2MASS J19383260+4603591

2MASS J19383260+4603591 (also known as Kepler-451) is a binary star system with at least one known planet, Kepler-451b. The system comprises two stars, a pulsating subdwarf B star as well as a small red dwarf star.[3]

2MASS J19383260+4603591 A/B
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 38m 32.61s[1]
Declination 46h 03m 59.1s[1]
Characteristics
Spectral type sdBV/M
Astrometry
Proper motion (μ) RA: 5.23±0.04[2] mas/yr
Dec.: -4.40±0.04[2] mas/yr
Parallax (π)2.4400 ± 0.0316[2] mas
Distance1,340 ± 20 ly
(410 ± 5 pc)
Orbit[3]
Period (P)= 0.12576528 d
Details
Kepler-451 A
Mass0.48±0.03[1] [4] M☉
Radius0.223±0.004/0.158±0.003[1] [4] R☉
Temperature29564±106[1][4] K
Age6±2 Gyr
Kepler-451 B
Mass0.120±0.010 M☉
Temperatureunknown K
Other designations
Kepler-451, KIC 9472174, 2MASS J19383260+4603591[5]
Database references
SIMBADdata

Planetary system

It has at least one confirmed exoplanet, Kepler-451b, discovered in 2015[6] by the Kepler spacecraft. The discovery was disputed in 2020 though.[3]

The 2MASS J19383260+4603591 planetary system[1]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (disputed) 604±32 M🜨 0.92±0.02 416±2 — <43[3]° —

References
  1. "2MASS J19383260+4603591 b/Kepler-451 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-09.
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  3. The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields. I. Techniques and tests of the methods, 2020, arXiv:2009.02749
  4. "2MASS J19383260+4603591 system". Open Exoplanet Catalog. Retrieved 2015-10-09.
  5. "Kepler-451". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-09.
  6. Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603
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