Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 104.57 Earth masses
Surface gravity around 0.67 g
An orbital period of 18.199 days
Semi-major axis 0.1508 AU
Distance from Earth 293.09 light-years
Earth Similarity Index 0.263
Travel time at Voyager 1 speed 5,168,664 years

HD 33283 b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.120 R♃

Mass

104.57 M⊕

Mass (Jupiter)

0.329 M♃

Density

0.29 g/cm³

Surface Gravity

0.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.263

HZ Position Unknown

Controversial No

Discovery

Year 2006

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ gam1 Leo b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 33283 b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	104.57	317.83
Density (g/cm³)	5.51	0.29	1.33
Surface Gravity (g)	1.00	0.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	104.566 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 33283

HIP

HIP 23889

TIC

TIC 13147218

Gaia DR2

Gaia DR2 2955981936912654592

Gaia DR3

Gaia DR3 2955981936912654592

System

HD 33283

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 104.566 M⊕ · percentile 6 / cohort 1747

Orbital period 18.20 d · percentile 47 / cohort 1533

Distance 89.86 pc · percentile 33 / cohort 1759

ESI 0.263 · percentile 48 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

18.199 days

Semi-major axis

0.1508 AU

Eccentricity

0.399

Inclination

— °

Year Length

A year here lasts approximately 18.20 Earth days (5.0% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1508 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.263

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2006

Instrument

HIRES Spectrometer

Publication

2006-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2006 at W. M. Keck Observatory (7 shown).

HD 24040 b · Gas Giant HD 86081 b · Gas Giant HIP 14810 c · Gas Giant HD 154345 b · Gas Giant HD 10647 b · Gas Giant GJ 849 b · Gas Giant HD 224693 b · Gas Giant

Host System: HD 33283

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,935 K — hotter than the Sun (5,778 K)

Estimated Age

3.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.970 R☉

Stellar Mass

1.380 M☉

Metallicity [Fe/H]

0.35

Extended Stellar Properties

Surface gravity (log g)

4.120 dex

Stellar density

0.215 g/cm³

Systemic radial velocity

5.01 km/s

Rotational v·sin i

3.20 km/s

Metallicity ratio

[Fe/H]

Distance

89.86 parsec

Light-years 293.09 ly

V-band magnitude

8.05 mag

Voyager-speed travel 5,168,664 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.099 mas

Total Proper Motion

72.649 mas/yr

PM Right Ascension

56.18 mas/yr

PM Declination

-46.06 mas/yr

Galactic Cartesian (pc)

x = 0.201 · y = 0.870 · z = -0.451

Equatorial (J2000)

RA 77.00449° · Dec -26.79767°

Galactic ℓ, b

228.497° · -33.505°

Ecliptic λ, β

72.020° · -49.429°

HTM-20 index

-497127533

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes