Key parameters at a glance

A radius of 9.60 Earth radii
A mass of 66.74 Earth masses
Surface gravity around 0.72 g
An orbital period of 48.056 days
Semi-major axis 0.2690 AU
Distance from Earth 161.17 light-years
Earth Similarity Index 0.314
Travel time at Voyager 1 speed 2,842,267 years

1 sibling around HD 107148

HD 107148 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 107148 c	Neptune-like	4.70	19.90	18.327	—	2021
HD 107148 b this	Neptune-like	9.60	66.74	48.056	—	2005

HD 107148 b Planet Profile

Physical Specs

Radius

9.60 R⊕

Radius (Jupiter)

0.856 R♃

Mass

66.74 M⊕

Mass (Jupiter)

0.210 M♃

Density

0.42 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.314

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#33of 574

top 5.6%

This planet

9.60R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 76700 b 9.60 R⊕ GJ 9066 c 9.60 R⊕ KMT-2021-BLG-0240L b 9.60 R⊕

Metric	Earth	HD 107148 b	Jupiter
Radius (R⊕)	1.00	9.60	11.21
Mass (M⊕)	1.00	66.74	317.83
Density (g/cm³)	5.51	0.42	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	66.741 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 107148

HIP

HIP 60081

TIC

TIC 66666079

Gaia DR2

Gaia DR2 3693358861640279296

Gaia DR3

Gaia DR3 3693358861640279296

System

HD 107148

Percentile among Neptune-like cohort

Radius 9.600 R⊕ · percentile 94 / cohort 574

Mass 66.741 M⊕ · percentile 83 / cohort 574

Orbital period 48.06 d · percentile 69 / cohort 524

Distance 49.42 pc · percentile 16 / cohort 572

ESI 0.314 · percentile 53 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

48.056 days

Semi-major axis

0.2690 AU

Eccentricity

0.050

Inclination

— °

Year Length

A year here lasts approximately 48.06 Earth days (13.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2690 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

10.900 m/s

Transit mid-time (BJD)

2,456,091.9000

Long. of periastron (ω)

75.00°

Angular separation (arcsec)

5.44000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.314

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Butler et al. 2006

Instrument

HIRES Spectrometer

Publication

2006-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2005 at W. M. Keck Observatory (12 shown).

GJ 876 d · Sub-Neptune HD 190360 c · Neptune-like HIP 14810 b · Gas Giant HD 128311 c · Gas Giant HD 66428 b · Gas Giant HD 50499 b · Gas Giant HD 108874 c · Gas Giant HD 109749 b · Gas Giant HD 37124 d · Gas Giant HD 11964 b · Gas Giant HD 99109 b · Gas Giant HD 164922 b · Gas Giant

Host System: HD 107148

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,797 K — hotter than the Sun (5,778 K)

Estimated Age

5.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.169 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

0.31

Extended Stellar Properties

Surface gravity (log g)

4.446 dex

Stellar density

0.932 g/cm³

Systemic radial velocity

25.13 km/s

Rotational v·sin i

0.73 km/s

Activity index (log R'HK)

-5.030

Metallicity ratio

[Fe/H]

Distance

49.42 parsec

Light-years 161.17 ly

V-band magnitude

8.01 mag

Voyager-speed travel 2,842,267 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

20.208 mas

Total Proper Motion

72.442 mas/yr

PM Right Ascension

-54.79 mas/yr

PM Declination

-47.39 mas/yr

Galactic Cartesian (pc)

x = -0.995 · y = -0.084 · z = -0.058

Equatorial (J2000)

RA 184.80598° · Dec -3.31999°

Galactic ℓ, b

287.371° · 58.575°

Ecliptic λ, β

185.724° · -1.138°

HTM-20 index

-283041669

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes