Key parameters at a glance
- A radius of 6.09 Earth radii
- A mass of 30.83 Earth masses
- Surface gravity around 0.83 g
- An orbital period of 10.495 days
- Semi-major axis 0.0880 AU
- Distance from Earth 35.82 light-years
- Earth Similarity Index 0.422
- Travel time at Voyager 1 speed 631,635 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around HD 115404 A
HD 115404 A 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 |
|---|---|---|---|---|---|---|
| HD 115404 A b this | Neptune-like | 6.09 | 30.83 | 10.495 | — | 2022 |
| HD 115404 A c | Gas Giant | 12.50 | 3,279.67 | 15,319.225 | — | 2022 |
HD 115404 A b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#275of 574
top 47.7%
This planet
6.09R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 115404 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.09 | 11.21 |
| Mass (M⊕) | 1.00 | 30.83 | 317.83 |
| Density (g/cm³) | 5.51 | 0.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.83 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 30.829 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 115404 A
HIP
HIP 64797 A
TIC
TIC 373765355
Gaia DR2
Gaia DR2 3936909723803146368
Gaia DR3
Gaia DR3 3936909723803146368
System
HIP 64797 A
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.49 Earth days (2.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0880 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.422
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: HD 115404 A
Spectral Class
K-type orange
Effective Temperature
5,019 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.727 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.16
Extended Stellar Properties
Surface gravity (log g)
4.634 dex
Stellar density
3.045 g/cm³
Rotation period
19.00 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
91.033 mas
Total Proper Motion
688.892 mas/yr
PM Right Ascension
636.03 mas/yr
PM Declination
-264.64 mas/yr
Galactic Cartesian (pc)
x = -0.903 · y = -0.315 · z = 0.293
Equatorial (J2000)
RA 199.21558° · Dec 17.01604°
Galactic ℓ, b
334.410° · 78.303°
Ecliptic λ, β
190.802° · 23.184°
HTM-20 index
1316573270
Observation Record
Photometric series
1
Stellar spectra
1
Archive notes
1
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