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HD 170521

HD 170521
Location of HD 170521 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 31m 56.22382s[1]
Declination −43° 30′ 26.5714″[1]
Apparent magnitude (V) 5.69±0.01[2]
Characteristics
Spectral type K2 III[3]
B−V color index +1.34[4]
Astrometry
Radial velocity (Rv)7.2±0.4[5] km/s
Proper motion (μ) RA: −1.328 mas/yr[1]
Dec.: −8.795 mas/yr[1]
Parallax (π)2.1538 ± 0.1596 mas[1]
Distance1,500 ± 100 ly
(460 ± 30 pc)
Absolute magnitude (MV)−1.90[6]
Details
Mass1.55[7] M☉
Radius78.6±4.1[8] R☉
Luminosity934[9] L☉
Surface gravity (log g)0.96[10] cgs
Temperature4,474±122[11] K
Metallicity [Fe/H]−0.49[7] dex
Rotational velocity (v sin i)6.5±1[12] km/s
Other designations
12 G. Coronae Australis[13], CD−43°12600, CPD−34°8647, GC 25272, HD 170521, HIP 90842, HR 6937, SAO 229094[14]
Database references
SIMBADdata

HD 170521, also known as HR 6937 or rarely 12 G. Coronae Australis, is a solitary star[15] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.69.[2] The object is located relatively far at a distance of approximately 1,500 light years based on Gaia DR3 parallax measurements,[1] and it is receding with a heliocentric radial velocity of 7.2 km/s.[5] At its current distance, HD 170521's brightness is heavily diminished by 0.46 magnitudes due to extinction from interstellar dust[16] and it has an absolute magnitude of −1.90.[6]

HD 170521 has a stellar classification of K2 III,[3] indicating that it is an evolved red giant. It has 1.55 times the mass of the Sun[7] but it has expanded to 78.6 times the Sun's radius.[8] The object radiates 934 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 4,474 K.[11] HD 170521 is metal deficient with an iron abundance only 32.4% that of the Sun (Fe/H) = −0.49[7] and it spins modestly with a projected rotational velocity of 6.5 km/s.[12]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).

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