HD 203857
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.46[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K5[3] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: −5.825[2] mas/yr Dec.: −8.629[2] mas/yr |
| Parallax (π) | 2.6676±0.0184 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.75[1] |
| Details[5] | |
| Mass | 1.7 Template:Solar mass |
| Radius | 46-50 Template:Solar radius |
| Luminosity | 513 Template:Solar luminosity |
| Temperature | 4,080 K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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HD 203857 is a double star in the constellation Cygnus. It is near the lower limit of visibility to the naked eye, having a combined apparent visual magnitude of 6.46. The distance to the primary component is approximately 1,223 light years based on parallax, and it has an absolute magnitude of −0.75. The star is drifting closer to the Sun with a radial velocity of −6.3 km/s. It has a stellar classification of K5 and is known to be evolved. The star likely hosts an extrasolar planet, though not yet confirmed.
HD 203857 is listed in the Washington Double Star Catalogue as having five visual companions. It is separated by six arc-minutes from HD 203784, an F-type subgiant, though it is likely they are actually not gravitationally–bound.[5] HD 203784 is thought to be closer to us and less luminous than HD 203857.[7] There are also fainter stars at Script error: No such module "val". and Script error: No such module "val".. HD 203784 has a 13th-magnitude star and a 14th-magnitude star within Script error: No such module "val"..[8]
Substellar companion
Okayama Planet Search team has published a paper in late 2008 reporting investigations on radial velocity variations observed for a set of evolved stars, announcing possible detection of a substellar companion orbiting the giant star HD 203857.[5] Orbital period is estimated 2.3 years, but planet has still to be confirmed.
Template:OrbitboxPlanet begin Template:OrbitboxPlanet hypothetical
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References
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- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d e f Template:Cite Gaia DR3
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite DR2
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Template:Cite Gaia DR3
- ↑ Script error: No such module "citation/CS1".
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