Key parameters at a glance

A radius of 11.10 Earth radii
A mass of 85.81 Earth masses
Surface gravity around 0.70 g
An orbital period of 5.240 days
Semi-major axis 0.0615 AU
Distance from Earth 205.75 light-years
Earth Similarity Index 0.286
Travel time at Voyager 1 speed 3,628,331 years

HD 109749 b Planet Profile

Physical Specs

Radius

11.10 R⊕

Radius (Jupiter)

0.993 R♃

Mass

85.81 M⊕

Mass (Jupiter)

0.270 M♃

Density

0.35 g/cm³

Surface Gravity

0.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.286

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1649of 1771

top 93.1%

This planet

11.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

MOA-2010-BLG-353L b 11.10 R⊕ TOI-1288 c 11.10 R⊕ HD 168746 b 11.10 R⊕

Metric	Earth	HD 109749 b	Jupiter
Radius (R⊕)	1.00	11.10	11.21
Mass (M⊕)	1.00	85.81	317.83
Density (g/cm³)	5.51	0.35	1.33
Surface Gravity (g)	1.00	0.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	85.814 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 109749

HIP

HIP 61595 A

TIC

TIC 144289338

Gaia DR2

Gaia DR2 6147000074988843264

Gaia DR3

Gaia DR3 6147000074988843264

System

HD 109749

Percentile among Gas Giant cohort

Radius 11.100 R⊕ · percentile 7 / cohort 1771

Mass 85.814 M⊕ · percentile 4 / cohort 1747

Orbital period 5.24 d · percentile 38 / cohort 1533

Distance 63.08 pc · percentile 26 / cohort 1759

ESI 0.286 · percentile 54 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5.240 days

Semi-major axis

0.0615 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 5.24 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0615 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.286

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Fischer et al. 2006

Instrument

HIRES Spectrometer

Publication

2006-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2005 at W. M. Keck Observatory (12 shown).

GJ 876 d · Sub-Neptune HD 190360 c · Neptune-like HIP 14810 b · Gas Giant HD 128311 c · Gas Giant HD 66428 b · Gas Giant HD 50499 b · Gas Giant HD 107148 b · Neptune-like HD 108874 c · Gas Giant HD 37124 d · Gas Giant HD 11964 b · Gas Giant HD 99109 b · Gas Giant HD 164922 b · Gas Giant

Host System: HD 109749

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,824 K — hotter than the Sun (5,778 K)

Estimated Age

3.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.220 R☉

Stellar Mass

1.130 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.310 dex

Stellar density

0.673 g/cm³

Systemic radial velocity

-13.20 km/s

Rotational v·sin i

2.00 km/s

Metallicity ratio

[Fe/H]

Distance

63.08 parsec

Light-years 205.75 ly

V-band magnitude

8.08 mag

Voyager-speed travel 3,628,331 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.824 mas

Total Proper Motion

157.507 mas/yr

PM Right Ascension

-157.37 mas/yr

PM Declination

-6.48 mas/yr

Galactic Cartesian (pc)

x = -0.747 · y = -0.123 · z = -0.654

Equatorial (J2000)

RA 189.31735° · Dec -40.81215°

Galactic ℓ, b

300.042° · 21.980°

Ecliptic λ, β

206.498° · -33.429°

HTM-20 index

1178537027

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes