56 Aquilae

56 Aquilae
Observation data
Epoch J2000      Equinox J2000
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 mas[1]
Distance580 ± 20 ly
(177 ± 5 pc)
Absolute magnitude (MV)−0.66[4]
Details
Radius41.7+2.0
−2.6[1] R☉
Luminosity391±14[1] L☉
Temperature3,972+130
−91[1] K
Other designations
56 Aql, BD–08°5150, FK5 2131, GC 2343, HD 188154, HIP 97928, HR 7584, SAO 143894[6]
Database references
SIMBADdata

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.

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SiderealChromatics was invoked but never defined (see the help page).