HD 17156
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 8.16[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F9V[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: +90.848[2] mas/yr Dec.: −33.013[2] mas/yr |
| Parallax (π) | 12.9142±0.0177 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.80[1] |
| Details | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Radius | Script error: No such module "val".[6] Template:Solar radius |
| Luminosity | 2.6[2] Template:Solar luminosity |
| Surface gravity (log g) | 4.17[2] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[7] dex |
| Age | 3.37Script error: No such module "Su".[6] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Nushagak, BD+71°171, HIP 13192, SAO 4737, GSC 04321-01320, PPM 5099, TYC 4321-1320-1, AG+71 95[8] | |
| Database references | |
| SIMBAD | data |
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HD 17156, named Nushagak by the IAU,[9] is a yellow subgiant star approximately 255 light-years away in the constellation of Cassiopeia. The apparent magnitude is 8.17, which means it is not visible to the naked eye but can be seen with good binoculars.[8] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[10]
An extrasolar planet, HD 17156 b, was discovered with the radial velocity method in 2007, and subsequently was observed to transit the star. At the time it was the transiting planet with the longest period.[11][12]
Stellar properties
The star is more massive and larger than the Sun while Its absolute magnitude of 3.70 and spectral type of G0, show that it is both hotter and more luminous. Based on asteroseismic density constraints and stellar isochrones, it was found that the age is 3.37 Script error: No such module "Su". billion years making it about two thirds as old as the Sun. Spectral observations show that the star is metal-rich.[11][6]
Name
The star was given the name Nushagak by the IAU, chosen by United States representatives for the NameExoWorlds content, with the comment that "Nushagak is a regional river near Dilingham, Alaska, which is famous for its wild salmon that sustain local Indigenous communities."[9] HD 17156 b was given the designation Mulchatna, as Mulchatna is a tributary of the Nushagak river.
Planetary system
It is the first star in Cassiopeia around which an orbiting planet was discovered (in 2007) using the radial velocity method. Later observations showed that this planet also transited the star.[12]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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See also
References
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External links
- Extrasolar Planet Interactions Template:Webarchive by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
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