HAT-P-17
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 21h 38m 08.733s[2] |
| Declination | +30° 29′ 19.47″[2] |
| Apparent magnitude (V) | 10.54 |
| Characteristics | |
| Spectral type | K |
| Astrometry | |
| Proper motion (μ) | RA: −78.0±0.9[2] mas/yr Dec.: −125.5±1.0[2] mas/yr |
| Distance | 90 ± 3 pc |
| Details | |
| Mass | 0.857±0.039 M☉ |
| Radius | 0.837 R☉ |
| Luminosity | 0.48±0.04 L☉ |
| Surface gravity (log g) | 4.53±0.02[3] cgs |
| Temperature | 5345±70[3] K |
| Metallicity | 0.06±0.08[3] |
| Rotational velocity (v sin i) | 1.3±1.0[3] km/s |
| Age | 7.8±3.3 Gyr |
| Other designations | |
|
GSC 2717-00417
|
|
HAT-P-17 is a K-type main-sequence star about 90 ± 3 parsecs (293.5 ± 9.8 ly) away. It has a mass of about 0.857 ± 0.039 M☉. It is the host of two planets, HAT-P-17b and HAT-P-17c, both discovered in 2012.[4] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[5]
Planetary system
In 2012 a multi-planet system consisting of a transiting hot Saturn in an eccentric orbit and a Jupiter like planet in an outer orbit. The transiting planet HAT-P-17b was detected by the HATNet Project using telescopes located in Hawaii, Arizona and at Wise Observatory in Israel. It was confirmed with radial velocity measurements taken at the Keck telescope which also lead to the discovery of the second planet on a much wider orbit.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.532+0.018 −0.017 MJ |
0.0882±0.0014 | 10.338523+0.000088 −0.000089 |
0.3422±0.0046 | 89.3+0.18 −0.17° |
1.010±0.029 RJ |
| c | > 3.4+1.1 −0.7 MJ |
5.6+3.5 −1.4 |
5584+7700 −2100 |
0.39+0.23 −0.17 |
— | — |
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found. Vizier query form
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.Vizier catalog entry
- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
Coordinates: 
21h 38m 09s, +30° 29′ 19″
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