21 Sgr
21 Sgr
21 Sgr is a A-type (White) star located in the constellation Sagittarius. It carries the designation 21 Sgr.
Located approximately 410.3 light-years from Earth, 21 Sgr resides within the broader disk of our Milky Way galaxy.
21 Sgr is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of +4.81, 21 Sgr 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 orange hue, which corresponds to a B-V color index of +1.310.
物理特性
| 光谱类型 | A Class A — A-type (White) |
| 色指数 (B−V) | 1.310 |
观测
| 视星等 | +4.81 |
| 绝对星等 | -0.69 |
| 距离 | 410 ly |
| 星座 | Sagittarius |
位置
| 赤经 | 18h 25.35m |
| 赤纬 | -20° 32.50′ |
Frequently Asked Questions
What type of star is 21 Sgr?
21 Sgr is a Class A — A-type (White) star.
How far is 21 Sgr from Earth?
21 Sgr is approximately 410.3 light-years from Earth.
Can you see 21 Sgr with the naked eye?
With an apparent magnitude of 4.81, 21 Sgr is visible to the naked eye.
What constellation is 21 Sgr in?
21 Sgr is located in the constellation Sagittarius.