Key parameters at a glance
- A radius of 12.60 Earth radii
- A mass of 2,380.45 Earth masses
- Surface gravity around 14.99 g
- An orbital period of 116.688 days
- Semi-major axis 0.4810 AU
- Distance from Earth 58.39 light-years
- Earth Similarity Index 0.422
- Travel time at Voyager 1 speed 1,029,628 years
Context from the literature
70 Virginis b is an extrasolar planet approximately 60 light-years away in the constellation of Virgo. Announced in 1996 by Geoffrey Marcy and R. Paul Butler, 70 Virginis was one of the first stars confirmed to have planets orbiting it. When first announced, 70 Virginis b was considered to be within its star's habitable zone, but it was later confirmed that the planet has an eccentric orbit, closer to its parent.
Excerpted from Wikipedia · full article
70 Vir b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1179of 1771
top 66.5%
This planet
12.60R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | 70 Vir b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.60 | 11.21 |
| Mass (M⊕) | 1.00 | 2,380.45 | 317.83 |
| Density (g/cm³) | 5.51 | 6.54 | 1.33 |
| Surface Gravity (g) | 1.00 | 14.99 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,380.450 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,357.027 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 117176
HIP
HIP 65721
TIC
TIC 95473936
Gaia DR2
Gaia DR2 3740176925743650688
Gaia DR3
Gaia DR3 3740176925743994752
System
70 Vir
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 116.69 Earth days (31.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.4810 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
316.200 m/s
Transit mid-time (BJD)
2,455,656.6820
Long. of periastron (ω)
359.83°
Angular separation (arcsec)
26.90000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.422
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Marcy Butler 1996Instrument
Hamilton Echelle Spectrograph
Publication
1996-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 1996 at Lick Observatory (4 shown).
Host System: 70 Vir
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,495 K — cooler than the Sun (5,778 K)
Estimated Age
7.77 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.890 R☉
Stellar Mass
1.090 M☉
Metallicity [Fe/H]
-0.09
Extended Stellar Properties
Surface gravity (log g)
3.950 dex
Stellar density
0.190 g/cm³
Systemic radial velocity
4.95 km/s
Rotational v·sin i
1.56 km/s
Activity index (log R'HK)
-4.990
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
55.835 mas
Total Proper Motion
622.569 mas/yr
PM Right Ascension
-235.56 mas/yr
PM Declination
-576.28 mas/yr
Galactic Cartesian (pc)
x = -0.900 · y = -0.366 · z = 0.238
Equatorial (J2000)
RA 202.10649° · Dec 13.77631°
Galactic ℓ, b
337.657° · 74.099°
Ecliptic λ, β
194.967° · 21.338°
HTM-20 index
480059084
Observation Record
Photometric series
1
RV measurements
5
Stellar spectra
2
Archive notes
1
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