17 Lyrae
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| 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 our 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]
[edit] See also
[edit] References
- ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=*+17+Lyr&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Retrieved October 15, 2007.
- ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=CCDM%20J19075%2B3231B. Retrieved October 15, 2007.
- ^ Slocum, Frederick (1929). "The parallax of 17 Lyrae C (abstract)". Popular Astronomy 37: 328. Bibcode 1929PA.....37..328S.
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