R Aquilae

R Aquilae

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	19^h 06^m 22.2514^s
Declination	+08° 13′ 48.007″
Apparent magnitude (V)	6.09[1]
Characteristics
Spectral type	M6.5-9e[1]
U−B color index	0.37[1]
B−V color index	1.60[1]
Variable type	Mira[2]
Astrometry
Radial velocity (Rv)	34.60[1] km/s
Proper motion (μ)	RA: 3.79[1] mas/yr Dec.: -67.01[1] mas/yr
Parallax (π)	2.37 ± 0.87[1] mas
Distance	approx. 1,400 ly (approx. 400 pc)
Absolute magnitude (MV)	−2.04
Other designations
BD+08 3970, HD 177940, HIP 93820, HR 7243, SAO 124266.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

R Aquilae is a Mira variable in the constellation Aquila. Over a period of approximately 270 days, the apparent magnitude of this star varies from 5.5 to 12.^[2] The period was over 300 days when first observed, and has declined steadily since.^[3]

References

1. "R Aquilae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 June 2014.
2. VSX; Otero, Sebastian (4 January 2011). "R Aquilae". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013.
3. Greaves, J; Howarth, J. J. (June 2000). "Further investigations of R Aquilae". Journal of the British Astronomical Association 110 (3): 131–142. Bibcode:2000JBAA..110..131G.