| 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 |
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]
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]
References
- ^ a b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode: 1982A&AS...47..221R.
- ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode: 1990ApJS...74.1075M, doi: 10.1086/191527.
- ^ "41 Aqr -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-02-23.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
