Astronomy
Constellations - Canis Major - 31eta CMa (Aludra)

 
Identification Data
Common NameAludra
ConstellationCanis Major
Star Name31eta CMa
Skymap Number7240025
Henry Draper (HD) Number58350
Harvard Revised (HR) Number2827
SAO Number173651
Durchmusterung (DM) NumberCD-29 4328
Washington Double Stars (WDS) Number
07241-2918
Positional Data
Position and Proper Motion (PPM) Number252311
Right Ascension (RA) J20007h 24m 5.702s
Declination (Dec) J2000-29° 18' 11.173"
Position Uncertainty0.0065s
Proper Motion in RA (J2000)/cos(Dec)-0.00029
Proper Motion in Dec (J2000)+0.006766
Radial Velocity+041.1km s-1
Trigonometric Parallax+0.00102s
Trigonometric Parallax Uncertainty0.00057s
GCI Unit Vector in X (J2000)-0.312850
GCI Unit Vector in Y (J2000)0.813992
GCI Unit Vector in Z (J2000)-0.489430
Galactic Longitude242.62°
Galactic Latitude
-6.49°
Observational Data
Observed Visual Magnitude (V)2.46
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.003
Observed B Magnitude2.41
Observed B-V Colour-0.048
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 Magnitude2.4
Observed Photographic Magnitude2.3
Morgan Keenan (MK) Spectral TypeB5Ia
One-Dimensional Spectral ClassB5
Position Angle285
Year of Observation1909. 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 13:15:35 GMT+01:00 2001