当前位置
| 属性 | 数值 |
|---|---|
| Right Ascension (J2000) | 20h41m25s |
| Declination (J2000) | +45°16'49" |
| Altitude | 69.76° |
| Azimuth | 65.57° |
| Hour Angle | -1h14m21s |
| Constellation | Cygnus |
| Visibility | naked_eye |
物理属性
| 属性 | 数值 |
|---|---|
| Visual Magnitude | 1.25 |
| Spectral Class | A2Ia |
| Color Index (B-V) | 0.09 |
| Distance | 2615.0 light-years |
| Parallax | 1.01 mas |
| Proper Motion (RA) | 1.56 mas/yr |
| Proper Motion (Dec) | 1.55 mas/yr |
| Radial Velocity | -4.6 km/s |
目录编号
| 目录 | 编号 |
|---|---|
| Hipparcos (HIP) | 102098 |
| Bright Star Catalogue (HR) | 7924 |
| Henry Draper (HD) | 197345 |
| SAO | 49941 |
| Bayer Designation | α Cyg |
| Flamsteed Designation | 50 Cyg |
升起、落下和中天
| 天象 | 时间/数值 |
|---|---|
| Rise Time | 18:29 |
| Transit Time | 04:31 (altitude: 84.5°) |
| Set Time | 14:29 |