Kepler-1625
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 41m 43.043s[1] |
| Declination | 39° 53′ 11.6″[1] |
| Characteristics | |
| Apparent magnitude (K) | 13.916[2] |
| Astrometry | |
| Distance | 2,182[3] pc |
| Details | |
| Mass | 1.079[3] M☉ |
| Radius | 1.793[3] R☉ |
| Surface gravity (log g) | 3.964[3] cgs |
| Temperature | 5,548[3] K |
| Metallicity [Fe/H] | +0.12[3] dex |
| Age | 4.36[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| [4][5] | |
Kepler-1625 is a 14th magnitude Sun-like star located in the constellation of Cygnus approximately 7000~8,000 light years away. It is just under 80% larger in radius than the Sun and has about 8% more mass. In 2016, it was discovered that the star is orbited by an exoplanet, Kepler-1625b, which is a gas giant orbiting within the system's habitable zone. In 2018, it was reported that this exoplanet might have an exomoon orbiting it.[6] This possibility will be verified on October 29, during the planet's next transit.
Stellar Characteristics
Kepler-1625 is a rather large star similar to our Sun. It is 1.79 times the Sun's radius yet only around 1.079 solar masses.[3] Its temperature is around 5,548 K, slightly lower than that of the Sun.[3] These parameters suggest that Kepler-1625 may be a yellow sub-giant nearing the end of its life. Kepler-1625 has a high metallicity of +0.12 dex (compared to 0.00 for the Sun) and is over 3,900 light-years away in the constellation Cygnus.[3]
There is also a secondary model for the size of Kepler-1625, which places the star at around 0.94 solar radii and 0.96 solar masses with a temperature of 5677°K and a Sun-like metal content.[2]
Planetary System
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ~3000 M⊕ | 0.811-0.8748 | 287.3789±0.0030 | — | 89.97±0.02° | 6-12 R⊕ |
The star is known to have one confirmed planet. Designated Kepler-1625b, it is a Jovian-sized planet slightly larger than Jupiter orbiting its star every 287.3 Earth days. However, if the smaller size estimate for the star is correct, then Kepler-1625b is a 6 Earth radius gas giant orbiting within the system's habitable zone.[3]
Potential exomoon
The light curves of the three observed planet transits suggest the existence of a Neptune-sized exomoon orbiting Kepler-1625b, with a separation of about 20 times the planetary radius. More observations are needed to confirm or rule out the existence of the moon. During the next planetary transit on October 29, 2018 the Hubble telescope will observe the star.[6]
Relative size and distance of Kepler-1625b and its moon Kepler-1625b-I (Planets Jupiter and Neptune are shown for comparison)
See also
- 1SWASP J140747.93-394542.6 - A large planet or small brown dwarf that may have exomoons orbiting inside several ring gaps.
- PDS 110
References
- 1 2 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C.
- 1 2 3 4 "NASA Exoplanet archive". Retrieved 2017-07-28.
- 1 2 3 4 5 6 7 8 9 10 11 Mathur, Savita; Huber, Daniel; Batalha, Natalie M.; Ciardi, David R.; Bastien, Fabienne A.; Bieryla, Allyson; Buchhave, Lars A.; Cochran, William D.; Endl, Michael; Esquerdo, Gilbert A.; Furlan, Elise; Howard, Andrew; Howell, Steve B.; Isaacson, Howard; Latham, David W.; MacQueen, Phillip J.; Silva, David R. (2017). "Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run". The Astrophysical Journal Supplement Series. 229 (2): 30. arXiv:1609.04128. Bibcode:2017ApJS..229...30M. doi:10.3847/1538-4365/229/2/30.
- ↑ NASA Exoplanet Archive, entry for Kepler-1625
- ↑ exoplanet.eu: Planet Kepler-1625 b
- 1 2 Teachey, Alex; et al. (2018). "HEK VI: On the Dearth of Galilean Analogs in Kepler and the Exomoon Candidate Kepler-1625b I". The Astronomical Journal. 155 (1). 36. arXiv:1707.08563. Bibcode:2018AJ....155...36T. doi:10.3847/1538-3881/aa93f2.
