21 Her
21 Her
21 Her is a A-type (White) star located in the constellation Hercules. It carries the designation 21 Her.
Located approximately 366.5 light-years from Earth, 21 Her resides within the broader disk of our Milky Way galaxy.
21 Her is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of +5.83, 21 Her 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 +0.018.
Propriedades físicas
| Classe Espectral | A Class A — A-type (White) |
| Índice de cor (B−V) | 0,018 |
Observação
| Magnitude Aparente | +5.83 |
| Magnitude Absoluta | 0,58 |
| Distância | 366 ly |
| Constelação | Hercules |
Posição
| Ascensão reta | 16h 24,18m |
| Declinação | 6° 56,89′ |
Frequently Asked Questions
What type of star is 21 Her?
21 Her is a Class A — A-type (White) star.
How far is 21 Her from Earth?
21 Her is approximately 366.5 light-years from Earth.
Can you see 21 Her with the naked eye?
With an apparent magnitude of 5.83, 21 Her is visible to the naked eye.
What constellation is 21 Her in?
21 Her is located in the constellation Hercules.