Confirmed Exoplanet Discovered 2016

rho CrB c

A neptune-like orbiting the g-type yellow (sun-like) rho CrB, located approximately 57.0 light-years from Earth.

Key parameters at a glance

  • A radius of 5.78 Earth radii
  • A mass of 28.20 Earth masses
  • Surface gravity around 0.84 g
  • An orbital period of 102.190 days
  • Semi-major axis 0.4206 AU
  • Equilibrium temperature 448 K (175 °C)
  • Distance from Earth 56.97 light-years
  • Earth Similarity Index 0.381
  • Travel time at Voyager 1 speed 1,004,666 years

2 siblings around rho CrB

rho CrB c 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 Super-Earth 1.77 3.79 12.949 — 2023
rho CrB c this Neptune-like 5.78 28.20 102.190 448 2016
rho CrB d Neptune-like 4.94 21.60 282.200 — 2023

rho CrB c Planet Profile

Physical Specs

Radius
5.78 R⊕
Radius (Jupiter)
0.515 R♃
Mass
28.20 M⊕
Mass (Jupiter)
0.089 M♃
Density
0.80 g/cm³
Surface Gravity
0.84 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.381
HZ Position Inner
Controversial No

Discovery

Year 2016
Method Radial Velocity
Facility Multiple Observatories
Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#299of 574

top 51.9%

This planet

5.78R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-101 b 5.77 R⊕ Kepler-1520 b 5.77 R⊕ EPIC 211945201 b 5.76 R⊕
Metric Earth rho CrB c Jupiter
Radius (R⊕)1.005.7811.21
Mass (M⊕)1.0028.20317.83
Density (g/cm³)5.510.801.33
Surface Gravity (g)1.000.842.53
Insolation (S⊕)1.009.850.037

Alternative Mass Estimates

Method Value Interpretation
Minimum mass (M sin i) 28.200 M⊕ Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD

HD 143761

HIP

HIP 78459

TIC

TIC 458494003

Gaia DR2

Gaia DR2 1323427759184545536

Gaia DR3

Gaia DR3 1323427759184545536

System

rho CrB

Percentile among Neptune-like cohort

Radius 5.780 R⊕ · percentile 48 / cohort 574
Mass 28.200 M⊕ · percentile 47 / cohort 574
Orbital period 102.19 d · percentile 82 / cohort 524
Distance 17.47 pc · percentile 4 / cohort 572
ESI 0.381 · percentile 70 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period
102.190 days
Semi-major axis
0.4206 AU
Eccentricity
0.096
Inclination
— °

Year Length

A year here lasts approximately 102.19 Earth days (28.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4206 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

65.100

RV semi-amplitude (K)

4.000 m/s

Transit mid-time (BJD)

2,455,629.3000

Long. of periastron (ω)

9.70°

Angular separation (arcsec)

24.10000

Eq. Temperature

448K

(175 °C)

Insolation (S⊕)

9.85

Earth = 1.00

Earth Similarity (ESI)

0.381

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Fulton et al. 2016

Instrument

Multiple Instruments

Publication

2016-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at Multiple Observatories (12 shown).

HD 42618 b · Sub-Neptune HD 164922 c · Sub-Neptune HD 224538 b · Gas Giant HD 30177 c · Gas Giant Kepler-56 d · Gas Giant HD 72892 b · Gas Giant HD 147873 b · Gas Giant HIP 8541 b · Gas Giant HD 68402 b · Gas Giant HD 86950 b · Gas Giant HD 165155 b · Gas Giant HIP 74890 b · Gas Giant

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

3.66.06.00B5.41V5.24Gaia4.82TESS4.09J3.99H3.86K3.90W13.59W23.90W33.85W4

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

1

RV measurements

1

Stellar spectra

2

Archive notes

1

Similar Worlds

Kepler-101 b

Neptune-like · G-type yellow (Sun-like)

Radius 5.77 R⊕ · 3,026.7 ly

EPIC 211945201 b

Neptune-like · G-type yellow (Sun-like)

Radius 5.76 R⊕ · 592.6 ly

DS Tuc A b

Neptune-like · G-type yellow (Sun-like)

Radius 5.70 R⊕ · 143.7 ly

HD 134060 c

Neptune-like · G-type yellow (Sun-like)

Radius 5.91 R⊕ · 78.3 ly

TIC 434398831 c

Neptune-like · G-type yellow (Sun-like)

Radius 5.63 R⊕ · 707.8 ly

Kepler-827 b

Neptune-like · G-type yellow (Sun-like)

Radius 5.63 R⊕ · 6,675.4 ly

Explore Related Categories

Neptune-like Planets Radial Velocity Discoveries Multiple Observatories Mission G-type yellow (Sun-like) Hosts