| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco[1] |
| Right ascension | 12h48m 44.37261s[2] |
| Declination | +64° 51′ 19.1475″[2] |
| Apparent magnitude (V) | 9.534[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G5[4] |
| Apparent magnitude (B) | 10.16±0.03[4] |
| Apparent magnitude (V) | 9.534±0.003[3] |
| Apparent magnitude (G) | 9.376±0.003[2] |
| Apparent magnitude (J) | 8.363±0.020[4] |
| Apparent magnitude (H) | 8.088±0.018[4] |
| Apparent magnitude (K) | 8.034±0.021[4] |
| Astrometry | |
| Radial velocity (Rv) | 7.51±0.20[2] km/s |
| Proper motion (μ) | RA: 1.216 mas/yr[2] Dec.: -10.045 mas/yr[2] |
| Parallax (π) | 11.8236 ± 0.0108 mas[2] |
| Distance | 275.9 ± 0.3 ly (84.58 ± 0.08 pc) |
| Details[3] | |
| Mass | 1.022±0.027 M☉ |
| Radius | 0.968±0.036 R☉ |
| Surface gravity (log g) | 4.47±0.04 cgs |
| Temperature | 5770±50 K |
| Metallicity [Fe/H] | 0.07±0.06 dex |
| Rotation | 8.42±0.09 d[5] |
| Rotational velocity (v sin i) | 6.7±0.6 km/s |
| Age | 700±150 Myr |
| Other designations | |
BD+65 902, SAO 15908, PPM 18379, TOI-1136, TIC 142276270, TYC 4165-581-1, GSC 04165-00581, 2MASS J12484436+6451191[4] | |
| Database references | |
| SIMBAD | data |
TOI-1136 is a G-type main-sequence star 276 light-years (85parsecs) away in the constellation Draco. It is slightly smaller than the Sun and similar in mass and temperature, but is much younger, with an age of about 700 million years. It hosts a system of at least six, and possibly seven, exoplanets.[3]
TOI-1136 was discovered to have six transiting planets in 2022 using the Transiting Exoplanet Survey Satellite (TESS), all orbiting closer to their star than Mercury is to the Sun.[3] All of them are Neptune-sized or mini-Neptunes, and their masses have been measured using a combination of radial velocity and transit-timing variations, showing them to have low densities.[5] The planets are in an orbital resonance, with period ratios near 3:2, 2:1, 3:2, 7:5, and 3:2.[3]
A possible single transit of a seventh planet was also identified. This candidate planet would also be sub-Neptune-sized, but its orbit is poorly constrained. If this is confirmed, it would make TOI-1136 one of the largest known planetary systems.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 3.50+0.8 −0.7 M🜨 |
0.05106±0.0009 | 4.1727±0.0003 | 0.027±0.009 | 86.44+0.27 −0.21° |
1.90+0.21 −0.15 R🜨 |
| c | 6.32+1.1 −1.3 M🜨 |
0.0669±0.0005 | 6.2574±0.0002 | 0.11±0.01 | 89.42+0.39 −0.55° |
2.879+0.060 −0.062 R🜨 |
| d | 8.35+1.8 −1.6 M🜨 |
0.1062±0.0008 | 12.5199±0.0004 | 0.042±0.004 | 89.41±0.28° | 4.627+0.077 −0.072 R🜨 |
| e | 6.07+1.09 −1.01 M🜨 |
0.139±0.002 | 18.801±0.001 | 0.0425±0.004 | 89.31+0.26 −0.18° |
2.639+0.072 −0.088 R🜨 |
| f | 9.7+3.9 −3.7 M🜨 |
0.174±0.002 | 26.321±0.001 | 0.001±0.001 | 89.38+0.22 −0.17° |
3.88±0.11 R🜨 |
| g | 5.6+4.1 −3.2 M🜨 |
0.229±0.003 | 39.545±0.002 | 0.04±0.01 | 89.65+0.18 −0.13° |
2.53+0.11 −0.12 R🜨 |
| h (unconfirmed) | <18.8 M🜨 | ~0.36 | ~77 | 0.04+0.05 −0.03 |
89.68±0.02° | 2.68+0.20 −0.18 R🜨 |
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