HD 102956 b

HD 102956
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	11h 51m 22.5111s
Declination	+57° 38′ 26.6427″
Characteristics
Evolutionary stage	Main sequence
Spectral type	A
Astrometry
Radial velocity (Rv)	−25±83 km/s
Proper motion (μ)	RA: −11.24±0.049 mas/yr ; Dec.: −17.578±0.049 mas/yr
Parallax (π)	8.1753 ± 0.0290 mas
Distance	399 ± 1 ly ; (122.3 ± 0.4 pc)
Absolute magnitude (MV)	2.5
Details
Mass	1.68±0.11 M☉
Radius	4.4±0.1 R☉
Luminosity (visual, LV)	11.6±0.5 L☉
Temperature	5054±44 K
Metallicity [Fe/H]	+0.19±0.04 dex
Rotational velocity (v sin i)	0.30 km/s
Other designations
	BD+58 1340, HIP 57820, SAO 28161, TYC 3839-00846-1, 2MASS J11512253+5738267
Database references
SIMBAD	data
Exoplanet Archive	data

HD 102956 b / Isagel
	Artist's impression HD 102956 b
Discovery
Discovered by	Johnson et al.
Discovery site	Keck Observatory
Discovery date	2010
Detection method	Doppler spectroscopy
Orbital characteristics
Semi-major axis	0.0807±0.0073 AU
Eccentricity	0.037±0.019
Orbital period (sidereal)	6.49470±0.00019 d
Time of perihelion	2455351.45±0.64 JD
Argument of perihelion	301±33 º
Semi-amplitude	74.6±1.8 m/s
Star	HD 102956
Physical characteristics
Mass	≥0.960±0.023 MJ

HD 102956 b or Isagel is an extrasolar planet discovered in 2010 by a team of American astronomers led by John Johnson using Doppler spectroscopy and the Keck Observatory in Hawaii. HD 102956 b is in the orbit of host star HD 102956. The planet is at most the mass of Jupiter, orbiting every 6.5 days at a distance of 12 million km. HD 202956 b has a very circular orbit.^[1] The system is roughly 399 light years from us.

^ ^a ^b Cite error: The named reference Johnson2010 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Luhn2019 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
^ Cite error: The named reference Simbad was invoked but never defined (see the help page).

[Johnson2010-1] Cite error: The named reference Johnson2010 was invoked but never defined (see the help page).

[Luhn2019-2] Cite error: The named reference Luhn2019 was invoked but never defined (see the help page).

[Gaia_DR2-3] Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).

[Simbad-4] Cite error: The named reference Simbad was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	11^h 51^m 22.5111^s^[3]
Declination	+57° 38′ 26.6427″^[3]
Characteristics
Evolutionary stage	Main sequence
Spectral type	A
Astrometry

Radial velocity (R_v)	−25±83 km/s
Proper motion (μ)	RA: −11.24±0.049^[3] mas/yr Dec.: −17.578±0.049^[3] mas/yr
Parallax (π)	8.1753 ± 0.0290 mas^[3]
Distance	399 ± 1 ly (122.3 ± 0.4 pc)
Absolute magnitude (M_V)	2.5

Details

Mass	1.68±0.11 `M`_☉
Radius	4.4±0.1 `R`_☉
Luminosity (visual, L_V)	11.6±0.5 `L`_☉
Temperature	5054±44 K
Metallicity [Fe/H]	+0.19±0.04 dex
Rotational velocity (v sin i)	0.30 km/s

Other designations
BD+58 1340, HIP 57820, SAO 28161, TYC 3839-00846-1, 2MASS J11512253+5738267^[4]
Database references
SIMBAD	data
Exoplanet Archive	data

Discovery^[1]
Artist's impression HD 102956 b
Discovered by	Johnson et al.
Discovery site	Keck Observatory
Discovery date	2010
Detection method	Doppler spectroscopy
Orbital characteristics^[2]
Semi-major axis	0.0807±0.0073 AU
Eccentricity	0.037±0.019
Orbital period (sidereal)	6.49470±0.00019 d
Time of perihelion	2455351.45±0.64 JD
Argument of perihelion	301±33 º
Semi-amplitude	74.6±1.8 m/s
Star	HD 102956
Physical characteristics^[2]
Mass	≥0.960±0.023 M_J