23 Aquilae
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 18m 32.49672s[1] |
| Declination | +01° 05′ 06.4941″[1] |
| Apparent magnitude (V) | 5.10[2] |
| Characteristics | |
| Spectral type | K1 II/III[3] |
| U−B color index | +1.01[2] |
| B−V color index | +1.15[2] |
| Astrometry | |
| Radial velocity (Rv) | −23.13±0.19[4] km/s |
| Proper motion (μ) | RA: +11.242[1] mas/yr Dec.: +15.753[1] mas/yr |
| Parallax (π) | 8.0976±0.3042 mas |
| Distance | 400 ± 20 ly (123 ± 5 pc) |
| Absolute magnitude (MV) | +0.7[5] |
| Details | |
| Mass | 1.1[6] M☉ |
| Radius | 21[7] R☉ |
| Luminosity | 197[7] L☉ |
| Surface gravity (log g) | 1.85[6] cgs |
| Temperature | 4,202[6] K |
| Metallicity [Fe/H] | 0.13[6] dex |
| Rotational velocity (v sin i) | 10[8] km/s |
| Other designations | |
| 23 Aql, BD+00°4168, HD 180972, HIP 94885, HR 7319, SAO 124487[9] | |
| Database references | |
| SIMBAD | data |
23 Aquilae is a binary star[10] system in the equatorial constellation of Aquila. 23 Aquilae is its Flamsteed designation. It is at a distance of about 400 light-years (120 parsecs) with an apparent visual magnitude of 5.10,[2] which is bright enough to be faintly visible to the naked eye as an orange-hued star. The brightness of the star is diminished by 0.21 in magnitude because of extinction from interstellar dust and gas.[4] The system is moving closer to the Earth with a heliocentric radial velocity of –23 km/s.[4]
The primary component of this system is a magnitude 5.31 K-type giant star or bright giant with a stellar classification of K1.[11] The star is radiating 197 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,202 K.[6] Orbiting at an angular separation of 3.25 arcseconds is a magnitude 8.76 companion star.[10]
References
[edit]- ^ a b c d 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 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
- ^ a b c Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ Wilson, O. C. (1976). "Absolute magnitudes of stars from widths of chromospheric Ca II emission lines". Astrophysical Journal. 205: 823. Bibcode:1976ApJ...205..823W. doi:10.1086/154338.
- ^ a b c d e Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765.
- ^ a b Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane; Dressing, Courtney D.; Huber, Daniel; Kane, Stephen R.; Lépine, Sébastien; Mann, Andrew; Muirhead, Philip S.; Rojas-Ayala, Bárbara; Silvotti, Roberto; Fleming, Scott W.; Levine, Al; Plavchan, Peter; the TESS Target Selection Working Group (2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050.
- ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ "* 23 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-25.
- ^ a b 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.
- ^ Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode:1962RGOB...51...79E.
