XO-4
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 10.674 ± 0.019[3] |
| Characteristics | |
| Spectral type | F5V[3] |
| Apparent magnitude (B) | 11.240 ± 0.029[3] |
| Apparent magnitude (V) | 10.674 ± 0.019[3] |
| Apparent magnitude (J) | 9.667 ± 0.021[4] |
| Apparent magnitude (H) | 9.476 ± 0.022[4] |
| Apparent magnitude (K) | 9.406 ± 0.023[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] 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) | 3.7812±0.0156 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details[3][5] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| 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 |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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XO-4 is a star located approximately 863 light-years away from Earth in the Lynx constellation. It has a magnitude of about 11 and cannot be seen with the naked eye but is visible through a small telescope.[3] A search for a binary companion star using adaptive optics at MMT Observatory was negative.[7]
The star XO-4 is named Koit. The name was selected in the NameExoWorlds campaign by Estonia, during the 100th anniversary of the IAU. Koit is Estonian for dawn, and was named for a character in a folk tale written by Friedrich Robert Faehlmann.[8][9][10]
Planetary system
One known exoplanet, XO-4b, which is classified as a hot Jupiter, orbits XO-4. This exoplanet was discovered in 2008 by the XO Project using the transit method.[3] It has been named Hämarik, meaning dusk, and referring to a character from the same Faehlmann story featuring Koit.[11] The planetary orbit is misaligned with the stellar rotation.[12]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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Notes
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References
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- ↑ Template:Cite constellation
- ↑ a b c d e Template:Cite Gaia DR3
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External links
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