| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 07h 21m 33.1602s[2] |
| Declination | +58° 16′ 05.110″[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 | |
| Proper motion (μ) | RA: −17.008(12) mas/yr[2] Dec.: 5.463(12) mas/yr[2] |
| Parallax (π) | 3.7812 ± 0.0156 mas[2] |
| Distance | 863 ± 4 ly (264 ± 1 pc) |
| Details | |
| Mass | 1.32 ± 0.02[3] M☉ |
| Radius | 1.56 ± 0.05[3] R☉ |
| Temperature | 6397 ± 70[3] K |
| Metallicity [Fe/H] | -0.04 ± 0.03[3] dex |
| Age | 2.1 ± 0.6[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[6]
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.[7][8][9]
Roman1987 was invoked but never defined (see the help page).Gaia DR3 was invoked but never defined (see the help page).McCullough2008 was invoked but never defined (see the help page).2MASS was invoked but never defined (see the help page).SIMBAD was invoked but never defined (see the help page).Adams2013 was invoked but never defined (see the help page).