| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19 54 08.27613 |
| Declination | –08° 34′ 27.1674″ |
| Apparent magnitude (V) | 5.79 |
| Characteristics | |
| Spectral type | K5 III |
| U−B color index | +2.00 |
| B−V color index | +1.664±0.006 |
| Astrometry | |
| Radial velocity (Rv) | −49.5±2.9 km/s |
| Proper motion (μ) | RA: +6.737 mas/yr Dec.: –18.578 mas/yr |
| Parallax (π) | 5.6650 ± 0.1739 mas |
| Distance | 580 ± 20 ly (177 ± 5 pc) |
| Absolute magnitude (MV) | −0.66 |
| Details | |
| Radius | 41.7+2.0 −2.6 R☉ |
| Luminosity | 391±14 L☉ |
| Temperature | 3,972+130 −91 K |
| Other designations | |
| 56 Aql, BD–08°5150, FK5 2131, GC 2343, HD 188154, HIP 97928, HR 7584, SAO 143894 | |
| Database references | |
| SIMBAD | data |
56 Aquilae is a single star in the equatorial constellation of Aquila. 56 Aquilae is its Flamsteed designation. Its apparent visual magnitude is 5.79, meaning it is barely visible to the naked eye as a dim, orange-hued point of light, under ideal viewing conditions. The star is located at a distance of around 580 light years away from the Sun, based on parallax. It is moving closer to the Earth with a heliocentric radial velocity of −50 km/s, and is predicted to come as near as 222 light-years in around 3.3 million years.
This is an aging giant star with a stellar classification of K5 III, having exhausted the supply of hydrogen at its core and expanded to 42 times the Sun's radius. It is radiating 391 times the luminosity of the Sun from its photosphere at an effective temperature of 3,972 K. 56 Aquilae is a double star, but it does not appear to be a binary star system. It is one of the double stars profiled in Admiral William Henry Smyth's 1864 work, Sidereal Chromatics.
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", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
- ^ 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.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- "56 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-01.
- ^ 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.
- James, Andrew, The application of Admiral Smyth's "Sidereal Chromatics", archived from the original on 2009-10-26, retrieved 2007-12-22.
External links
| Constellation of Aquila | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stars |
| ||||||||||||
| |||||||||||||
| |||||||||||||
| Nebulae |
| ||||||||||||
| Galaxies |
| ||||||||||||
 Category | |||||||||||||