HD 12661

Coordinates: Sky map 02h 04m 34.36s, +25° 24′ 53″
Source: Wikipedia, the free encyclopedia.
HD
12661

Planetary orbits of the HD 12661 system
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 04m 34.2884s[1]
Declination +25° 24′ 51.5142″[1]
Apparent magnitude (V) 7.42[2]
Characteristics
Spectral type G6 V[3]
U−B color index +0.33[2]
B−V color index +0.71[2]
Distance
123.6 ± 0.2 ly
(37.89 ± 0.06 pc)
Absolute magnitude (MV)4.58[3]
Details
Gyr
HIP 9683, SAO 75125.[6]
Database references
SIMBADdata

HD 12661 is a

extrasolar planets
.

Properties

The

thermonuclear fusion of hydrogen at its core. The effective temperature of the star's outer envelope is about 5,754 K,[3] giving it the characteristic yellow hue of a G-type star.[8] Based on stellar models, estimates of the radius of this star range from 107% to 112% times Sun's radius, while the mass is likely in the range from 107% to 110% of the Sun's mass.[3][4]

As a star ages it slows its

thermonuclear fusion at the core. However, this is less accurate technique. For HD 12661, the lithium abundance gives an age estimate of 4.4 billion years.[9]

The abundance of elements other than hydrogen and helium, what astronomers term the

statistically correlated with the presence of a multi-planet system around a star.[3] It is possible that a planet in this system may have been scattered and ended up being accreted by the star, which may account for the large surface metallicity.[10]

Planetary system

The first planet was discovered in 2001 from the Lick and Keck observatories using precision measurements of the star's radial velocity variations. The periodicity in this variation allowed astronomers to extract information about the planet's orbit and minimum mass.[3] A second planet was discovered by the same team two years later.[11] Both planets are greater in mass than Jupiter.[12]

The system is dynamically unstable.[13][14] "Either this system is being observed during a relatively rare state, or additional planets are affecting the observed radial velocities and/or the system’s secular eccentricity evolution."[10]

The HD 12661 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >2.30 ± 0.19 MJ 0.831 ± 0.048 262.709 ± 0.083 0.3768 ± 0.0077 — —
c >1.92 ± 0.16 MJ 2.90 ± 0.17 1708 ± 14 0.031 ± 0.022 — —

See also

  • List of extrasolar planets

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:1971lpms.book.....G
  3. ^
    doi:10.1086/320224
  4. ^
    doi:10.1086/428383
  5. S2CID 118553051
  6. Centre de Données astronomiques de Strasbourg
  7. ISBN 0-486-42820-6
  8. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on March 18, 2012, retrieved 2012-01-16
  9. ^
    S2CID 11616693
  10. ^
    S2CID 17386482
    .
  11. doi:10.1086/367889
    .
  12. ^
    S2CID 18169921
    .
  13. doi:10.1051/0004-6361:20021713
    .
  14. S2CID 31278031
    .

External links


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