7 Aquarii

7 Aquarii

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius
Right ascension	20h 56m 54.0278s
Declination	-09° 41′ 51.161″
Apparent magnitude (V)	5.499
Characteristics
Spectral type	K5III
U−B color index	1.71
B−V color index	1.47
Variable type	Variable star
Astrometry
Radial velocity (Rv)	-32.7 km/s
Proper motion (μ)	RA: -3.51 mas/yr Dec.: -11.53 mas/yr
Parallax (π)	5.42 ± 0.99 mas
Distance	approx. 600 ly (approx. 180 pc)
Absolute magnitude (MV)	7.002
Details
Mass	0,8 M☉
Radius	0,9 R☉
Luminosity	0,4 L☉
Temperature	3,500–5,000 K
Metallicity	?
Rotation	?
Age	? years
Orbit
Companion	7 Aquarii B
Semi-major axis (a)	2.1"
Inclination (i)	165°
Orbit
Companion	7 Aquarii C
Semi-major axis (a)	176.5"
Inclination (i)	67°
Other designations
ZI 1966, GC 29220, HR 8015, SAO 144968, GCRV 13152, IDS 20515-1004 A, BU 1034AB, IRAS 20541-0953, SRS 16468, ADS 14449 AB, GSC 05774-01594, IRC -10553, TYC 5774-1594-1, ADS 14449 A, HD 199345, 2MASS J20565402-0941511, YZ 99 7416, BD-10° 5553, HERZ 15809, CCDM J20570-0941AB, HIC 103401, NSV 13419, CSV 102046, HIP 103401, PPM 204646.
Database references
SIMBAD	data
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

7 Aquarii (abbreviated 7 Aqr) is a variable star in the constellation Aquarius. 7 Aquarii is the Flamsteed designation. Its apparent magnitude is 5.49.

Components

NAME	Right ascension	Declination	Apparent magnitude (V)	Spectral type	Database references
7 Aquarii B (BD-10 5554)	20h 57m 05.0002s	-09° 40' 39.041	9.81	M	Simbad

References

• Image 7 Aquarii