UPSA Object Registry
Registry · exoplanet

51 Eri b

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
04h 37m 36.18s
Declination
−02° 28′ 25.8″
Galactic l, b
198.61, -30.66
Magnitude V
5.211
Distance
29.758 pc

Planet

NASA Exoplanet Archive, composite parameters
Host star51 Eri · F0 IV
DiscoveryImaging, 2015 · Gemini Observatory
Orbital period9,100 d
Semi-major axis10.4 au
Eccentricity0.57
Radius— R⊕
Mass3,464.3 M⊕ · 10.9 M♃
Density— g/cm³
Equilibrium temperature807 K
System distance29.758 pc

Published measurements

5 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

ValueUnitUncertainty Band / methodSourceReferenceYear
1,303.096 M_earth ± 127.1 Imaging NASA Exoplanet Archive Elliott et al. 2024 2024
3,464.33 M_earth Imaging NASA Exoplanet Archive Dupuy et al. 2022 2022
635.66 M_earth Imaging NASA Exoplanet Archive Macintosh et al. 2015 2015

Orbital period 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
9,100 d ± 1,100 Imaging NASA Exoplanet Archive Dupuy et al. 2022 2022
11,688 d ± 6,209 Imaging NASA Exoplanet Archive Maire et al. 2019 2019
14,965 d ± 1.278e+04 Imaging NASA Exoplanet Archive De Rosa et al. 2015 2015

Semi-major axis 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
10.4 au ± 0.8 Imaging NASA Exoplanet Archive Dupuy et al. 2022 2022
12 au ± 4 Imaging NASA Exoplanet Archive Maire et al. 2019 2019
14 au ± 7 Imaging NASA Exoplanet Archive De Rosa et al. 2015 2015
13.2 au ± 0.2 Imaging NASA Exoplanet Archive Macintosh et al. 2015 2015

Eccentricity 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.57 ± 0.08 Imaging NASA Exoplanet Archive Dupuy et al. 2022 2022
0.45 ± 0.1 Imaging NASA Exoplanet Archive Maire et al. 2019 2019
0.21 ± 0.19 Imaging NASA Exoplanet Archive De Rosa et al. 2015 2015

Equilibrium temperature 2 values

ValueUnitUncertainty Band / methodSourceReferenceYear
807 K ± 45 Imaging NASA Exoplanet Archive Elliott et al. 2024 2024
700 K Imaging NASA Exoplanet Archive Macintosh et al. 2015 2015

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
51 Eri Star 0″ —
* 51 Eri HighPM* 1.205″ 5.209
* 51 Eri b Planet 1.205″ —
UCAC2 30947523 Star 28.69″ 11.8
StKM 1-497 TTauri* 66.02″ 10.59
BD-02 961 Star 235.5″ 8.89
UCAC2 30947529 Variable* 259.1″ 12.42
Z 393-51 Seyfert2 532.6″ —

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/51-eri-b · Registry entry updated 2026-08-14.