61 Virginis · The Exoplanet Codex

Section 01

General Information

Spectral type

G5V

T_eff

~5577 K

log g

~4.39

[Fe/H]

−0.01 dex

Distance

8.52 pc

Planets

3

Type

Solar analogue

61 Virginis star field image — Image: STScI / DSS2 — 61 Virginis field

Science Context

61 Virginis is one of the best solar analogues known — G5V with [Fe/H] ≈ −0.01. Its three super-Earth/Neptune-class planets make it a key target for probing how near-solar chemistry translates to planet formation outcomes. A direct comparison to 55 Cnc A ([Fe/H] = +0.32) at the same spectral class tests the metallicity–planet mass function.

Stellar Parameters

Parameter	Symbol	Value	Source
Effective temperature	T_eff	~5577 K	Literature
Surface gravity	log g	~4.39	Literature
Metallicity	[Fe/H]	~−0.01 dex	Literature — nearly solar
Spectral type	—	G5V	Excellent solar analogue
Distance	d	8.52 pc (27.8 ly)	Gaia DR3

Known Planets

Planet	Mass	Type	Semi-major axis	Hab zone
61 Vir b	5.1 M⊕	Super-Earth	0.0502 AU	No — too hot
61 Vir c	18.2 M⊕	Neptune-class	0.2175 AU	No
61 Vir d	22.9 M⊕	Neptune-class	0.476 AU	No

Section 02

NASA Interactive Visualization

// SYSTEM SCAN — NASA EXOPLANET ARCHIVE //

Interactive: NASA Eyes on Exoplanets / JPL Open NASA page ↗

// INTERACTIVE SKY VIEW //

Section 04

Our Findings

Spectral analysis of 61 Virginis is queued for the Exoplanet Codex pipeline. EW measurements and elemental abundances will be published here upon completion. Follow our progress on the Mission Log.

Section 05

References & Credits

Key Literature

Vogt et al. (2010), ApJ 708, 1366 — three-planet discovery

Mayor et al. (2011) — planet confirmation

Data Sources

NASA/IPAC Exoplanet Archive

SIMBAD / CDS — stellar parameters

Hipparcos / Gaia — parallax & distance

Image Credits

Image: STScI / DSS2 — 61 Virginis field

Interactive sky: CDS Aladin Lite v3 / DSS2

NASA Eyes: NASA/JPL-Caltech

Pipeline

HARPS S1D — ESO Science Archive

Analysis: The Exoplanet Codex

github.com/damienabraxas/exoplanetcodex

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