Astronomy
Constellations - Saggitarius - 21 Sgr

 
Identification Data
Common Name
ConstellationSaggitarius
Star Name21 Sgr
Skymap Number18250081
Henry Draper (HD) Number169420
Harvard Revised (HR) Number6896
SAO Number186794
Durchmusterung (DM) NumberSD-20 5134
Washington Double Stars (WDS) Number
18254-2033
Positional Data
Position and Proper Motion (PPM) Number268387
Right Ascension (RA) J200018h 25m 21.040s
Declination (Dec) J2000-20° 32' 30.044"
Position Uncertainty0.0196s
Proper Motion in RA (J2000)/cos(Dec)+0.00059
Proper Motion in Dec (J2000)-0.028767
Radial Velocity-011.8km s-1
Trigonometric Parallax+0.00546s
Trigonometric Parallax Uncertainty0.00120s
GCI Unit Vector in X (J2000)0.103369
GCI Unit Vector in Y (J2000)-0.930694
GCI Unit Vector in Z (J2000)-0.350889
Galactic Longitude11.74°
Galactic Latitude
-3.75°
Observational Data
Observed Visual Magnitude (V)4.86
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.007
Observed B Magnitude6.20
Observed B-V Colour+1.338
Observed B Magnitude or (B-V) Magnitude Uncertainty0.024
Observed U Magnitude
Observed U-B Colour
Observed U Magnitude or (U-B) Magnitude Uncertainty
Observed Photovisual Magnitude5.1
Observed Photographic Magnitude
Morgan Keenan (MK) Spectral TypeK2II
One-Dimensional Spectral ClassK0
Position Angle287
Year of Observation1982. 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 13:15:50 GMT+01:00 2001