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Tau Sagittarii

Page history last edited by PBworks 13 years, 11 months ago

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


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



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



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)


Ref:Internet Stellar Database

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