Pi Aquilae

Pi Aquilae
Diagram showing star positions and boundaries of the Aquila constellation and its surroundings
Location of π Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 48m 42.05765s[1]
Declination +11° 48′ 57.2177″[1]
Apparent magnitude (V) 5.85 (6.47/6.75)[2]
Characteristics
Spectral type G8 III: + A1 V[2][3]
Astrometry
Radial velocity (Rv)+12.6[3] km/s
Proper motion (μ) RA: +16.16[1] mas/yr
Dec.: –10.60[1] mas/yr
Parallax (π)6.34 ± 0.52 mas[1]
Distance510 ± 40 ly
(160 ± 10 pc)
Absolute magnitude (MV)−0.22[4]
Details
Luminosity108[4] L☉
Other designations
π Aql, 52 Aquilae, BD+11 3994, HIP 97473, HR 7544, SAO 105282[5]
A: HD 187259
B: HD 187260
Database references
SIMBADdata
A
B

Pi Aquilae, Latinised from π Aquilae, is the Bayer designation for a binary star[2] system in the equatorial constellation of Aquila, about 3° to the north of the bright star Altair.[3] The apparent visual magnitude of the system is 5.85,[2] making it faintly visible to the naked eye from dark suburban skies. Based upon an annual parallax shift of 6.34 mas, the distance to this system is roughly 510 light-years (160 parsecs).[1]

The binary nature of this system was first discovered by William Herschel in 1785.[3] The primary component of is a magnitude 6.47[2] giant star with a stellar classification of G8 III:.[2] A companion star at an angular separation of 1.437 arcseconds is an A-type main-sequence star with a classification of A1 V.[2] It is slightly fainter, with an apparent magnitude of 6.75.[2]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference jha10_4_433 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. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).