XO-2 (star)
XO-2 is a binary star system about 490 light-years (150 parsecs) away in the constellation Lynx. It consists of two components, XO-2N and XO-2S, both of which host planetary systems.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| XO-2S | |
| Right ascension | 07h 48m 07.4814s |
| Declination | +50° 13′ 03.2554″ |
| Apparent magnitude (V) | 11.12±0.03 |
| XO-2N | |
| Right ascension | 07h 48m 06.4723s |
| Declination | +50° 13′ 32.9206″ |
| Apparent magnitude (V) | 11.18±0.03 |
| Characteristics | |
| Spectral type | K0V + K0V |
| Astrometry | |
| XO-2S | |
| Radial velocity (Rv) | 46.94±0.27 km/s |
| Proper motion (μ) | RA: −29.308(15) mas/yr Dec.: −154.233(13) mas/yr |
| Parallax (π) | 6.6721 ± 0.0151 mas |
| Distance | 489 ± 1 ly (149.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 5.74 |
| XO-2N | |
| Radial velocity (Rv) | 47.45±0.44 km/s |
| Proper motion (μ) | RA: −29.552(15) mas/yr Dec.: −154.227(11) mas/yr |
| Parallax (π) | 6.6588 ± 0.0158 mas |
| Distance | 490 ± 1 ly (150.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 5.74 |
| Details | |
| XO-2S | |
| Mass | 0.98±0.05 M☉ |
| Radius | 1.02+0.09 −0.06 R☉ |
| Luminosity | 0.79±0.14 L☉ |
| Surface gravity (log g) | 4.420±0.094 cgs |
| Temperature | 5,325±37 K |
| Metallicity [Fe/H] | 0.32±0.08 dex |
| Rotation | 26.0±0.6 d |
| Rotational velocity (v sin i) | 1.5±0.3 km/s |
| Age | 7.1+2.5 −2.9 Gyr |
| XO-2N | |
| Mass | 0.96±0.05 M☉ |
| Radius | 0.998+0.033 −0.032 R☉ |
| Luminosity | 0.70±0.04 L☉ |
| Surface gravity (log g) | 4.43±0.10 cgs |
| Temperature | 5,290±18 K |
| Metallicity [Fe/H] | 0.37±0.07 dex |
| Rotation | 41.6±1.1 d |
| Rotational velocity (v sin i) | 1.07±0.09 km/s |
| Age | 7.8+1.2 −1.3 Gyr |
| Other designations | |
| XO-2S: LSPM J0748+5013S, TYC 3413-210-1, GSC 03413-00210, 2MASS J07480748+5013032 | |
| XO-2N: BD+50 1471, LSPM J0748+5013N, TOI-1720, TIC 356473034, TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328 | |
| Database references | |
| SIMBAD | XO-2S |
| XO-2N | |
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