XO-4
XO-4 is a star located approximately 896 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. A search for a binary companion star using adaptive optics at MMT Observatory was negative.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 07h 21m 33.1602s |
| Declination | +58° 16′ 05.112″ |
| Apparent magnitude (V) | 10.674 ± 0.019 |
| Characteristics | |
| Spectral type | F5V |
| Apparent magnitude (B) | 11.240 ± 0.029 |
| Apparent magnitude (V) | 10.674 ± 0.019 |
| Apparent magnitude (J) | 9.667 ± 0.021 |
| Apparent magnitude (H) | 9.476 ± 0.022 |
| Apparent magnitude (K) | 9.406 ± 0.023 |
| Astrometry | |
| Proper motion (μ) | RA: −16.989±0.056 mas/yr Dec.: 5.310±0.050 mas/yr |
| Parallax (π) | 3.6392 ± 0.0385 mas |
| Distance | 896 ± 9 ly (275 ± 3 pc) |
| Details | |
| Mass | 1.32 ± 0.02 M☉ |
| Radius | 1.56 ± 0.05 R☉ |
| Temperature | 6397 ± 70 K |
| Metallicity [Fe/H] | -0.04 ± 0.03 dex |
| Age | 2.1 ± 0.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
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