Key parameters at a glance

A radius of 12.20 Earth radii
A mass of 5,085.28 Earth masses
Surface gravity around 34.17 g
Semi-major axis 2,880.0000 AU
Equilibrium temperature 2,270 K (1997 °C)
Distance from Earth 449.77 light-years
Earth Similarity Index 0.053
Travel time at Voyager 1 speed 7,931,736 years

USco1621 b Planet Profile

Physical Specs

Radius

12.20 R⊕

Radius (Jupiter)

1.090 R♃

Mass

5,085.28 M⊕

Mass (Jupiter)

16.000 M♃

Density

15.40 g/cm³

Surface Gravity

34.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.053

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Imaging

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕

Metric	Earth	USco1621 b	Jupiter
Radius (R⊕)	1.00	12.20	11.21
Mass (M⊕)	1.00	5,085.28	317.83
Density (g/cm³)	5.51	15.40	1.33
Surface Gravity (g)	1.00	34.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5,085.280 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 322928241

Gaia DR2

Gaia DR2 6048608906890968960

Gaia DR3

Gaia DR3 6048608906890968960

System

USco1621 A

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771

Mass 5,085.280 M⊕ · percentile 95 / cohort 1747

Distance 137.90 pc · percentile 42 / cohort 1759

ESI 0.053 · percentile 6 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

2,880.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

2,270K

(1997 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.053

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Chinchilla et al. 2020

Instrument

Multiple Instruments

Publication

2020-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Multiple Observatories (8 shown).

Gl 49 b · Sub-Neptune GJ 357 c · Super-Earth GJ 357 d · Sub-Neptune HR 5183 b · Gas Giant NSVS 14256825 b · Gas Giant 7 CMa c · Gas Giant HD 213885 c · Neptune-like USco1556 b · Gas Giant

Host System: USco1621 A

Spectral Class

M-type red dwarf

Effective Temperature

3,460 K — cooler than the Sun (5,778 K)

Estimated Age

0.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.710 R☉

Stellar Mass

0.360 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.254 dex

Stellar density

1.145 g/cm³

Rotation period

2.06 days

Distance

137.90 parsec

Light-years 449.77 ly

V-band magnitude

15.54 mag

Voyager-speed travel 7,931,736 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

7.223 mas

Total Proper Motion

26.342 mas/yr

PM Right Ascension

-6.14 mas/yr

PM Declination

-25.62 mas/yr

Galactic Cartesian (pc)

x = -0.376 · y = -0.821 · z = -0.430

Equatorial (J2000)

RA 245.37309° · Dec -25.49543°

Galactic ℓ, b

351.437° · 17.014°

Ecliptic λ, β

247.847° · -3.930°

HTM-20 index

970871285

Similar Worlds

ROXs 12 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 445.7 ly

HD 112300 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 202.5 ly

HD 220074 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 1,058.5 ly

FU Tau b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 435.4 ly

2MASS J03590986+2009361 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 383.0 ly

KOINTREAU-4 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 474.3 ly

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