Key parameters at a glance
- A radius of 12.20 Earth radii
- A mass of 5,403.08 Earth masses
- Surface gravity around 36.30 g
- An orbital period of 18,600.000 days
- Semi-major axis 15.8000 AU
- Distance from Earth 130.71 light-years
- Earth Similarity Index 0.312
- Travel time at Voyager 1 speed 2,305,104 years
HIP 99770 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1410of 1771
top 79.6%
This planet
12.20R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HIP 99770 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.20 | 11.21 |
| Mass (M⊕) | 1.00 | 5,403.08 | 317.83 |
| Density (g/cm³) | 5.51 | 16.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 36.30 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5,403.083 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 99770
TIC
TIC 10988057
Gaia DR2
Gaia DR2 2060523518197844608
Gaia DR3
Gaia DR3 2060523518197844608
System
HIP 99770
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 50.92 Earth years on a highly eccentric trajectory at a mean orbital distance of 15.8000 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.312
0 = alien, 1 = Earth-identical
Detection Signatures
Astrometry
Positional wobble of the host star was measured.
Direct imaging
The planet has been imaged directly (rare).
Discovery Paper
Primary reference
Currie et al. 2022Instrument
Multiple Instruments
Publication
2022-11
Observation locale
Multiple Locales
Discovery cohort
Planets confirmed in 2023 at Multiple Observatories (12 shown).
Host System: HIP 99770
Spectral Class
A-type white
Effective Temperature
8,000 K — hotter than the Sun (5,778 K)
Estimated Age
0.26 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.940 R☉
Stellar Mass
1.900 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.141 dex
Stellar density
0.367 g/cm³
Rotational v·sin i
65.00 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
24.926 mas
Total Proper Motion
98.183 mas/yr
PM Right Ascension
68.39 mas/yr
PM Declination
70.45 mas/yr
Galactic Cartesian (pc)
x = 0.443 · y = -0.667 · z = 0.599
Equatorial (J2000)
RA 303.63383° · Dec 36.80660°
Galactic ℓ, b
74.449° · 1.171°
Ecliptic λ, β
319.906° · 54.572°
HTM-20 index
840815633
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