4 Aquarii
| Observation data Epoch J2000 Equinox J2000 | ||
|---|---|---|
| Constellation | Aquarius | |
| Right ascension | 20h 51m 25.74827s[1] | |
| Declination | −05° 37′ 35.8719″[1] | |
| Apparent magnitude (V) | 5.99[2] (6.40 + 7.43)[3] | |
| Characteristics | ||
| Spectral type | F7 IV + F6: V:[4] | |
| B−V color index | 0.464±0.003[2] | |
| Absolute magnitude (MV) | 2.15[6] | |
Argument of periastron (ω)(secondary) | 45.9±1.2° | |
| Details Gyr | ||
| 4 Aqr B | ||
| Mass | 1.331±0.003[7] M☉ | |
| Database references | ||
| SIMBAD | 4 Aqr | |
| 4 Aqr A | ||
| 4 Aqr B | ||
4 Aquarii (abbreviated 4 Aqr) is a
apparent visual magnitude of 5.99.[2] The system is moving closer to the Earth with a heliocentric radial velocity of −21.5 km/s.[5]
This is a visual binary with an
Sun's luminosity from its photosphere at an effective temperature of 6,440 K.[6] The magnitude 7.43[3] secondary, component B, is a suspected F-type main-sequence star of class F6 V.[4] The pair are an estimated 1.6 billion years old.[8]
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