Key facts
- Constellation
- Lyra
- Right ascension
- 19 25 27.91285
- Declination
- +42 ° 47 ′ 03.6942 ″
- Apparent magnitude v
- 7.06–8.12
- Evolutionary stage
- horizontal branch
- Spectral type
- A7III - F8III
- U b color index
- +0.172
- B v color index
- +0.181
- Variable type
- RR Lyr
via Wikipedia infobox
Wikidata facts
- Distance from Earth
- 0.3
- Mass
- 0.65
- Image
- RR Lyrae.png
Show 12 more facts
- spectral class
- F5
- catalog code
- Gaia DR2 2125982599341232896
- right ascension
- 291.36630134676420
- declination
- 42.78435850947250
- effective temperature
- 6070
- surface gravity
- 95
- radial velocity
- -70.8
- apparent magnitude
- 6.648
- parallax
- 3.64
- metallicity
- -1.40
- right ascension component of proper motion
- -109
- declination component of proper motion
- -195
Sources (2)
via Wikidata · CC0
~4 min read
Article
RR Lyrae is a variable star in the Lyra constellation, figuring in its west near to Cygnus. As the brightest star in its class, it became the eponym for the RR Lyrae variable class of stars and it has been extensively studied by astronomers. RR Lyrae variables serve as important standard candles that are used to measure astronomical distances. The period of pulsation of an RR Lyrae variable depends on its mass, luminosity and temperature, while the difference between the measured luminosity and the actual luminosity allows its distance to be determined via the inverse-square law. Hence, understanding the period-luminosity relation for a local set of such stars allows the distance of more distant stars of this type to be determined.
History