Kepler-68
Kepler-68
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
Constellation | Cygnus |
Right ascension | 19h 24m 07.7651s[1] |
Declination | +49° 02′ 24.936″[1] |
Apparent magnitude (V) | 10.08[2] |
| Astrometry | |
| Proper motion (μ) | RA: 2999326300000000000♠−6.737±0.929[1] mas/yr Dec.: 2998890190000000000♠−10.981±0.694[1] mas/yr |
| Parallax (π) | 6.72 ± 0.24[1] mas |
| Distance | 490 ± 20 ly (149 ± 5 pc) |
| Details[3] | |
| Mass | 7000107900000000000♠1.079±0.051 M☉ |
| Radius | 7000124300000000000♠1.243±0.019 R☉ |
| Temperature | 7003579300000000000♠5793±74 K |
Metallicity [Fe/H] | 0.12 (± 0.074) dex |
| Rotational velocity (v sin i) | 7000240000000000000♠2.4±0.5[4] km/s |
| Age | 7000630000000000000♠6.3±1.7 Gyr |
| Other designations | |
KIC 11295426, KOI-246, TYC 3551-189-1, GSC 03551-00189, 2MASS J19240775+4902249[4] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-68 is a Sun-like main sequence star. It is known to have at least three planets orbiting around it. The outermost planet has a mass similar to Jupiter but orbits within the habitable zone.[5]
High resolution imaging observations of Kepler-68 carried out with the lucky imaging instrument AstraLux on the 2.2m telescope at Calar Alto Observatory detected a wide companion candidate approximately 11 arcseconds away. Comparing these observations to the Two Micron All-Sky Survey positions shows that the companions proper motion is consistent with it being bound to the Kepler-68 system, but further observations are needed to confirm this conclusion.[6]
Planetary system[edit]
Currently, three planets have been discovered to orbit around Kepler-68. Two of the innermost planets were discovered by planetary transit method. Follow-up Doppler measurements helped to determine the mass of Kepler-68b and helped to discover Kepler-68d. [7]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
b | 5.9 M⊕ | 0.0617 | 5.398763 | - | 87.6° | 0.196 RJ |
c | 0.015 MJ | 0.09059 | 9.605065 | - | 86.93° | 0.081 RJ |
d | ≥0.87 MJ | 1.4 | 625±16 | 0.18 | — | - RJ |
References[edit]
^ abcde Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512..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 1 catalog entry
^ Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
^ "Notes on Kepler-68 b". Retrieved 17 January 2016.
^ ab "Kepler-68". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 January 2017.
^ Gilliland, Ronald L.; et al. (2013). "Kepler-68: Three Planets, One with a Density Between That of Earth and Ice Giants". The Astrophysical Journal. 766. 40. arXiv:1302.2596. Bibcode:2013ApJ...766...40G. doi:10.1088/0004-637X/766/1/40.
^ Ginski, C.; et al. (2016). "A lucky imaging multiplicity study of exoplanet host stars – II". Monthly Notices of the Royal Astronomical Society. 457 (2): 2173–2191. arXiv:1601.01524. Bibcode:2016MNRAS.457.2173G. doi:10.1093/mnras/stw049.
^ http://astro.berkeley.edu/~gmarcy/22kois.pdf
Categories:
- Cygnus (constellation)
- Planetary transit variables
- Kepler Objects of Interest
- Planetary systems with three confirmed planets
- G-type main-sequence stars
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