Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,551.00 Earth masses
Surface gravity around 9.32 g
An orbital period of 1,617.700 days
Semi-major axis 2.8850 AU
Distance from Earth 167.19 light-years
Earth Similarity Index 0.428
Travel time at Voyager 1 speed 2,948,410 years

Context from the literature

HD 11506 b is an extrasolar planet that orbits the star HD 11506 167 light years away in the constellation of Cetus. This planet was discovered in 2007 by the N2K Consortium using the Keck telescope to detect the radial velocity variation of the star caused by the planet. A second planet, HD 11506 c, was discovered in 2015.

Excerpted from Wikipedia · full article

2 siblings around HD 11506

HD 11506 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 11506 c	Gas Giant	14.00	127.13	223.920	—	2008
HD 11506 b this	Gas Giant	12.90	1,551.00	1,617.700	—	2007
HD 11506 d	Gas Giant	12.30	4,068.20	26,500.000	—	2022

HD 11506 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,551.00 M⊕

Mass (Jupiter)

4.880 M♃

Density

3.97 g/cm³

Surface Gravity

9.32 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.428

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 11506 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,551.00	317.83
Density (g/cm³)	5.51	3.97	1.33
Surface Gravity (g)	1.00	9.32	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,551.003 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,525.576 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 11506

HIP

HIP 8770

TIC

TIC 266680498

Gaia DR2

Gaia DR2 5137855525488932864

Gaia DR3

Gaia DR3 5137855525488932864

System

HD 11506

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,551.003 M⊕ · percentile 75 / cohort 1747

Orbital period 1,617.70 d · percentile 82 / cohort 1533

Distance 51.26 pc · percentile 20 / cohort 1759

ESI 0.428 · percentile 94 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,617.700 days

Semi-major axis

2.8850 AU

Eccentricity

0.379

Inclination

112.60 °

Year Length

A year here lasts about 4.43 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.8850 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

78.500 m/s

Transit mid-time (BJD)

2,453,398.0000

Long. of periastron (ω)

-140.70°

Angular separation (arcsec)

56.30000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.428

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Fischer et al. 2007

Instrument

HIRES Spectrometer

Publication

2007-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at W. M. Keck Observatory (7 shown).

HD 125612 b · Gas Giant HD 75898 b · Gas Giant GJ 317 b · Gas Giant HD 5319 b · Gas Giant HD 231701 b · Gas Giant HD 170469 b · Gas Giant HD 175541 b · Gas Giant

Host System: HD 11506

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,123 K — hotter than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.240 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

0.30

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

0.641 g/cm³

Systemic radial velocity

-7.53 km/s

Rotational v·sin i

5.50 km/s

Rotation period

15.00 days

Activity index (log R'HK)

-5.060

Metallicity ratio

[Fe/H]

Distance

51.26 parsec

Light-years 167.19 ly

V-band magnitude

7.51 mag

Voyager-speed travel 2,948,410 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.479 mas

Total Proper Motion

100.159 mas/yr

PM Right Ascension

21.91 mas/yr

PM Declination

-97.73 mas/yr

Galactic Cartesian (pc)

x = 0.831 · y = 0.446 · z = -0.334

Equatorial (J2000)

RA 28.21066° · Dec -19.50740°

Galactic ℓ, b

187.759° · -73.995°

Ecliptic λ, β

18.376° · -28.922°

HTM-20 index

-891410030

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

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