HD 154972
From Wikipedia, the free encyclopedia
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 17h 16m 35.64850s[1] |
| Declination | −74° 31′ 58.8407″[1] |
| Apparent magnitude (V) | 6.23±0.01[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | +0.00[4] |
| B−V color index | −0.01[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.1±2[5] km/s |
| Proper motion (μ) | RA: −23.266 mas/yr[1] Dec.: −53.910 mas/yr[1] |
| Parallax (π) | 9.6961±0.0359 mas[1] |
| Distance | 336 ± 1 ly (103.1 ± 0.4 pc) |
| Absolute magnitude (MV) | +1.11[6] |
| Details | |
| Mass | 2.56+0.39 −0.29[7] M☉ |
| Radius | 2.08±0.11[8] R☉ |
| Luminosity | 42[1] L☉ |
| Surface gravity (log g) | 4.24±0.06[7] cgs |
| Temperature | 9,772+228 −222[9] K |
| Metallicity [Fe/H] | −0.11[10] dex |
| Age | 330±2[11] Myr |
| Other designations | |
| 56 G. Apodis[12], CD−74°1187, CPD−74°1610, FK5 3398, GC 23219, HD 154972, HIP 84510, HR 6373, SAO 257478[13] | |
| Database references | |
| SIMBAD | data |
HD 154972, also known as HR 6373 or rarely 56 G. Apodis, is a solitary, bluish-white-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.23,[2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object 336 light years away,[1] and it is currently drifting closer with a heliocentric radial velocity of −3.1 km/s.[5] At its current distance, HD 154972's brightness is diminished by 0.23 magnitudes due to extinction from interstellar dust.[14] It has an absolute magnitude of +1.11.[6]
This is an ordinary A-type main-sequence star with a stellar classification of A0 V.[3] Paunzen et al. (2001) lists it as a potential λ Boötis star.[15] It has 2.56 times the mass of the Sun[7] and 2.08 times its solar radius.[8] It radiates 42 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 9,772 K.[9] It is estimated to be 330 million years old[11] and is slightly metal deficient[10] (78% solar abundance).
