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Gamma Reticuli
Variable star in the constellation Reticulum / From Wikipedia, the free encyclopedia
Gamma Reticuli (Gamma Ret, γ Reticuli, γ Ret) is a solitary[10] star in the southern constellation of Reticulum. With an apparent visual magnitude of 4.5,[2] it can be faintly seen with the naked eye. Based upon an annual parallax shift of 6.95 mas,[1] it is located roughly 469 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[5]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/GammaRetLightCurve.png/640px-GammaRetLightCurve.png)
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Reticulum |
Right ascension | 04h 00m 53.80860s[1] |
Declination | −62° 09′ 33.4250″[1] |
Apparent magnitude (V) | 4.5[2] |
Characteristics | |
Evolutionary stage | asymptotic giant branch[3] |
Spectral type | M4 III[4] |
U−B color index | +1.81[2] |
B−V color index | +1.66[2] |
Variable type | SR[5] |
Astrometry | |
Radial velocity (Rv) | −7.0±2.7[6] km/s |
Proper motion (μ) | RA: +3.03[1] mas/yr Dec.: +34.67[1] mas/yr |
Parallax (π) | 6.95 ± 0.11 mas[1] |
Distance | 469 ± 7 ly (144 ± 2 pc) |
Absolute magnitude (MV) | −1.31[7] |
Details | |
Mass | 1.5−2[5] M☉ |
Radius | 115[5] R☉ |
Luminosity | 1,846[8] L☉ |
Surface gravity (log g) | 0.8[5] cgs |
Temperature | 3,599[8] K |
Metallicity [Fe/H] | 0.0[5] dex |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved red giant star, currently on the asymptotic giant branch,[3] with a stellar classification of M4 III.[4] It is a semiregular variable with a period of 25 days.[5] Gamma Reticuli has 1.5−2 times the mass of the Sun, 115 times the Sun's radius,[5] and radiates 1,846 times the solar luminosity from its outer atmosphere at an effective temperature of 3,450 K.[8]
Gamma Reticuli is moving through the Galaxy at a speed of 24.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,100 and 39,200 light years from the center of the Galaxy.[12]