Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,639.99 Earth masses
- Surface gravity around 10.01 g
- An orbital period of 655.570 days
- Semi-major axis 1.3400 AU
- Distance from Earth 112.39 light-years
- Earth Similarity Index 0.433
- Travel time at Voyager 1 speed 1,982,074 years
Context from the literature
BD-17°63 b, formally named Finlay, is an exoplanet located approximately 112.5 light-years away in the constellation of Cetus, orbiting the 10th magnitude K-type main sequence star BD−17 63. This planet has a minimum mass of 5.1 MJ and orbits at a distance of 1.34 astronomical units from the star. The distance ranges from 0.62 AU to 2.06 AU, corresponding to the eccentricity of 0.54. One revolution takes about 656 days.
Excerpted from Wikipedia · full article
BD-17 63 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1063of 1771
top 60.0%
This planet
12.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | BD-17 63 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,639.99 | 317.83 |
| Density (g/cm³) | 5.51 | 4.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 10.01 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,639.995 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,620.925 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 2247
TIC
TIC 75377076
Gaia DR2
Gaia DR2 2367734656180397952
Gaia DR3
Gaia DR3 2367734656180397952
System
BD-17 63
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.79 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.3400 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.433
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
Moutou et al. 2009Instrument
HARPS Spectrograph
Publication
2009-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2008 at La Silla Observatory (12 shown).
Host System: BD-17 63
Spectral Class
K-type orange
Effective Temperature
4,714 K — cooler than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.740 R☉
Stellar Mass
0.741 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.260 dex
Stellar density
2.758 g/cm³
Systemic radial velocity
3.40 km/s
Rotational v·sin i
1.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
28.990 mas
Total Proper Motion
421.921 mas/yr
PM Right Ascension
-355.18 mas/yr
PM Declination
-227.74 mas/yr
Galactic Cartesian (pc)
x = 0.953 · y = 0.119 · z = -0.279
Equatorial (J2000)
RA 7.14135° · Dec -16.22733°
Galactic ℓ, b
95.830° · -77.878°
Ecliptic λ, β
359.897° · -17.690°
HTM-20 index
1260443740
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
1
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