XO-3
Star in the constellation Camelopardalis
From Wikipedia, the free encyclopedia
XO-3 is a star 670 light-years (210 parsecs) away in the constellation Camelopardalis. The star has a magnitude of 10 and is not visible to the naked eye but is visible through a small telescope.[3] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 04h 21m 52.7048s[2] |
| Declination | +57° 49′ 01.889″[2] |
| Apparent magnitude (V) | 9.80 ± 0.03[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F5V[3] |
| Apparent magnitude (B) | 10.25 ± 0.03[3] |
| Apparent magnitude (V) | 9.80 ± 0.03[3] |
| Apparent magnitude (J) | 9.013 ± 0.029[4] |
| Apparent magnitude (H) | 8.845 ± 0.018[4] |
| Apparent magnitude (K) | 8.791 ± 0.019[4] |
| Astrometry | |
| Radial velocity (Rv) | −11.14±0.47[2] km/s |
| Proper motion (μ) | RA: −2.721(27) mas/yr[2] Dec.: 4.186(23) mas/yr[2] |
| Parallax (π) | 4.8687±0.0261 mas[2] |
| Distance | 670 ± 4 ly (205 ± 1 pc) |
| Details[5] | |
| Mass | 1.449+0.056 −0.058 M☉ |
| Radius | 1.523±0.027 R☉ |
| Luminosity | 4.92+0.40 −0.34 L☉ |
| Surface gravity (log g) | 4.234+0.013 −0.014 cgs |
| Temperature | 6970+110 −100 K |
| Metallicity [Fe/H] | −0.159+0.058 −0.069 dex |
| Rotational velocity (v sin i) | 18.63±0.24 km/s |
| Age | 0.97+0.36 −0.29 Gyr |
| Other designations | |
| XO-3, BD+57 793, TOI-1676, TIC 8400842, TYC 3727-1064-1, GSC 03727-01064, 2MASS J04215269+5749018[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Planetary system
In 2007, the gas giant exoplanet XO-3b was discovered by the XO Telescope using the transit method. This object may be classified as a brown dwarf because of its high mass, near the ~13 MJ limit for deuterium fusion.[3][8] The planetary orbit is misaligned with the stellar rotation,[9][10] which is unusual for such a massive planet.[5] The misalignment may be due to an undetected companion star.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 13.27+0.35 −0.36 MJ |
0.04815+0.00061 −0.00065 |
3.19152309(14) | 0.2791+0.0024 −0.0022 |
83.66±0.17° | 1.320±0.025 RJ |
