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Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 41m 43.0402s[1]
Declination 39° 53′ 11.4990″[1]
Apparent magnitude (K) 13.916[2]
Proper motion (μ) RA: −2.145±0.064[1] mas/yr
Dec.: −4.799±0.068[1] mas/yr
Parallax (π)0.4065 ± 0.0358[1] mas
Distance8,000 ± 700 ly
(2,500 ± 200 pc)
Mass1.079[3] M
Radius1.793[3] R
Surface gravity (log g)3.964[3] cgs
Temperature5,548[3] K
Metallicity [Fe/H]+0.12[3] dex
Age4.36[2] Gyr
Other designations
KIC 4760478, KOI 5084, 2MASS J19414304+3953115
Database references
Data sources:

Kepler-1625 is a 14th magnitude Sun-like star located in the constellation of Cygnus approximately 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[edit]

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 approximately 8,000 light-years away[1] 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[edit]

The Kepler-1625 planetary system[2] [3]
(in order from star)
Mass Semimajor axis
Orbital period
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[edit]

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]

See also[edit]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d "NASA Exoplanet archive". Retrieved 2017-07-28.
  3. ^ a b c d e f g h i j 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.
  4. ^ NASA Exoplanet Archive, entry for Kepler-1625
  5. ^ Planet Kepler-1625 b
  6. ^ a b 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.

Coordinates: Sky map 19h 41m 43.04s, +39° 53′ 11.6″