Key parameters at a glance

A radius of 14.10 Earth radii
A mass of 181.16 Earth masses
Surface gravity around 0.91 g
An orbital period of 279.300 days
Semi-major axis 0.8500 AU
Distance from Earth 349.60 light-years
Earth Similarity Index 0.264
Travel time at Voyager 1 speed 6,165,197 years

HD 161178 b Planet Profile

Physical Specs

Radius

14.10 R⊕

Radius (Jupiter)

1.260 R♃

Mass

181.16 M⊕

Mass (Jupiter)

0.570 M♃

Density

0.36 g/cm³

Surface Gravity

0.91 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.264

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#371of 1771

top 20.9%

This planet

14.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 27894 b 14.10 R⊕ HD 103720 b 14.10 R⊕ HD 216770 b 14.10 R⊕

Metric	Earth	HD 161178 b	Jupiter
Radius (R⊕)	1.00	14.10	11.21
Mass (M⊕)	1.00	181.16	317.83
Density (g/cm³)	5.51	0.36	1.33
Surface Gravity (g)	1.00	0.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	181.162 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 161178

TIC

TIC 441797545

Gaia DR2

Gaia DR2 1651497186822868224

Gaia DR3

Gaia DR3 1651497186822868224

System

HD 161178

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 181.162 M⊕ · percentile 16 / cohort 1747

Orbital period 279.30 d · percentile 60 / cohort 1533

Distance 107.19 pc · percentile 36 / cohort 1759

ESI 0.264 · percentile 48 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

279.300 days

Semi-major axis

0.8500 AU

Eccentricity

0.044

Inclination

— °

Year Length

A year here lasts approximately 279.30 Earth days (76.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.8500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.264

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Teng et al. 2021

Instrument

HIDES Echelle Spectrograph

Publication

2021-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Okayama Astrophysical Observatory (7 shown).

gam Psc b · Gas Giant HD 99283 b · Gas Giant HD 219139 b · Gas Giant HD 360 b · Gas Giant HD 79181 b · Gas Giant ups Leo b · Gas Giant HD 10975 b · Gas Giant

Host System: HD 161178

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,786 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

10.950 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

-0.21

Extended Stellar Properties

Surface gravity (log g)

2.380 dex

Rotational v·sin i

1.78 km/s

Metallicity ratio

[Fe/H]

Distance

107.19 parsec

Light-years 349.60 ly

V-band magnitude

5.88 mag

Voyager-speed travel 6,165,197 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.301 mas

Total Proper Motion

28.170 mas/yr

PM Right Ascension

23.80 mas/yr

PM Declination

15.07 mas/yr

Galactic Cartesian (pc)

x = -0.030 · y = -0.300 · z = 0.953

Equatorial (J2000)

RA 264.28736° · Dec 72.45586°

Galactic ℓ, b

103.385° · 31.347°

Ecliptic λ, β

106.078° · 83.782°

HTM-20 index

1551084891