R Lyrae
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| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 55m 20.1013s |
| Declination | +43° 56' 45.919" |
| Apparent magnitude (V) | 3.9 - 5.0[2] 4.20[1] |
| Characteristics | |
| Spectral type | M5III |
| Apparent magnitude (J) | -0.7[1] |
| U−B color index | +1.41 |
| B−V color index | +1.59 |
| Astrometry | |
| Radial velocity (Rv) | -28.3 km/s |
| Proper motion (μ) | RA: 19.94 mas/yr Dec.: 80.60 mas/yr |
| Parallax (π) | 9.33 ± 0.52 mas |
| Distance | 350 ± 20 ly (107 ± 6 pc) |
| Other designations | |
R Lyrae is a 4th magnitude star in the constellation Lyra, approximately 350 light years away from Earth. It is a red giant star of the spectral type M5III, meaning it has a surface temperature of under 3,500 kelvins. It is much larger and brighter, yet cooler, than our Sun. It is a semiregular pulsating star.[1] It is unusual in that it is a red star with a high proper motion (greater than 50 milliarcseconds a year).[3] In the near-infrared J band, it is brighter than Vega.
References
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