Key parameters at a glance

A radius of 2.13 Earth radii
A mass of 5.20 Earth masses
Surface gravity around 1.15 g
An orbital period of 51.760 days
Semi-major axis 0.2470 AU
Equilibrium temperature 398 K (125 °C)
Distance from Earth 42.19 light-years
Earth Similarity Index 0.640
Travel time at Voyager 1 speed 744,065 years

Context from the literature

HD 40307 f is an extrasolar planet orbiting the star HD 40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered by the radial velocity method, using the European Southern Observatory's HARPS apparatus by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of the University of Göttingen, Germany. The existence of planet was confirmed in 2015.

Excerpted from Wikipedia · full article

3 siblings around HD 40307

HD 40307 f shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 40307 b	Unclassified	—	1,189.00	4.312	910	2009
HD 40307 c	Unclassified	—	1,868.51	9.618	696	2009
HD 40307 d	Unclassified	—	1,775.39	20.432	541	2009
HD 40307 f this	Sub-Neptune	2.13	5.20	51.760	398	2013

HD 40307 f Planet Profile

Physical Specs

Radius

2.13 R⊕

Radius (Jupiter)

0.190 R♃

Mass

5.20 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.96 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.640

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#1765of 1978

top 89.2%

This planet

2.13R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-200 b 2.13 R⊕ Kepler-214 c 2.13 R⊕ GJ 514 b 2.13 R⊕

Metric	Earth	HD 40307 f	Jupiter
Radius (R⊕)	1.00	2.13	11.21
Mass (M⊕)	1.00	5.20	317.83
Density (g/cm³)	5.51	2.96	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	5.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 40307

HIP

HIP 27887

TIC

TIC 374859347

Gaia DR2

Gaia DR2 4758877919212831104

Gaia DR3

Gaia DR3 4758877919212831104

System

HD 40307

Percentile among Sub-Neptune cohort

Radius 2.130 R⊕ · percentile 10 / cohort 1978

Mass 5.200 M⊕ · percentile 12 / cohort 1978

Orbital period 51.76 d · percentile 86 / cohort 1946

Distance 12.94 pc · percentile 2 / cohort 1975

ESI 0.640 · percentile 87 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

51.760 days

Semi-major axis

0.2470 AU

Eccentricity

0.020

Inclination

— °

Year Length

A year here lasts approximately 51.76 Earth days (14.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2470 AU.

Eq. Temperature

398K

(125 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.640

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Tuomi et al. 2013

Instrument

HARPS Spectrograph

Publication

2013-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at La Silla Observatory (10 shown).

GJ 667 C c · Super-Earth GJ 163 c · Sub-Neptune GJ 163 b · Sub-Neptune HD 109271 b · Neptune-like HD 109271 c · Neptune-like POTS-1 b · Gas Giant GJ 163 d · Neptune-like HD 65216 c · Gas Giant BD-06 1339 c · Neptune-like HD 103774 b · Gas Giant

Host System: HD 40307

Spectral Class

K-type orange

Effective Temperature

4,956 K — cooler than the Sun (5,778 K)

Estimated Age

4.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.717 R☉

Stellar Mass

0.770 M☉

Metallicity [Fe/H]

-0.31

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

3.026 g/cm³

Systemic radial velocity

31.33 km/s

Rotational v·sin i

1.00 km/s

Metallicity ratio

[Fe/H]

Distance

12.94 parsec

Light-years 42.19 ly

V-band magnitude

7.17 mag

Voyager-speed travel 744,065 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

77.273 mas

Total Proper Motion

79.790 mas/yr

PM Right Ascension

-52.42 mas/yr

PM Declination

-60.15 mas/yr

Galactic Cartesian (pc)

x = 0.013 · y = 0.499 · z = -0.866

Equatorial (J2000)

RA 88.51722° · Dec -60.02373°

Galactic ℓ, b

268.815° · -30.341°

Ecliptic λ, β

83.508° · -83.430°

HTM-20 index

-1668356410

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

Wikipedia →

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Kepler-1161 b

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Kepler-283 b

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Kepler-942 b

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Kepler-161 b

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HD 39194 d

Sub-Neptune · K-type orange

Radius 2.12 R⊕ · 86.1 ly

Explore Related Categories

Sub-Neptune Planets Radial Velocity Discoveries La Silla Observatory Mission K-type orange Hosts