HD 201647

HD 201647
Location of HD 201647 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 12m 13.71281s[1]
Declination −40° 16′ 09.7010″[1]
Apparent magnitude (V) 5.83[2] (5.83 - 5.86)[3]
Characteristics
Spectral type F5 V[4][5]
B−V color index +0.45[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)4.5±0.9[6] km/s
Proper motion (μ) RA: +58.359 mas/yr[1]
Dec.: −218.773 mas/yr[1]
Parallax (π)31.4586 ± 0.0401 mas[1]
Distance103.7 ± 0.1 ly
(31.79 ± 0.04 pc)
Absolute magnitude (MV)+3.33[7]
Details
Mass1.28[8] M☉
Radius1.47+0.07
−0.04[9] R☉
Luminosity3.79±0.01[1] L☉
Surface gravity (log g)4.21±0.01[10] cgs
Temperature6,637±80[11] K
Metallicity [Fe/H]+0.06±0.01[12] dex
Rotational velocity (v sin i)25.1±2.5[13] km/s
Age916[8] Myr
Other designations
55 G. Microscopii[14], NSV 25506, CD−40°14216, CPD−40°9488, GC 29614, GJ 9726, HD 201647, HIP 104680, HR 8100, SAO 230575, LTT 8410, TIC 159670453[15]
Database references
SIMBADdata

HD 201647 (HR 8100; Gliese 9726; LTT 8410) is a solitary star[16] located in the southern constellation Microscopium. It is faintly visible to the naked eye as a yellowish-white-hued star with an apparent magnitude of 5.83.[2] The object is located relatively close at a distance of light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 4.5 km/s.[6] At its current distance, HD 201647's brightness is diminished by 0.11 magnitudes due to interstellar extinction[17] and it has an absolute magnitude of +3.33.[7] It has a relatively high proper motion across the celestial sphere, moving at a rate of 226.331 mas/yr.[18]

HD 201647 has a stellar classification of F5 V,[5][4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.28 times the mass of the Sun[8] and 1.47 times the radius of the Sun.[9] It radiates 3.79 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 6,637 K.[11] HD 201647 is slightly metal enriched with an iron abundance of [Fe/H] = +0.06 or 115% of the Sun's.[12] It is estimated to be 916 million years old[8] and it spins modestly with a projected rotational velocity of 25.1 km/s.[13]

In the discovery paper for Lacaille 8760, HD 201647 was reported to be a variable star that varied between 5.83 and 5.86 in the visual passband.[3] As of 2004 however, it has not been confirmed to be variable.[19]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Byrne1981 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Adams1935 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 Stassun2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference AP1999 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference De Medeiros2014 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 Eggleton2008 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Knapp2019 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Samus2004 was invoked but never defined (see the help page).