Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,698.36 Earth masses
Surface gravity around 17.00 g
An orbital period of 6,717.000 days
Semi-major axis 7.3900 AU
Distance from Earth 254.57 light-years
Earth Similarity Index 0.406
Travel time at Voyager 1 speed 4,489,278 years

1 sibling around HD 75898

HD 75898 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 75898 b	Gas Giant	13.20	810.46	422.820	—	2007
HD 75898 c this	Gas Giant	12.60	2,698.36	6,717.000	—	2024

HD 75898 c Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.120 R♃

Mass

2,698.36 M⊕

Mass (Jupiter)

8.490 M♃

Density

7.41 g/cm³

Surface Gravity

17.00 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.406

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1179of 1771

top 66.5%

This planet

12.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-419 c 12.60 R⊕ 2MASS J04414489+2301513 b 12.60 R⊕ HD 47536 b 12.60 R⊕

Metric	Earth	HD 75898 c	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,698.36	317.83
Density (g/cm³)	5.51	7.41	1.33
Surface Gravity (g)	1.00	17.00	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,698.363 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 75898

HIP

HIP 43674

TIC

TIC 302580456

Gaia DR2

Gaia DR2 713135102814342656

Gaia DR3

Gaia DR3 713135102814770432

System

HD 75898

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,698.363 M⊕ · percentile 85 / cohort 1747

Orbital period 6,717.00 d · percentile 94 / cohort 1533

Distance 78.05 pc · percentile 30 / cohort 1759

ESI 0.406 · percentile 87 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

6,717.000 days

Semi-major axis

7.3900 AU

Eccentricity

0.080

Inclination

153.00 °

Year Length

A year here lasts about 18.39 Earth years on a nearly circular orbit at a mean orbital distance of 7.3900 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.406

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Ruggieri et al. 2024

Instrument

Multiple Instruments

Publication

2024-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2024 at Multiple Observatories (12 shown).

HD 134606 e · Super-Earth Kepler-51 e · Sub-Neptune HD 134606 f · Sub-Neptune HD 134606 b · Sub-Neptune Teegarden's Star d · Rocky Terrestrial HD 134606 c · Sub-Neptune HD 104067 c · Sub-Neptune GJ 1289 b · Sub-Neptune TOI-4562 c · Gas Giant HD 222237 b · Gas Giant CI Tau c · Gas Giant GJ 900 b · Gas Giant

Host System: HD 75898

Spectral Class

F-type yellow-white

Effective Temperature

6,122 K — hotter than the Sun (5,778 K)

Estimated Age

3.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.550 R☉

Stellar Mass

1.295 M☉

Metallicity [Fe/H]

0.29

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

0.339 g/cm³

Systemic radial velocity

21.79 km/s

Rotational v·sin i

4.20 km/s

Activity index (log R'HK)

-5.010

Metallicity ratio

[Fe/H]

Distance

78.05 parsec

Light-years 254.57 ly

V-band magnitude

8.03 mag

Voyager-speed travel 4,489,278 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.784 mas

Total Proper Motion

99.353 mas/yr

PM Right Ascension

-95.13 mas/yr

PM Declination

-28.67 mas/yr

Galactic Cartesian (pc)

x = -0.577 · y = 0.608 · z = 0.545

Equatorial (J2000)

RA 133.46120° · Dec 33.05669°

Galactic ℓ, b

190.970° · 38.936°

Ecliptic λ, β

126.637° · 14.979°

HTM-20 index

-1721451109

Observation Record

Photometric series

RV measurements

Stellar spectra