17 Lyrae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 07m 25.5807s 19h 07m 24.8s |
| Declination | +32° 30′ 6.258″ +32° 30′ 06″ |
| Apparent magnitude (V) | 5.229 / 9.1 |
| Characteristics | |
| Spectral type | F0V / ? |
| U−B color index | +0.05 / ? |
| B−V color index | +0.38 / ? |
| Astrometry | |
| Radial velocity (Rv) | 4.0 / -12.88 km/s |
| Proper motion (μ) | RA: 123.23 / ? mas/yr Dec.: 32.08 / ? mas/yr |
| Parallax (π) | 24.64 ± 0.54 mas |
| Distance | 132 ± 3 ly (40.6 ± 0.9 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
17 Lyrae is a binary star system in the constellation Lyra, approximately 132 light years away from Earth. The main star, 17 Lyrae A, is a 5th magnitude white star of the spectral type F0V, meaning it has a surface temperature of about 7,500 kelvins. It is a dwarf star, like the Sun, yet brighter and hotter.[1] Its companion, 17 Lyrae B, is a 9th magnitude star of an unknown spectral type.[2] There was once thought to be a third star in the system, 17 Lyrae C, until it was evident that the star's parallax and proper motions were too different for it to be part of the system.[3]
See also
- Gliese 747AB
References
- 1 2 "Simbad Query Result". Simbad. Retrieved October 15, 2007.
- 1 2 "Simbad Query Result". Simbad. Retrieved October 15, 2007.
- ↑ Slocum, Frederick (1929). "The parallax of 17 Lyrae C (abstract)". Popular Astronomy. 37: 328. Bibcode:1929PA.....37..328S.
This article is issued from Wikipedia - version of the 8/6/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.