HD 96700

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HD 96700
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra
Right ascension 11h 07m 54.427s[1]
Declination −30° 10′ 28.45″[1]
Apparent magnitude (V) 6.51[2]
Characteristics
Spectral type G0 V[3]
B−V color index 0.606[2]
Distance
82.79 ± 0.04 ly
(25.38 ± 0.01 pc)
Details
Gyr
HR 4328, SAO 179558[7]
Database references
SIMBADdata

HD 96700 is the

light years away from the Sun.[1] It is drifting further away with a radial velocity of 12.8 km/s.[2]

This is considered a high

arc seconds per year, along a position angle of 255.21°.[9] It is a member of the thin disk population of stars and is orbiting the galactic core at a mean galactocentric distance of 23.4 kly (7.17 kpc) with an orbital eccentricity 0.16. The inclination of its galactic orbit carries it no more than 950 ly (290 pc) away from the galactic plane.[10]

HD 96700 is a

G-type main sequence star with a stellar classification of G0 V.[3] It has a slightly lower mass than the Sun[4] and a lower metallicity.[3] The estimated size is similar to the Sun, ranging from 96% to 110% depending on the method used.[5] The effective temperature of the star's outer atmosphere is 5,879 K,[3] giving it the yellow-hued glow of a G-type star.[11] It appears to be much older than the Sun, with age estimates ranging up to 11.9 billion years.[6]

A 2015 survey ruled out the existence of any additional stellar companions at projected distances from 7 to 209 astronomical units.[12]

Planetary system

Two planetary companions have been discovered by the

AU with a brief orbital period of 8.13 days. It has at least nine times the mass of the Earth, and so may be a Neptune-like planet. But until astronomers can determine the orbital inclination or directly image the planet, there is no way to know for certain its actual mass.[13]

The second companion, HD 96700 c, is orbiting at roughly the same distance as

semimajor axis of 0.42 AU and a period of around 103 days. It may have a relatively high eccentricity of 0.4. This object has at least 13 times the mass of the Earth.[13] A 2017 study found that HD 96700 b does not transit its host star.[14] The existence of both planets was confirmed in 2021, and an additional planetary companion orbiting between them was found.[15]

The HD 96700 planetary system[15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥8.9±0.4 M🜨 0.0777±0.0013 8.1245±0.0006 <0.138 — —
c ≥3.5±0.4 M🜨 0.141±0.002 19.88±0.01 <0.293 — —
d ≥12.7±1.0 M🜨 0.424±0.007 103.5±0.1 0.27±0.08 — —

References

  1. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  2. ^
    S2CID 56094559
    , A64.
  3. ^
    S2CID 119476992
    .
  4. ^
    S2CID 55237847
    , A150.
  5. ^
    S2CID 425754
    .
  6. ^
    S2CID 118577511
    .
  7. ^ "HD 96700". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-12-07.
  8. doi:10.1086/125956
    .
  9. S2CID 36667868
    .
  10. S2CID 17316450
    .
  11. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on March 18, 2012, retrieved 2012-01-16.
  12. hdl:1887/49340
    , retrieved 19 June 2020.
  13. ^
    Bibcode:2011arXiv1109.2497M
    .
  14. doi:10.1051/0004-6361/201629270
    , A117
  15. ^
    doi:10.1051/0004-6361/202141351
    , A104
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