Astronomy
Constellations - Ophiuchus - 55alp Oph (Rasalhague)

 
Identification Data
Common NameRasalhague
ConstellationOphiuchus
Star Name55alp Oph
Skymap Number17340172
Henry Draper (HD) Number159561
Harvard Revised (HR) Number6556
SAO Number102932
Durchmusterung (DM) NumberBD+12 3252
Washington Double Stars (WDS) Number

Positional Data
Position and Proper Motion (PPM) Number133563
Right Ascension (RA) J200017h 34m 56.070s
Declination (Dec) J2000+12° 33' 36.125"
Position Uncertainty0.0119s
Proper Motion in RA (J2000)/cos(Dec)+0.00752
Proper Motion in Dec (J2000)-0.222666
Radial Velocity+012.6km s-1
Trigonometric Parallax+0.06984s
Trigonometric Parallax Uncertainty0.00088s
GCI Unit Vector in X (J2000)-0.106539
GCI Unit Vector in Y (J2000)-0.970237
GCI Unit Vector in Z (J2000)0.217462
Galactic Longitude35.90°
Galactic Latitude
22.57°
Observational Data
Observed Visual Magnitude (V)2.09
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.003
Observed B Magnitude2.28
Observed B-V Colour+0.190
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 Magnitude2.1
Observed Photographic Magnitude
Morgan Keenan (MK) Spectral TypeA5III
One-Dimensional Spectral ClassA5
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 13:15:46 GMT+01:00 2001