HD 98176

HD 98176
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Centaurus
Right ascension 11h 17m 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]
Distance348 ± 1 ly
(106.6 ± 0.3 pc)
Absolute magnitude (MV)+1.35[5]
Details
Mass2.5±0.3[6] M☉
Radius2.04[7] R☉
Luminosity28.3[8] L☉
Surface gravity (log g)4.1[9] cgs
Temperature9,774+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
SIMBADdata

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 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.

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Pickles2010 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference TIC was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lafrasse2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Paunzen2001 was invoked but never defined (see the help page).