Kepler-18
Kepler-18
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Coordinates: 
19h 63m 19.06s, +46° 44′ 47.94″
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
Constellation | Cygnus |
Right ascension | 19h 52m 19.0688s[1] |
Declination | +44° 44′ 46.808″[1] |
Apparent magnitude (V) | 14.0 |
| Astrometry | |
| Proper motion (μ) | RA: 2999856800000000000♠−1.432±0.031[1] mas/yr Dec.: 2998796870000000000♠−20.313±0.028[1] mas/yr |
| Parallax (π) | 2.2804 ± 0.0168[1] mas |
| Distance | 1,430 ± 10 ly (439 ± 3 pc) |
| Details[2] | |
| 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[3] | |
| 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]
| 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]
^ abcde 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..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
Gaia Data Release 2 catalog entry
^ ab Cochran, William D.; et al. (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:1110.0820. Bibcode:2011ApJS..197....7C. doi:10.1088/0067-0049/197/1/7.
^ "Kepler-18". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 January 2018.
External links[edit]
- Kepler-18, The Open Exoplanet Catalogue
- Kepler 18, Exoplanet.eu
Categories:
- Cygnus (constellation)
- Kepler Objects of Interest
- Planetary transit variables
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