HD 172555
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h 45m 26.90098s |
| Declination | −64° 52′ 16.5348″ |
| Apparent magnitude (V) | 4.77 |
| Characteristics | |
| Spectral type | A5 IV/V, A7V |
| Astrometry | |
| Radial velocity (Rv) | 2.80±0.24 km/s |
| Proper motion (μ) | RA: 31.952 mas/yr Dec.: -149.730 mas/yr |
| Parallax (π) | 34.7355±0.1575 mas |
| Distance | 93.9 ± 0.4 ly (28.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.5 |
| Details | |
| Mass | 2.0 M☉ |
| Radius | 1.52 R☉ |
| Luminosity | 9.5 L☉ |
| Temperature | 8,000 K |
| Rotational velocity (v sin i) | 175 km/s |
| Age | ~12, ~20 Myr |
| Other designations | |
| CPD−64°3948, FK5 3489, GC 25604, HD 172555, HIP 92024, HR 7012, SAO 254358 | |
| Database references | |
| SIMBAD | data |
HD 172555 is a white-hot type A7V star located relatively close by, 94 light-years from Earth in the direction of the constellation Pavo. Spectrographic evidence indicates a relatively recent collision between two planet-sized bodies. Evidence of the collision was detected by NASA's Spitzer Space Telescope.