Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,525.58 Earth masses
Surface gravity around 9.17 g
An orbital period of 654.500 days
Semi-major axis 1.5520 AU
Equilibrium temperature 261 K (-12 °C)
Distance from Earth 221.57 light-years
Earth Similarity Index 0.493
Travel time at Voyager 1 speed 3,907,332 years

HD 27969 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,525.58 M⊕

Mass (Jupiter)

4.800 M♃

Density

3.91 g/cm³

Surface Gravity

9.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.493

HZ Position Habitable

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 27969 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,525.58	317.83
Density (g/cm³)	5.51	3.91	1.33
Surface Gravity (g)	1.00	9.17	2.53
Insolation (S⊕)	1.00	0.76	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,525.576 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 27969

HIP

HIP 20753

TIC

TIC 27828749

Gaia DR2

Gaia DR2 228532602782156288

Gaia DR3

Gaia DR3 228532602782156288

System

HD 27969

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,525.576 M⊕ · percentile 74 / cohort 1747

Orbital period 654.50 d · percentile 71 / cohort 1533

Distance 67.93 pc · percentile 28 / cohort 1759

ESI 0.493 · percentile 100 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

654.500 days

Semi-major axis

1.5520 AU

Eccentricity

0.182

Inclination

— °

Year Length

A year here lasts about 1.79 Earth years on a mildly elliptical path at a mean orbital distance of 1.5520 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

263.000

RV semi-amplitude (K)

103.600 m/s

Long. of periastron (ω)

106.60°

Angular separation (arcsec)

22.80000

Eq. Temperature

261K

(-12 °C)

Insolation (S⊕)

0.76

Earth = 1.00

Earth Similarity (ESI)

0.493

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen.

Discovery Paper

Primary reference

Demangeon et al. 2021

Instrument

SOPHIE Spectrograph

Publication

2021-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Haute-Provence Observatory (11 shown).

HD 109286 b · Gas Giant HD 211403 b · Gas Giant HD 80869 b · Gas Giant BD+63 1405 b · Gas Giant HD 331093 b · Gas Giant BD+45 564 b · Gas Giant HD 95544 b · Gas Giant HD 115954 b · Gas Giant HD 124330 b · Gas Giant HD 155193 b · Gas Giant BD+55 362 b · Gas Giant

Host System: HD 27969

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,966 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.270 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.120 dex

Stellar density

0.265 g/cm³

Rotational v·sin i

4.10 km/s

Metallicity ratio

[Fe/H]

Distance

67.93 parsec

Light-years 221.57 ly

V-band magnitude

7.66 mag

Voyager-speed travel 3,907,332 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

14.692 mas

Total Proper Motion

222.640 mas/yr

PM Right Ascension

134.15 mas/yr

PM Declination

-177.68 mas/yr

Galactic Cartesian (pc)

x = 0.290 · y = 0.673 · z = 0.681

Equatorial (J2000)

RA 66.70684° · Dec 42.90872°

Galactic ℓ, b

159.305° · -4.250°

Ecliptic λ, β

71.933° · 20.919°

HTM-20 index

-150092827