66 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 13m 13.87230s[1] |
| Declination | −01° 00′ 33.7724″[1] |
| Apparent magnitude (V) | 5.44[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| B−V color index | 1.430±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | −30.1±1.7[4] km/s |
| Proper motion (μ) | RA: +32.872[1] mas/yr Dec.: –15.851[1] mas/yr |
| Parallax (π) | 4.4436±0.3133 mas[1] |
| Distance | 730 ± 50 ly (230 ± 20 pc) |
| Absolute magnitude (MV) | −1.20[2] |
| Details | |
| Mass | 1.4[5] M☉ |
| Radius | 55[6] R☉ |
| Luminosity | 753[1] L☉ |
| Surface gravity (log g) | 1.27[7] cgs |
| Temperature | 4,006[7] K |
| Metallicity [Fe/H] | −0.19[5] dex |
| Age | 2.3[7] Gyr |
| Other designations | |
| 66 Aql, BD−01°3920, GC 28068, HD 192107, HIP 99631, HR 7720, SAO 144181[8] | |
| Database references | |
| SIMBAD | data |
66 Aquilae, abbreviated 66 Aql, is a fifth-magnitude star in the constellation of Aquila. 66 Aquilae is its Flamsteed designation. It is visible to the naked eye, having an apparent visual magnitude of 5.44.[2] The star shows an annual parallax shift of 4.4 mas,[1] which provides a distance estimate of around 730 light years. It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s.[4] The motion of the star over time suggests some displacement, which may indicate it is a close binary system.[9]
This is an aging giant star with a stellar classification of K5 III,[3] which indicates it has exhausted the supply of hydrogen at its core and expanded off the main sequence. The measured angular diameter of this star, after correcting for limb darkening, is 2.44±0.03 mas.[10] At its estimated distance, this yields a physical size of roughly 55 times the radius of the Sun.[6] It is radiating 753 times the Sun's luminosity[1] from its enlarged photosphere at an effective temperature of 4,006 K,[7] giving the star an orange hue. This star was part of the obsolete constellation Anguilla.
References
- ^ a b c d e f g h 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.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
- ^ a b Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ a b Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- ^ a b c d Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A.; Andrae, R.; Poggio, E.; Spitoni, E.; Contursi, G.; Zhao, H.; Oreshina-Slezak, I.; Ordenovic, C.; Bijaoui, A. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics. 669: A104. arXiv:2206.07937. Bibcode:2023A&A...669A.104K. doi:10.1051/0004-6361/202244283.
- ^ "66 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 1, 2018.
- ^ Mason, Brian D.; Martin, Christian; Hartkopf, William I.; Barry, Donald J.; Germain, Marvin E.; Douglass, Geoffrey G.; Worley, Charles E.; Wycoff, Gary L.; Ten Brummelaar, Theo; Franz, Otto G. (1999), "Speckle Interferometry of New and Problem HIPPARCOS Binaries", The Astronomical Journal, 117 (4): 1890, Bibcode:1999AJ....117.1890M, doi:10.1086/300823
- ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039