4 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.99[2] (6.40 + 7.43)[3] |
| Characteristics | |
| Spectral type | F7 IV + F6: V:[4] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.50[5] km/s |
| Proper motion (μ) | RA: 95.47[1] mas/yr Dec.: 1.78[1] mas/yr |
| Parallax (π) | 16.47±0.59 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.15[6] |
| Orbit[7] | |
| Period (P) | Script error: No such module "val". yr |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | B Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details[6] | |
| 4 Aqr A | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Luminosity | 11.0 Template:Solar luminosity |
| Surface gravity (log g) | 3.79 cgs |
| Temperature | 6,440 K |
| Metallicity [Fe/H] | 0.18[8] dex |
| Rotational velocity (v sin i) | 34.6 km/s |
| Age | 1.60[8] Gyr |
| 4 Aqr B | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | 4 Aqr |
| 4 Aqr A | |
| 4 Aqr B | |
Script error: No such module "Check for unknown parameters".
4 Aquarii (abbreviated 4 Aqr) is a binary star system in the constellation Aquarius,[9] located approximately 198 light years away from the Sun.[1] 4 Aquarii is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with a combined 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 orbital period of 200.7 years and an eccentricity of 0.535.[7] The magnitude 6.40[3] primary, designated component A, is an F-type subgiant star with a stellar classification of F7 IV,[4] suggesting that it has exhausted the hydrogen at its core and evolved off the main sequence.[7] It has a dynamically-measured mass 1.6[7] times that of the Sun and is radiating 11 times the 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]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e f Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b c d e f Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b Template:Cite simbad
Script error: No such module "Check for unknown parameters".