Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 15h 52m 56.2803s [1] |
Declination | +15° 25′ 50.5399″ [1] |
Apparent magnitude (V) | 7.45 |
Characteristics | |
Evolutionary stage | subgiant |
Spectral type | K0IV+M1 [2] |
Astrometry | |
Radial velocity (Rv) | 6.92 km/s |
Proper motion (μ) |
RA: -57.477
mas/
yr Dec.: -21.764 mas/ yr |
Parallax (π) | 10.2562 ± 0.0411 mas [3] |
Distance | 318 ± 1
ly (97.5 ± 0.4 pc) |
Orbit | |
Primary | HD 142245 A |
Companion | HD 142245 BC |
Semi-major axis (a) | 2.5" (237 AU [4]) |
Details [5] | |
HD 142245 A | |
Mass | 1.52±0.05 [2] M☉ |
Radius | 4.8±0.1 [6] R☉ |
Luminosity | 11.4 [6] L☉ |
Surface gravity (log g) | 3.21±0.14 cgs |
Temperature | 4838±36 [7] K |
Metallicity | 0.20±0.02 [7] |
Age | 2.855±0.514 Gyr |
HD 142245 BC | |
Mass | 0.56 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
HD 142245 is a hierarchical triple star system about 318 light-years away.
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. [7] The primary star is slightly enriched by heavy elements, having 160% of solar abundance. [7]
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. [4]
No other stellar companions were found at projected separations from 5.48 to 153.34 AU around HD 142245 A. [2]
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. [8]
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 | — | — |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 15h 52m 56.2803s [1] |
Declination | +15° 25′ 50.5399″ [1] |
Apparent magnitude (V) | 7.45 |
Characteristics | |
Evolutionary stage | subgiant |
Spectral type | K0IV+M1 [2] |
Astrometry | |
Radial velocity (Rv) | 6.92 km/s |
Proper motion (μ) |
RA: -57.477
mas/
yr Dec.: -21.764 mas/ yr |
Parallax (π) | 10.2562 ± 0.0411 mas [3] |
Distance | 318 ± 1
ly (97.5 ± 0.4 pc) |
Orbit | |
Primary | HD 142245 A |
Companion | HD 142245 BC |
Semi-major axis (a) | 2.5" (237 AU [4]) |
Details [5] | |
HD 142245 A | |
Mass | 1.52±0.05 [2] M☉ |
Radius | 4.8±0.1 [6] R☉ |
Luminosity | 11.4 [6] L☉ |
Surface gravity (log g) | 3.21±0.14 cgs |
Temperature | 4838±36 [7] K |
Metallicity | 0.20±0.02 [7] |
Age | 2.855±0.514 Gyr |
HD 142245 BC | |
Mass | 0.56 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
HD 142245 is a hierarchical triple star system about 318 light-years away.
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. [7] The primary star is slightly enriched by heavy elements, having 160% of solar abundance. [7]
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. [4]
No other stellar companions were found at projected separations from 5.48 to 153.34 AU around HD 142245 A. [2]
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. [8]
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 | — | — |