Tau Sagittarii
aka 40 Sagitarii, HR 7234, HD 177716, SAO 187683, HIP 93864
| Possible source of the 1977 Wow Signal. |
Image: Tau Sagittarii compared to the sun.
Star Data
Statistics
Light Orange Giant star
Spectral Type: K1
Luminosity Class: III
Color indices: B-V= +1.19, U-B= +1.15
Visual Magnitude: 3.32
Absolute Magnitude: 0.48
Magnitude Ranking: 241th
Location
Equatorial Coord: 19h 07m - 27.7˚ (R.A./Declination - epoch 2000)
Galactic Coord: 9.3 -15.4 (long/lat)
Celestial (X,Y,Z) coordinates in ly: 30.7, -102, -55.9
Galactic (X,Y,Z) coordinates in ly: 114, 19.5, -33.1
Hipparcos parallax: 27.09 milli-arcseconds
Parallax Error: 1.48 milli-arcseconds
Proper motion: 0.255 arcsec/yr (192.0° from north)
Radial Velocity: 45.4 km/sec
Galactic (U,V,W) velocity components in km/s: 48.1, -36.2, -20.7
Characteristics
190% Solar Diameter
?% Solar Mass
559% Solar Luminosity
Surface Temperature: ~4000K
Comfort Zone: 7.48 AU
Age: ? Billion Years
Distance from Earth: 120 light years (36.9 parsecs)