HD 167096
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 15m 53.45211s[1] |
| Declination | −44° 12′ 23.2322″[1] |
| Apparent magnitude (V) | 5.45±0.01[2] |
| Characteristics | |
| Spectral type | G8/K0 III[3] |
| B−V color index | +0.96[4] |
| Astrometry | |
| Radial velocity (Rv) | −27±13.7[5] km/s |
| Proper motion (μ) | RA: +67.283 mas/yr[1] Dec.: +12.211 mas/yr[1] |
| Parallax (π) | 14.5746±0.4724 mas[1] |
| Distance | 224 ± 7 ly (69 ± 2 pc) |
| Absolute magnitude (MV) | +0.64[6] |
| Orbit[7] | |
| Period (P) | 1.811595±0.102779 yr |
| Semi-major axis (a) | 8.1±0.9 mas |
| Eccentricity (e) | 0.00 |
| Details | |
| A | |
| Mass | 1.11±0.51[8] M☉ |
| Radius | 8.92±0.45[9] R☉ |
| Luminosity | 32.4±0.7[10] L☉ |
| Surface gravity (log g) | 2.51±0.46[8] cgs |
| Temperature | 4,886±123[11] K |
| Metallicity [Fe/H] | −0.02[12] dex |
| Rotational velocity (v sin i) | <1.6[13] km/s |
| Other designations | |
| 4 G. Coronae Australis[14], CD−44°12456, CPD−44°9034, GC 24892, HD 167096, HIP 89507, HR 6818, SAO 228854, WDS 18159-4412[15] | |
| Database references | |
| SIMBAD | data |
HD 167096, also known as HR 6818 or rarely 4 G. Coronae Australis, is a binary star[16] located in the southern constellation Corona Australis. It has an apparent magnitude of 5.45,[2] making it faintly visible to the naked eye. The system is located relatively close at a distance of 224 light years based on Gaia DR3 parallax measurements[1] but is drifting closer with a poorly constrained heliocentric radial velocity of −27 km/s.[5] At its current distance HD 167096's brightness is diminished by three tenths of a magnitudes due to interstellar dust[17] and it has an absolute magnitude of +0.64.[6]
The primary has a stellar classification of G8/K0 III,[3] indicating that it is an evolved red giant with the characteristics of a G8 and K0 giant star. It has 1.11 times the mass of the Sun[8] but it has expanded to 8.92 times the Sun's radius.[9] It radiates 32.4 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 4,886 K,[11] giving it an orangish-yellow hue. It has a near solar metallicity at [Fe/H] = −0.02[12] and spins too slowly for its projected rotational velocity to be measured accurately. This is a binary star that completes a circular orbit within 1.81 years.[7] Since the two components have a separation of only 8.1 mas, it makes it difficult to measure their individual properties.[7]
