HD 142527
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 56m 41.88986s |
| Declination | −42° 19′ 23.2746″ |
| Apparent magnitude (V) | 8.34 |
| Characteristics | |
| Spectral type | F6 III |
| Astrometry | |
| Radial velocity (Rv) | -3.10 km/s |
| Proper motion (μ) | RA: -11.19 mas/yr Dec.: -24.46 mas/yr |
| Parallax (π) | 6.2791±0.0284 mas |
| Distance | 519 ± 2 ly (159.3 ± 0.7 pc) |
| Details | |
| HD 142527 A | |
| Mass | 2.2±0.05 M☉ |
| Radius | 3.46±0.13 R☉ |
| Luminosity | 22.39±0.52 L☉ |
| Surface gravity (log g) | 3.15 cgs |
| Temperature | 6632 K |
| Metallicity [Fe/H] | 0.33 dex |
| Age | 4.4+0.49 −0.38 Myr |
| HD 142527 B | |
| Mass | 0.34±0.06 M☉ |
| Radius | 1.37±0.05 R☉ |
| Luminosity | 0.25±0.04 L☉ |
| Temperature | 3500±100 K |
| Age | 1.8+1.2 −-0.5 Myr |
| Orbit | |
| Primary | HD 142527 A |
| Companion | HD 142527 B |
| Period (P) | 23.50±0.85 yr |
| Semi-major axis (a) | 0.0678±0.014" (10.80±0.22 AU) |
| Eccentricity (e) | 0.47±0.01 |
| Inclination (i) | 149.47±0.71° |
| Longitude of the node (Ω) | 161.51±2.01° |
| Periastron epoch (T) | 2020.42±0.05 |
| Argument of periastron (ω) (secondary) | 186.45±0.48° |
| Other designations | |
| CD−41°10447, HD 142527, HIP 78092, SAO 226389, WDS J15567-4219AB, 2MASS J15564188-4219232, TYC 846-688-1, Gaia DR2 5994826707951507200 | |
| Database references | |
| SIMBAD | data |
HD 142527 is a binary star system in the constellation of Lupus. The primary star belongs to the Herbig Ae/Be star class, while the companion, discovered in 2012, is a red dwarf star or accreting protoplanet with a projected separation of less than 0.1″. The system is notable for its circumbinary protoplanetary disk and its discovery has helped refine models of planet formation. The orbit of companion is strongly inclined to the circumbinary protoplanetary disk.
HD 142527 is listed in the International Variable star index as a UX Orionis variable, with a visible-light magnitude ranging from 8.27 to 8.60.