  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 56m 16.95125s [1] |
| Declination | −42° 42′ 38.4231″ [1] |
| Apparent magnitude (V) | 5.35±0.01 [2] |
| Characteristics | |
| Spectral type | K0 III [3] or G6 III-IV [4] |
| B−V color index | +1.00 [5] |
| Astrometry | |
| Radial velocity (Rv) | −21.1±0.8 [6] km/s |
| Proper motion (μ) | RA: −27.046 mas/yr Dec.: −29.284 mas/yr |
| Parallax (π) | 10.3847±0.109 mas [1] |
| Distance | 314 ± 3 ly (96 ± 1 pc) |
| Absolute magnitude (MV) | +0.57 [7] |
| Details | |
| Mass | 1.93±0.21 [8] M☉ |
| Radius | 12.3±0.2 [8] R☉ |
| Luminosity | 76.3±2.0 [8] L☉ |
| Surface gravity (log g) | 2.55±0.07 [8] cgs |
| Temperature | 4,877±26 [8] K |
| Metallicity [Fe/H] | −0.28±0.02 [8] dex |
| Rotational velocity (v sin i) | <1 [9] km/s |
| Age | 346 [1] Myr |
| Other designations | |
| 30 G. Coronae Australis [10] , CD−42°13761, CPD−42°8539, GC 25956, HD 175219, HIP 92953, HR 7122, SAO 229383 [11] | |
| Database references | |
| SIMBAD | data |
HD 175219, also known as HR 7122, is a solitary, [12] orange hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 5.35, [2] allowing it to be faintly visible to the naked eye. The object is located relatively close at a distance of 314 light years based on Gaia DR3 parallax measurements [1] but is drifting closer with a heliocentric radial velocity of −21.1 km/s . [6] At its current distance, HD 175219's brightness is diminished by 0.26 magnitudes due to interstellar dust. [13] It has an absolute magnitude of +0.57. [7]
This is a red giant with a stellar classification of K0 III. [3] An earlier source gives it a class of G6 III-IV, [4] indicating that it is an evolved G-type star with a luminosity class intermediate between a giant star and a subgiant. At present it has nearly twice the mass of the Sun but it has expanded to 12.3 times the Sun's radius. [8] HD 175219 radiates 76.3 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,877 K . [8] The star is metal deficient, having less than half the abundance of heavy elements compared to the Sun. [8] Common for giant stars, it spins slowly, having a projected rotational velocity too low to be measured accurately. [9]
