HD 142245
Triple star system in the constellation Serpens
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HD 142245 is a hierarchical triple star system about 318 light-years away.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | 15h 52m 56.28008s[2] |
| Declination | +15° 25′ 50.5379″[2] |
| Apparent magnitude (V) | 7.45[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4] |
| Spectral type | K0IV+M1[5] |
| Astrometry | |
| Radial velocity (Rv) | 6.92 km/s |
| Proper motion (μ) | RA: −57.312[2] mas/yr Dec.: −21.641[2] mas/yr |
| Parallax (π) | 10.2374±0.0224 mas[2] |
| Distance | 318.6 ± 0.7 ly (97.7 ± 0.2 pc) |
| Absolute magnitude (MV) | +2.27[1] |
| Orbit | |
| Primary | HD 142245 A |
| Secondary | HD 142245 BC |
| Semi-major axis (a) | 2.5" (237 AU[6]) |
| Details[7] | |
| HD 142245 A | |
| Mass | 1.52±0.05[5] M☉ |
| Radius | 4.8±0.1[8] R☉ |
| Luminosity | 11.4[8] L☉ |
| Surface gravity (log g) | 3.21±0.14 cgs |
| Temperature | 4,838±36[9] K |
| Metallicity | 0.20±0.02[9] |
| Age | 2.855±0.514 Gyr |
| HD 142245 BC | |
| Mass | 0.56[6] M☉ |
| Other designations | |
| BD+15 2925, HD 142245, HIP 77783, TYC 1496-1841-1, 2MASS J15525629+1525507, Gaia DR2 1193193836691820032[10] | |
| Database references | |
| SIMBAD | data |
The primary subgiant star HD 142245 A belongs to the spectral class of K0. Its age is much younger than Sun`s at 2.855±0.514 billion years.[9] The primary star is slightly enriched by heavy elements, having 160% of solar abundance.[9]
In 2014, the co-moving binary stellar companion HD 142245 BC was detected. It consists of pair of red dwarf stars with composite spectral class M1, orbiting each other on 4 AU orbit.[6]
No other stellar companions were found at projected separations from 5.48 to 153.34 AU around HD 142245 A.[5]
Planetary system
In 2011 one superjovian planet HD 142245 A b on a mildly eccentric orbit around star HD 142245 A was discovered utilizing the radial velocity method.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| HD 142245 A b | ≥1.9±0.2 MJ | 2.77±0.09 | 1299±48 | 0.32 | — | — |