Key parameters at a glance
- A mass of 6.20 Earth masses
- An orbital period of 1.272 days
- Semi-major axis 0.0208 AU
- Equilibrium temperature 1,820 K (1547 °C)
- Distance from Earth 142.10 light-years
- Travel time at Voyager 1 speed 2,505,967 years
- Almost certainly tidally locked to its host star given the close orbit
BD+05 4868 A b Planet Profile
Physical Specs
Classification
Planet Type
Unclassified
Discovery
| Metric | Earth | BD+05 4868 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | — | 11.21 |
| Mass (M⊕) | 1.00 | 6.20 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | — | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 107587
TIC
TIC 466376085
Gaia DR2
Gaia DR2 2700378125204437760
Gaia DR3
Gaia DR3 2700378125204437760
System
BD+05 4868
Percentile among Unclassified cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.27 Earth days (0.3% of a terrestrial year) at a mean orbital distance of 0.0208 AU.
Transit Fingerprint
Depth
1.400 %
Transit midpoint (BJD)
2,460,556.2892
Photometric dip
Transit produces a flux drop of 14,000 ppm.
Extended Orbital Architecture
Semi-major axis / stellar radius
6.400
RV semi-amplitude (K)
4.500 m/s
Transit mid-time (BJD)
2,460,556.2892
Angular separation (arcsec)
0.47700
Eq. Temperature
1,820K
(1547 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
—
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Hon et al. 2025Instrument
TESS CCD Array
Publication
2025-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: BD+05 4868 A
Spectral Class
K-type orange
Effective Temperature
4,596 K — cooler than the Sun (5,778 K)
Estimated Age
11.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.690 R☉
Stellar Mass
0.700 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
2.994 g/cm³
Systemic radial velocity
-25.60 km/s
Rotational v·sin i
3.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
22.924 mas
Total Proper Motion
231.465 mas/yr
PM Right Ascension
205.46 mas/yr
PM Declination
106.60 mas/yr
Galactic Cartesian (pc)
x = 0.832 · y = -0.543 · z = 0.115
Equatorial (J2000)
RA 326.86140° · Dec 6.60532°
Galactic ℓ, b
63.202° · -34.174°
Ecliptic λ, β
331.451° · 18.756°
HTM-20 index
966514392
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