Key parameters at a glance
- A radius of 2.11 Earth radii
- A mass of 5.10 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 4.215 days
- Semi-major axis 0.0502 AU
- Distance from Earth 27.73 light-years
- Earth Similarity Index 0.766
- Travel time at Voyager 1 speed 489,091 years
Context from the literature
61 Virginis b is an extrasolar planet, orbiting the 5th magnitude G-type star 61 Virginis, in Virgo. This planet has a minimum mass of 5.1 times that of Earth and is an example of a super-Earth planet. It orbits very close to the star, at a distance of 0.050201 AU with an eccentricity of 0.12. This planet was discovered on 14 December 2009 using the radial velocity method taken at Keck and Anglo-Australian Observatories.
Excerpted from Wikipedia · full article
2 siblings around 61 Vir
61 Vir b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
61 Vir b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1806of 1978
top 91.3%
This planet
2.11R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | 61 Vir b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.11 | 11.21 |
| Mass (M⊕) | 1.00 | 5.10 | 317.83 |
| Density (g/cm³) | 5.51 | 2.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 5.100 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 115617
HIP
HIP 64924
TIC
TIC 422478973
Gaia DR2
Gaia DR2 3507879565090229888
Gaia DR3
Gaia DR3 3507879565090229888
System
61 Vir
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.22 Earth days (1.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0502 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
2.120 m/s
Transit mid-time (BJD)
2,455,200.5970
Long. of periastron (ω)
105.00°
Angular separation (arcsec)
5.90000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.766
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Vogt et al. 2010Instrument
Multiple Instruments
Publication
2010-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at Multiple Observatories (3 shown).
Host System: 61 Vir
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,577 K — cooler than the Sun (5,778 K)
Estimated Age
8.96 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.963 R☉
Stellar Mass
0.942 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.340 dex
Stellar density
1.449 g/cm³
Systemic radial velocity
-8.20 km/s
Rotational v·sin i
1.90 km/s
Activity index (log R'HK)
-5.040
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
117.573 mas
Total Proper Motion
1,508.842 mas/yr
PM Right Ascension
-1,070.81 mas/yr
PM Declination
-1,063.00 mas/yr
Galactic Cartesian (pc)
x = -0.894 · y = -0.318 · z = -0.314
Equatorial (J2000)
RA 199.59646° · Dec -18.31577°
Galactic ℓ, b
311.852° · 44.089°
Ecliptic λ, β
205.001° · -9.304°
HTM-20 index
224855835
Observation Record
Photometric series
1
RV measurements
6
Stellar spectra
9
Similar Worlds
Kepler-518 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.11 R⊕ · 1,102.1 ly
Kepler-1484 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.11 R⊕ · 9,392.7 ly
Kepler-829 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.11 R⊕ · 3,502.1 ly
Kepler-794 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.11 R⊕ · 3,037.1 ly
HD 110113 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.11 R⊕ · 346.7 ly
Kepler-1828 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.12 R⊕ · 2,843.5 ly