HD 210277
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.54[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G8V[4] or G8/K0V[5] |
| U−B Template:Engvar | 0.36[6] |
| B−V Template:Engvar | 0.75[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 46.8515±0.0283 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[8] |
| Details[9] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 1.002[10] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotation | Script error: No such module "val".[11] |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val".[9] Gyr Script error: No such module "val".[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12] | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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HD 210277 is a single[11] star in the equatorial constellation of Aquarius. It has an apparent visual magnitude of 6.54,[3] which makes it a challenge to view with the naked eye, but it is easily visible in binoculars. The star is located at a distance of 69.6 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −20.9 km/s.[7]
Description
An early classification of HD 210277 was a G0 dwarf,[13] and some sources still use this value.[14] More modern classification surveys list it as G8V,[4] matching a late G-type main-sequence star.[11] It is older than the Sun with a very low level of chromospheric activity[4] and is spinning with a projected rotational velocity of 1.9 km/s. The star has a slightly higher mass and larger radius than the Sun.[9]
Planetary system
In 1999 it was announced that a dust disk orbiting HD 210277, similar to that produced by the Kuiper Belt, had been imaged, lying between 30 and 62 AU from the star.[15] However, observations with the Spitzer Space Telescope failed to detect any infrared excess at 70 micrometres or at 24 micrometres wavelengths.[16][17] Subsequent measurements by the Herschel Space Observatory did detect an excess at 100 and 160 micrometres. A model fit to the emission matches a disk orbiting at 160 AU with a mean temperature of 22 K.[18] The disk signal is fairly strong, with S/N equal to 6.6.[10]
The only known exoplanet was discovered using 34 radial velocity measurements taken from 1996 to 1998 at W. M. Keck Observatory. It has a minimum mass greater than Jupiter orbiting the star in 442 days.[11] The high eccentricity (ovalness) of the exoplanet's orbit means it is unlikely that there is a companion planet co-orbiting the star at a trojan point.[14]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet disk
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See also
References
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- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1". Originally published in: Harv. Ann. 91-100 (1918-1924)
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