HD 193002
From Wikipedia, the free encyclopedia
  | |
| 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] |
| Distance | 1,030 ± 10 ly (315 ± 4 pc) |
| Absolute magnitude (MV) | −0.93[8] |
| Details | |
| Mass | 1.08[9] M☉ |
| Radius | 84.5±4.3[10] R☉ |
| Luminosity | 711[11] L☉ |
| Surface gravity (log g) | 0.87[9] cgs |
| Temperature | 3,972±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 | |
| SIMBAD | data |
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]
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]
