Key parameters at a glance
- A radius of 4.46 Earth radii
- A mass of 18.20 Earth masses
- Surface gravity around 0.91 g
- An orbital period of 38.021 days
- Semi-major axis 0.2175 AU
- Distance from Earth 27.73 light-years
- Earth Similarity Index 0.511
- Travel time at Voyager 1 speed 489,091 years
Context from the literature
61 Virginis c is an exoplanet orbiting the 5th apparent-magnitude G-type main-sequence star 61 Virginis in the constellation Virgo. 61 Virginis c has a minimum mass of 18.2 times that of Earth and orbits one-fifth the distance to the star as Earth orbits the Sun, at a precise distance of 0.2175 AU with an eccentricity of 0.14. This planet would most likely be a gas giant like Uranus and Neptune. This planet was discovered on 14 December 2009 from using a precise radial velocity method taken at Keck and Anglo-Australian Observatories.
Excerpted from Wikipedia · full article
2 siblings around 61 Vir
61 Vir c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
61 Vir c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#464of 574
top 80.7%
This planet
4.46R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | 61 Vir c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.46 | 11.21 |
| Mass (M⊕) | 1.00 | 18.20 | 317.83 |
| Density (g/cm³) | 5.51 | 1.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.91 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 18.200 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 Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 38.02 Earth days (10.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2175 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
3.620 m/s
Transit mid-time (BJD)
2,455,036.2400
Long. of periastron (ω)
341.00°
Angular separation (arcsec)
25.60000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.511
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-33 f
Neptune-like · G-type yellow (Sun-like)
Radius 4.46 R⊕ · 3,943.7 ly
Kepler-636 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.45 R⊕ · 1,012.1 ly
Kepler-1730 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.49 R⊕ · 4,654.5 ly
HD 90156 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.43 R⊕ · 71.6 ly
Kepler-550 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.42 R⊕ · 1,735.0 ly
HD 64114 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.41 R⊕ · 102.8 ly