.6722 2002 HD 126614 Ab 0.422 1187.202 2.302 0.5869 2009 Kappa CoronaeBorealis b 1.790 1191.111 2.701 0.1924 2007 HD 23127 b 1.370 1214.151 2.320...
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