21 Cas
21 Cas
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21 Cas is a A-type (White) star located in the constellation Cassiopeia. It carries the designation 21 Cas.
Located approximately 303.4 light-years from Earth, 21 Cas resides within the broader disk of our Milky Way galaxy.
21 Cas is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.
With an apparent magnitude of +5.64, 21 Cas 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 +0.078.
Физические свойства
| Спектральный класс | A Class A — A-type (White) |
| Показатель цвета (B−V) | 0,078 |
Наблюдение
| Видимая звёздная величина | +5.64 |
| Абсолютная звёздная величина | 0,80 |
| Расстояние | 303 ly |
| Созвездие | Cassiopeia |
Положение
| Прямое восхождение | 0h 45,65m |
| Склонение | 74° 59,28′ |