Planet Sirius Bb

Detailed information about planet Sirius Bb and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

Sirius Bb

Planet Status

Candidate

Discovered in

2024

Update

2024-09-26

Mass

1.5 (\pm 0.5)

M_J 1 publication

Searching for substellar companion candidates with Gaia. I. Introducing the GaiaPMEX tool

Mass*sin(i)

—

Semi-Major Axis

0.9 (\pm 0.4)

AU 1 publication

Searching for substellar companion candidates with Gaia. I. Introducing the GaiaPMEX tool

Orbital Period

—

Eccentricity

—

ω

—

T_peri

—

Radius

—

Inclination

—

Detection Method

Astrometry

Mass Meas. Method

Astrometry

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

alf CMa Bb

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

Lucas et al. (2022) excluded companions more massive than 20 M_Jup but not <1-2 M_Jup planets at 0.5-1.3 AUs through imaging. Astrometric analysis performed by Kiefer et al. (2024a) suggests that a source within 200-500 milliarcseconds (i.e 0.5-1.3 AUs) is inducing proper motion anomalies only partially induced by primary star Sirius A.

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Star

Name

Sirius B

Distance

2.65458 (\pm 0.00321)

pc 1 publication

The Revised TESS Input Catalog and Candidate Target List

Spectral type

DA1.9

Apparent magnitude V

8.5

Mass

1.018 (\pm 0.011)

M_Sun 1 publication

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry

Age

0.228 (\pm 0.01)

Gyr 1 publication

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry

Effective temperature

25000.0 (\pm 200.0)

K 1 publication

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry

Radius

0.0081 (\pm 0.6)

R_Sun 1 publication

The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry

Metallicity [Fe/H]

—

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

06:45:09.3

Dec₂₀₀₀

-16:43:00.7

Alternate Names

alf CMa B

Renowned white dwarf companion to bright star Sirius A (spT A1Va), around which it completes a long period (P = 50.1284 ± 0.0043 y), highly eccentric orbit (a = 19.85 AUs, e = 0.591 ± 0.00037).

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