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HD 170384

HD 170384
Location of HD 170384 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 31m 02.94877s[1]
Declination −41° 54′ 49.8025″[1]
Apparent magnitude (V) 6.02±0.01[2]
Characteristics
Evolutionary stage main sequence star[3]
Spectral type A3 V[4]
B−V color index +0.14[5]
Astrometry
Radial velocity (Rv)−11.4±0.4[6] km/s
Proper motion (μ) RA: −3.406 mas/yr[1]
Dec.: −31.578 mas/yr[1]
Parallax (π)14.2387 ± 0.0341 mas[1]
Distance229.1 ± 0.5 ly
(70.2 ± 0.2 pc)
Absolute magnitude (MV)+1.86[7]
Details
Mass2.00[8] M☉
Radius1.91±0.10[9] R☉
Luminosity16.7+1.1
−1.0[3] L☉
Surface gravity (log g)4.19+0.08
−0.07[10] cgs
Temperature8,694[11] K
Metallicity [Fe/H]−0.01[12] dex
Rotation19.2 h[13]
Rotational velocity (v sin i)127±5[13] km/s
Age544[8] Myr
Other designations
11 G. Coronae Australis[14], CD−41°12871, CPD−41°8697, GC 25249, HD 170384, HIP 90759, HR 6931, SAO 229080[15]
Database references
SIMBADdata

HD 170384, also known as HR 6931 or rarely 11 G. Coronae Australis, is a solitary white-hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.02,[2] making it barely visible to the naked eye, even under ideal conditions. The object is located relatively close at a distance of 229.1 light-years based on Gaia DR3 parallax measurements[1] and it is drifting closer with a heliocentric radial velocity of −11.4 km/s.[6] At its current distance, HD 170384's brightness is diminished by interstellar extinction of 0.28 magnitudes[16] and it has an absolute magnitude of +1.86.[7]

This object has a stellar classification of A3 V, indicating that it is an ordinary A-type main-sequence star. It has double the Sun's mass[8] and 1.91 times the radius of the Sun.[9] It radiates 16.7 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 8,694 K.[11] HD 170384 has a near solar metallicity at [Fe/H] = −0.01 (97% solar)[12] and it is estimated to be 544 million years old,[8] having completed 45% of its main sequence lifetime.[3] Like many hot stars HD 170384 spins rapidly, having a projected rotational velocity of 127 km/s and an estimated rotation period of 19.2 hours.[13]

  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 c d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Corben1971 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Balona2019 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  13. ^ a b c Cite error: The named reference Reiners2004 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference SIMBAD 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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