| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 46m 58.1130s |
| Declination | +34° 25′ 10.288″ |
| Apparent magnitude (V) | 7.89 |
| Distance | 156.28 ly (47.92 pc) |
| Spectral type | G5V |
| Other designations | |
HD 187123 is an 8th magnitude G-type main sequence star located approximately 156 light-years away in the constellation of Cygnus. Like our Sun, it is a yellow dwarf (spectral type G5V). Being at a distance of about 160 light-years it is not visible to the unaided eye. However, it should be easy target with binoculars or small telescope.
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In 1998 the California and Carnegie Planet Search team, after following a suggestion by Kevin Apps, a Briton who at the time was an undergraduate student[1] found a possible planet orbiting the star.[2] There were also indications of another, more distant body orbiting the star and this claim was published in 2006.[3] This planet was confirmed in 2009.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | ≥ 0.523 ± 0.043 MJ | 0.0426 ± 0.0025 | 3.0965828 ± 0.0000078 | 0.0103 ± 0.0059 |
| c | ≥ 1.99 ± 0.25 MJ | 4.89 ± 0.53 | 3810 ± 420 | 0.252 ± 0.033 |