Astronomy:56 Aquilae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 54m 08.27613s[1] |
| Declination | –08° 34′ 27.1674″[1] |
| Apparent magnitude (V) | 5.79[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +2.00[2] |
| B−V color index | +1.664±0.006[4] |
| Astrometry | |
| Radial velocity (Rv) | −49.5±2.9[5] km/s |
| Proper motion (μ) | RA: +6.737[1] mas/yr Dec.: –18.578[1] mas/yr |
| Parallax (π) | 5.6650 ± 0.1739[1] mas |
| Distance | 580 ± 20 ly (177 ± 5 pc) |
| Absolute magnitude (MV) | −0.66[4] |
| Details | |
| Radius | 41.7+2.0 −2.6[1] R☉ |
| Luminosity | 391±14[1] L☉ |
| Temperature | 3,972+130 −91[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
56 Aquilae is a single[7] star in the equatorial constellation of Aquila. 56 Aquilae is its Flamsteed designation. Its apparent visual magnitude is 5.79,[2] 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.[1] It is moving closer to the Earth with a heliocentric radial velocity of −50 km/s,[5] 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,[3] having exhausted the supply of hydrogen at its core and expanded to 42[1] times the Sun's radius. It is radiating 391[1] times the luminosity of the Sun from its photosphere at an effective temperature of 3,972 K.[1] 56 Aquilae is a double star,[8] but it does not appear to be a binary star system.[7] It is one of the double stars profiled in Admiral William Henry Smyth's 1864 work, Sidereal Chromatics.
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 5, Bibcode: 1999MSS...C05....0H.
- ↑ 4.0 4.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=56+Aql.
- ↑ 7.0 7.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ James, Andrew, The application of Admiral Smyth's "Sidereal Chromatics", http://homepage.mac.com/andjames/Page029j0.htm, retrieved 2007-12-22.
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