Identification Data |
Common Name | Alnilam |
Constellation | Orion |
Star Name | 46eps Ori |
Skymap Number | 5360046 |
Henry Draper (HD) Number | 37128 |
Harvard Revised (HR) Number | 1903 |
SAO Number | 132346 |
Durchmusterung (DM) Number | BD-01 969 |
Washington Double Stars (WDS) Number
| 05362-0112
|
Positional Data |
Position and Proper Motion (PPM) Number | 175945 |
Right Ascension (RA) J2000 | 5h 36m 12.813s |
Declination (Dec) J2000 | -1° 12' 6.911" |
Position Uncertainty | 0.0080s |
Proper Motion in RA (J2000)/cos(Dec) | +0.00010 |
Proper Motion in Dec (J2000) | -0.001166 |
Radial Velocity | +025.9km s-1 |
Trigonometric Parallax | +0.00243s |
Trigonometric Parallax Uncertainty | 0.00091s |
GCI Unit Vector in X (J2000) | 0.103579 |
GCI Unit Vector in Y (J2000) | 0.994400 |
GCI Unit Vector in Z (J2000) | -0.020976 |
Galactic Longitude | 205.22° |
Galactic Latitude
| -17.24°
|
Observational Data |
Observed Visual Magnitude (V) | 1.72 |
Derived Visual Magnitude | |
Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.005 |
Observed B Magnitude | 1.60 |
Observed B-V Colour | -0.123 |
Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.007 |
Observed U Magnitude | |
Observed U-B Colour | |
Observed U Magnitude or (U-B) Magnitude Uncertainty | |
Observed Photovisual Magnitude | 1.8 |
Observed Photographic Magnitude | |
Morgan Keenan (MK) Spectral Type | B0Ia |
One-Dimensional Spectral Class | B0 |
Position Angle | 57 |
Year of Observation | 1907. AD |