Planet TYC 3801-1529-1 Ab

Detailed information about planet TYC 3801-1529-1 Ab and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

TYC 3801-1529-1 Ab

Planet Status

Controversial

Discovered in

2026

Publication Status

Published in a refereed paper

Update

2026-01-10

Mass

50.0

M_J 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Mass*sin(i)

—

Semi-Major Axis

0.01283 AU 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Orbital Period

0.36591569 day 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Eccentricity

—

Angular distance

—

ω

—

T_peri

—

Radius

3.78

R_J 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Inclination

64.31 (\begin{matrix} + 61.0 \\ - 58.0 \end{matrix})

deg 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Detection Method

Primary Transit

Mass Meas. Method

Radial Velocity

Radius Meas. Method

Primary Transit

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

6160.0 K 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

Measured temperature

5871.0

K 1 publication

Detailed Investigation of a W UMa Contact Binary with an Ultralow Mass Ratio and a Third-Body as a Potential Merger Candidate

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

The secondary star of the system shows a mass below stellar-substellar boundary (q = 0.024) making it an extreme object similar to EF Eridani B, a former star that lost most of its mass by transfer ceasing any thermonuclear process.
Hence TYC 3801-1529-1 (A)b along with the secondary of another similar system (e.g. SX Crv) appears a truly exotic object, halfway between a true star and a brown dwarf.

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