Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 486.28 Earth masses
Surface gravity around 2.67 g
An orbital period of 3,117.000 days
Semi-major axis 4.4300 AU
Distance from Earth 74.10 light-years
Earth Similarity Index 0.345
Travel time at Voyager 1 speed 1,306,731 years

psi1 Dra B b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

486.28 M⊕

Mass (Jupiter)

1.530 M♃

Density

1.09 g/cm³

Surface Gravity

2.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.345

HZ Position Unknown

Controversial No

Discovery

Year 2015

Method Radial Velocity

Facility McDonald Observatory

Telescope 2.7m Harlan J. Smith Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	psi1 Dra B b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	486.28	317.83
Density (g/cm³)	5.51	1.09	1.33
Surface Gravity (g)	1.00	2.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	486.280 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 162004

HIP

HIP 86620

TIC

TIC 441804565

Gaia DR2

Gaia DR2 1651268763281885952

Gaia DR3

Gaia DR3 1651268763282397312

System

psi1 Dra

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 486.280 M⊕ · percentile 48 / cohort 1747

Orbital period 3,117.00 d · percentile 89 / cohort 1533

Distance 22.72 pc · percentile 5 / cohort 1759

ESI 0.345 · percentile 69 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3,117.000 days

Semi-major axis

4.4300 AU

Eccentricity

0.400

Inclination

— °

Year Length

A year here lasts about 8.53 Earth years on a highly eccentric trajectory at a mean orbital distance of 4.4300 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.345

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Endl et al. 2016

Instrument

Tull Coude Spectrograph

Publication

2016-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at McDonald Observatory (3 shown).

HD 95127 b · Gas Giant BD+49 828 b · Gas Giant HD 216536 b · Gas Giant

Host System: psi1 Dra B

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,212 K — hotter than the Sun (5,778 K)

Estimated Age

3.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.256 R☉

Stellar Mass

1.190 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.886 g/cm³

Systemic radial velocity

-11.00 km/s

Rotational v·sin i

6.00 km/s

Metallicity ratio

[Fe/H]

Distance

22.72 parsec

Light-years 74.10 ly

V-band magnitude

5.81 mag

Voyager-speed travel 1,306,731 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

43.988 mas

Total Proper Motion

277.917 mas/yr

PM Right Ascension

33.79 mas/yr

PM Declination

-275.86 mas/yr

Galactic Cartesian (pc)

x = -0.024 · y = -0.305 · z = 0.952

Equatorial (J2000)

RA 265.49258° · Dec 72.15571°

Galactic ℓ, b

102.976° · 31.028°

Ecliptic λ, β

103.753° · 84.188°

HTM-20 index

1914018771

Observation Record

Photometric series

Stellar spectra

Archive notes