HD 213240

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HD 213240
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Grus
Right ascension 22h 31m 00.3672s
Declination −49º 25' 59.7731″
Apparent magnitude (V) 6.80
Absolute magnitude (V) 3.75
Distance 132.91 ly
(40.75 pc)
Spectral type G0/G1V
Other designations
CD−50 13701, HIP 111143, SAO 231175

HD 213240 is a yellow star located in the constellation Grus. The magnitudes were m=6.80 and M=3.75. The distance is 132.91 light years or 40.75 parsecs or 1.2574 exameters away from the Earth. It is a main-sequence star with significant amounts of hydrogen in its core. It is a metal-rich star and more evolved than our local star. This star is also called HIP 111143.

[edit] HD 213240 b

HD 213240 b
Discovery
Discovered by Santos et al.
Discovery site Switzerland
Discovery date 2001
Detection method Doppler Spectroscopy
Designations
Alternative names HIP 111143 b
SAO 231175 b
Semi-major axis 1.92 AU
Eccentricity 0.421±0.015
Orbital period 882.7±7.6 d
Average orbital speed 23.7 km/s
Angular distance 47.12 mas
Longitude of periastron 201.0±3.2°
Time of periastron 2451499±12 JD
Semi-amplitude 96.6±2.0 m/s
Physical characteristics
Mass >4.72 MJ

HD 213240 b is an extrasolar planet with a mass type of Ic and the appearance type of W (Water giant). It has an orbital period of 882.7 days or 76.27 megaseconds. The orbital distance is 1.92 astronomical units or 287 gigameters or 9.31 microparsecs. The orbital eccentricity is 42.1%. The closest distance and farthest distance are 1.11 AU and 2.73 AU respectively; the difference and quotient between q and Q are 1.62 AU and 2.46 times respectively. The angular separation between a planet and a star as seen from Earth is 47.12 milliarcsecond (mas).

The origin of this known planet came from the country of Switzerland and the astronomer Santos. The time was in 2001 and the method was Doppler spectroscopy.

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