UPSA Object Registry
Registry · exoplanet

XO-2 S 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
07h 48m 07.43s
Declination
+50° 13′ 00.9″
Galactic l, b
168.3, 29.33
Magnitude V
11.2
Distance
151.4 pc

Planet

NASA Exoplanet Archive, composite parameters
Host starXO-2 S · G8 V
DiscoveryRadial Velocity, 2014 · Roque de los Muchachos Observatory
Orbital period18.22 d
Semi-major axis0.1347 au
Eccentricity0.15
Radius10.9 R⊕ · 0.971 R♃
Mass82.635 M⊕ · 0.26 M♃
Density0.351 g/cm³
Equilibrium temperature706.59 K
System distance151.4 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

ValueUnitUncertainty Band / methodSourceReferenceYear
82.63539 M_earth ± 3.178 Radial Velocity NASA Exoplanet Archive Ruggieri et al. 2024 2024
82.6358 M_earth ± 12.71 Radial Velocity NASA Exoplanet Archive Stassun et al. 2017 2017
82.315 M_earth ± 4.449 Radial Velocity NASA Exoplanet Archive Desidera et al. 2014 2014

Orbital period 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
18.22 d ± 0.001 Radial Velocity NASA Exoplanet Archive Ruggieri et al. 2024 2024
18.157 d ± 0.034 Radial Velocity NASA Exoplanet Archive Stassun et al. 2017 2017
18.157 d ± 0.034 Radial Velocity NASA Exoplanet Archive Desidera et al. 2014 2014

Semi-major axis 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.1347 au ± 0.0025 Radial Velocity NASA Exoplanet Archive Ruggieri et al. 2024 2024
0.13 au ± 0 Radial Velocity NASA Exoplanet Archive Stassun et al. 2017 2017
0.1344 au ± 0.0025 Radial Velocity NASA Exoplanet Archive Desidera et al. 2014 2014

Eccentricity 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.15 ± 0.02 Radial Velocity NASA Exoplanet Archive Ruggieri et al. 2024 2024
0.18 ± 0.04 Radial Velocity NASA Exoplanet Archive Stassun et al. 2017 2017
0.18 ± 0.035 Radial Velocity NASA Exoplanet Archive Desidera et al. 2014 2014

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
XO-2 S c Exoplanet 0″ 11.2
XO-2 S d Exoplanet 0″ 11.2
XO-2 S Star 0″ —
BD+50 1471Bb Planet 2.434″ —
BD+50 1471Bc Planet 2.434″ —
BD+50 1471B HighPM* 2.434″ 11.09
XO-2 N Star 31.21″ —
XO-2 N b Exoplanet 31.21″ 11.25
BD+50 1471 HighPM* 33.36″ 11.14
BD+50 1471b Planet 33.36″ —
HD 233451 Star 145.5″ 10.19

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/xo-2-s-b · Registry entry updated 2026-08-14.