Key parameters at a glance

A radius of 3.09 Earth radii
A mass of 48.80 Earth masses
Surface gravity around 5.11 g
An orbital period of 2.500 days
Semi-major axis 0.0229 AU
Equilibrium temperature 489 K (216 °C)
Distance from Earth 211.73 light-years
Earth Similarity Index 0.467
Travel time at Voyager 1 speed 3,733,882 years
Almost certainly tidally locked to its host star given the close orbit

TOI-1696 b Planet Profile

Physical Specs

Radius

3.09 R⊕

Radius (Jupiter)

0.276 R♃

Mass

48.80 M⊕

Mass (Jupiter)

0.154 M♃

Density

9.44 g/cm³

Surface Gravity

5.11 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.467

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

#443of 1978

top 22.3%

This planet

3.09R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-859 b 3.09 R⊕ Kepler-563 b 3.09 R⊕ Kepler-1734 b 3.09 R⊕

Metric	Earth	TOI-1696 b	Jupiter
Radius (R⊕)	1.00	3.09	11.21
Mass (M⊕)	1.00	48.80	317.83
Density (g/cm³)	5.51	9.44	1.33
Surface Gravity (g)	1.00	5.11	2.53
Insolation (S⊕)	1.00	13.50	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	48.800 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 470381900

Gaia DR2

Gaia DR2 270260649602149760

Gaia DR3

Gaia DR3 270260649602149760

System

TOI-1696

Percentile among Sub-Neptune cohort

Radius 3.090 R⊕ · percentile 78 / cohort 1978

Mass 48.800 M⊕ · percentile 98 / cohort 1978

Orbital period 2.50 d · percentile 3 / cohort 1946

Distance 64.92 pc · percentile 15 / cohort 1975

ESI 0.467 · percentile 65 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

2.500 days

Semi-major axis

0.0229 AU

Eccentricity

0.000

Inclination

88.46 °

Year Length

A year here lasts approximately 2.50 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0229 AU.

Transit Fingerprint

Depth

1.258 %

Duration

1.000 h

Impact parameter b

0.590

Rp / R★

0.102500

Transit midpoint (BJD)

2,458,834.2012

Photometric dip

Transit produces a flux drop of 12,579 ppm lasting ≈ 1.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.102500

Semi-major axis / stellar radius

17.700

Impact parameter (b)

0.590

RV semi-amplitude (K)

63.100 m/s

Transit mid-time (BJD)

2,458,834.2012

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.35300

Eq. Temperature

489K

(216 °C)

Insolation (S⊕)

13.50

Earth = 1.00

Earth Similarity (ESI)

0.467

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.

Discovery Paper

Primary reference

Beard et al. 2022

Instrument

TESS CCD Array

Publication

2022-04

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-1696

Spectral Class

M-type red dwarf

Effective Temperature

3,185 K — cooler than the Sun (5,778 K)

Estimated Age

7.10 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.278 R☉

Stellar Mass

0.255 M☉

Metallicity [Fe/H]

0.34

Extended Stellar Properties

Surface gravity (log g)

4.959 dex

Stellar density

16.800 g/cm³

Systemic radial velocity

-4.10 km/s

Rotational v·sin i

2.00 km/s

Metallicity ratio

[Fe/H]

Distance

64.92 parsec

Light-years 211.73 ly

V-band magnitude

16.82 mag

Voyager-speed travel 3,733,882 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.376 mas

Total Proper Motion

23.130 mas/yr

PM Right Ascension

12.93 mas/yr

PM Declination

-19.18 mas/yr

Galactic Cartesian (pc)

x = 0.275 · y = 0.598 · z = 0.753

Equatorial (J2000)

RA 65.28065° · Dec 48.81983°

Galactic ℓ, b

154.390° · -0.812°

Ecliptic λ, β

72.010° · 26.912°

HTM-20 index

-1823952030