Kepler-419

Coordinates: Sky map 19h 41m 40.3s, +51° 11′ 05.15″
Source: Wikipedia, the free encyclopedia.
Kepler-419
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 41m 40.2991s[1]
Declination +51° 11′ 05.1660″[1]
Apparent magnitude (V) 13.036±0.006[2]
Characteristics
Evolutionary stage Main sequence
Spectral type F?V[3]
Apparent magnitude (B) 13.498±0.011[2]
Distance
3,400 ± 90 ly
(1,040 ± 30 pc)
Details
Gyr
Other designations
KOI-1474, KIC 12365184, 2MASS J19414029+5111051[6]
Database references
SIMBADdata

Kepler-419 is an

Kepler Mission used to detect planets that may be transiting their stars. In 2012, a potential planetary companion in a very eccentric orbit was detected around this star,[4] but its planetary nature was not confirmed until 12 June 2014, when it was named Kepler-419b. A second planet was announced orbiting further out from the star in the same paper, named Kepler-419c.[3]

Nomenclature and history

Prior to Kepler observation, Kepler-419 had the 2MASS catalogue number 2MASS J19414029+5111051. In the Kepler Input Catalog it has the designation of KIC 12365184, and when it was found to have transiting planet candidates it was given the Kepler object of interest number of KOI-1474.

The star's planets were discovered by

transit around their stars. The transit method that Kepler uses involves detecting dips in brightness in stars. These dips in brightness can be interpreted as planets whose orbits move in front of their stars from the perspective of Earth
. The name Kepler-419 derives directly from the fact that the star is the catalogued 419th star discovered by Kepler to have confirmed planets.

The designation b and c, derive from the order of discovery. The designation of b is given to the first planet orbiting a given star, and c to the furthest.[7] In the case of Kepler-419, there were two planets detected, so the letters b and c are used.

Stellar characteristics

Kepler-419 is an

K and is 2.8 billion years old.[3] In comparison, the Sun is about 4.6 billion years old[8] and has a surface temperature of 5778 K.[9]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14. Therefore, it is too dim to be seen with the naked eye.

Planetary system

The Kepler-419 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.77±0.19 MJ 0.3745±0.0046 69.7960±0.0042 0.817±0.016 87.04±0.72° 1.120±0.084 RJ
c 7.65±0.27 MJ 1.697±0.020 673.35±0.84 0.1793±0.0017 87.0±2.0° 1.13 RJ

Only the first planet is known

inclination
relative to Earth's line of sight, or how far above or below the plane of sight it is, vary by less than one degree. This allows direct measurements of the planet's periods and relative diameters (compared to the host star) by monitoring the planet's transit of the star.

The innermost planet orbits the star every 69 days at a distance nearly the same as the Mercury–Sun distance, which Kepler-419b orbits at 0.37 AU. It has a very eccentric orbit, and as such experiences large temperature swings as its eccentricity is 0.83. The eccentric orbit could not have been caused by the star itself, there must have been a more distant companion. In 2014 the discovery of a 7.3 MJ planet orbiting at 1.68 AU was announced, through the transit-timing variations method.[3]

Kepler-419c is notable because it orbits within its star's

habitable exomoon.[11] Because of this, some astronomers have begun taking interest in Kepler-419c to search for these potentially habitable exomoons. As of 2022, no exomoons have been detected in orbit around the planet.[original research?
]

See also

  • Kepler Mission
  • List of planetary systems

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:2016yCat.2336....0H. Vizier catalog entry
  3. ^
    doi:10.1088/0004-637X/791/2/89
    .
  4. ^
    doi:10.1088/0004-637X/761/2/163
    .
  5. doi:10.1088/2041-8205/775/1/L11
    .
  6. ^ "Kepler-419". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-24.
  7. arXiv:1012.0707 [astro-ph.SR
    ].
  8. ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
  9. ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
  10. doi:10.1051/0004-6361/201732500
    .
  11. ^ Kepler 419 hpcf.upr.edu

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Kepler-419&oldid=1173225263"