Astronomy
Constellations - Hydra - 30alp Hya (Alphard)

 
Identification Data
Common NameAlphard
ConstellationHydra
Star Name30alp Hya
Skymap Number9270098
Henry Draper (HD) Number81797
Harvard Revised (HR) Number3748
SAO Number136871
Durchmusterung (DM) NumberSD-08 2680
Washington Double Stars (WDS) Number
09276-0840
Positional Data
Position and Proper Motion (PPM) Number192393
Right Ascension (RA) J20009h 27m 35.243s
Declination (Dec) J2000-8° 39' 30.969"
Position Uncertainty0.0096s
Proper Motion in RA (J2000)/cos(Dec)-0.00098
Proper Motion in Dec (J2000)+0.033366
Radial Velocity-004.4km s-1
Trigonometric Parallax+0.01840s
Trigonometric Parallax Uncertainty0.00078s
GCI Unit Vector in X (J2000)-0.777933
GCI Unit Vector in Y (J2000)0.610046
GCI Unit Vector in Z (J2000)-0.150547
Galactic Longitude241.50°
Galactic Latitude
29.05°
Observational Data
Observed Visual Magnitude (V)1.99
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.004
Observed B Magnitude3.44
Observed B-V Colour+1.453
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 Magnitude2.2
Observed Photographic Magnitude3.2
Morgan Keenan (MK) Spectral TypeK3II-III
One-Dimensional Spectral ClassK2
Position Angle153
Year of Observation1899. 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