Aktuell position
| Egenskap | Värde |
|---|---|
| Right Ascension (J2000) | 17h10m22s |
| Declination (J2000) | -15°43'27" |
| Altitude | 32.68° |
| Azimuth | 196.96° |
| Hour Angle | 01h00m41s |
| Constellation | Ophiuchus |
| Visibility | naked_eye |
Fysiska egenskaper
| Egenskap | Värde |
|---|---|
| Visual Magnitude | 2.43 |
| Spectral Class | A5III |
| Color Index (B-V) | 0.15 |
| Distance | 48.6 light-years |
| Parallax | 38.77 mas |
| Proper Motion (RA) | 41.16 mas/yr |
| Proper Motion (Dec) | 97.65 mas/yr |
| Radial Velocity | 12.6 km/s |
Katalogbeteckningar
| Katalog | Beteckning |
|---|---|
| Hipparcos (HIP) | 84012 |
| Bright Star Catalogue (HR) | 6556 |
| Henry Draper (HD) | 159561 |
| SAO | 123129 |
| Bayer Designation | α Oph |
| Flamsteed Designation | 55 Oph |
Uppgång, nedgång och kulmination
| Händelse | Tid / Värde |
|---|---|
| Rise Time | 19:49 |
| Transit Time | 01:01 (altitude: 34.4°) |
| Set Time | 06:09 |