Rasalhague
55Alp Oph
Rasalhague is a A-type (White) star. It carries the designation 55Alp Oph.
Rasalhague lies approximately 48.6 light-years from Earth, placing it within the Sun's local stellar neighborhood. This relatively short cosmic distance means the light reaching us today departed the star only about 48 years ago.
Rasalhague is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
At an apparent magnitude of +2.08, Rasalhague is visible to the naked eye under reasonably clear skies. It may require dark-sky conditions to be seen comfortably in areas with significant light pollution. Observers will note its blue-white hue, which corresponds to a B-V color index of +0.155.
Physical Properties
| Spectral Class | A Class A — A-type (White) |
| Color Index (B−V) | 0.155 |
Observation
| Apparent Magnitude | +2.08 |
| Absolute Magnitude | 1.22 |
| Distance | 48.6 ly |
Position
| Right Ascension | 17h 34.93m |
| Declination | 12° 33.60′ |
Frequently Asked Questions
What type of star is Rasalhague?
Rasalhague is a Class A — A-type (White) star.
How far is Rasalhague from Earth?
Rasalhague is approximately 48.6 light-years from Earth.
Can you see Rasalhague with the naked eye?
With an apparent magnitude of 2.08, Rasalhague is visible to the naked eye.