Key parameters at a glance

A mass of 1,398.44 Earth masses
An orbital period of 3,947.000 days
Semi-major axis 4.1700 AU
Distance from Earth 50.87 light-years
Travel time at Voyager 1 speed 897,165 years

3 siblings around HD 160691

HD 160691 c 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 160691 d	Sub-Neptune	3.23	10.49	9.639	900	2004
HD 160691 e	Unclassified	—	2,224.80	307.900	—	2006
HD 160691 b	Unclassified	—	1,366.66	645.000	—	2000
HD 160691 c this	Unclassified	—	1,398.44	3,947.000	—	2004

HD 160691 c Planet Profile

Physical Specs

Radius

— R⊕

Radius (Jupiter)

— R♃

Mass

1,398.44 M⊕

Mass (Jupiter)

4.400 M♃

Density

— g/cm³

Surface Gravity

— g (Earth)

Classification

Planet Type

Unclassified

ESI Score —

HZ Position Unknown

Controversial No

Discovery

Year 2004

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Metric	Earth	HD 160691 c	Jupiter
Radius (R⊕)	1.00	—	11.21
Mass (M⊕)	1.00	1,398.44	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	—	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,398.445 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	719.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 160691

HIP

HIP 86796

TIC

TIC 362661163

Gaia DR2

Gaia DR2 5945941905576552064

Gaia DR3

Gaia DR3 5945941905576552064

System

HD 160691

Percentile among Unclassified cohort

Mass 1,398.445 M⊕ · percentile 38 / cohort 42

Orbital period 3,947.00 d · percentile 91 / cohort 43

Distance 15.60 pc · percentile 7 / cohort 43

Orbit & Habitability

Orbital Dynamics

Period

3,947.000 days

Semi-major axis

4.1700 AU

Eccentricity

0.039

Inclination

60.00 °

Year Length

A year here lasts about 10.81 Earth years on a nearly circular orbit at a mean orbital distance of 4.1700 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

22.180 m/s

Transit mid-time (BJD)

2,453,237.0000

Long. of periastron (ω)

84.00°

Angular separation (arcsec)

267.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

—

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mccarthy et al. 2004

Instrument

UCLES Spectrograph

Publication

2004-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2004 at Anglo-Australian Telescope (3 shown).

HD 154857 b · Gas Giant HD 117618 b · Neptune-like HD 208487 b · Gas Giant

Host System: HD 160691

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,773 K — cooler than the Sun (5,778 K)

Estimated Age

5.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.330 R☉

Stellar Mass

1.130 M☉

Metallicity [Fe/H]

0.28

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.555 g/cm³

Systemic radial velocity

-9.29 km/s

Rotational v·sin i

3.10 km/s

Activity index (log R'HK)

-5.020

Metallicity ratio

[Fe/H]

Distance

15.60 parsec

Light-years 50.87 ly

V-band magnitude

5.12 mag

Voyager-speed travel 897,165 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

64.082 mas

Total Proper Motion

191.532 mas/yr

PM Right Ascension

-15.31 mas/yr

PM Declination

-190.92 mas/yr

Galactic Cartesian (pc)

x = -0.043 · y = -0.616 · z = -0.786

Equatorial (J2000)

RA 266.03616° · Dec -51.83488°

Galactic ℓ, b

340.060° · -11.499°

Ecliptic λ, β

267.212° · -28.434°

HTM-20 index

1868394459

Observation Record

Photometric series

RV measurements

Archive notes