Key parameters at a glance

A radius of 9.98 Earth radii
A mass of 257.43 Earth masses
Surface gravity around 2.59 g
An orbital period of 3.914 days
Semi-major axis 0.0464 AU
Distance from Earth 2,522.52 light-years
Earth Similarity Index 0.404
Travel time at Voyager 1 speed 44,484,635 years
Almost certainly tidally locked to its host star given the close orbit

Lupus-TR-3 b Planet Profile

Physical Specs

Radius

9.98 R⊕

Radius (Jupiter)

0.890 R♃

Mass

257.43 M⊕

Mass (Jupiter)

0.810 M♃

Density

1.40 g/cm³

Surface Gravity

2.59 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.404

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Transit

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#4of 574

top 0.5%

This planet

9.98R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-2328 b 9.98 R⊕ WASP-130 b 9.98 R⊕ Kepler-424 b 9.98 R⊕

Metric	Earth	Lupus-TR-3 b	Jupiter
Radius (R⊕)	1.00	9.98	11.21
Mass (M⊕)	1.00	257.43	317.83
Density (g/cm³)	5.51	1.40	1.33
Surface Gravity (g)	1.00	2.59	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	257.431 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 153091721

Gaia DR2

Gaia DR2 6002207725193479552

Gaia DR3

Gaia DR3 6002207725193479552

System

Lupus-TR-3

Percentile among Neptune-like cohort

Radius 9.976 R⊕ · percentile 99 / cohort 574

Mass 257.431 M⊕ · percentile 95 / cohort 574

Orbital period 3.91 d · percentile 11 / cohort 524

Distance 773.41 pc · percentile 66 / cohort 572

ESI 0.404 · percentile 74 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

3.914 days

Semi-major axis

0.0464 AU

Eccentricity

0.000

Inclination

88.30 °

Year Length

A year here lasts approximately 3.91 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0464 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.404

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Weldrake et al. 2008

Instrument

Multiple Instruments

Publication

2008-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at Multiple Observatories (2 shown).

V0391 Peg b · Gas Giant 55 Cnc f · Neptune-like

Host System: Lupus-TR-3

Spectral Class

K-type orange

Effective Temperature

5,000 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.820 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

—

Distance

773.41 parsec

Light-years 2,522.52 ly

V-band magnitude

19.62 mag

Voyager-speed travel 44,484,635 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

1.370 mas

Total Proper Motion

17.383 mas/yr

PM Right Ascension

-14.22 mas/yr

PM Declination

-10.00 mas/yr

Galactic Cartesian (pc)

x = -0.445 · y = -0.581 · z = -0.682

Equatorial (J2000)

RA 232.57747° · Dec -42.97995°

Galactic ℓ, b

331.367° · 10.951°

Ecliptic λ, β

241.063° · -23.227°

HTM-20 index

-547266078

Similar Worlds

HATS-75 b

Neptune-like · K-type orange

Radius 9.91 R⊕ · 635.9 ly

TOI-5300 b

Neptune-like · K-type orange

Radius 9.86 R⊕ · 530.0 ly

TOI-5218 b

Neptune-like · K-type orange

Radius 9.86 R⊕ · 1,231.2 ly

Kepler-56 c

Neptune-like · K-type orange

Radius 9.80 R⊕ · 2,977.8 ly

TOI-5573 b

Neptune-like · K-type orange

Radius 9.75 R⊕ · 608.5 ly

HAT-P-20 b

Neptune-like · K-type orange

Radius 9.72 R⊕ · 231.7 ly

Explore Related Categories

Neptune-like Planets Transit Discoveries Multiple Observatories Mission K-type orange Hosts