Kepler-1229b

Coordinates: Sky map 19h 49m 56.81s, +46° 59′ 48.2″
Source: Wikipedia, the free encyclopedia.
Kepler-1229b
Kepler spacecraft
Discovery dateMay 12, 2016
transit
Orbital characteristics
0.2896 AU (43,320,000 km)[nb 1]
Eccentricity~0
86.829[1] d
Inclination~89.5
StarKepler-1229 (KOI-2418)
Physical characteristics
Mean radius
1.40+0.11
−0.13[2][nb 2] R🜨
Mass~2.7[3] ME
Temperature213 K (−60 °C; −76 °F)

Kepler-1229b

Kepler space telescope.[5] The exoplanet was found by using the transit method
, in which the dimming effect that a planet causes as it crosses in front of its star is measured.

Physical characteristics

Mass, radius and temperature

Kepler-1229b is likely a rocky

equilibrium temperature of 213 K (−60 °C; −76 °F).[3]

Host star

Main article: Kepler-1229

The planet orbits a (

K and is about 3.72 billion years old.[2] In comparison, the Sun is 4.6 billion years old[6] and has a temperature of 5778 K.[7]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 15.474. Therefore, it is too dim to be seen with the naked eye.

Orbit

Kepler-1229b orbits its host star with about 4% of the Sun's luminosity every 86.829 days at a distance of 0.2896 AU (close to that of Mercury, which orbits at a distance of 0.387 AU).

Habitability

See also: Habitability of red dwarf systems

The exoplanet, along with eight others, was announced to be orbiting in the habitable zone of its parent star, the region where, with the correct conditions and atmospheric properties, liquid water may exist on the surface of the planet.[5] Kepler-1229b has a radius of 1.4 R🜨, so it is likely rocky. Its host star is a red dwarf, with about half as much mass than the Sun does. As a result, stars like Kepler-1229 have the ability to live up to 50–60 billion years, 5–6 times longer than the Sun will live.[8]

The planet is likely tidally locked,[

terminator line
, where the temperatures may be suitable (about 273 K (0 °C; 32 °F)) for liquid water to exist. Additionally, a much larger portion of the planet may be habitable if it supports a thick enough atmosphere to transfer heat to the side facing away from the star.

Discovery and follow-up studies

In 2013, before the two wheels failed,

transit events, in which a planet crosses in front of and dims its host star for a brief and near-regular period of time. In this last test, Kepler observed 50000 stars in the Kepler Input Catalog, including Kepler-1229; the preliminary light curves were sent to the Kepler science team for analysis, who chose obvious planetary companions from the bunch for follow-up at observatories. The radial velocity observations confirmed that a planetary body was responsible for the dips observed in Kepler-1229's light curve, thus confirming it as a planet. The planet was then announced in the newest catalog released by NASA on May 12, 2016, about 3 years later.[9]

At nearly 770 light-years (236 pc) distant, Kepler-1229b is too remote and its star too far for current telescopes or the next generation of planned telescopes to determine its mass or whether it has an atmosphere. The Kepler spacecraft focused on a single small region of the sky but next-generation planet-hunting space telescopes, such as

Square Kilometer Array would significantly improve radio observations over the Arecibo Observatory and Green Bank Telescope.[10]

See also

Notes

  1. ^ Kepler's Third Law, assuming a circular orbit: Mass and the period are known, so the equation can be written with semimajor axis as the subject: .
  2. ^ The 1.40 Earth radius was taken from a data set of confirmed Kepler planets, updated by NASA in 10 May 2016. The Morton et al. 2016 (version 1) paper actually used an older data set for Kepler candidate planets that, at the time, was only updated back in 18 September 2015 but that data set gave a different value of 1.12 Earth radius for the planet, along with different mass, radius and temperature for the star.

References

  1. ^
    S2CID 20832201
    .
  2. ^ a b c "Kepler-1229 b". NASA Exoplanet Science Institute. 10 May 2016. Retrieved 2016-05-11.
  3. ^ a b "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". Retrieved 27 June 2016.
  4. ^ Prostak, Sergio (11 May 2016). "Astronomers Confirm 1,284 New Kepler Exoplanets". NASA. Sci News. Retrieved 2016-05-11.
  5. ^ a b 1st Alien Earth Still Elusive Despite Huge Exoplanet Haul, Mike Wall, Space.com
  6. ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
  7. ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
  8. Bibcode:2004RMxAC..22...46A
    .
  9. ^ Northon, Karen (10 May 2016). "Kepler Mission Announces Largest Planet Collection Ever Discovered". Retrieved 27 June 2016.
  10. S2CID 119302350
    .


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