Registry · exoplanet

HAT-P-11 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: 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 star	HAT-P-11 · K4
Discovery	Transit, 2010 · HATNet
Orbital period	4.888 d
Semi-major axis	0.05258 au
Eccentricity	0.251
Radius	4.36 R⊕ · 0.389 R♃
Mass	25 M⊕ · 0.0787 M♃
Density	1.172 g/cm³
Equilibrium temperature	838 K
System distance	37.765 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

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
23.5193	M_earth	± 1.271	Transit	NASA Exoplanet Archive	An et al. 2025	2025
25	M_earth	± 1.5	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
23.4	M_earth	± 1.5	Transit	NASA Exoplanet Archive	Yee et al. 2018	2018
28.6047	M_earth	± 3.178	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
24.02795	M_earth	± 2.765	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
26.69772	M_earth	± 2.225	Transit	NASA Exoplanet Archive	Southworth 2011	2011
25.743	M_earth	± 2.86	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010

Radius 13 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
4.901	R_earth	± 0.065	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
4.36	R_earth	± 0.06	Transit	NASA Exoplanet Archive	Yee et al. 2018	2018
4.737	R_earth	± 0.201	Transit	NASA Exoplanet Archive	Berger et al. 2018	2018
4.81987	R_earth	± 0.2242	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
4.71	R_earth	± 0.07	Transit	NASA Exoplanet Archive	Morton et al. 2016	2016
4.449973	R_earth	± 0.1009	Transit	NASA Exoplanet Archive	Southworth 2011	2011
5.29152	R_earth	± 0.3367	Transit	NASA Exoplanet Archive	ExoFOP	2010
4.73	R_earth	± 0.157	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010
4.84	R_earth	± 0.19	Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2010
4.68	R_earth	± 0.18	Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2010
4.84	R_earth	± 0.19	Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2010
4.84	R_earth	± 0.19	Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2010

Show the remaining 1

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
4.82	R_earth	± 0.17	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2010

Orbital period 21 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
4.888	d	± 0.0001	Transit	NASA Exoplanet Archive	An et al. 2025	2025
4.887802	d	± 3.40e-08	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
4.887802	d	± 3.40e-08	Transit	NASA Exoplanet Archive	Bourrier et al. 2023	2023
4.887802	d	± 1.70e-07	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
4.887802	d	± 4.40e-07	Transit	NASA Exoplanet Archive	Ivshina & Winn 2022	2022
4.887801	d	± 3.00e-07	Transit	NASA Exoplanet Archive	Kokori et al. 2022	2022
4.887802	d	± 1.60e-07	Transit	NASA Exoplanet Archive	Chachan et al. 2019	2019
4.887802	d		Transit	NASA Exoplanet Archive	Yee et al. 2018	2018
4.88782	d	± 7.00e-06	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
4.887803	d	± 1.77e-07	Transit	NASA Exoplanet Archive	Morton et al. 2016	2016
4.887803	d	± 4.00e-08	Transit	NASA Exoplanet Archive	Holczer et al. 2016	2016
4.887815	d	± 6.80e-07	Transit	NASA Exoplanet Archive	Southworth 2011	2011

Show the remaining 9

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
4.887805	d	± 1.30e-06	Transit	NASA Exoplanet Archive	Sanchis-Ojeda & Winn 2011	2011
4.887804	d	± 9.00e-07	Transit	NASA Exoplanet Archive	ExoFOP	2010
4.887803	d	± 4.66e-07	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 Supplemental KOI Table	2010
4.887816	d	± 7.10e-06	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010
4.887803	d	± 1.77e-07	Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2010
4.8878	d	± 5.50e-07	Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2010
4.887803	d	± 1.77e-07	Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2010
4.887803	d	± 1.77e-07	Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2010
4.887803	d	± 4.66e-07	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2010

Semi-major axis 10 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.05258	au	± 0.0006	Transit	NASA Exoplanet Archive	An et al. 2025	2025
0.0532	au	± 0.001	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
0.05254	au	± 0.00064	Transit	NASA Exoplanet Archive	Yee et al. 2018	2018
0.05259	au	± 0.00062	Transit	NASA Exoplanet Archive	Southworth 2011	2011
0.053	au	± 0.0002	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010
0.053	au		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2010
0.052	au		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2010
0.053	au		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2010
0.053	au		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2010
0.053	au		Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2010

Eccentricity 13 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.251	± 0.045	Transit	NASA Exoplanet Archive	An et al. 2025	2025
0.2577	± 0.0033	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
0.264353	± 0.000602	Transit	NASA Exoplanet Archive	Bourrier et al. 2023	2023
0.2	± 0.05	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
0.218	± 0.034	Transit	NASA Exoplanet Archive	Yee et al. 2018	2018
0.2	± 0.05	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.232	± 0.054	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
0.198	± 0.046	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010
0		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2010
0		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2010
0		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2010
0		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2010

Show the remaining 1

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0			Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2010

Equilibrium temperature 9 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
847	K	± 46	Transit	NASA Exoplanet Archive	Basilicata et al. 2024	2024
838	K	± 10	Transit	NASA Exoplanet Archive	Southworth 2011	2011
810	K		Transit	NASA Exoplanet Archive	ExoFOP	2010
878	K	± 15	Transit	NASA Exoplanet Archive	Bakos et al. 2010	2010
801	K		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2010
794	K		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2010
801	K		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2010
801	K		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2010
800	K		Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2010

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
HAT-P-11	Star	0″	—
HAT-P-11 c	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

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

Machine-readable: /api/v1/object/hat-p-11-b · Registry entry updated 2026-08-14.