UPSA Object Registry
Registry · exoplanet

HAT-P-11 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
19h 50m 50.44s
Declination
+48° 04′ 54.7″
Galactic l, b
81.835, 10.77
Magnitude V
9.46
Distance
37.765 pc

Planet

NASA Exoplanet Archive, composite parameters
Host starHAT-P-11 · K4
DiscoveryRadial Velocity, 2018 · W. M. Keck Observatory
Orbital period3,361 d
Semi-major axis4.1 au
Eccentricity0.652
Radius13.2 R⊕ · 1.18 R♃
Mass851.78 M⊕ · 2.68 M♃
Density2.04 g/cm³
Equilibrium temperature91.58 K
System distance37.765 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
851.7801 M_earth ± 130.3 Radial Velocity NASA Exoplanet Archive An et al. 2025 2025
731.009 M_earth ± 222.5 Radial Velocity NASA Exoplanet Archive Xuan & Wyatt 2020 2020
507 M_earth ± 30 Radial Velocity NASA Exoplanet Archive Yee et al. 2018 2018

Orbital period 5 values

ValueUnitUncertainty Band / methodSourceReferenceYear
3,361 d ± 31 Radial Velocity NASA Exoplanet Archive An et al. 2025 2025
3,299 d ± 53 Radial Velocity NASA Exoplanet Archive Yee et al. 2024 2024
3,407 d ± 360 Radial Velocity NASA Exoplanet Archive Bourrier et al. 2023 2023
3,397 d ± 71 Radial Velocity NASA Exoplanet Archive Xuan & Wyatt 2020 2020
3,407 d ± 360 Radial Velocity NASA Exoplanet Archive Yee et al. 2018 2018

Semi-major axis 2 values

ValueUnitUncertainty Band / methodSourceReferenceYear
4.1 au ± 0.06 Radial Velocity NASA Exoplanet Archive An et al. 2025 2025
4.13 au ± 0.29 Radial Velocity NASA Exoplanet Archive Yee et al. 2018 2018

Eccentricity 5 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.652 ± 0.017 Radial Velocity NASA Exoplanet Archive An et al. 2025 2025
0.617 ± 0.027 Radial Velocity NASA Exoplanet Archive Yee et al. 2024 2024
0.601 ± 0.032 Radial Velocity NASA Exoplanet Archive Bourrier et al. 2023 2023
0.604 ± 0.03 Radial Velocity NASA Exoplanet Archive Xuan & Wyatt 2020 2020
0.601 ± 0.032 Radial Velocity NASA Exoplanet Archive Yee et al. 2018 2018

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
HAT-P-11 Star 0″ —
HAT-P-11 b Exoplanet 0″ 9.46
BD+47 2936b Planet 4.103″ —
BD+47 2936c Planet 4.103″ —
BD+47 2936 EclBin 4.103″ —
KOI-1289 Star 7.281″ —
2MASS J19505503+4805036 Star 46.78″ —
2MASS J19504579+4804018 Star 70.58″ —
Z 257-17 GtowardsGroup 87.52″ —
2MASS J19505813+4805365 Star 87.57″ —
2MASS J19504260+4803129 Star 128.6″ —

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/hat-p-11-c · Registry entry updated 2026-08-14.