Key parameters at a glance

A radius of 14.00 Earth radii
A mass of 233.92 Earth masses
Surface gravity around 1.19 g
An orbital period of 278.590 days
Semi-major axis 0.8380 AU
Distance from Earth 250.34 light-years
Earth Similarity Index 0.283
Travel time at Voyager 1 speed 4,414,798 years

ome Ser b Planet Profile

Physical Specs

Radius

14.00 R⊕

Radius (Jupiter)

1.250 R♃

Mass

233.92 M⊕

Mass (Jupiter)

0.736 M♃

Density

0.47 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.283

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕

Metric	Earth	ome Ser b	Jupiter
Radius (R⊕)	1.00	14.00	11.21
Mass (M⊕)	1.00	233.92	317.83
Density (g/cm³)	5.51	0.47	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	233.922 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 141680

HIP

HIP 77578

TIC

TIC 272677041

Gaia DR2

Gaia DR2 4423234230853333632

Gaia DR3

Gaia DR3 4423234230853333632

System

ome Ser

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771

Mass 233.922 M⊕ · percentile 25 / cohort 1747

Orbital period 278.59 d · percentile 60 / cohort 1533

Distance 76.76 pc · percentile 30 / cohort 1759

ESI 0.283 · percentile 53 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

278.590 days

Semi-major axis

0.8380 AU

Eccentricity

0.180

Inclination

— °

Year Length

A year here lasts approximately 278.59 Earth days (76.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.8380 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.283

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2013

Instrument

HIDES Echelle Spectrograph

Publication

2013-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at Okayama Astrophysical Observatory (2 shown).

HD 120084 b · Gas Giant HD 2952 b · Gas Giant

Host System: ome Ser

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,724 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

10.990 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

2.370 dex

Systemic radial velocity

-3.65 km/s

Rotational v·sin i

1.89 km/s

Metallicity ratio

[Fe/H]

Distance

76.76 parsec

Light-years 250.34 ly

V-band magnitude

5.22 mag

Voyager-speed travel 4,414,798 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

13.002 mas

Total Proper Motion

56.967 mas/yr

PM Right Ascension

30.60 mas/yr

PM Declination

-48.05 mas/yr

Galactic Cartesian (pc)

x = -0.536 · y = -0.843 · z = 0.038

Equatorial (J2000)

RA 237.57324° · Dec 2.19630°

Galactic ℓ, b

10.538° · 40.501°

Ecliptic λ, β

234.762° · 21.757°

HTM-20 index

453329942

Observation Record

Photometric series

RV measurements

Archive notes