Sigma Coronae Borealis
Star in the constellation Corona Borealis / From Wikipedia, the free encyclopedia
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Not to be confused with S Coronae Borealis.
Sigma Coronae Borealis (σ CrB) is a star system in the constellation of Corona Borealis. It is a quintuple star system containing three sunlike main-sequence stars and two other low-mass stars. The combined visual magnitude is 5.3 and the system lies 74 light years from Earth. σ CrB A is the variable star TZ Coronae Borealis.
Quick Facts Apparent magnitude (V), Characteristics ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corona Borealis |
σ CrB A (σ2) | |
Right ascension | 16h 14m 40.854s[2] |
Declination | +33° 51′ 31.02″[2] |
Apparent magnitude (V) | 5.55[2] |
σ CrB B (σ1) | |
Right ascension | 16h 14m 40.394s[2] |
Declination | +33° 51′ 27.05″[2] |
Apparent magnitude (V) | 6.419[2] |
σ CrB C | |
Right ascension | 16h 13m 56.26666s[3] |
Declination | +33° 46′ 24.2953″[3] |
Apparent magnitude (V) | 12.229[4] |
Characteristics | |
σ CrB | |
Spectral type | F6V (A)[5] + G1V (B)[6] |
U−B color index | +0.045[7] |
B−V color index | +0.599[7] |
Variable type | RS CVn[8] |
σ CrB C | |
Spectral type | M2.5V[9] |
Astrometry | |
σ CrB A | |
Radial velocity (Rv) | −12.30 ± 0.06[10] km/s |
Proper motion (μ) | RA: −268.325[11] mas/yr Dec.: −86.925[11] mas/yr |
Parallax (π) | 44.1346 ± 0.0644 mas[11] |
Distance | 73.9 ± 0.1 ly (22.66 ± 0.03 pc) |
σ CrB B | |
Radial velocity (Rv) | −12.30 ± 0.06[10] km/s |
Proper motion (μ) | RA: −291.118[12] mas/yr Dec.: −78.651[12] mas/yr |
Parallax (π) | 44.1475 ± 0.0237 mas[12] |
Distance | 73.88 ± 0.04 ly (22.65 ± 0.01 pc) |
σ CrB C | |
Radial velocity (Rv) | −16.30 ± 10[13] km/s |
Proper motion (μ) | RA: −265.92[3] mas/yr Dec.: −83.63[3] mas/yr |
Parallax (π) | 42.8557 ± 0.3965 mas[14] |
Distance | 76.1 ± 0.7 ly (23.3 ± 0.2 pc) |
Orbit[15] | |
Primary | σ2 CrB primary |
Companion | σ2 CrB secondary |
Period (P) | 1.139791423(80) |
Semi-major axis (a) | 1.225 ± 0.013 mas |
Eccentricity (e) | 0.0 |
Inclination (i) | 28.08 ± 0.34° |
Longitude of the node (Ω) | 207.93 ± 0.67° |
Periastron epoch (T) | Tnode = 2450127.04855(20) |
Argument of periastron (ω) (secondary) | 0.0° |
Orbit[15] | |
Primary | σ2 CrB |
Companion | σ1 CrB |
Period (P) | 726 ± 62 yr |
Semi-major axis (a) | 5.26 ± 0.35″ |
Eccentricity (e) | 0.72 ± 0.01 |
Inclination (i) | 32.3 ± 4.1° |
Longitude of the node (Ω) | 28.0 ± 0.5° |
Periastron epoch (T) | B 1825.2 ± 1.5 |
Argument of periastron (ω) (primary) | 237.3 ± 6.8° |
Orbit[16] | |
Primary | σ CrB Ca |
Companion | σ CrB Cb |
Period (P) | 52 yr |
Semi-major axis (a) | 0.111″ |
Eccentricity (e) | 0.36 |
Inclination (i) | 59° |
Longitude of the node (Ω) | 30° |
Periastron epoch (T) | B 1963.0 |
Argument of periastron (ω) (secondary) | 127° |
Details | |
σ1 CrB | |
Mass | 1.0[15] M☉ |
Surface gravity (log g) | 4.5[15] cgs |
Temperature | 5950 ± 100[15] K |
Rotational velocity (v sin i) | 3 ± 2[15] km/s |
Age | 1 to 3[15] Myr |
σ2 CrB primary | |
Mass | 1.137 ± 0.037[15] M☉ |
Radius | 1.244 ± 0.050[15] R☉ |
Surface gravity (log g) | 4.5[15] cgs |
Temperature | 6050 ± 150[15] K |
Metallicity [Fe/H] | 0.0[15] dex |
Rotational velocity (v sin i) | 26 ± 1[15] km/s |
Age | 0.5 to 1.5[15] Gyr |
σ2 CrB secondary | |
Mass | 1.090 ± 0.036[15] M☉ |
Radius | 1.244 ± 0.050[15] R☉ |
Surface gravity (log g) | 4.5[15] cgs |
Temperature | 5870 ± 150[15] K |
Metallicity [Fe/H] | 0.0[15] dex |
Rotational velocity (v sin i) | 26 ± 1[15] km/s |
Age | 0.5 to 1.5[15] Gyr |
σ CrB C | |
Mass | 0.423 ± 0.042[17] M☉ |
Radius | 0.437 ± 0.020[17] R☉ |
Surface gravity (log g) | 5.0[18] cgs |
Temperature | 3454 ± 63[17] K |
Metallicity [Fe/H] | −0.06 ± 0.03[17] dex |
Age | 2.95[17] Gyr |
Other designations | |
σ CrB A: σ2 CrB, TZ CrB, GJ 9550B, HD 146361, HR 6064, CCDM J16147+3352A, WDS J16147+3352A, TYC 2583-1846-1[19] | |
σ CrB B: σ1 CrB, GJ 9550A, HD 146362, HR 6063, CCDM J16147+3352B, WDS J16147+3352B, TYC 2583-1846-2[20] | |
σ CrB C: GJ 9549, HIP 79551, WDS J16147+3352E, G 180-42[21] | |
Database references | |
SIMBAD | σ CrB |
σ1 CrB | |
σ2 CrB | |
σ CrB C | |
ARICNS | σ1 CrB |
σ2 CrB | |
σ CrB C |
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