Astronomy
Constellations - Boötes - 21iot Boo (Asellus Secondus)

 
Identification Data
Common NameAsellus Secondus
ConstellationBoötes
Star Name21iot Boo
Skymap Number14160031
Henry Draper (HD) Number125161
Harvard Revised (HR) Number5350
SAO Number29071
Durchmusterung (DM) NumberBD+52 1784
Washington Double Stars (WDS) Number
14162+5122
Positional Data
Position and Proper Motion (PPM) Number34432
Right Ascension (RA) J200014h 16m 9.929s
Declination (Dec) J2000+51° 22' 2.033"
Position Uncertainty0.0064s
Proper Motion in RA (J2000)/cos(Dec)-0.01602
Proper Motion in Dec (J2000)+0.089466
Radial Velocity-018.7km s-1
Trigonometric Parallax+0.03354s
Trigonometric Parallax Uncertainty0.00056s
GCI Unit Vector in X (J2000)-0.517338
GCI Unit Vector in Y (J2000)-0.349493
GCI Unit Vector in Z (J2000)0.781164
Galactic Longitude95.22°
Galactic Latitude
60.96°
Observational Data
Observed Visual Magnitude (V)4.75
Derived Visual Magnitude
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty0.002
Observed B Magnitude4.98
Observed B-V Colour+0.227
Observed B Magnitude or (B-V) Magnitude Uncertainty0.003
Observed U Magnitude
Observed U-B Colour
Observed U Magnitude or (U-B) Magnitude Uncertainty
Observed Photovisual Magnitude4.8
Observed Photographic Magnitude
Morgan Keenan (MK) Spectral TypeA9V
One-Dimensional Spectral ClassA5
Position Angle33
Year of Observation1964. 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 13:15:34 GMT+01:00 2001