Planet KPNO-Tau 2

Detailed information about planet KPNO-Tau 2 and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

KPNO-Tau 2

Planet Status

Confirmed

Discovered in

2002

Publication Status

Published in a refereed paper

Update

2025-08-16

Mass

40.0

M_J 1 publication

Multiplicity and Optical Excess across the Substellar Boundary in Taurus

Mass*sin(i)

—

Semi-Major Axis

22288.0 AU 1 publication

Multiplicity and clustering in Taurus star-forming region. I. Unexpected ultra-wide pairs of high-order multiplicity in Taurus

Orbital Period

—

Eccentricity

—

Angular distance

159.37

arcsec

ω

—

T_peri

—

Radius

3.9

R_J 1 publication

Multiplicity and Optical Excess across the Substellar Boundary in Taurus

Inclination

—

Detection Method

Imaging

Mass Meas. Method

Spectrum

Radius Meas. Method

Flux

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

2927.0 K

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

2MASS J04185115+2814332, IRAS 04158+2805 b

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

Spectral type M7.5e. L = 0.01 L_Sol. Member of Taurus-Auriga star-forming region. Age 1-2 Myr.
Joncour et al. (2017) deem KPNO-Tau 2 and KPNO-Tau 12 to be gravitationally bound to protostar IRAS 04158+2805 being located 22,288 and 80,679 AUs away respectively. Likely physical association to close binary LkCa 7 (1470 arcseconds away, ~191,000 AUs at 130 pc) could increase system complexity.

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Star

Name

IRAS 04158+2805

Distance

130.0 pc

Spectral type

M5.25

Apparent magnitude V

—

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

0.376 (\pm 0.027)

M_Sun 1 publication

The Revised TESS Input Catalog and Candidate Target List

Age

—

Effective temperature

2974.0 (\pm 160.0)

K 1 publication

The Revised TESS Input Catalog and Candidate Target List

Radius

0.386 (\pm 0.02)

R_Sun 1 publication

The Revised TESS Input Catalog and Candidate Target List

Metallicity [Fe/H]

—

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

04:18:58.1

Dec₂₀₀₀

+28:12:23.4

Alternate Names

Likely tertiary companion of young binary LkCa 7 1470 arcseconds away (~191,000 AUs at 130 pc). LkCa 7 is a pair of M-type protostars (m₁ = 0.64 M_Sol and m₂ = 0.33 M_Sol) separated by 148 AUs (Kraus et al. 2011).

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