Key parameters at a glance

A radius of 4.97 Earth radii
A mass of 44.10 Earth masses
Surface gravity around 1.79 g
An orbital period of 2.700 days
Semi-major axis 0.0374 AU
Equilibrium temperature 1,203 K (930 °C)
Distance from Earth 374.64 light-years
Earth Similarity Index 0.170
Travel time at Voyager 1 speed 6,606,760 years

1 sibling around TOI-1288

TOI-1288 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-1288 b this	Neptune-like	4.97	44.10	2.700	1,203	2022
TOI-1288 c	Gas Giant	11.10	85.70	416.000	—	2022

TOI-1288 b Planet Profile

Physical Specs

Radius

4.97 R⊕

Radius (Jupiter)

0.443 R♃

Mass

44.10 M⊕

Mass (Jupiter)

0.139 M♃

Density

1.97 g/cm³

Surface Gravity

1.79 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.170

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#385of 574

top 66.9%

This planet

4.97R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

NGTS-14 A b 4.98 R⊕ TOI-1272 c 4.95 R⊕ TOI-880 c 4.95 R⊕

Metric	Earth	TOI-1288 b	Jupiter
Radius (R⊕)	1.00	4.97	11.21
Mass (M⊕)	1.00	44.10	317.83
Density (g/cm³)	5.51	1.97	1.33
Surface Gravity (g)	1.00	1.79	2.53
Insolation (S⊕)	1.00	1,198.41	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	44.100 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 365733349

Gaia DR2

Gaia DR2 2245652826430109184

Gaia DR3

Gaia DR3 2245652826430109184

System

TOI-1288

Percentile among Neptune-like cohort

Radius 4.968 R⊕ · percentile 33 / cohort 574

Mass 44.100 M⊕ · percentile 66 / cohort 574

Orbital period 2.70 d · percentile 3 / cohort 524

Distance 114.87 pc · percentile 26 / cohort 572

ESI 0.170 · percentile 20 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

2.700 days

Semi-major axis

0.0374 AU

Eccentricity

0.000

Inclination

89.50 °

Year Length

A year here lasts approximately 2.70 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0374 AU.

Transit Fingerprint

Depth

0.280 %

Duration

2.379 h

Impact parameter b

0.291

Rp / R★

0.047534

Transit midpoint (BJD)

2,458,712.3588

Photometric dip

Transit produces a flux drop of 2,798 ppm lasting ≈ 2.38 h.

Extended Orbital Architecture

Planet / star radius ratio

0.047534

Semi-major axis / stellar radius

8.500

Impact parameter (b)

0.291

RV semi-amplitude (K)

20.890 m/s

Transit mid-time (BJD)

2,458,712.3588

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.32600

Eq. Temperature

1,203K

(930 °C)

Insolation (S⊕)

1,198.41

Earth = 1.00

Earth Similarity (ESI)

0.170

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Magliano et al. 2022

Instrument

TESS CCD Array

Publication

2022-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth TOI-2081 b · Sub-Neptune GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth HD 73583 c · Sub-Neptune TOI-1759 b · Sub-Neptune

Host System: TOI-1288

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,388 K — cooler than the Sun (5,778 K)

Estimated Age

6.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.958 R☉

Stellar Mass

0.955 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

4.453 dex

Stellar density

1.517 g/cm³

Systemic radial velocity

-68.10 km/s

Metallicity ratio

[Fe/H]

Distance

114.87 parsec

Light-years 374.64 ly

V-band magnitude

10.45 mag

Voyager-speed travel 6,606,760 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.677 mas

Total Proper Motion

81.109 mas/yr

PM Right Ascension

43.25 mas/yr

PM Declination

-68.61 mas/yr

Galactic Cartesian (pc)

x = 0.283 · y = -0.301 · z = 0.911

Equatorial (J2000)

RA 313.16703° · Dec 65.60878°

Galactic ℓ, b

101.443° · 13.286°

Ecliptic λ, β

16.913° · 72.825°

HTM-20 index

632623802