Planet UX Tau Ab

Detailed information about planet UX Tau Ab and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

UX Tau Ab

Planet Status

Confirmed

Discovered in

1991

Publication Status

Published in a refereed paper

Update

2025-08-23

Mass

—

Mass*sin(i)

70.0 (\pm 30.0)

M_J 1 publication

Tidal Interaction between the UX Tauri A/C Disk System Revealed by ALMA

Semi-Major Axis

360.0 AU 1 publication

Tidal Interaction between the UX Tauri A/C Disk System Revealed by ALMA

Orbital Period

—

Eccentricity

—

Angular distance

2.7

arcsec

ω

—

T_peri

—

Radius

6.8

R_J 1 publication

An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties

Inclination

—

Detection Method

Imaging

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

3125.0 K 1 publication

The Coevality of Young Binary Systems

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

UX Tau C, HD 285846 C, HBC 43 C

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

Spectral type M5. A tenuous disk (m_disk ≤ 0.05 M_E) surrounds the companion.

No link

Star

Name

UX Tau A

Distance

147.0 (\pm 2.0)

pc 1 publication

Ongoing flyby in the young multiple system UX Tauri

Spectral type

K2Ve

Apparent magnitude V

11.1

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

1.4 (\pm 0.6)

M_Sun 4 publications

Ongoing flyby in the young multiple system UX Tauri
An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations
Tidal Interaction between the UX Tauri A/C Disk System Revealed by ALMA

Age

0.0015 (\pm 0.0005)

Gyr 2 publications

Ongoing flyby in the young multiple system UX Tauri
The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations

Effective temperature

4710.0 K 1 publication

The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations

Radius

1.74 R_Sun 1 publication

An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties

Metallicity [Fe/H]

—

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

04:30:04.0

Dec₂₀₀₀

+18:13:49.4

Alternate Names

HD 285846 A, HBC 43

Young multiple system including a K-type protostar with an M-type companion (UX Tau B, spT M2Ve) 5.8 arcseconds away (852 AUs at 147 pc), itself binary made of similar components (m_Ba = 0.5 M_Sol and m_Bb = 0.4 M_Sol) separated by about 0.1 arcseconds (~15 AUs at 147 pc). An additional component, UX Tau C, is generally assumed to be a very low mass star (m_C = 0.16 M_Sol) but actual mass range is between 40 and 100 M_Jup, hence within substellar domain.