Key parameters at a glance
- A radius of 12.90 Earth radii
- A mass of 1,430.23 Earth masses
- Surface gravity around 8.59 g
- An orbital period of 3,649.000 days
- Semi-major axis 3.9900 AU
- Distance from Earth 78.46 light-years
- Earth Similarity Index 0.424
- Travel time at Voyager 1 speed 1,383,713 years
Context from the literature
HIP 70849 b is an extrasolar planet which orbits the K-type main sequence star HIP 70849, located approximately 79 light years away in the constellation Lupus. This planet was detected by HARPS and announced on October 19, 2009, together with 31 other planets. Its parameters were initially poorly constrained, estimated to have a minimum mass of 3-15 MJ and take anywhere from 5-90 years to orbit the star at a semimajor axis of 4.5-36 AU, with the eccentricity and inclination being unknown. This was significantly updated in a December 2022 paper, which found much better constrained parameters including a high eccentricity, and in a January 2023 paper which determined the planet's inclination and true mass via astrometry.
Excerpted from Wikipedia · full article
HIP 70849 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1011of 1771
top 57.0%
This planet
12.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HIP 70849 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.90 | 11.21 |
| Mass (M⊕) | 1.00 | 1,430.23 | 317.83 |
| Density (g/cm³) | 5.51 | 3.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 8.59 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,430.228 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,860.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 70849
TIC
TIC 127382459
Gaia DR2
Gaia DR2 6099000589942631424
Gaia DR3
Gaia DR3 6099000589942631424
System
HIP 70849
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 9.99 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.9900 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.424
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Segransan et al. 2011Instrument
HARPS Spectrograph
Publication
2011-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at La Silla Observatory (12 shown).
Host System: HIP 70849
Spectral Class
K-type orange
Effective Temperature
4,105 K — cooler than the Sun (5,778 K)
Estimated Age
3.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.633 R☉
Stellar Mass
0.650 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.624 dex
Stellar density
3.413 g/cm³
Systemic radial velocity
-0.03 km/s
Rotational v·sin i
0.30 km/s
Activity index (log R'HK)
-4.480
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
41.539 mas
Total Proper Motion
206.498 mas/yr
PM Right Ascension
-43.98 mas/yr
PM Declination
-201.76 mas/yr
Galactic Cartesian (pc)
x = -0.548 · y = -0.418 · z = -0.725
Equatorial (J2000)
RA 217.32708° · Dec -46.46468°
Galactic ℓ, b
319.967° · 13.144°
Ecliptic λ, β
230.796° · -29.933°
HTM-20 index
-1904419595
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