Planet 55 Cnc Bb

Detailed information about planet 55 Cnc Bb and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

55 Cnc Bb

Planet Status

Confirmed

Discovered in

2025

Publication Status

Published in a refereed paper

Update

2025-10-14

Mass

—

Mass*sin(i)

0.011 (\pm 0.0025)

M_J 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Semi-Major Axis

0.044 (\pm 0.0012)

AU 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Orbital Period

6.7994 (\begin{matrix} + 0.0013 \\ - 0.0014 \end{matrix})

day 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Eccentricity

0.0 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Angular distance

—

ω

—

T_peri

—

Radius

—

Inclination

—

Detection Method

Radial Velocity

Mass Meas. Method

Radial Velocity

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

2.89 (\begin{matrix} + 0.61 \\ - 0.63 \end{matrix})

m/s 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

rho1 Cnc Bb

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

Star

Name

55 Cnc B

Distance

12.477 (\pm 0.017)

pc 1 publication

The Revised TESS Input Catalog and Candidate Target List

Spectral type

M4.5V

Apparent magnitude V

13.1

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

0.26 (\pm 0.02)

M_Sun 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Age

—

Effective temperature

3286.0 (\pm 31.0)

K 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Radius

0.274 (\pm 0.066)

R_Sun 1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Metallicity [Fe/H]

0.16 (\pm 0.1)

1 publication

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

08:52:40.9

Dec₂₀₀₀

+28:18:58.8

Alternate Names

rho1 Cnc B, GJ 324 B

Secondary component of a widely separated binary system (a = 1065 AUs) including renowned exoplanet host star 55 Cnc A (aka rho1 Cnc A, spT G8V).

No link

Simbad
Most recent references (ADS)

Planet 55 Cnc Bb

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks Some remarks

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 2 planets

Remarks Some remarks

Other web pages No page

More data 2 references

Planet 55 Cnc Bb

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks Some remarks

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 2 planets

Remarks Some remarks

Other web pages No page

More data 2 references

Related publications

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B

The Revised TESS Input Catalog and Candidate Target List