Kepler-68

Kepler-68
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: −6.737±0.929[1] mas/yr
Dec.: −10.981±0.694[1] mas/yr
Parallax (π)6.72 ± 0.24[1] mas
Distance490 ± 20 ly
(149 ± 5 pc)
Details[3]
Mass1.079±0.051 M☉
Radius1.243±0.019 R☉
Temperature5793±74 K
Metallicity [Fe/H]0.12 (± 0.074) dex
Rotational velocity (v sin i)2.4±0.5[4] km/s
Age6.3±1.7 Gyr
Other designations
KIC 11295426, KOI-246, TYC 3551-189-1, GSC 03551-00189, 2MASS J19240775+4902249[4]
Database references
SIMBADdata
KICdata

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

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]

The Kepler-68 planetary system
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

  1. 1 2 3 4 5 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. Gaia Data Release 1 catalog entry
  2. ↑ 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.
  3. ↑ "Notes on Kepler-68 b". Retrieved 17 January 2016.
  4. 1 2 "Kepler-68". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 January 2017.
  5. ↑ 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.
  6. ↑ 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.
  7. ↑ http://astro.berkeley.edu/~gmarcy/22kois.pdf
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