Kepler-19

Kepler-19 (TYC 3134-1549-1, 2MASS J19214099+3751064, GSC 03134-01549, KOI-84)^[4] is a G7V star that is host to three known planets - Kepler-19b, Kepler-19c, and Kepler-19d. It is located about 720 light-years (220 parsecs) away in the constellation Lyra, five arcminutes northwest of the much more distant open cluster NGC 6791.

Kepler-19

Observation data Epoch J2000      Equinox J2000
Constellation	Lyra
Right ascension	19h 21m 40.99950s[1]
Declination	+37° 51′ 06.4373″[1]
Apparent magnitude (V)	12.04[2]
Astrometry
Radial velocity (Rv)	−11.36±0.53[1] km/s
Proper motion (μ)	RA: 25.349 mas/yr[1] Dec.: −30.792 mas/yr[1]
Parallax (π)	4.5296 ± 0.0087 mas[1]
Distance	720 ± 1 ly (220.8 ± 0.4 pc)
Details
Mass	0.936±0.04[3] M☉
Radius	0.859±0.018[3] R☉
Surface gravity (log g)	4.54[4] cgs
Temperature	5541±60[3] K
Metallicity [Fe/H]	−0.13±0.06[3] dex
Rotational velocity (v sin i)	1.8±0.5[5] km/s
Age	1.9±1.7[3] Gyr
Other designations
KIC 2571238, KOI-84, TYC 3134-1549-1, GSC 03134-01549, 2MASS J19214099+3751064, Gaia DR2 2051106987063242880[4]
Database references
SIMBAD	data
KIC	data

Planetary system

There are three known planets in the Kepler-19 planetary system. Planet b was discovered by the transit method, c by transit-timing variations^[6] and d by radial velocity measurements.^[7]

The Kepler-19 planetary system^[7][3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	8.4+1.6 −1.5 M🜨	0.0846±0.0012	9.2869900	0.12±0.02	89.94+0.06 −0.44°	2.209±0.048 R🜨
c	13.1±2.7 M🜨	—	28.731+0.012 −0.005	0.21+0.05 −0.07	—	—
d	22.5+1.2 −5.6 M🜨	—	62.95+0.04 −0.30	0.05+0.16 −0.01	—	—

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
3. Bonomo, A. S.; Dumusque, X.; et al. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". Astronomy & Astrophysics. arXiv:2304.05773. Bibcode:2023A&A...677A..33B. doi:10.1051/0004-6361/202346211. S2CID 258078829.
4. "KOI-84". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017.
5. Buchhave, Lars A.; et al. (2012). "An abundance of small exoplanets around stars with a wide range of metallicities". Nature. 486 (7403): 375–377. Bibcode:2012Natur.486..375B. doi:10.1038/nature11121. PMID 22722196. S2CID 4427321.
6. Ballard, Sarah; et al. (2011). "The Kepler-19 System: A Transiting 2.2R_🜨 Planet and a Second Planet Detected Via Transit Timing Variations". The Astrophysical Journal. 743 (2). 200. arXiv:1109.1561. Bibcode:2011ApJ...743..200B. doi:10.1088/0004-637X/743/2/200.
7. Malavolta, Luca; et al. (2017). "The Kepler-19 System: A Thick-envelope Super-Earth with Two Neptune-mass Companions Characterized Using Radial Velocities and Transit Timing Variations". The Astronomical Journal. 153 (5). 224. arXiv:1703.06885. Bibcode:2017AJ....153..224M. doi:10.3847/1538-3881/aa6897.

External links

• NASA, Kepler mission, Table of Confirmed Planets