Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 435.41 Earth masses
Surface gravity around 2.35 g
An orbital period of 466.200 days
Semi-major axis 1.3050 AU
Distance from Earth 73.46 light-years
Earth Similarity Index 0.335
Travel time at Voyager 1 speed 1,295,538 years

HD 19994 b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.210 R♃

Mass

435.41 M⊕

Mass (Jupiter)

1.370 M♃

Density

0.95 g/cm³

Surface Gravity

2.35 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.335

HZ Position Unknown

Controversial No

Discovery

Year 2003

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 79498 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HIP 14810 c 13.60 R⊕

Metric	Earth	HD 19994 b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	435.41	317.83
Density (g/cm³)	5.51	0.95	1.33
Surface Gravity (g)	1.00	2.35	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	435.410 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 19994

HIP

HIP 14954

TIC

TIC 49845357

Gaia DR2

Gaia DR2 3265335443260522112

Gaia DR3

Gaia DR3 3265335443260522112

System

HD 19994

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 435.410 M⊕ · percentile 45 / cohort 1747

Orbital period 466.20 d · percentile 66 / cohort 1533

Distance 22.52 pc · percentile 5 / cohort 1759

ESI 0.335 · percentile 66 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

466.200 days

Semi-major axis

1.3050 AU

Eccentricity

0.063

Inclination

— °

Year Length

A year here lasts about 1.28 Earth years on a nearly circular orbit at a mean orbital distance of 1.3050 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.335

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayor et al. 2004

Instrument

CORALIE Spectrograph

Publication

2004-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2003 at La Silla Observatory (11 shown).

HD 169830 c · Gas Giant HD 111232 b · Gas Giant HD 82943 c · Gas Giant HD 142415 b · Gas Giant HD 82943 b · Gas Giant HD 121504 b · Gas Giant HD 114386 b · Gas Giant HD 65216 b · Gas Giant HD 41004 B b · Gas Giant HD 216770 b · Gas Giant HD 6434 b · Gas Giant

Host System: HD 19994

Spectral Class

F-type yellow-white

Effective Temperature

6,188 K — hotter than the Sun (5,778 K)

Estimated Age

2.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.796 R☉

Stellar Mass

1.365 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.290 dex

Stellar density

0.277 g/cm³

Systemic radial velocity

19.00 km/s

Rotational v·sin i

8.60 km/s

Activity index (log R'HK)

-4.880

Metallicity ratio

[Fe/H]

Distance

22.52 parsec

Light-years 73.46 ly

V-band magnitude

5.06 mag

Voyager-speed travel 1,295,538 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

44.370 mas

Total Proper Motion

205.298 mas/yr

PM Right Ascension

193.25 mas/yr

PM Declination

-69.29 mas/yr

Galactic Cartesian (pc)

x = 0.666 · y = 0.745 · z = -0.021

Equatorial (J2000)

RA 48.19432° · Dec -1.19640°

Galactic ℓ, b

181.505° · -47.341°

Ecliptic λ, β

45.380° · -18.397°

HTM-20 index

-595753874

Observation Record

Photometric series

RV measurements

Archive notes