# HD 96700

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Star in the constellation Hydra

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] Astrometry Radial velocity (Rv) 12.839±0.0105[2] km/s Proper motion (μ) RA: −505.371 mas/yr[1] Dec.: −132.293 mas/yr[1] Parallax (π) 39.3975±0.0208 mas[1] Distance 82.79 ± 0.04 ly (25.38 ± 0.01 pc) Details Mass 1.00±0.01[4] M☉ Radius 1.142+0.015 −0.016[5] R☉ Luminosity 1.45[6] L☉ Surface gravity (log g) 4.33±0.02[4] cgs Temperature 5,878±6[4] K Metallicity [Fe/H] −0.189±0.004[4] dex Age 6.80+0.64 −0.24[4] Gyr Other designations CD−29°8875, GJ 412.2, HD 96700, HIP 54400, HR 4328, SAO 179558[7] Database references SIMBAD data Exoplanet Archive data ARICNS data

**HD 96700** is a star in the equatorial [constellation](/source/Constellation) of [Hydra](/source/Hydra_(constellation)). It has an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 6.51,[2] which puts it below the limit that can be seen with the naked eye by a typical observer.[8] (According to the [Bortle scale](/source/Bortle_scale), it is possible for some observers to see it from dark rural skies.) Based upon [parallax](/source/Stellar_parallax) measurements, this star is around 83 [light years](/source/Light_year) away from the [Sun](/source/Sun).[1] It is drifting further away with a [radial velocity](/source/Radial_velocity) of 12.8 km/s.[2]

This is considered a high [proper motion](/source/Proper_motion) star, shifting its position across the [celestial sphere](/source/Celestial_sphere) at a rate of 0.52 [arc seconds](/source/Arc_second) per year, along a [position angle](/source/Position_angle) of 255.21°.[9] It is a member of the [thin disk](/source/Thin_disk) population of stars and is orbiting the [galactic core](/source/Galactic_Center) at a mean galactocentric distance of 23.4 [kly](/source/Light-year#Definitions) (7.17 [kpc](/source/Parsec#Parsecs_and_kiloparsecs)) with an [orbital eccentricity](/source/Orbital_eccentricity) 0.16. The inclination of its galactic orbit carries it no more than 950 ly (290 pc) away from the [galactic plane](/source/Galactic_plane).[10]

HD 96700 is a [G-type main sequence star](/source/G-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of G0 V.[3] It has the same mass than the Sun and a lower [metallicity](/source/Metallicity).[4] The estimated size is 114% that of the Sun.[5] The [effective temperature](/source/Effective_temperature) of the star's [outer atmosphere](/source/Stellar_atmosphere) is 5,878 K,[4] giving it the yellow-hued glow of a G-type star.[11] It has an estimated age of 6.8 billion years.[4]

Together with the [proper motion companion](/source/Proper_motion_companion) CD-27 7781, HD 96700 make a wide [binary system](/source/Binary_system). At an angular distance of 6,867", the [projected separation](/source/Projected_separation) between both stars is of 174,000 AU (2.75 [light-years](/source/Light-year)). The companion is a [K-type main-sequence star](/source/K-type_main-sequence_star) of K6V [spectral type](/source/Spectral_type).[12] The existence of any additional stellar companions at projected distances from 7 to 209 [astronomical units](/source/Astronomical_unit) is ruled out.[13]

## Planetary system

Two planetary companions have been discovered by the [HARPS](/source/High_Accuracy_Radial_Velocity_Planet_Searcher) instrument, which measures variations in the star's [radial velocity](/source/Radial_velocity) that are presumed to be caused by [gravitational perturbations](/source/Gravitational_perturbation) from orbiting objects. The innermost planet, HD 96700 b, is orbiting close to the star at a distance of roughly 0.08 [AU](/source/Astronomical_Unit) with a brief [orbital period](/source/Orbital_period) of 8.13 days. It has at least nine times the mass of the Earth, and so may be a [Neptune](/source/Neptune)-like planet. But until astronomers can determine the [orbital inclination](/source/Orbital_inclination) or directly image the planet, there is no way to know for certain its actual mass.[14]

The second companion, HD 96700 d, is orbiting at roughly the same distance as [Mercury](/source/Mercury_(planet)) from the Sun, with a [semimajor axis](/source/Semimajor_axis) of 0.42 AU and a period of around 103 days. It may have a relatively high [eccentricity](/source/Orbital_eccentricity) of 0.4. This object has at least 13 times the mass of the Earth.[14] A 2017 study found that HD 96700 b does not [transit](/source/Astronomical_transit) its host star.[15] The existence of both planets was confirmed in 2021, and an additional planetary companion orbiting between them was found,[16] but in 2026 it was found that the radial velocity signal attributed to this planet is likely correlated with [stellar activity](/source/Stellar_activity) indicators, making its existence uncertain.[17]

The HD 96700 planetary system[16] 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 (disputed[17]) ≥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

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1. **[^](#cite_ref-SIMBAD_7-0)** ["HD 96700"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+96700). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2015-12-07.

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v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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Adapted from the Wikipedia article [HD 96700](https://en.wikipedia.org/wiki/HD_96700) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_96700?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.