Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 495.80 Earth masses
Surface gravity around 2.72 g
An orbital period of 428.100 days
Semi-major axis 1.2710 AU
Distance from Earth 59.59 light-years
Earth Similarity Index 0.346
Travel time at Voyager 1 speed 1,050,870 years

HD 27442 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

495.80 M⊕

Mass (Jupiter)

1.560 M♃

Density

1.11 g/cm³

Surface Gravity

2.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.346

HZ Position Unknown

Controversial No

Discovery

Year 2000

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

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 66428 c 13.50 R⊕ HD 82943 b 13.50 R⊕

Metric	Earth	HD 27442 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	495.80	317.83
Density (g/cm³)	5.51	1.11	1.33
Surface Gravity (g)	1.00	2.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	495.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 27442

HIP

HIP 19921

TIC

TIC 198079199

Gaia DR2

Gaia DR2 4678664766394767616

Gaia DR3

Gaia DR3 4678664766393829504

System

HD 27442

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 495.800 M⊕ · percentile 48 / cohort 1747

Orbital period 428.10 d · percentile 65 / cohort 1533

Distance 18.27 pc · percentile 3 / cohort 1759

ESI 0.346 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

428.100 days

Semi-major axis

1.2710 AU

Eccentricity

0.060

Inclination

— °

Year Length

A year here lasts about 1.17 Earth years on a nearly circular orbit at a mean orbital distance of 1.2710 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.346

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Butler et al. 2001

Instrument

UCLES Spectrograph

Publication

2001-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2000 at Anglo-Australian Telescope (2 shown).

HD 179949 b · Gas Giant HD 160691 b · Unclassified

Host System: HD 27442

Spectral Class

K-type orange

Effective Temperature

4,846 K — cooler than the Sun (5,778 K)

Estimated Age

10.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

3.180 R☉

Stellar Mass

1.230 M☉

Metallicity [Fe/H]

0.42

Extended Stellar Properties

Surface gravity (log g)

3.783 dex

Systemic radial velocity

29.03 km/s

Rotational v·sin i

2.80 km/s

Metallicity ratio

[Fe/H]

Distance

18.27 parsec

Light-years 59.59 ly

V-band magnitude

4.44 mag

Voyager-speed travel 1,050,870 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

54.705 mas

Total Proper Motion

174.613 mas/yr

PM Right Ascension

-48.30 mas/yr

PM Declination

-167.80 mas/yr

Galactic Cartesian (pc)

x = 0.223 · y = 0.459 · z = -0.860

Equatorial (J2000)

RA 64.12055° · Dec -59.30288°

Galactic ℓ, b

270.205° · -42.563°

Ecliptic λ, β

19.601° · -76.318°

HTM-20 index

1813072067

Observation Record

Photometric series

RV measurements

Archive notes

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Anglo-Australian Telescope Mission K-type orange Hosts