Registry · exoplanet

61 Vir c

Exoplanet

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 13h 18m 23.15s
Declination: −18° 18′ 56.8″
Galactic l, b: 311.85, 44.09
Magnitude V: 4.696
Distance: 8.5033 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	61 Vir · G5 V
Discovery	Radial Velocity, 2009 · Multiple Observatories
Orbital period	38.021 d
Semi-major axis	0.2175 au
Eccentricity	0.14
Radius	4.46 R⊕ · 0.398 R♃
Mass	18.2 M⊕ · 0.057 M♃
Density	1.13 g/cm³
Equilibrium temperature	565.87 K
System distance	8.5033 pc

Published measurements

4 quantities measured more than once

One object can carry a dozen published estimates of the same quantity. The register keeps them side by side rather than picking a winner — the citation is part of the value.

Mass 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
17.84	M_earth	± 0.77	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
16.1139	M_earth	± 1.112	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
18.2	M_earth	± 1.1	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2010	2010

Orbital period 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
38.0864	d	± 0.0052	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
38.0957	d	± 0.0083	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
38.021	d	± 0.034	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2010	2010

Semi-major axis 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.2139	au	± 0.0031	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
0.2151	au	± 0.0028	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.2175	au	± 0.0001	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2010	2010

Eccentricity 3 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.022	± 0.024	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
0.068	± 0.067	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.14	± 0.06	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2010	2010

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
61 Vir	Star	0″	—
61 Vir b	Exoplanet	0″	4.696
61 Vir d	Exoplanet	0″	4.696
* 61 Vir c	Planet	23.39″	—
* 61 Vir	HighPM*	23.39″	4.74
* 61 Vir b	Planet	23.39″	—
* 61 Vir d	Planet	23.39″	—
HD 115559	**	216.6″	9.2
TYC 6116-386-1	Star	388.2″	10.65

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/61-vir-c · Registry entry updated 2026-08-14.