Key parameters at a glance

A radius of 1.77 Earth radii
A mass of 3.79 Earth masses
Surface gravity around 1.21 g
An orbital period of 12.949 days
Semi-major axis 0.1061 AU
Distance from Earth 56.97 light-years
Earth Similarity Index 0.831
Travel time at Voyager 1 speed 1,004,666 years

2 siblings around rho CrB

rho CrB e shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
rho CrB e this	Super-Earth	1.77	3.79	12.949	—	2023
rho CrB c	Neptune-like	5.78	28.20	102.190	448	2016
rho CrB d	Neptune-like	4.94	21.60	282.200	—	2023

rho CrB e Planet Profile

Physical Specs

Radius

1.77 R⊕

Radius (Jupiter)

0.158 R♃

Mass

3.79 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.76 g/cm³

Surface Gravity

1.21 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.831

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Lowell Observatory

Telescope 4.3 m Lowell Discovery Telescope

Size rank in cohort

Rank by radius

#293of 1176

top 24.8%

This planet

1.77R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

GJ 667 C c 1.77 R⊕ Kepler-286 e 1.77 R⊕ Kepler-215 c 1.77 R⊕

Metric	Earth	rho CrB e	Jupiter
Radius (R⊕)	1.00	1.77	11.21
Mass (M⊕)	1.00	3.79	317.83
Density (g/cm³)	5.51	3.76	1.33
Surface Gravity (g)	1.00	1.21	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	3.790 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 143761

HIP

HIP 78459

TIC

TIC 458494003

Gaia DR2

Gaia DR2 1323427759184545536

Gaia DR3

Gaia DR3 1323427759184545536

System

rho CrB

Percentile among Super-Earth cohort

Radius 1.770 R⊕ · percentile 73 / cohort 1176

Mass 3.790 M⊕ · percentile 68 / cohort 1176

Orbital period 12.95 d · percentile 72 / cohort 1164

Distance 17.47 pc · percentile 4 / cohort 1171

ESI 0.831 · percentile 92 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

12.949 days

Semi-major axis

0.1061 AU

Eccentricity

0.126

Inclination

— °

Year Length

A year here lasts approximately 12.95 Earth days (3.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1061 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

1.140 m/s

Transit mid-time (BJD)

2,455,498.5000

Long. of periastron (ω)

-0.60°

Angular separation (arcsec)

6.07000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.831

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Brewer et al. 2023

Instrument

EXPRES spectrograph

Publication

2023-08

Observation locale

Ground

Host System: rho CrB

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,817 K — hotter than the Sun (5,778 K)

Estimated Age

10.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.340 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

4.250 dex

Stellar density

0.646 g/cm³

Systemic radial velocity

17.80 km/s

Rotational v·sin i

0.80 km/s

Activity index (log R'HK)

-5.080

Metallicity ratio

[Fe/H]

Distance

17.47 parsec

Light-years 56.97 ly

V-band magnitude

5.41 mag

Voyager-speed travel 1,004,666 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

57.222 mas

Total Proper Motion

797.522 mas/yr

PM Right Ascension

-198.54 mas/yr

PM Declination

-772.42 mas/yr

Galactic Cartesian (pc)

x = -0.415 · y = -0.726 · z = 0.549

Equatorial (J2000)

RA 240.26006° · Dec 33.30019°

Galactic ℓ, b

53.484° · 48.924°

Ecliptic λ, β

227.177° · 52.410°

HTM-20 index

1280940784

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes