R Lyrae

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R Lyrae[1]
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 Lyra
Right ascension 18h 55m 20.1013s
Declination +43° 56' 45.919"
Apparent magnitude (V) 4.20
Characteristics
Spectral type M5III
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, 13 Lyrae, HR 7157, BD+43°3117, HD 175865, SAO 47919, HIP 92862, GC 25996, GSC 03131-02155

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]

[edit] References

  1. ^ a b Simbad Query Result. Simbad. Retrieved on October 16, 2007.
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