Key parameters at a glance

A radius of 12.70 Earth radii
A mass of 2,040.00 Earth masses
Surface gravity around 12.65 g
An orbital period of 270.000 days
Semi-major axis 0.9400 AU
Distance from Earth 384.56 light-years
Earth Similarity Index 0.442
Travel time at Voyager 1 speed 6,781,786 years

HD 1666 b Planet Profile

Physical Specs

Radius

12.70 R⊕

Radius (Jupiter)

1.130 R♃

Mass

2,040.00 M⊕

Mass (Jupiter)

6.430 M♃

Density

5.47 g/cm³

Surface Gravity

12.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.442

HZ Position Unknown

Controversial No

Discovery

Year 2015

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1130of 1771

top 63.7%

This planet

12.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 168863 b 12.70 R⊕ HD 233604 b 12.70 R⊕ Kepler-424 c 12.70 R⊕

Metric	Earth	HD 1666 b	Jupiter
Radius (R⊕)	1.00	12.70	11.21
Mass (M⊕)	1.00	2,040.00	317.83
Density (g/cm³)	5.51	5.47	1.33
Surface Gravity (g)	1.00	12.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2,040.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 1666

HIP

HIP 1666

TIC

TIC 211439561

Gaia DR2

Gaia DR2 2362099457224379136

Gaia DR3

Gaia DR3 2362099457224379136

System

HD 1666

Percentile among Gas Giant cohort

Radius 12.700 R⊕ · percentile 34 / cohort 1771

Mass 2,040.000 M⊕ · percentile 80 / cohort 1747

Orbital period 270.00 d · percentile 59 / cohort 1533

Distance 117.91 pc · percentile 38 / cohort 1759

ESI 0.442 · percentile 98 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

270.000 days

Semi-major axis

0.9400 AU

Eccentricity

0.630

Inclination

— °

Year Length

A year here lasts approximately 270.00 Earth days (73.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.9400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.442

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Harakawa et al. 2015

Instrument

Multiple Instruments

Publication

2015-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at Multiple Observatories (8 shown).

HIP 67851 c · Gas Giant HD 67087 c · Gas Giant KELT-6 c · Gas Giant HD 1605 c · Gas Giant HD 67087 b · Gas Giant HIP 107773 b · Gas Giant HIP 67851 b · Gas Giant HD 1605 b · Gas Giant

Host System: HD 1666

Spectral Class

F-type yellow-white

Effective Temperature

6,317 K — hotter than the Sun (5,778 K)

Estimated Age

1.76 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.930 R☉

Stellar Mass

1.500 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.060 dex

Stellar density

0.182 g/cm³

Systemic radial velocity

17.95 km/s

Rotational v·sin i

5.60 km/s

Metallicity ratio

[Fe/H]

Distance

117.91 parsec

Light-years 384.56 ly

V-band magnitude

8.17 mag

Voyager-speed travel 6,781,786 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.453 mas

Total Proper Motion

60.168 mas/yr

PM Right Ascension

-8.50 mas/yr

PM Declination

-59.56 mas/yr

Galactic Cartesian (pc)

x = 0.936 · y = 0.085 · z = -0.341

Equatorial (J2000)

RA 5.21804° · Dec -19.93148°

Galactic ℓ, b

77.110° · -79.962°

Ecliptic λ, β

356.502° · -20.290°

HTM-20 index

-1448212915