41 Aquarii is a double star[3] in the equatorial constellation of Aquarius. 41 Aquarii is its Flamsteed designation. It is visible to the naked eye as a dim, orange-hued point of light with a combined apparent visual magnitude of 5.354.[2] The pair are located at a distance of around 239 light-years (73 parsecs) from the Sun based on parallax, but are drifting closer with a radial velocity of –25 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 14m 18.03271s[1] |
| Declination | –21° 04′ 28.4330″[1] |
| Apparent magnitude (V) | 5.354[2] |
| Characteristics | |
| Spectral type | K0 III + F8 V[3] |
| U−B color index | +0.465[2] |
| B−V color index | +0.834[2] |
| Astrometry | |
| 41 Aqr A | |
| Radial velocity (Rv) | −24.94±0.13[4] km/s |
| Proper motion (μ) | RA: +24.827[4] mas/yr Dec.: +54.923[4] mas/yr |
| Parallax (π) | 13.7811 ± 0.1850 mas[4] |
| Distance | 237 ± 3 ly (72.6 ± 1.0 pc) |
| Proper motion (μ) | RA: +27.266[5] mas/yr Dec.: +57.272[5] mas/yr |
| Parallax (π) | 13.5404 ± 0.0719 mas[5] |
| Distance | 241 ± 1 ly (73.9 ± 0.4 pc) |
| Details | |
| 41 Aqr A | |
| Radius | 7.88+0.09 −0.13[4] R☉ |
| Luminosity | 33.93±0.53[4] L☉ |
| Surface gravity (log g) | 2.85[6] cgs |
| Temperature | 4,750[6] K |
| Metallicity [Fe/H] | –0.13[6] dex |
| 41 Aqr B | |
| Radius | 1.76+0.29 −0.06[5] R☉ |
| Luminosity | 6.319±0.043[5] L☉ |
| Temperature | 6,899+115 −506[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The brighter component of the pair is a red clump[8] giant star with a stellar classification of K0 III[3] and a magnitude of 5.73. This is an aging star that has exhausted the supply of hydrogen at its core and is now generating energy through core helium fusion. It has eight[4] times the girth of the Sun and is radiating 34[4] times the luminosity of the Sun at an effective temperature of 4,750 K.[6]
At an angular separation of 5.148 arcseconds, the fainter companion is an F-type main sequence star with a magnitude 7.16 and a classification of F8 V.[3] It has 1.8[5] times the Sun's radius and is radiating six[5] times the Sun's luminosity from its photosphere at 6,899 K.[5]