| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h17m 14.32361s[1] |
| Declination | −41° 56′ 03.5646″[1] |
| Apparent magnitude (V) | 6.44±0.01[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.04[4] |
| B−V color index | +0.03[4] |
| Astrometry | |
| Proper motion (μ) | RA: −55.255 mas/yr[1] Dec.: −7.836 mas/yr[1] |
| Parallax (π) | 9.3823 ± 0.0298 mas[1] |
| Distance | 348 ± 1 ly (106.6 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.35[5] |
| Details | |
| Mass | 2.5±0.3[6] M☉ |
| Radius | 2.04[7] R☉ |
| Luminosity | 28.3[8] L☉ |
| Surface gravity (log g) | 4.1[9] cgs |
| Temperature | 9,774+157 −220[6] K |
| Metallicity [Fe/H] | −0.09[10] dex |
| Other designations | |
22 G. Centauri[11], CD− 41°6450, CPD−41°5248, GC 15525, HD 98176, HIP 55133, SAO 222695[12] | |
| Database references | |
| SIMBAD | data |
HD 98176, also designated as HIP 55133 and rarely 22 G. Centauri, is a solitary, white hued star located in the southern constellation Centaurus. It has an apparent magnitude of 6.44,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 348 light years distant.[1] At its current distance, its brightness is diminished by 0.32 magnitudes due to interstellar dust.[13] Pauzen et al. (2001) lists it as a potential λ Boötis star.[14]
This is an ordinary A-type main-sequence star with a stellar classification of A0 V.[3] Pauzen et al. (2001) gives it a slightly cooler class of A1 Vn,[14] which includes broad absorption lines due to rapid rotation. It has 2.5 times the mass of the Sun[6] and double its radius.[7] It radiates 28.3 times the luminosity of the Sun[8] from its photosphere at an effective temperatureof9,774 K.[6] Based on parameters derived from extinction in the Gaia passband, HD 98176 has an iron abundance 19% below solar levels.
