UPSA Object Registry
Registry · deep sky

51 Peg

Star G5V
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
22h 57m 28.21s
Declination
+20° 46′ 08.7″
Galactic l, b
90.064, -34.73
Distance
15.461 pc

Published measurements

3 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 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
1.07 M_sun ± 0.05 NASA Exoplanet Archive Cont et al. 2026 2026
1.069296 M_sun ± 0.04744 NASA Exoplanet Archive Rosenthal et al. 2021 2021
1.04 M_sun NASA Exoplanet Archive Martins et al. 2015 2015
1.03 M_sun ± 0.1667 NASA Exoplanet Archive TICv8 2006

Radius 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
1.19 R_sun ± 0.03 NASA Exoplanet Archive Cont et al. 2026 2026
1.186744 R_sun ± 0.0277 NASA Exoplanet Archive Rosenthal et al. 2021 2021
1.17561 R_sun ± 0.06736 NASA Exoplanet Archive TICv8 2006
1.29 R_sun NASA Exoplanet Archive Mayor & Queloz 1995 1995

Effective temperature 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
5,761 K ± 95 NASA Exoplanet Archive Cont et al. 2026 2026
5,760.76 K ± 95.49 NASA Exoplanet Archive Rosenthal et al. 2021 2021
5,758 K ± 101.6 NASA Exoplanet Archive TICv8 2006
5,773 K NASA Exoplanet Archive Mayor & Queloz 1995 1995

Related objects

ObjectTypeRelation
51 Peg b Exoplanethost

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
51 Peg b Exoplanet 0″ 5.453
* 51 Peg HighPM* 3.35″ 5.46
* 51 Peg b Planet 3.35″ —
SDSS J225738.50+204223.4 QSO 267.7″ —
SDSS J225735.26+205048.7 QSO 297″ —
G 128-23 HighPM* 427.3″ —
SDSS J225717.43+203926.4 QSO 429.8″ —
SDSS J225720.31+203855.3 QSO 447.4″ —
SDSS J225750.80+204044.5 QSO 453.5″ —
SDSS J225707.83+205214.8 QSO 464.4″ —

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-peg · Registry entry updated 2026-08-14.