Astronomy
Constellations - Hydra - 7eta Hya

 
Identification Data
Common Name
ConstellationHydra
Star Name7eta Hya
Skymap Number8430053
Henry Draper (HD) Number74280
Harvard Revised (HR) Number3454
SAO Number117050
Durchmusterung (DM) NumberBD+03 2039
Washington Double Stars (WDS) Number

Positional Data
Position and Proper Motion (PPM) Number154889
Right Ascension (RA) J20008h 43m 13.475s
Declination (Dec) J2000+3° 23' 55.184"
Position Uncertainty0.0107s
Proper Motion in RA (J2000)/cos(Dec)-0.00128
Proper Motion in Dec (J2000)-0.001366
Radial Velocity+016.8km s-1
Trigonometric Parallax+0.00699s
Trigonometric Parallax Uncertainty0.00092s
GCI Unit Vector in X (J2000)-0.652352
GCI Unit Vector in Y (J2000)0.755594
GCI Unit Vector in Z (J2000)0.059283
Galactic Longitude223.26°
Galactic Latitude
26.32°
Observational Data
Observed Visual Magnitude (V)4.29
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.003
Observed B Magnitude4.11
Observed B-V Colour-0.179
Observed B Magnitude or (B-V) Magnitude Uncertainty0.004
Observed U Magnitude
Observed U-B Colour
Observed U Magnitude or (U-B) Magnitude Uncertainty
Observed Photovisual Magnitude4.3
Observed Photographic Magnitude4.0
Morgan Keenan (MK) Spectral TypeB3V
One-Dimensional Spectral ClassB3
Position Angle
Year of Observation 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