Kepler-18

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Coordinates: Sky map 19h 63m 19.06s, +46° 44′ 47.94″

Kepler-18
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 52m 19.067s[1]
Declination +46° 44′ 46.94″[1]
Apparent magnitude (V) 14.0
Astrometry
Distance 1376+147
−176
[2] ly
(421.9+45.0
−54.0
[2] pc)
Details[3]
Mass 0.972 ± 0.042 M
Radius 1.108 ± 0.051 R
Luminosity 0.93 L
Surface gravity (log g) 4.32 ± 0.12 cgs
Temperature 5383 ± 44 K
Metallicity [Fe/H] 0.19 ± 0.06 dex
Rotational velocity (v sin i) <4 km/s
Age 10.0 ± 2.3 Gyr
Other designations
KOI-137, KIC 8644288[4]
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

Kepler-18 is a star with almost the same mass as the Sun in the Cygnus constellation with 3 confirmed planets, announced in 2011.

Planetary system[edit]

The Kepler-18 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 6.9 ± 3.4 M 0.0447 ± 0.0006 3.504725 ± 0.000028 84.92 ± 0.26° 2.00 ± 0.10 R
c 17.3 ± 1.9 M 0.0752 ± 0.0011 7.64159 ± 0.00003 87.68 ± 0.22° 5.49 ± 0.26 R
d 16.4 ± 1.4 M 0.1172 ± 0.0017 14.85888 ± 0.00004 88.07 ± 0.1° 6.98 ± 0.33 R

References[edit]

  1. ^ a b Zacharias, N. (2009). "Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3)". VizieR On-line Data Catalog. 1315. Bibcode:2009yCat.1315....0Z. 
  2. ^ a b Wang, Ji; et al. (2015). "Influence of Stellar Multiplicity on Planet Formation. III. Adaptive Optics Imaging Of Kepler stars with Gas Giant Planets". The Astrophysical Journal. 806 (2): 248. arXiv:1505.05363Freely accessible. Bibcode:2015ApJ...806..248W. doi:10.1088/0004-637X/806/2/248. 
  3. ^ a b Cochran, William D. (2011). "Kepler 18-b, c, and d: A System Of Three Planets Confirmed by Transit Timing Variations, Lightcurve Validation, Spitzer Photometry and Radial Velocity Measurements". The Astrophysical Journal Supplement Series. 197: 7. arXiv:1110.0820Freely accessible. Bibcode:2011ApJS..197....7C. doi:10.1088/0067-0049/197/1/7. 
  4. ^ "Kepler-18". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 January 2018. 

External links[edit]