XO-4
Star in the constellation Lynx / From Wikipedia, the free encyclopedia
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Not to be confused with the OLPC XO-4 from the One Laptop per Child (OLPC) initiative or the Martin XO-4.
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]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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 |
Close
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]