HD 193002

HD 193002
Location of HD 193002 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 20h 20m 32.31401s[1]
Declination −55° 03′ 03.1837″[1]
Apparent magnitude (V) 6.26±0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0/1 III[4]
U−B color index +2.01[5]
B−V color index +1.59[5]
Variable type suspected[6]
Astrometry
Radial velocity (Rv)−9.1±0.4[7] km/s
Proper motion (μ) RA: +9.106 mas/yr[1]
Dec.: −33.290 mas/yr[1]
Parallax (π)3.1785 ± 0.0411 mas[1]
Distance1,030 ± 10 ly
(315 ± 4 pc)
Absolute magnitude (MV)−0.93[8]
Details
Mass1.08[9] M☉
Radius84.5±4.3[10] R☉
Luminosity711[11] L☉
Surface gravity (log g)0.87[9] cgs
Temperature3,972±122[12] K
Metallicity [Fe/H]+0.07[9] dex
Other designations
85 G. Telescopii[13], NSV 25094, CPD−55°9365, FK5 3626, GC 28241, HD 193002, HIP 100300, HR 7758, SAO 246535[14]
Database references
SIMBADdata

HD 193002 (HR 7758; NSV 25094) is a solitary red hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.26,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 1,030 light years based on Gaia DR3 parallax measurements,[1] but it is approaching the Solar System with a heliocentric radial velocity of −9.1 km/s.[7] At its current distance, HD 193002's brightness is diminished by 0.17 magnitudes due to interstellar dust[15] and it has an absolute magnitude of −0.93.[8]

A light curve for HD 193002, plotted from Hipparcos data[16]

HD 193002 has a stellar classification of M0/1 III,[4] indicating that it is an evolved red giant with the characteristics of an M0 and M1 giant star. It is currently on the asymptotic giant branch,[3] generating fusion via hydrogen and helium shells around an inert carbon core. It has a comparable mass to the Sun[9] but it has expanded to 84.5 times the radius of the Sun.[10] It radiates 711 times the luminosity of the Sun[11] from its enlarged photosphere at an effective temperature of 3,972 K.[12] HD 193002 is slightly metal enriched with an iron abundance 118% that of the Sun's or [Fe/H] = +0.07.[9]

HD 193002 was first suspected to be variable in 1997 by the Hipparcos satellite.[17] It fluctuates between 6.34 and 6.39 in the Hipparcos passband.[6]

  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 Eggen1992 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 Samus2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Stassun2019 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 Gontcharov2017 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Perryman1997 was invoked but never defined (see the help page).