HD 182509

HD 182509
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 27m 48.11739s[1]
Declination −54° 19′ 30.9786″[1]
Apparent magnitude (V) 5.69±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K4 III[4]
U−B color index +1.68[5]
B−V color index +1.40[5]
Astrometry
Radial velocity (Rv)−5±4.3[6] km/s
Proper motion (μ) RA: −5.554 mas/yr[1]
Dec.: +9.807 mas/yr[1]
Parallax (π)5.1371 ± 0.0763 mas[1]
Distance635 ± 9 ly
(195 ± 3 pc)
Absolute magnitude (MV)−0.38[7]
Details
Mass1.12[8] M☉
Radius32.6[9] R☉
Luminosity329[10] L☉
Surface gravity (log g)1.35[8] cgs
Temperature4,316±122[9] K
Metallicity [Fe/H]−0.02[8] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
59 G. Telescopii[12], CD−54°8308, CPD−54°9371, FK5 1504, GC 26834, HD 182509, HIP 95690, HR 7370, SAO 246110, WDS J19278-5420A[13]
Database references
SIMBADdata

HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years.[1] It has a poorly constrained heliocentric radial velocity of −5 km/s,[6] indicating that it is drifting towards the Solar System.

HD 182509 has a stellar classification of K4 III,[4] indicating that it is a red giant. Gaia DR3 stellar evolution models place it on the red giant branch.[3] It has 1.12 times the mass of the Sun[8] but has expanded to 32.6 times its girth.[9] It shines with a luminosity of 329 L☉[10] from its enlarged photosphere at an effective temperature of 4,316 K.[9] HD 182509 iron abundance is 95% that of the Sun, placing it at solar metallicity.[8] Like most giants, it spins slowly with a projected rotational velocity of <1 km/s.[11]

HD 182466 is a high proper motion star located 76.1″ away along a position angle of 236°.[14] Eggleton and Tokovonin (2008) list the pair as a binary star.[15] However, its parallax and proper motion indicate that it is instead a foreground object.[16] Components C and D are instead faint optical background objects, while the E component is probably non-existent.[14]

  1. ^ a b c d e Cite error: The named reference EDR3 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 DR3 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Oja1970 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Mason2001 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 EDR3B was invoked but never defined (see the help page).