Astronomy
Constellations - Grus - alp Gru (Alnair)

 
Identification Data
Common NameAlnair
ConstellationGrus
Star Namealp Gru
Skymap Number22080038
Henry Draper (HD) Number209952
Harvard Revised (HR) Number8425
SAO Number230992
Durchmusterung (DM) NumberCD-4714063
Washington Double Stars (WDS) Number
22082-4658
Positional Data
Position and Proper Motion (PPM) Number327928
Right Ascension (RA) J200022h 8m 13.985s
Declination (Dec) J2000-46° 57' 39.512"
Position Uncertainty0.0059s
Proper Motion in RA (J2000)/cos(Dec)+0.01246
Proper Motion in Dec (J2000)-0.147966
Radial Velocity+010.9km s-1
Trigonometric Parallax+0.03216s
Trigonometric Parallax Uncertainty0.00082s
GCI Unit Vector in X (J2000)0.602934
GCI Unit Vector in Y (J2000)-0.319800
GCI Unit Vector in Z (J2000)-0.730889
Galactic Longitude350.01°
Galactic Latitude
-52.47°
Observational Data
Observed Visual Magnitude (V)1.77
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.004
Observed B Magnitude1.70
Observed B-V Colour-0.073
Observed B Magnitude or (B-V) Magnitude Uncertainty0.005
Observed U Magnitude
Observed U-B Colour
Observed U Magnitude or (U-B) Magnitude Uncertainty
Observed Photovisual Magnitude2.2
Observed Photographic Magnitude2.0
Morgan Keenan (MK) Spectral TypeB7IV
One-Dimensional Spectral ClassB5
Position Angle149
Year of Observation1947. 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 13:15:41 GMT+01:00 2001