Astronomy
Constellations - Hydra - 31tau1Hya

 
Identification Data
Common Name
ConstellationHydra
Star Name31tau1Hya
Skymap Number9290031
Henry Draper (HD) Number81997
Harvard Revised (HR) Number3759
SAO Number136895
Durchmusterung (DM) NumberSD-02 2901
Washington Double Stars (WDS) Number
09291-0246
Positional Data
Position and Proper Motion (PPM) Number177880
Right Ascension (RA) J20009h 29m 8.897s
Declination (Dec) J2000-2° 46' 8.270"
Position Uncertainty0.0420s
Proper Motion in RA (J2000)/cos(Dec)+0.00674
Proper Motion in Dec (J2000)-0.003266
Radial Velocity+098.0km s-1
Trigonometric Parallax+0.05848s
Trigonometric Parallax Uncertainty0.00380s
GCI Unit Vector in X (J2000)-0.790162
GCI Unit Vector in Y (J2000)0.610991
GCI Unit Vector in Z (J2000)-0.048309
Galactic Longitude236.24°
Galactic Latitude
32.86°
Observational Data
Observed Visual Magnitude (V)4.92
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.006
Observed B Magnitude
Observed B-V Colour
Observed B Magnitude or (B-V) Magnitude Uncertainty
Observed U Magnitude
Observed U-B Colour
Observed U Magnitude or (U-B) Magnitude Uncertainty
Observed Photovisual Magnitude4.8
Observed Photographic Magnitude4.8
Morgan Keenan (MK) Spectral TypeF6V
One-Dimensional Spectral ClassF5
Position Angle3
Year of Observation1935. AD

Data Source
SKY2000 - Master Star Catalog - Star Catalog Database, Version 2
    Sande C.B., Warren Jr. W.H., Tracewell D.A., Home A.T., Miller A.C.
    (Goddard Space Flight Center, Flight Dynamics Division (1998))

 
Page compiled: Sun Sep 02 13:15:42 GMT+01:00 2001