Key parameters at a glance

A radius of 13.80 Earth radii
A mass of 317.83 Earth masses
Surface gravity around 1.67 g
An orbital period of 341.200 days
Semi-major axis 1.0320 AU
Distance from Earth 278.64 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 4,913,850 years

1 sibling around HD 75784

HD 75784 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 75784 b this	Gas Giant	13.80	317.83	341.200	—	2014
HD 75784 c	Gas Giant	12.80	1,792.56	7,900.000	—	2018

HD 75784 b Planet Profile

Physical Specs

Radius

13.80 R⊕

Radius (Jupiter)

1.230 R♃

Mass

317.83 M⊕

Mass (Jupiter)

1.000 M♃

Density

0.67 g/cm³

Surface Gravity

1.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.308

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#510of 1771

top 28.7%

This planet

13.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 179 b 13.80 R⊕ GJ 832 b 13.80 R⊕ HD 219415 b 13.80 R⊕

Metric	Earth	HD 75784 b	Jupiter
Radius (R⊕)	1.00	13.80	11.21
Mass (M⊕)	1.00	317.83	317.83
Density (g/cm³)	5.51	0.67	1.33
Surface Gravity (g)	1.00	1.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	317.830 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 75784

HIP

HIP 43569

TIC

TIC 46310554

Gaia DR2

Gaia DR2 608182831000585728

Gaia DR3

Gaia DR3 608182831000585728

System

HD 75784

Percentile among Gas Giant cohort

Radius 13.800 R⊕ · percentile 70 / cohort 1771

Mass 317.830 M⊕ · percentile 35 / cohort 1747

Orbital period 341.20 d · percentile 62 / cohort 1533

Distance 85.43 pc · percentile 32 / cohort 1759

ESI 0.308 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

341.200 days

Semi-major axis

1.0320 AU

Eccentricity

0.097

Inclination

— °

Year Length

A year here lasts approximately 341.20 Earth days (93.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 1.0320 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.308

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Giguere et al. 2015

Instrument

HIRES Spectrometer

Publication

2015-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at W. M. Keck Observatory (11 shown).

HAT-P-44 c · Gas Giant Kepler-94 c · Gas Giant HD 4203 c · Gas Giant Kepler-48 e · Gas Giant Kepler-407 c · Gas Giant HD 10442 b · Gas Giant HD 5319 c · Gas Giant GJ 849 c · Gas Giant Kepler-25 d · Gas Giant Kepler-93 c · Unclassified Kepler-97 c · Unclassified

Host System: HD 75784

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,867 K — cooler than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

3.400 R☉

Stellar Mass

1.260 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

3.460 dex

Systemic radial velocity

45.64 km/s

Metallicity ratio

[Fe/H]

Distance

85.43 parsec

Light-years 278.64 ly

V-band magnitude

7.84 mag

Voyager-speed travel 4,913,850 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

11.677 mas

Total Proper Motion

148.680 mas/yr

PM Right Ascension

-119.40 mas/yr

PM Declination

-88.59 mas/yr

Galactic Cartesian (pc)

x = -0.665 · y = 0.711 · z = 0.229

Equatorial (J2000)

RA 133.09923° · Dec 13.23305°

Galactic ℓ, b

214.282° · 32.731°

Ecliptic λ, β

131.823° · -4.170°

HTM-20 index

2094508888