Key parameters at a glance

A radius of 4.13 Earth radii
A mass of 27.00 Earth masses
Surface gravity around 1.58 g
An orbital period of 3.316 days
Semi-major axis 0.0417 AU
Equilibrium temperature 975 K (702 °C)
Distance from Earth 448.70 light-years
Earth Similarity Index 0.225
Travel time at Voyager 1 speed 7,912,812 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around TOI-1272

TOI-1272 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-1272 b this	Neptune-like	4.13	27.00	3.316	975	2022
TOI-1272 c	Neptune-like	4.95	21.70	8.681	697	2022

TOI-1272 b Planet Profile

Physical Specs

Radius

4.13 R⊕

Radius (Jupiter)

0.369 R♃

Mass

27.00 M⊕

Mass (Jupiter)

0.085 M♃

Density

2.09 g/cm³

Surface Gravity

1.58 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.225

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

#536of 574

top 93.2%

This planet

4.13R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-966 b 4.13 R⊕ HD 28109 c 4.13 R⊕ Kepler-697 b 4.13 R⊕

Metric	Earth	TOI-1272 b	Jupiter
Radius (R⊕)	1.00	4.13	11.21
Mass (M⊕)	1.00	27.00	317.83
Density (g/cm³)	5.51	2.09	1.33
Surface Gravity (g)	1.00	1.58	2.53
Insolation (S⊕)	1.00	120.60	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	27.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 417948359

Gaia DR2

Gaia DR2 1556242405699527424

Gaia DR3

Gaia DR3 1556242405699527424

System

TOI-1272

Percentile among Neptune-like cohort

Radius 4.132 R⊕ · percentile 7 / cohort 574

Mass 27.000 M⊕ · percentile 45 / cohort 574

Orbital period 3.32 d · percentile 6 / cohort 524

Distance 137.57 pc · percentile 31 / cohort 572

ESI 0.225 · percentile 34 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

3.316 days

Semi-major axis

0.0417 AU

Eccentricity

0.350

Inclination

— °

Year Length

A year here lasts approximately 3.32 Earth days (0.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0417 AU.

Transit Fingerprint

Depth

0.277 %

Duration

1.571 h

Impact parameter b

0.500

Rp / R★

0.047747

Transit midpoint (BJD)

2,458,713.0255

Photometric dip

Transit produces a flux drop of 2,770 ppm lasting ≈ 1.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.047747

Impact parameter (b)

0.500

RV semi-amplitude (K)

13.500 m/s

Transit mid-time (BJD)

2,458,713.0255

Long. of periastron (ω)

141.00°

Angular separation (arcsec)

0.30300

Eq. Temperature

975K

(702 °C)

Insolation (S⊕)

120.60

Earth = 1.00

Earth Similarity (ESI)

0.225

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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

Macdougall et al. 2022

Instrument

TESS CCD Array

Publication

2022-06

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-1272

Spectral Class

K-type orange

Effective Temperature

5,065 K — cooler than the Sun (5,778 K)

Estimated Age

1.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.793 R☉

Stellar Mass

0.877 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.582 dex

Stellar density

2.465 g/cm³

Rotation period

28.30 days

Activity index (log R'HK)

-4.705

Metallicity ratio

[Fe/H]

Distance

137.57 parsec

Light-years 448.70 ly

V-band magnitude

11.76 mag

Voyager-speed travel 7,912,812 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.240 mas

Total Proper Motion

63.472 mas/yr

PM Right Ascension

-63.30 mas/yr

PM Declination

4.66 mas/yr

Galactic Cartesian (pc)

x = -0.609 · y = -0.212 · z = 0.764

Equatorial (J2000)

RA 199.19620° · Dec 49.86106°

Galactic ℓ, b

112.547° · 66.753°

Ecliptic λ, β

169.789° · 51.787°

HTM-20 index

607632516

Similar Worlds

HD 77338 b

Neptune-like · K-type orange

Radius 4.12 R⊕ · 149.8 ly

Kepler-1993 b

Neptune-like · K-type orange

Radius 4.15 R⊕ · 3,365.6 ly

Kepler-815 b

Neptune-like · K-type orange

Radius 4.11 R⊕ · 4,107.2 ly

Kepler-247 c

Neptune-like · K-type orange

Radius 4.09 R⊕ · 2,164.7 ly

KMT-2023-BLG-1896L b

Neptune-like · K-type orange

Radius 4.19 R⊕ · 17,906.0 ly

Kepler-248 c

Neptune-like · K-type orange

Radius 4.07 R⊕ · 2,409.6 ly

Explore Related Categories

Neptune-like Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission K-type orange Hosts