Planet K2-21 b

Detailed information about planet K2-21 b and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

K2-21 b

Planet Status

Confirmed

Discovered in

2015

Update

2023-05-22

Mass

0.00623 (\pm 0.0012)

M_J

Mass*sin(i)

—

Semi-Major Axis

0.076 (\begin{matrix} + 0.002 \\ - 0.003 \end{matrix})

AU 1 publication

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

Orbital Period

9.00315 (\pm 2e-05)

day 2 publications

The 14 Her Planetary System: Companion Masses and Architecture from Radial Velocities and Astrometry
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

Eccentricity

0.1 (\begin{matrix} + 0.148654 \\ - 0.084698 \end{matrix})

1 publication

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

ω

34.48 (\begin{matrix} + 101.8842 \\ - 133.739 \end{matrix})

deg 1 publication

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

T_peri

—

Radius

0.164 (\begin{matrix} + 0.009 \\ - 0.009 \end{matrix})

R_J 1 publication

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

Inclination

88.66 (\pm 0.4)

deg 2 publications

The 14 Her Planetary System: Companion Masses and Architecture from Radial Velocities and Astrometry
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

Detection Method

Primary Transit

Mass Meas. Method

TTV

Radius Meas. Method

Primary Transit

Primary transit

2456989.4239 (\begin{matrix} + 0.0025 \\ - 0.002 \end{matrix})

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

2MASS J22411288-1429202 b, EPIC 206011691 b, EPIC 206011691.01, WISE J224112.90-142921.1 b

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

No remarks

No link

Star

Name

K2-21

Distance

83.85 (\begin{matrix} + 0.26 \\ - 0.26 \end{matrix})

Spectral type

M0.0

Apparent magnitude V

12.85

Mass

0.68 (\begin{matrix} + 0.07 \\ - 0.07 \end{matrix})

M_Sun

Age

—

Effective temperature

4222.06 (\begin{matrix} + 88.15 \\ - 84.41 \end{matrix})

Radius

0.65 (\begin{matrix} + 0.03 \\ - 0.03 \end{matrix})

R_Sun

Metallicity [Fe/H]

-0.11 (\pm 0.13)

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

22:41:12.9

Dec₂₀₀₀

-14:29:20.4

Alternate Names

2MASS 22411288-1429202, 2MASS J22411288-1429202, EPIC 206011691, WISE J224112.90-142921.1

No remarks

No link

Simbad
Most recent references (ADS)

Planet K2-21 b

Planet

Basic informations 28 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 13 parameters

Planetary system 2 planets

Remarks No remark

Other web pages No page

More data 2 references

Planet K2-21 b

Planet

Basic informations 28 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 13 parameters

Planetary system 2 planets

Remarks No remark

Other web pages No page

More data 2 references

Related publications

The 14 Her Planetary System: Companion Masses and Architecture from Radial Velocities and Astrometry

Mass derivation of planets K2-21b and K2-21c from transit timing variations

High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016

Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars II: Planetary Systems Observed During Campaigns 1-7

Two Transiting Earth-size Planets Near Resonance Orbiting a Nearby Cool Star