Key parameters at a glance

A radius of 12.10 Earth radii
A mass of 6,674.40 Earth masses
Surface gravity around 45.59 g
Semi-major axis 3,319.0000 AU
Equilibrium temperature 2,507 K (2234 °C)
Distance from Earth 492.05 light-years
Earth Similarity Index 0.043
Travel time at Voyager 1 speed 8,677,221 years

HIP 77900 b Planet Profile

Physical Specs

Radius

12.10 R⊕

Radius (Jupiter)

1.080 R♃

Mass

6,674.40 M⊕

Mass (Jupiter)

21.000 M♃

Density

20.70 g/cm³

Surface Gravity

45.59 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.043

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Imaging

Facility European Space Agency (ESA) Gaia Satellite

Telescope 1.45 m x 0.5 m Telescope

Size rank in cohort

Rank by radius

#1454of 1771

top 82.0%

This planet

12.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 62364 b 12.10 R⊕ HD 106515 A b 12.10 R⊕ BD+20 2457 b 12.10 R⊕

Metric	Earth	HIP 77900 b	Jupiter
Radius (R⊕)	1.00	12.10	11.21
Mass (M⊕)	1.00	6,674.40	317.83
Density (g/cm³)	5.51	20.70	1.33
Surface Gravity (g)	1.00	45.59	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6,674.397 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 77900

TIC

TIC 24133681

Gaia DR2

Gaia DR2 6233740654686482560

Gaia DR3

Gaia DR3 6233740654686482560

System

HIP 77900

Percentile among Gas Giant cohort

Radius 12.100 R⊕ · percentile 16 / cohort 1771

Mass 6,674.397 M⊕ · percentile 97 / cohort 1747

Distance 150.86 pc · percentile 44 / cohort 1759

ESI 0.043 · percentile 2 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

3,319.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

2,507K

(2234 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.043

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Michel & Mugrauer 2024

Instrument

Gaia CCD array

Publication

2024-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at European Space Agency (ESA) Gaia Satellite (7 shown).

Gaia22dkvL b · Gas Giant 2MASS J21252752-8138278 b · Gas Giant G 196-3 b · Gas Giant 2MASS J03590986+2009361 b · Gas Giant 2MASS J11550485-7919108 b · Gas Giant ITG 15 b · Gas Giant 2MASS J11011926-7732383 b · Gas Giant

Host System: HIP 77900

Spectral Class

B-type blue-white

Effective Temperature

13,646 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

—

Stellar Mass

—

Metallicity [Fe/H]

—

Distance

150.86 parsec

Light-years 492.05 ly

V-band magnitude

6.15 mag

Voyager-speed travel 8,677,221 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.604 mas

Total Proper Motion

28.585 mas/yr

PM Right Ascension

-13.36 mas/yr

PM Declination

-25.27 mas/yr

Galactic Cartesian (pc)

x = -0.462 · y = -0.758 · z = -0.459

Equatorial (J2000)

RA 238.62539° · Dec -27.33874°

Galactic ℓ, b

345.568° · 20.004°

Ecliptic λ, β

242.232° · -6.873°

HTM-20 index

-902075453

Similar Worlds

HIP 79098 AB b

Gas Giant · B-type blue-white

Radius 12.10 R⊕ · 475.5 ly

HIP 78530 b

Gas Giant · B-type blue-white

Radius 12.00 R⊕ · 446.0 ly

kap And b

Gas Giant · B-type blue-white

Radius 12.30 R⊕ · 163.1 ly

mu2 Sco b

Gas Giant · B-type blue-white

Radius 12.30 R⊕ · —

b Cen AB b

Gas Giant · B-type blue-white

Radius 12.40 R⊕ · 319.9 ly

DP Leo b

Gas Giant · B-type blue-white

Radius 12.70 R⊕ · 997.0 ly

Explore Related Categories

Gas Giant Planets Imaging Discoveries European Space Agency (ESA) Gaia Satellite Mission B-type blue-white Hosts