Registry · exoplanet

XO-2 S 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: 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 star	XO-2 S · G8 V
Discovery	Radial Velocity, 2014 · Roque de los Muchachos Observatory
Orbital period	120.059 d
Semi-major axis	0.4737 au
Eccentricity	0.149
Radius	13.6 R⊕ · 1.21 R♃
Mass	438.6 M⊕ · 1.38 M♃
Density	0.958 g/cm³
Equilibrium temperature	376.79 K
System distance	151.4 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 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
438.6032	M_earth	± 15.89	Radial Velocity	NASA Exoplanet Archive	Ruggieri et al. 2024	2024
435.409	M_earth	± 16.84	Radial Velocity	NASA Exoplanet Archive	Desidera et al. 2014	2014

Orbital period 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
120.059	d	± 0.013	Radial Velocity	NASA Exoplanet Archive	Ruggieri et al. 2024	2024
120.8	d	± 0.34	Radial Velocity	NASA Exoplanet Archive	Desidera et al. 2014	2014

Semi-major axis 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.4737	au	± 0.0085	Radial Velocity	NASA Exoplanet Archive	Ruggieri et al. 2024	2024
0.4756	au	± 0.0087	Radial Velocity	NASA Exoplanet Archive	Desidera et al. 2014	2014

Eccentricity 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.149		± 0.006	Radial Velocity	NASA Exoplanet Archive	Ruggieri et al. 2024	2024
0.1528		± 0.0094	Radial Velocity	NASA Exoplanet Archive	Desidera et al. 2014	2014

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
XO-2 S b	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

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

Machine-readable: /api/v1/object/xo-2-s-c · Registry entry updated 2026-08-14.