Planet HIP 81208 Ab

Detailed information about planet HIP 81208 Ab and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

HIP 81208 Ab

Planet Status

Confirmed

Discovered in

2023

Update

2024-12-17

Mass

67.0 (\begin{matrix} + 6.0 \\ - 7.0 \end{matrix})

M_J 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Mass*sin(i)

—

Semi-Major Axis

53.98 (\begin{matrix} + 32.22 \\ - 15.0 \end{matrix})

AU 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Orbital Period

89103.8 (\pm 58470.0)

day 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Eccentricity

0.33 (\begin{matrix} + 0.26 \\ - 0.22 \end{matrix})

1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

ω

—

T_peri

—

Radius

—

Inclination

46.61 (\begin{matrix} + 15.71 \\ - 19.47 \end{matrix})

deg 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Detection Method

Imaging

Mass Meas. Method

Astrometry

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

2895.0 (\begin{matrix} + 45.0 \\ - 40.0 \end{matrix})

K 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

HIP 81208 B

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

Spectral type M5.

No link

Star

Name

HIP 81208 A

Distance

148.7 (\begin{matrix} + 1.5 \\ - 1.3 \end{matrix})

pc 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Spectral type

B9V

Apparent magnitude V

6.63

Mass

2.58 (\pm 0.06)

M_Sun 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Age

0.017 (\begin{matrix} + 0.003 \\ - 0.004 \end{matrix})

Gyr

Effective temperature

10840.0 (\pm 220.0)

K 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Radius

2.213 (\pm 0.121)

R_Sun 1 publication

BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208

Metallicity [Fe/H]

—

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

16:35:13.8

Dec₂₀₀₀

-35:43:28.7

Alternate Names

HD 149274, TYC 7357-207-1

An M dwarf companion star (HIP 81208 C*, m = 0.135_-0.013^+0.01 M_Sol, spT M4V) lies in outer eccentric orbit (a = 234.27_-68.96^168.65 AUs, e = 0.38, i = 128.16°). This companion star in turn hosts an imaged exoplanet 23 AUs away, it too showing eccentric orbit (e = 0.33).
*Note: Companion star HIP 81208 is labelled by discoverers as "C" with inner brown dwarf companion to primary star labelled as "B". If the latter is regarded as "HIP 81208 Ab", the companion star becomes "B". Moreover an additional common proper motion M dwarf companion star (2MASS J16360769-3543514) lies 148.7 arcseconds away (97,580 AUs at 148.7 pc) and this one should be hence regarded either as "HIP 81208 C" or "D".