37 Aquilae

This article is about k Aquilae. Not to be confused with κ Aquilae.
37 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 35m 07.25793s[1]
Declination −10° 33′ 37.6010″[1]
Apparent magnitude (V) 5.12[2]
Characteristics
Spectral type G8 IIIa[3]
B−V color index 1.122[4]
Astrometry
Radial velocity (Rv)−30.17±0.13[1] km/s
Proper motion (μ) RA: +7.656[1] mas/yr
Dec.: –2.316[1] mas/yr
Parallax (π)7.3533 ± 0.1453 mas[1]
Distance444 ± 9 ly
(136 ± 3 pc)
Absolute magnitude (MV)−0.61[2]
Details[5]
Mass2.30±0.43 M☉
Radius23.38±1.17 R☉
Luminosity218.6±21.2 L☉
Surface gravity (log g)2.07±0.09 cgs
Temperature4,594±30 K
Metallicity [Fe/H]−0.16±0.10 dex
Rotational velocity (v sin i)8.88[4] km/s
Age1.20±0.82 Gyr
Other designations
37 Aql, BD−10° 5122, FK5 3562, GC 27046, HD 184492, HIP 96327, HR 7430, SAO 162792, PPM 236209[6]
Database references
SIMBADdata

37 Aquilae, abbreviated 37 Aql, is a star in the equatorial constellation of Aquila. 37 Aquilae is its Flamsteed designation. It has an apparent visual magnitude of approximately 5.12,[2] which is bright enough to be visible to the naked eye. The distance to 37 Aql can be estimated from its annual parallax shift of 7.4 mas,[1] yielding a range of 444 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −30 km/s,[1] and is predicted to come to within 72 light-years in around 4.4 million years.[2]

This is an aging giant star with a stellar classification of G8 IIIa.[3] It is uncertain whether this star is on the red giant branch or the horizontal branch; Reffert et al. (2015) give 57% odd that it is the latter. In that case, their model shows an estimated age of 1.2 billion years with 2.3 times the mass of the Sun and 23 times the Sun's radius. It is radiating 219 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,594 K.[5] These coordinates are a source of X-ray emission, which is most likely coming from the star.[7]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference hekker2007 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference reffert2015 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. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).