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4 Aquarii

4 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 51m 25.7483s
Declination -05° 37′ 35.878″
Apparent magnitude (V) 6.07
Spectral type F5V+
U-B color index 0.03
B-V color index 0.46
Variable type Variable star
Radial velocity (Rv) -24.6 km/s
Proper motion (μ) RA: 95.77 mas/yr
Dec.: 1.25 mas/yr
Parallax (π) 16.97 ± 1.26 mas
Distance 190 ± 10 ly
(59 ± 4 pc)
Absolute magnitude (MV) 6.48
Mass 1.7 M
Radius 1.4 R
Luminosity 6 L
Temperature 6,000–7,500 K
Metallicity ?
Rotation ?
Age ? years
Companion 4 Aquarii B
Period (P) 187 yr
Semimajor axis (a) 0.855"
Eccentricity (e) 0.47
Inclination (i) 68.3°
Longitude of the node (Ω) 173.9°
Periastron epoch (T) 1896.2
Companion 4 Aquarii C
Semimajor axis (a) 72.7"
Inclination (i) 313°
Companion 4 Aquarii D
Semimajor axis (a) 131.2"
Inclination (i) 329°
Other designations
ZI 1956, GC 29078, 2MASS J20512575-0537355, UBV 18044, GCRV 13083, NSV 13350, uvby98 100198571 AB, STF 2729AB, PLX 4983, YZ 95 7466, ADS 14360 AB, GSC 05190-02008, PPM 204535, YZ 0 4423, BD-06° 5604, HD 198571, SAO 144877, WDS J2051.4-0538, CCDM J20514-0537AB, HIC 102945, WDS J20513-0537AB, CSI-06 5604 1, HIP 102945, TD1 27348, WDS J20514-0538, CSV 102036, HR 7982, TYC 5190-2008-1.
Database references
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

4 Aquarii or CCDM J20514-0537 AB is a variable star with a spectral type of F5V. It is a white main-sequence star with strengthened H and K lines of Ca II and has neutral metal ionizations. 4 Aquarii is approximatly 190 light-years from Earth with an absolute magnitude of 6.48.

4 Aquarii A has three companion stars, 4 Aquarii B and 4 Aquarii C and 4 Aquarii D, which makes it a quadruple star system. 4 Aquarii B is .855" (degree seconds) from 4 Aquarii and revolves around every 187 years. The distances between any of the stars in the system would allow possible formation of planetary systems about any of the stars, but would be of extremely close proximity to the mother star due to the gravitational pull of the other stars.


NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
CCDM J20514-0537 C (BD-06 5604C) 20h 51m 22.0s -05° 36' 44 12.9 Simbad
CCDM J20514-0537 D (BD-06 5604D) 20h 51m 31.9s -05° 38' 58 9.4 Simbad




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