UPSA Object Registry
Registry · exoplanet

GJ 581 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
15h 19m 25.55s
Declination
−07° 43′ 21.7″
Galactic l, b
354.07, 40.02
Magnitude V
10.57
Distance
6.2981 pc

Planet

NASA Exoplanet Archive, composite parameters
Host starGJ 581 · M3.0 V
DiscoveryRadial Velocity, 2007 · La Silla Observatory
Orbital period12.9211 d
Semi-major axis0.0718 au
Eccentricity0.032
Radius2.5 R⊕ · 0.223 R♃
Mass6.81 M⊕ · 0.02143 M♃
Density2.39 g/cm³
Equilibrium temperature346.13 K
System distance6.2981 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 6 values

ValueUnitUncertainty Band / methodSourceReferenceYear
6.81 M_earth ± 0.21 Radial Velocity NASA Exoplanet Archive von Stauffenberg et al. 2024 2024
5.053472 M_earth ± 0.6992 Radial Velocity NASA Exoplanet Archive Rosenthal et al. 2021 2021
5.652 M_earth ± 0.386 Radial Velocity NASA Exoplanet Archive Trifonov et al. 2018 2018
5.5 M_earth ± 0.3 Radial Velocity NASA Exoplanet Archive Robertson et al. 2014 2014
5.6 M_earth ± 0.3 Radial Velocity NASA Exoplanet Archive Vogt et al. 2010 2010
5.36 M_earth Radial Velocity NASA Exoplanet Archive Mayor et al. 2009 2009

Orbital period 6 values

ValueUnitUncertainty Band / methodSourceReferenceYear
12.9211 d ± 0.0008 Radial Velocity NASA Exoplanet Archive von Stauffenberg et al. 2024 2024
12.9144 d ± 0.0045 Radial Velocity NASA Exoplanet Archive Rosenthal et al. 2021 2021
12.919 d ± 0.003 Radial Velocity NASA Exoplanet Archive Trifonov et al. 2018 2018
12.914 d ± 0.002 Radial Velocity NASA Exoplanet Archive Robertson et al. 2014 2014
12.9191 d ± 0.0058 Radial Velocity NASA Exoplanet Archive Vogt et al. 2010 2010
12.9292 d ± 0.0047 Radial Velocity NASA Exoplanet Archive Mayor et al. 2009 2009

Semi-major axis 6 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.0718 au ± 0.0008 Radial Velocity NASA Exoplanet Archive von Stauffenberg et al. 2024 2024
0.07359 au ± 0.00076 Radial Velocity NASA Exoplanet Archive Rosenthal et al. 2021 2021
0.074 au ± 0.001 Radial Velocity NASA Exoplanet Archive Trifonov et al. 2018 2018
0.0721 au ± 0.0003 Radial Velocity NASA Exoplanet Archive Robertson et al. 2014 2014
0.072993 au ± 2.20e-05 Radial Velocity NASA Exoplanet Archive Vogt et al. 2010 2010
0.07 au Radial Velocity NASA Exoplanet Archive Mayor et al. 2009 2009

Eccentricity 6 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.032 ± 0.027 Radial Velocity NASA Exoplanet Archive von Stauffenberg et al. 2024 2024
0.12 ± 0.12 Radial Velocity NASA Exoplanet Archive Rosenthal et al. 2021 2021
0.087 ± 0.15 Radial Velocity NASA Exoplanet Archive Trifonov et al. 2018 2018
0 ± 0.06 Radial Velocity NASA Exoplanet Archive Robertson et al. 2014 2014
0 Radial Velocity NASA Exoplanet Archive Vogt et al. 2010 2010
0.17 ± 0.07 Radial Velocity NASA Exoplanet Archive Mayor et al. 2009 2009

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
GJ 581 b Exoplanet 0″ 10.57
GJ 581 e Exoplanet 0″ 10.57
GJ 581 Star 0″ —
BD-07 4003d Planet 18.99″ —
BD-07 4003e Planet 18.99″ —
BD-07 4003g Planet Candidate 18.99″ —
BD-07 4003f Planet Candidate 18.99″ —
BD-07 4003 BYDraV* 18.99″ 10.56
BD-07 4003b Planet 18.99″ —
BD-07 4003c Planet 18.99″ —
LP 682-27 HighPM* 349.5″ 13.24

Provenance

where this card came from
ArchiveRead at (UTC)Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/gj-581-c · Registry entry updated 2026-08-14.