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definition - HR 8799 c

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HR 8799 c

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HR 8799 c
Extrasolar planetList of extrasolar planets

Size comparison of HR 8799 c (gray) with Jupiter.
Parent star
StarHR 8799
ConstellationPegasus
Right ascension(α)23h 07m 28.7150s[1]
Declination(δ)+21° 08′ 03.302″[1]
Apparent magnitude(mV)5.964[1]
Distance129 ± 4[2][note 1] ly
(39 ± 1[2][note 1] pc)
Spectral typekA5 hF0 mA5 V; λ Boo[3][4]
Observed separation
Observation epoch 2008-09-18
Angular separation(ρ)964[5][note 2] mas
Position angle(θ)317.06[5][note 2]°
Projected separation(d)38[5] AU
Orbital elements
Semimajor axis(a)~ 38[5][note 3] AU
(~ 5600 Gm)
Orbital period(P)~ 190[5][note 3] y
Physical characteristics
Mass(m)10 ± 3[5] MJ
Radius(r)1.3[6] RJ
Temperature(T)1090+10−90[5] K
Discovery information
Discovery dateNovember 13, 2008
Discoverer(s)Marois et al.
Detection methodDirect imaging
Discovery siteKeck and Gemini
observatories
in Hawaii
Discovery statusPublished
Other designations
HD 218396 c[7]
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBADdata

HR 8799 c is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. This planet has a mass between 7 and 13 Jupiter masses and a radius from 20 to 30% larger than Jupiter's. It orbits at 38 AU from HR 8799 with an unknown eccentricity and a period of 190 years; it is the middle known planet in the HR 8799 system. Along with two other planets orbiting HR 8799, this planet was discovered on November 13, 2008 by Marois et al., using the Keck and the Gemini observatories in Hawaii. These planets were discovered using the direct imaging technique.[5][8][9][10][11] In January of 2010, HR 8799 c became the first exoplanet to have a portion of its spectrum directly observed, demonstrating the feasibly spectrographic studies of exoplanets.[12][6]

Notes

  1. ^ a b Computed from parallax: \scriptstyle \mathrm{distance\ in\ parsecs}=\frac{1000}{\mathrm{parallax\ in\ milliarcseconds}}
  2. ^ a b Calculated from the separations in the East and North directions which are −0.657 and 0.706 arcseconds respectively.
  3. ^ a b Value given assuming the planet's orbit is circular and is being observed face-on.

References

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See also

External links

Coordinates: 23h 07m 28.7150s, +21° 08′ 03.302″


es:HR 8799 c

fr:HR 8799 cko:HR 8799 cit:HR 8799 c


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