Key parameters at a glance
- A radius of 13.90 Earth radii
- A mass of 283.82 Earth masses
- Surface gravity around 1.47 g
- An orbital period of 1,925.310 days
- Semi-major axis 2.3200 AU
- Distance from Earth 28.70 light-years
- Earth Similarity Index 0.298
- Travel time at Voyager 1 speed 506,188 years
1 sibling around GJ 849
GJ 849 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 |
|---|---|---|---|---|---|---|
| GJ 849 b this | Gas Giant | 13.90 | 283.82 | 1,925.310 | — | 2006 |
| GJ 849 c | Gas Giant | 13.80 | 314.65 | 5,990.000 | — | 2014 |
GJ 849 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#456of 1771
top 25.7%
This planet
13.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | GJ 849 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.90 | 11.21 |
| Mass (M⊕) | 1.00 | 283.82 | 317.83 |
| Density (g/cm³) | 5.51 | 0.58 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.47 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 283.821 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 109388
TIC
TIC 248027247
Gaia DR2
Gaia DR2 2627117287488522240
Gaia DR3
Gaia DR3 2627117287488522240
System
GJ 849
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 5.27 Earth years on a nearly circular orbit at a mean orbital distance of 2.3200 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
24.850 m/s
Transit mid-time (BJD)
2,453,906.0000
Long. of periastron (ω)
111.00°
Angular separation (arcsec)
264.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.298
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Butler et al. 2006Instrument
HIRES Spectrometer
Publication
2006-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2006 at W. M. Keck Observatory (7 shown).
Host System: GJ 849
Spectral Class
M-type red dwarf
Effective Temperature
3,467 K — cooler than the Sun (5,778 K)
Estimated Age
3.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.450 R☉
Stellar Mass
0.450 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.800 dex
Stellar density
6.514 g/cm³
Systemic radial velocity
-15.30 km/s
Rotational v·sin i
1.00 km/s
Rotation period
40.45 days
Activity index (log R'HK)
-5.116
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
113.600 mas
Total Proper Motion
1,132.746 mas/yr
PM Right Ascension
1,132.53 mas/yr
PM Declination
-22.13 mas/yr
Galactic Cartesian (pc)
x = 0.883 · y = -0.461 · z = -0.081
Equatorial (J2000)
RA 332.42299° · Dec -4.64083°
Galactic ℓ, b
55.894° · -45.403°
Ecliptic λ, β
332.720° · 6.276°
HTM-20 index
819204957
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
3
Similar Worlds
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GJ 849 c
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