Key parameters at a glance

A radius of 4.70 Earth radii
A mass of 19.90 Earth masses
Surface gravity around 0.90 g
An orbital period of 18.327 days
Semi-major axis 0.1407 AU
Distance from Earth 161.17 light-years
Earth Similarity Index 0.494
Travel time at Voyager 1 speed 2,842,267 years

Context from the literature

HD 107148 is a wide binary star system in the constellation of Virgo. A pair of exoplanets have been confirmed in orbit around the brighter star. This system is located at a distance of 161 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 25.2 K. Although having an absolute magnitude of 4.47, at that range the system is too faint to be visible with the naked eye, having an apparent visual magnitude of 8.01.

Excerpted from Wikipedia · full article

1 sibling around HD 107148

HD 107148 c 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 this	Neptune-like	4.70	19.90	18.327	—	2021
HD 107148 b	Neptune-like	9.60	66.74	48.056	—	2005

HD 107148 c Planet Profile

Physical Specs

Radius

4.70 R⊕

Radius (Jupiter)

0.420 R♃

Mass

19.90 M⊕

Mass (Jupiter)

0.063 M♃

Density

1.05 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.494

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#432of 574

top 75.1%

This planet

4.70R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

LP 714-47 b 4.70 R⊕ Kepler-318 b 4.71 R⊕ Kepler-20 g 4.71 R⊕

Metric	Earth	HD 107148 c	Jupiter
Radius (R⊕)	1.00	4.70	11.21
Mass (M⊕)	1.00	19.90	317.83
Density (g/cm³)	5.51	1.05	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	19.896 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 4.700 R⊕ · percentile 25 / cohort 574

Mass 19.896 M⊕ · percentile 28 / cohort 574

Orbital period 18.33 d · percentile 50 / cohort 524

Distance 49.42 pc · percentile 16 / cohort 572

ESI 0.494 · percentile 89 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

18.327 days

Semi-major axis

0.1407 AU

Eccentricity

0.340

Inclination

— °

Year Length

A year here lasts approximately 18.33 Earth days (5.0% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1407 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

4.840 m/s

Transit mid-time (BJD)

2,455,203.4000

Long. of periastron (ω)

-44.69°

Angular separation (arcsec)

2.85000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.494

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Rosenthal et al. 2021

Instrument

Multiple Instruments

Publication

2021-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Multiple Observatories (12 shown).

L 98-59 e · Super-Earth GJ 393 b · Rocky Terrestrial HD 168009 b · Sub-Neptune HD 164922 e · Sub-Neptune HD 95735 c · Sub-Neptune HD 141004 b · Sub-Neptune TOI-178 f · Sub-Neptune TYC 0434-04538-1 b · Gas Giant HIP 56640 b · Gas Giant HD 137496 c · Gas Giant HD 156668 c · Neptune-like HD 145675 c · Gas Giant

Host System: HD 107148

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,753 K — cooler 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

1.105 M☉

Metallicity [Fe/H]

0.30

Extended Stellar Properties

Surface gravity (log g)

4.345 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

Wikipedia →