42 Aquilae

42 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 37m 47.31770s[1]
Declination −04° 38′ 51.5072″[1]
Apparent magnitude (V) 5.45[2]
Characteristics
Spectral type F3 IV/V[3]
B−V color index 0.429±0.003[2]
Astrometry
Radial velocity (Rv)−37.6±1.8[4] km/s
Proper motion (μ) RA: +105.381[1] mas/yr
Dec.: –53.557[1] mas/yr
Parallax (π)31.1671 ± 0.1422 mas[1]
Distance104.6 ± 0.5 ly
(32.1 ± 0.1 pc)
Absolute magnitude (MV)2.98[5]
Details
Mass1.26[6] M☉
Luminosity5.76[2] L☉
Surface gravity (log g)4.00[6] cgs
Temperature6,749±80[4] K
Metallicity [Fe/H]0.17[4] dex
Rotational velocity (v sin i)87.0±4.4[5] km/s
Age1.283[6] Gyr
Other designations
42 Aql, BD−04° 4861, HD 185124, HIP 96556, HR 7460, SAO 143621[7]
Database references
SIMBADdata

42 Aquilae, abbreviated 42 Aql, is a single[8] star in the equatorial constellation of Aquila. 42 Aquilae is its Flamsteed designation. It is a dim star but visible to the naked eye under suitable viewing conditions, having an apparent visual magnitude of 5.45.[2] 42 Aql is located some 104.6 light years away, as determined from its annual parallax shift of 31.2 mas.[1] it is moving closer to the Earth with a heliocentric radial velocity of −38 km/s,[4] and is predicted to come to within 52 light-years of the Sun in around 752,000 years.[2]

The stellar classification of this star is F3 IV/V,[3] which matches an F-type star with blended spectral traits of a main sequence star and a subgiant star. It is around 1.3[6] billion years old with a relatively high rate of rotation, having a projected rotational velocity of 87 km/s.[5] The star has 1.26[6] times the mass of the Sun and is radiating 5.76[2] times the Sun's luminosity from its photosphere at an effective temperature of 6,749 K.[4] These coordinates are a source of X-ray emission, which is most likely (99.3% chance) coming from the star.[9]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 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 c d e Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference vonEiff2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).