Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,792.56 Earth masses
Surface gravity around 10.94 g
An orbital period of 7,900.000 days
Semi-major axis 8.4000 AU
Distance from Earth 278.64 light-years
Earth Similarity Index 0.436
Travel time at Voyager 1 speed 4,913,850 years

1 sibling around HD 75784

HD 75784 c 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	Gas Giant	13.80	317.83	341.200	—	2014
HD 75784 c this	Gas Giant	12.80	1,792.56	7,900.000	—	2018

HD 75784 c Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,792.56 M⊕

Mass (Jupiter)

5.640 M♃

Density

4.70 g/cm³

Surface Gravity

10.94 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.436

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 75784 c	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,792.56	317.83
Density (g/cm³)	5.51	4.70	1.33
Surface Gravity (g)	1.00	10.94	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,792.561 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 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,792.561 M⊕ · percentile 78 / cohort 1747

Orbital period 7,900.00 d · percentile 95 / cohort 1533

Distance 85.43 pc · percentile 32 / cohort 1759

ESI 0.436 · percentile 96 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

7,900.000 days

Semi-major axis

8.4000 AU

Eccentricity

0.489

Inclination

— °

Year Length

A year here lasts about 21.63 Earth years on a highly eccentric trajectory at a mean orbital distance of 8.4000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.436

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Ment et al. 2018

Instrument

HIRES Spectrometer

Publication

2018-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).

HD 99706 c · Gas Giant HD 148164 c · Gas Giant HD 55696 b · Gas Giant HD 95089 c · Gas Giant HD 13167 b · Gas Giant HD 18015 b · Gas Giant HAT-P-11 c · Gas Giant HD 156279 c · Gas Giant HD 98736 b · Gas Giant HD 180053 b · Gas Giant HD 114783 c · Gas Giant HD 72490 b · Gas Giant

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