Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 22h 15m 36.93338s [1] |
Declination | −41° 20′ 48.3558″ [1] |
Apparent magnitude (V) | 4.79 [2] (5.20 + 6.68) [3] |
Characteristics | |
Spectral type | G8 III + G [4] |
U−B color index | +0.47 [2] |
B−V color index | +0.80 [2] |
Astrometry | |
Radial velocity (Rv) | −4.82±1.54 [1] km/s |
Proper motion (μ) |
RA: +30.774
[1]
mas/
yr Dec.: +42.645 [1] mas/ yr |
Parallax (π) | 13.5115 ± 0.2846 mas [1] |
Distance | 241 ± 5
ly (74 ± 2 pc) |
Absolute magnitude (MV) | +0.17 [5] |
Orbit [6] | |
Period (P) | 19.04+0.16 −0.18 yr |
Semi-major axis (a) | 0.168+0.003 −0.002″ |
Eccentricity (e) | 0.561+0.025 −0.020 |
Inclination (i) | 65.69+0.44 −0.53° |
Longitude of the node (Ω) | 104.2+1.6 −1.8° |
Periastron epoch (T) | 1996.35+0.17 −0.18 |
Argument of periastron (ω) (secondary) | 92.61+0.67 −0.54° |
Details | |
A | |
Radius | 9.3+1.4 −1.3 [1] R☉ |
Luminosity | 66.9+1.8 −1.6 [1] L☉ |
Temperature | 5,422+423 −377 [1] K |
Other designations | |
Database references | |
SIMBAD | data |
Mu1 Gruis, Latinized from μ1 Gruis, is a binary star [3] system in the southern constellation of Grus. It is visible to the naked eye with a combined apparent visual magnitude of 4.79. [2] The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth, [8] is around 275 light years. It is drifting closer with a heliocentric radial velocity of −5 km/s. [1]
The pair orbit each other with a period of 19 years and an eccentricity of 0.56. [6] The yellow-hued primary component is an evolved giant star with stellar classification of G III [4] and visual magnitude 5.20. [3] With the supply of hydrogen at its core exhausted, it cooled and expanded; at present it has nine [1] times the girth of the Sun. The star is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,422 K. [1]
The secondary component is magnitude 6.68 and classed as a G-type star, [3] although its color index and absolute magnitude suggest it is of type A6. [6]
{{
cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 22h 15m 36.93338s [1] |
Declination | −41° 20′ 48.3558″ [1] |
Apparent magnitude (V) | 4.79 [2] (5.20 + 6.68) [3] |
Characteristics | |
Spectral type | G8 III + G [4] |
U−B color index | +0.47 [2] |
B−V color index | +0.80 [2] |
Astrometry | |
Radial velocity (Rv) | −4.82±1.54 [1] km/s |
Proper motion (μ) |
RA: +30.774
[1]
mas/
yr Dec.: +42.645 [1] mas/ yr |
Parallax (π) | 13.5115 ± 0.2846 mas [1] |
Distance | 241 ± 5
ly (74 ± 2 pc) |
Absolute magnitude (MV) | +0.17 [5] |
Orbit [6] | |
Period (P) | 19.04+0.16 −0.18 yr |
Semi-major axis (a) | 0.168+0.003 −0.002″ |
Eccentricity (e) | 0.561+0.025 −0.020 |
Inclination (i) | 65.69+0.44 −0.53° |
Longitude of the node (Ω) | 104.2+1.6 −1.8° |
Periastron epoch (T) | 1996.35+0.17 −0.18 |
Argument of periastron (ω) (secondary) | 92.61+0.67 −0.54° |
Details | |
A | |
Radius | 9.3+1.4 −1.3 [1] R☉ |
Luminosity | 66.9+1.8 −1.6 [1] L☉ |
Temperature | 5,422+423 −377 [1] K |
Other designations | |
Database references | |
SIMBAD | data |
Mu1 Gruis, Latinized from μ1 Gruis, is a binary star [3] system in the southern constellation of Grus. It is visible to the naked eye with a combined apparent visual magnitude of 4.79. [2] The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth, [8] is around 275 light years. It is drifting closer with a heliocentric radial velocity of −5 km/s. [1]
The pair orbit each other with a period of 19 years and an eccentricity of 0.56. [6] The yellow-hued primary component is an evolved giant star with stellar classification of G III [4] and visual magnitude 5.20. [3] With the supply of hydrogen at its core exhausted, it cooled and expanded; at present it has nine [1] times the girth of the Sun. The star is radiating 67 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,422 K. [1]
The secondary component is magnitude 6.68 and classed as a G-type star, [3] although its color index and absolute magnitude suggest it is of type A6. [6]
{{
cite web}}
: CS1 maint: postscript (
link)