Location of 23 Aql (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19 18 32.49672 |
| Declination | +01° 05′ 06.4941″ |
| Apparent magnitude (V) | 5.10 |
| Characteristics | |
| Spectral type | K1 II/III |
| U−B color index | +1.01 |
| B−V color index | +1.15 |
| Astrometry | |
| Radial velocity (Rv) | −23.13±0.19 km/s |
| Proper motion (μ) | RA: +11.242 mas/yr Dec.: +15.753 mas/yr |
| Parallax (π) | 8.0976 ± 0.3042 mas |
| Distance | 400 ± 20 ly (123 ± 5 pc) |
| Absolute magnitude (MV) | +0.7 |
| Details | |
| Radius | 19.04+0.41 −0.17 R☉ |
| Luminosity | 164.789±6.995 L☉ |
| Temperature | 4,740+153 −51 K |
| Rotational velocity (v sin i) | 10 km/s |
| Other designations | |
| 23 Aql, BD+00°4168, HD 180972, HIP 94885, HR 7319, SAO 124487 | |
| Database references | |
| SIMBAD | data |
23 Aquilae is a binary star 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, 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. The system is moving closer to the Earth with a heliocentric radial velocity of –23 km/s.
The primary component of this system is a magnitude 5.31 K-type giant star or bright giant with a stellar classification of K1. The star is radiating 165 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,740 K. Orbiting at an angular separation of 3.25 arcseconds is a magnitude 8.76 companion star.
References
- ^ 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.
- ^ 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.
- ^ 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.
- 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.
- ^ 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.
External links
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