Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 565.74 Earth masses
Surface gravity around 3.10 g
An orbital period of 798.500 days
Semi-major axis 1.6600 AU
Distance from Earth 68.95 light-years
Earth Similarity Index 0.355
Travel time at Voyager 1 speed 1,215,905 years

16 Cyg B b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.200 R♃

Mass

565.74 M⊕

Mass (Jupiter)

1.780 M♃

Density

1.26 g/cm³

Surface Gravity

3.10 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.355

HZ Position Unknown

Controversial No

Discovery

Year 1996

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

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	16 Cyg B b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	565.74	317.83
Density (g/cm³)	5.51	1.26	1.33
Surface Gravity (g)	1.00	3.10	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	565.737 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 186427

HIP

HIP 96901

TIC

TIC 27533327

Gaia DR2

Gaia DR2 2135550755683407232

Gaia DR3

Gaia DR3 2135550755683407232

System

16 Cyg

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 565.737 M⊕ · percentile 52 / cohort 1747

Orbital period 798.50 d · percentile 73 / cohort 1533

Distance 21.14 pc · percentile 5 / cohort 1759

ESI 0.355 · percentile 72 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

798.500 days

Semi-major axis

1.6600 AU

Eccentricity

0.680

Inclination

— °

Year Length

A year here lasts about 2.19 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.6600 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

50.500 m/s

Transit mid-time (BJD)

2,456,937.3200

Long. of periastron (ω)

82.74°

Angular separation (arcsec)

78.50000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.355

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Cochran et al. 1997

Instrument

Multiple Instruments

Publication

1997-07

Observation locale

Ground

Host System: 16 Cyg B

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,750 K — cooler than the Sun (5,778 K)

Estimated Age

7.40 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.130 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

1.011 g/cm³

Systemic radial velocity

-28.10 km/s

Rotational v·sin i

2.70 km/s

Activity index (log R'HK)

-5.080

Metallicity ratio

[Fe/H]

Distance

21.14 parsec

Light-years 68.95 ly

V-band magnitude

6.22 mag

Voyager-speed travel 1,215,905 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

47.275 mas

Total Proper Motion

211.122 mas/yr

PM Right Ascension

-134.79 mas/yr

PM Declination

-162.49 mas/yr

Galactic Cartesian (pc)

x = 0.273 · y = -0.574 · z = 0.772

Equatorial (J2000)

RA 295.46564° · Dec 50.51682°

Galactic ℓ, b

83.336° · 13.204°

Ecliptic λ, β

321.212° · 69.468°

HTM-20 index

-355575805

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes