Key parameters at a glance

A radius of 18.05 Earth radii
A mass of 247.91 Earth masses
Surface gravity around 0.76 g
An orbital period of 3.554 days
Semi-major axis 0.0508 AU
Equilibrium temperature 1,778 K (1505 °C)
Distance from Earth 1,682.90 light-years
Earth Similarity Index 0.043
Travel time at Voyager 1 speed 29,677,935 years

TrES-4 b Planet Profile

Physical Specs

Radius

18.05 R⊕

Radius (Jupiter)

1.610 R♃

Mass

247.91 M⊕

Mass (Jupiter)

0.780 M♃

Density

0.10 g/cm³

Surface Gravity

0.76 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.043

HZ Position Inner

Controversial No

Discovery

Year 2007

Method Transit

Facility TrES

Telescope 0.10 m Schmidt Telescope

Size rank in cohort

Rank by radius

#70of 1771

top 3.9%

This planet

18.05R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

NGTS-31 b 18.05 R⊕ OGLE2-TR-L9 b 18.05 R⊕ HAT-P-65 b 18.06 R⊕

Metric	Earth	TrES-4 b	Jupiter
Radius (R⊕)	1.00	18.05	11.21
Mass (M⊕)	1.00	247.91	317.83
Density (g/cm³)	5.51	0.10	1.33
Surface Gravity (g)	1.00	0.76	2.53
Insolation (S⊕)	1.00	2,276.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	247.907 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 159742538

Gaia DR2

Gaia DR2 4609062308806929152

Gaia DR3

Gaia DR3 4609062308806929152

System

TrES-4

Percentile among Gas Giant cohort

Radius 18.046 R⊕ · percentile 96 / cohort 1771

Mass 247.907 M⊕ · percentile 26 / cohort 1747

Orbital period 3.55 d · percentile 24 / cohort 1533

Distance 515.98 pc · percentile 75 / cohort 1759

ESI 0.043 · percentile 2 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.554 days

Semi-major axis

0.0508 AU

Eccentricity

0.000

Inclination

82.81 °

Year Length

A year here lasts approximately 3.55 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0508 AU.

Transit Fingerprint

Depth

0.980 %

Duration

3.634 h

Impact parameter b

0.755

Rp / R★

0.099650

Transit midpoint (BJD)

2,460,478.7129

Photometric dip

Transit produces a flux drop of 9,800 ppm lasting ≈ 3.63 h.

Extended Orbital Architecture

Planet / star radius ratio

0.099650

Semi-major axis / stellar radius

6.040

Impact parameter (b)

0.755

RV semi-amplitude (K)

97.400 m/s

Transit mid-time (BJD)

2,460,478.7129

Long. of periastron (ω)

80.60°

Sky-projected obliquity (λ)

6.30°

Angular separation (arcsec)

0.09850

Eq. Temperature

1,778K

(1505 °C)

Insolation (S⊕)

2,276.30

Earth = 1.00

Earth Similarity (ESI)

0.043

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

Mandushev et al. 2007

Instrument

2K CCD Sensor

Publication

2007-10

Observation locale

Ground

Host System: TrES-4

Spectral Class

F-type yellow-white

Effective Temperature

6,200 K — hotter than the Sun (5,778 K)

Estimated Age

2.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.660 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.060 dex

Stellar density

0.330 g/cm³

Systemic radial velocity

-16.10 km/s

Rotational v·sin i

8.50 km/s

Activity index (log R'HK)

-5.110

Metallicity ratio

[Fe/H]

Distance

515.98 parsec

Light-years 1,682.90 ly

V-band magnitude

11.93 mag

Voyager-speed travel 29,677,935 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

1.910 mas

Total Proper Motion

21.839 mas/yr

PM Right Ascension

-6.48 mas/yr

PM Declination

-20.86 mas/yr

Galactic Cartesian (pc)

x = -0.024 · y = -0.796 · z = 0.605

Equatorial (J2000)

RA 268.30434° · Dec 37.21174°

Galactic ℓ, b

63.039° · 26.994°

Ecliptic λ, β

267.242° · 60.635°

HTM-20 index

1935600135

Observation Record

Photometric series

RV measurements

Transmission spectra

Emission spectra

Archive notes