Key parameters at a glance
- A radius of 12.07 Earth radii
- A mass of 69.29 Earth masses
- Surface gravity around 0.48 g
- An orbital period of 5.457 days
- Semi-major axis 0.0635 AU
- Equilibrium temperature 1,445 K (1172 °C)
- Distance from Earth 1,218.76 light-years
- Earth Similarity Index 0.075
- Travel time at Voyager 1 speed 21,492,892 years
TOI-2587 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1489of 1771
top 84.0%
This planet
12.07R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2587 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.07 | 11.21 |
| Mass (M⊕) | 1.00 | 69.29 | 317.83 |
| Density (g/cm³) | 5.51 | 0.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.48 | 2.53 |
| Insolation (S⊕) | 1.00 | 728.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 69.287 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 68007716
Gaia DR2
Gaia DR2 3085216850017388672
Gaia DR3
Gaia DR3 3085216850017388672
System
TOI-2587
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.46 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0635 AU.
Transit Fingerprint
Depth
0.411 %
Duration
4.162 h
Impact parameter b
0.716
Transit midpoint (BJD)
2,458,950.0924
Photometric dip
Transit produces a flux drop of 4,110 ppm lasting ≈ 4.16 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
7.920
Impact parameter (b)
0.716
RV semi-amplitude (K)
22.700 m/s
Transit mid-time (BJD)
2,458,950.0924
Angular separation (arcsec)
0.17000
Eq. Temperature
1,445K
(1172 °C)
Insolation (S⊕)
728.00
Earth = 1.00
Earth Similarity (ESI)
0.075
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
Yee et al. 2023Instrument
TESS CCD Array
Publication
2023-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2587 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,760 K — cooler than the Sun (5,778 K)
Estimated Age
6.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.726 R☉
Stellar Mass
1.150 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.024 dex
Stellar density
0.316 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.648 mas
Total Proper Motion
33.561 mas/yr
PM Right Ascension
22.01 mas/yr
PM Declination
-25.33 mas/yr
Galactic Cartesian (pc)
x = -0.437 · y = 0.899 · z = -0.019
Equatorial (J2000)
RA 115.93171° · Dec -1.07333°
Galactic ℓ, b
219.944° · 11.112°
Ecliptic λ, β
118.135° · -22.015°
HTM-20 index
-1300949223
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