Planet Kepler-21 Ac

Detailed information about planet Kepler-21 Ac and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

Kepler-21 Ac

Planet Status

Candidate

Discovered in

2024

Update

2024-08-07

Mass

4.0 (\begin{matrix} + 2.4 \\ - 1.3 \end{matrix})

M_J

Mass*sin(i)

4.0 (\begin{matrix} + 2.4 \\ - 1.3 \end{matrix})

M_J 1 publication

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

Semi-Major Axis

17.7 (\pm 1.6)

AU 1 publication

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

Orbital Period

22885.5 (\begin{matrix} + 18104.0 \\ - 7957.0 \end{matrix})

day 1 publication

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

Eccentricity

—

ω

—

T_peri

—

Radius

—

Inclination

90.0 deg 1 publication

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

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

—

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

—

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

Kepler-21 A

Distance

108.522 (\pm 0.3835)

pc 1 publication

The Revised TESS Input Catalog and Candidate Target List

Spectral type

F6IV

Apparent magnitude V

8.27

Mass

1.408 (\begin{matrix} + 0.021 \\ - 0.03 \end{matrix})

M_Sun 1 publication

Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems

Age

2.84 (\pm 0.35)

Gyr 1 publication

Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems

Effective temperature

6305.0 (\pm 50.0)

K 1 publication

Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems

Radius

1.902 (\begin{matrix} + 0.018 \\ - 0.012 \end{matrix})

R_Sun 1 publication

Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems

Metallicity [Fe/H]

-0.03 (\pm 0.1)

1 publication

Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

19:09:26.8

Dec₂₀₀₀

+38:42:50.5

Alternate Names

Kepler-21, BD+38 3455, WISE J190926.86+384250.7, HD 179070, HIP 94112, KOI-975, KIC 3632418, SAO 67891, TIC 121214185, TYC 3120-00963-1, 2MASS J19092683+3842505

Ginski et al. (2012) detect a comoving M dwarf companion star 0.756 arcseconds away (81.6 to 87 AUs at 108 pc). Furlan et al. (2017) report a way fainter additional companion 1.084 arcseconds away (117 AUs at 108 pc). Estimated luminosity for this latter object seems compatible with either a very low-mass M dwarf star or an L-type brown dwarf.

No link