UPSA Object Registry
Registry · exoplanet

XO-1 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
16h 02m 11.83s
Declination
+28° 10′ 10.6″
Galactic l, b
45.853, 48.02
Magnitude V
11.25
Distance
163.55 pc

Planet

NASA Exoplanet Archive, composite parameters
Host starXO-1 · G1 V
DiscoveryTransit, 2006 · XO
Orbital period3.94153 d
Semi-major axis0.0488 au
Eccentricity0
Radius12.778 R⊕ · 1.14 R♃
Mass263.8 M⊕ · 0.83 M♃
Density0.64 g/cm³
Equilibrium temperature1,210 K
System distance163.55 pc

Published measurements

6 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 7 values

ValueUnitUncertainty Band / methodSourceReferenceYear
290.1788 M_earth ± 12.08 Transit NASA Exoplanet Archive Bonomo et al. 2017 2017
263.7989 M_earth ± 41.32 Transit NASA Exoplanet Archive Stassun et al. 2017 2017
292.391 M_earth ± 25.43 Transit NASA Exoplanet Archive Burke et al. 2010 2010
293.6749 M_earth ± 24.47 Transit NASA Exoplanet Archive Southworth 2010 2010
291.7679 M_earth ± 25.74 Transit NASA Exoplanet Archive Torres et al. 2008 2008
286.047 M_earth Transit NASA Exoplanet Archive Holman et al. 2006 2006
286.047 M_earth ± 22.25 Transit NASA Exoplanet Archive McCullough et al. 2006 2006

Radius 9 values

ValueUnitUncertainty Band / methodSourceReferenceYear
13.51805 R_earth ± 0.5268 Transit NASA Exoplanet Archive Bonomo et al. 2017 2017
12.77826 R_earth ± 0.7846 Transit NASA Exoplanet Archive Stassun et al. 2017 2017
13.563 R_earth ± 0.336 Transit NASA Exoplanet Archive Burke et al. 2010 2010
13.51805 R_earth ± 0.4596 Transit NASA Exoplanet Archive Southworth 2010 2010
13.51805 R_earth ± 0.5268 Transit NASA Exoplanet Archive Torres et al. 2008 2008
15.02006 R_earth ± 1.345 Transit NASA Exoplanet Archive Wilson et al. 2006 2006
13.27146 R_earth ± 0.3139 Transit NASA Exoplanet Archive Holman et al. 2006 2006
14.5717 R_earth ± 1.233 Transit NASA Exoplanet Archive McCullough et al. 2006 2006
13.8352 R_earth ± 0.5941 Transit NASA Exoplanet Archive ExoFOP 2006

Orbital period 14 values

ValueUnitUncertainty Band / methodSourceReferenceYear
3.941505 d ± 2.00e-07 Transit NASA Exoplanet Archive Kokori et al. 2023 2023
3.941516 d ± 2.30e-05 Transit NASA Exoplanet Archive Patel & Espinoza 2022 2022
3.941505 d ± 1.80e-07 Transit NASA Exoplanet Archive Kokori et al. 2022 2022
3.941505 d ± 4.10e-07 Transit NASA Exoplanet Archive Ivshina & Winn 2022 2022
3.941507 d ± 1.80e-07 Transit NASA Exoplanet Archive Bonomo et al. 2017 2017
3.94153 d ± 2.70e-05 Transit NASA Exoplanet Archive Stassun et al. 2017 2017
3.941507 d ± 2.02e-06 Transit NASA Exoplanet Archive Burke et al. 2010 2010
3.941513 d ± 2.80e-06 Transit NASA Exoplanet Archive Southworth 2010 2010
3.941501 d ± 1.00e-06 Transit NASA Exoplanet Archive Raetz et al. 2009 2009
3.941513 d ± 2.80e-06 Transit NASA Exoplanet Archive Caceres et al. 2009 2009
3.941534 d Transit NASA Exoplanet Archive Torres et al. 2008 2008
3.941634 d ± 0.000137 Transit NASA Exoplanet Archive Wilson et al. 2006 2006
Show the remaining 2
ValueUnitUncertainty Band / methodSourceReferenceYear
3.941534 d ± 2.70e-05 Transit NASA Exoplanet Archive McCullough et al. 2006 2006
3.941504 d ± 1.90e-06 Transit NASA Exoplanet Archive ExoFOP 2006

Semi-major axis 5 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.0493 au ± 0.00091 Transit NASA Exoplanet Archive Bonomo et al. 2017 2017
0.049 au ± 0.001 Transit NASA Exoplanet Archive Burke et al. 2010 2010
0.04944 au ± 0.0008 Transit NASA Exoplanet Archive Southworth 2010 2010
0.04928 au ± 0.00089 Transit NASA Exoplanet Archive Torres et al. 2008 2008
0.0488 au ± 0.0005 Transit NASA Exoplanet Archive McCullough et al. 2006 2006

Eccentricity 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.019 Transit NASA Exoplanet Archive Bonomo et al. 2017 2017
0 Transit NASA Exoplanet Archive Stassun et al. 2017 2017
0 Transit NASA Exoplanet Archive Burke et al. 2010 2010

Equilibrium temperature 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
1,210 K ± 16 Transit NASA Exoplanet Archive Southworth 2010 2010
1,196 K ± 23 Transit NASA Exoplanet Archive Torres et al. 2008 2008
1,100 K Transit NASA Exoplanet Archive Holman et al. 2006 2006
1,179 K Transit NASA Exoplanet Archive ExoFOP 2006

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
XO-1 Star 0″ —
BD+28 2507 Variable* 0.3534″ 11.25
BD+28 2507b Planet 0.3534″ —
2MASS J16021311+2809004 Star 72.23″ —
2MASS J16023999+2809023 ChemPec* 378.8″ —
HD 143971 Star 441.6″ 9.53
QSO B1600+284 QSO 454.1″ 19.95
2MASS J16014364+2804176 RGB* 513.4″ —
2MASS J16025091+2809341 RGB* 518.2″ —
LEDA 3495817 Galaxy 526″ —
TYC 2041-1282-1 HorBranch* 526.3″ 11.35

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-1-b · Registry entry updated 2026-08-14.