| Identification Data |
| Common Name |
Rasalhague |
| Constellation |
Ophiuchus |
| Star Name |
55alp Oph |
| Skymap Number |
17340172 |
| Henry Draper (HD) Number |
159561 |
| Harvard Revised (HR) Number |
6556 |
| SAO Number |
102932 |
| Durchmusterung (DM) Number |
BD+12 3252 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number |
133563 |
| Right Ascension (RA) J2000 |
17h 34m 56.070s |
| Declination (Dec) J2000 |
+12° 33' 36.125" |
| Position Uncertainty |
0.0119s |
| Proper Motion in RA (J2000)/cos(Dec) |
+0.00752 |
| Proper Motion in Dec (J2000) |
-0.222666 |
| Radial Velocity |
+012.6km s-1 |
| Trigonometric Parallax |
+0.06984s |
| Trigonometric Parallax Uncertainty |
0.00088s |
| GCI Unit Vector in X (J2000) |
-0.106539 |
| GCI Unit Vector in Y (J2000) |
-0.970237 |
| GCI Unit Vector in Z (J2000) |
0.217462 |
| Galactic Longitude |
35.90° |
Galactic Latitude
|
22.57°
|
| Observational Data |
| Observed Visual Magnitude (V) |
2.09 |
| Derived Visual Magnitude |
|
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty |
0.003 |
| Observed B Magnitude |
2.28 |
| Observed B-V Colour |
+0.190 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty |
0.004 |
| Observed U Magnitude |
|
| Observed U-B Colour |
|
| Observed U Magnitude or (U-B) Magnitude Uncertainty |
|
| Observed Photovisual Magnitude |
2.1 |
| Observed Photographic Magnitude |
|
| Morgan Keenan (MK) Spectral Type |
A5III |
| One-Dimensional Spectral Class |
A5 |
| Position Angle |
|
| Year of Observation |
AD |
