12 Aquarii

12 Aquarii

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius
Right ascension	21^h 04^m 04.74^s
Declination	-05° 49′ 23.08″
Apparent magnitude (V)	5.89
Characteristics
Spectral type	G4III
U−B color index	0.41
B−V color index	0.68
Astrometry
Radial velocity (Rv)	1.1 km/s
Proper motion (μ)	RA: 22.4 mas/yr Dec.: 4.0 mas/yr
Parallax (π)	6.03 ± 1.17 mas
Distance	approx. 500 ly (approx. 170 pc)
Absolute magnitude (MV)	7.4
Details
Mass	1.1 M☉
Radius	1.1 R☉
Luminosity	1.2 L☉
Temperature	5,000–6,000 K
Metallicity	?
Rotation	?
Age	? years
Orbit
Companion	12 Aquarii B
Semi-major axis (a)	0.1"
Orbit
Companion	12 Aquarii C
Semi-major axis (a)	2.4"
Inclination (i)	195°
Other designations
HD 200497, ADS 14592 A, GC 29417, PPM 204770, BD-06° 5664A, GCRV 13234, SAO 145065, MCA 66Aa, CCDM J21041-0549A, HR 8059, STF 2745A, CSI-06 5664 2, IDS 20588-0613 A, WDS J21041-0549A.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

12 Aquarii (abbreviated 12 Aqr) is a double star in the constellation Aquarius. 12 Aquarii is the Flamsteed designation. It is a yellow sub-giant that is slightly larger and heavier than the Sun with an apparent magnitude of 5.53 and absolute magnitude 7.4, making it less bright than the Sun comparatively.

Components

NAME	Right ascension	Declination	Apparent magnitude (V)	Spectral type	Database references
12 Aquarii B (CSI-06 5664 1)	21^h 04^m 04.58^s	-05° 49' 24.2	7.31	A3V	Simbad
12 Aquarii C (CSI-06 5664 3)	21^h 04^m 04.7247^s	-05° 49' 23.038	5.53	G4	Simbad

References

• Image 12 Aquarii