18 UMa
18 UMa
18 UMa is a A-type (White) star located in the constellation Ursa Major. It carries the designation 18 UMa.
Located approximately 116.9 light-years from Earth, 18 UMa resides within the broader disk of our Milky Way galaxy.
18 UMa is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of +4.80, 18 UMa sits near the limit of naked-eye visibility. It can be glimpsed without optical aid under dark skies, but binoculars will make observation much easier. Observers will note its blue-white hue, which corresponds to a B-V color index of +0.199.
Propriétés physiques
| Classe Spectrale | A Class A — A-type (White) |
| Indice de couleur (B−V) | 0,199 |
Observation
| Magnitude Apparente | +4.80 |
| Magnitude Absolue | 2,03 |
| Distance | 117 ly |
| Constellation | Ursa Major |
Position
| Ascension droite | 9h 16,19m |
| Déclinaison | 54° 1,31′ |
Frequently Asked Questions
What type of star is 18 UMa?
18 UMa is a Class A — A-type (White) star.
How far is 18 UMa from Earth?
18 UMa is approximately 116.9 light-years from Earth.
Can you see 18 UMa with the naked eye?
With an apparent magnitude of 4.80, 18 UMa is visible to the naked eye.
What constellation is 18 UMa in?
18 UMa is located in the constellation Ursa Major.