4 Aquarii
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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 |
| Characteristics | |
| Spectral type | F5V+ |
| U−B color index | 0.03 |
| B−V color index | 0.46 |
| Variable type | Variable star |
| Astrometry | |
| 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 |
| Details | |
| Mass | 1.7 M☉ |
| Radius | 1.4 R☉ |
| Luminosity | 6 L☉ |
| Temperature | 6,000–7,500 K |
| Orbit | |
| 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 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| 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 approximately 190 light-years from Earth with an absolute magnitude of 6.48.
4 Aquarii is a visual binary star.[1] 4 Aquarii B is .855" (degree seconds) from 4 Aquarii and orbits around the primary every 187 years. There are two optical companions.
References
- ^ Bartkevičius, A.; Gudas, A. (2002). "Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions". Baltic Astronomy 11: 153–203. Bibcode 2002BaltA..11..153B.
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