XO-4
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 07h 21m 33.159s[2] |
| Declination | +58° 16′ 04.98″[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: -18.1 ± 2.9[2] mas/yr Dec.: -4.0 ± 2.9[2] mas/yr |
| Distance | 956 ± 62[3] ly (293 ± 19[3] 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 | |
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XO-4 is a star located approximately 960 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 One Laptop per Child (OLPC) is a non-profit initiative MMT Observatory was negative.[6]
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 Telescope project using the transit method.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| XO-4b | 1.72 ± 0.20 MJ | 0.0552 ± 0.0003 | 4.1250823 ± 0.0000039 | 0(assumed) [note 1] | — | — |
Notes
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Coordinates: 
07h 21m 33.1657s, +58° 16′ 05.005″
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