Astronomy
Constellations - Perseus - 21 Per

 
Identification Data
Common Name
ConstellationPerseus
Star Name21 Per
Skymap Number2570048
Henry Draper (HD) Number18296
Harvard Revised (HR) Number873
SAO Number56031
Durchmusterung (DM) NumberBD+31 509
Washington Double Stars (WDS) Number

Positional Data
Position and Proper Motion (PPM) Number67948
Right Ascension (RA) J20002h 57m 17.282s
Declination (Dec) J2000+31° 56' 3.187"
Position Uncertainty0.0094s
Proper Motion in RA (J2000)/cos(Dec)+0.00024
Proper Motion in Dec (J2000)-0.031166
Radial Velocity+007.7km s-1
Trigonometric Parallax+0.00843s
Trigonometric Parallax Uncertainty0.00090s
GCI Unit Vector in X (J2000)0.607149
GCI Unit Vector in Y (J2000)0.592948
GCI Unit Vector in Z (J2000)0.528945
Galactic Longitude151.89°
Galactic Latitude
-23.77°
Observational Data
Observed Visual Magnitude (V)5.10
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.004
Observed B Magnitude5.09
Observed B-V Colour-0.013
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 Magnitude5.2
Observed Photographic Magnitude
Morgan Keenan (MK) Spectral TypeB9pSi
One-Dimensional Spectral ClassA0
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 13:15:47 GMT+01:00 2001