HD 154857
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ara |
| Right ascension | 17h 11m 15.72s |
| Declination | −56° 40′ 50.9″ |
| Apparent magnitude (V) | 7.25 |
| Characteristics | |
| Spectral type | G5IV-V |
| B−V color index | 0.699 ± 0.001 |
| Astrometry | |
| Radial velocity (Rv) | 27.9 ± 0.2 km/s |
| Proper motion (μ) |
RA: 87.14 ± 0.56 mas/yr Dec.: -55.92 ± 0.46 mas/yr |
| Parallax (π) | 15.57 ± 0.71mas |
| Distance | 209 ± 10 ly (64 ± 3 pc) |
| Absolute magnitude (MV) | 3.07 |
| Details | |
| Mass | 1.17 (± 0.05) M☉ |
| Radius | 2.42 R☉ |
| Luminosity | 4.61 L☉ |
| Surface gravity (log g) | 5,579844548 g cgs |
| Temperature | 5445 K |
| Metallicity | -0.23 (± 0.03) % |
| Age | 8.98 G years |
| Equatorial [ g ] | 54,7 m/s2 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
|
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
HD 154857 is a yellow main-sequence star approximately 209 light years away in the constellation of Ara.
There is one confirmed and one unconfirmed planet discovered in 2004 and 2007 respectively. The confirmed planet HD 154857 b has mass >1.8 times that of Jupiter. It orbits the star 20% further than Earth-Sun distance, taking 409 days with 47% eccentricity. The previously reported additional object (HD 154857 c) was confirmed to have planetary nature in January 2014.
Coordinates: 
17h 11m 15.7219s, −56° 40′ 50.865″
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