Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Centaurus [1] |
Right ascension | 11h 17m 14.32361s [2] |
Declination | −41° 56′ 03.5646″ [2] |
Apparent magnitude (V) | 6.44±0.01 [3] |
Characteristics | |
Evolutionary stage | main sequence [2] |
Spectral type | A0 V [4] |
U−B color index | −0.04 [5] |
B−V color index | +0.03 [5] |
Astrometry | |
Proper motion (μ) | RA: −55.255 mas/yr [2] Dec.: −7.836 mas/yr [2] |
Parallax (π) | 9.3823±0.0298 mas [2] |
Distance | 348 ± 1 ly (106.6 ± 0.3 pc) |
Absolute magnitude (MV) | +1.35 [1] |
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, [3] 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. [2] 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. [4] 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 temperature of 9,774 K . [6] Based on parameters derived from extinction in the Gaia passband, HD 98176 has an iron abundance 19% below solar levels.