HAT-P-2

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
HAT-P-2
HAT-P-2 b	5.63 d	> 2739.69 M_⨁	Transit	2007	Bakos et al. 2007	Confirmed Planet
HAT-P-2 c	8500 d	3400.76 M_⨁	Radial Velocity	2023	de Beurs et al. 2023	Confirmed Planet

Exoplanet Archive Notes (3)

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HAT-P-2 b

Orbital inclination scaled to 1-sigma. (Bakos et al. 2007)
Planetary parameter values drawn from Table 7, model "G1+GAO+PO" in ref. (Garai et al. 2017)
HAT-P-2 b planet parameters taken from Table 2, (v) Evolving Two Planets (Two Keplerians) (de Beurs et al. 2023)

HAT-P-2 Stellar Parameters (18 Solutions)

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RA: 16h20m36.34s

Dec: +41d02m52.66s

Distance: 127.774+0.425-0.423
pc

Parallax: 7.7974900±0.0257663 mas

Ecliptic Latitude: 61.01151 deg

Ecliptic Longitude: 229.15796 deg

Galactic Latitude: 45.2323 deg

Galactic Longitude: 65.02085 deg

Total Proper Motion: 30.9650963±0.0509183 mas/yr

Proper Motion (RA): -10.3120000±0.0409495 mas/yr

Proper Motion (Dec): -29.197600±0.052028 mas/yr

Photometry: m_V
8.72±0.03; m_TESS
8.27468±0.00610; m_J
7.796±0.027; m_H
7.652±0.038; m_Ks
7.603±0.020; m_W1
7.571±0.025; m_W2
7.582±0.020; m_W3
7.581±0.017; m_W4
7.567±0.102; m_Gaia
8.59842±0.00025; m_B
9.150±0.028

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; Stellar Hosts

Source	de Beurs et al. 2023	TICv8	Ment et al. 2018	Gaia DR2	Bonomo et al. 2017	Stassun et al. 2017	de Wit et al. 2017	Garai et al. 2017	Salz et al. 2015	Tsantaki et al. 2014	Knutson et al. 2014	Southworth 2010	Pal et al. 2010	Loeillet et al. 2008	Torres et al. 2008	Bakos et al. 2007	Cannon & Pickering 1918	ExoFOP
T_eff (K)	---	6412.830+102.682-110.120	6380	6338.3496+156.1500-115.6500	6290±60	6412±1	---	---	6300	6414±51	---	6290±60	6290±60	---	6290±110	6290±110	---	6412.8±106.4
L_✶ (log₁₀(L_⦿))	---	0.6457905+0.0202149-0.0128414	0.53±0.08	0.6402163+0.0024223-0.0024359	---	---	---	---	---	---	---	---	0.577 +0.052-0.046	---	0.505+0.099-0.087	0.485+0.052-0.134	---	---
Metallicity (dex)	---	0.0535135±0.0406867 [M/H]	0.18 [Fe/H]	---	0.140±0.080	0.06 [Fe/H]	---	---	---	0.04±0.05 [Fe/H]	0.14±0.08 [Fe/H]	0.14±0.08 [Fe/H]	0.14±0.08 [Fe/H]	0.11±0.10	0.12±0.08 [Fe/H]	0.12±0.08	---	---
v sin i (km/s)	---	---	---	---	20.80±0.30	---	---	---	---	20.50±1.34	---	---	20.8±0.3	21.3±1.3	---	19.8±1.6	---	---
Age (Gyr)	---	---	1.44±0.47	---	2.60±0.50	---	---	---	0.4	---	---	2.6+0.6-0.8	2.6±0.5	---	2.6±0.8	2.6+0.8-1.4	---	---
M_✶ (M_⦿)	1.33±0.03	1.290000+0.224551-0.158558	1.33±0.03	---	1.360±0.040	1.93±0.49	---	---	---	1.34±0.09	1.36±0.04	1.279±0.046	1.36±0.04	1.298+0.062-0.098	1.308+0.088-0.078	1.298+0.062-0.098	---	---
R_✶ (R_⦿)	---	1.7039200+0.0804382-0.0528432	1.39±0.09	1.7330393+0.0650160-0.0823347	1.640+0.090-0.080	1.71±0.06	---	---	---	1.54±0.12	---	1.68±0.15	1.64 +0.09-0.08	1.416+0.040-0.062	1.506+0.130-0.096	1.474+0.042-0.167	---	1.70±0.07
log g (log₁₀(cm/s²))	---	4.0857600+0.0871321-0.0742658	---	---	---	4.16±0.02	---	---	---	4.18±0.22	---	4.092±0.074	4.16±0.03	---	4.199+0.043-0.053	4.214+0.085-0.015	---	4.09±0.08
Sp. T	---	---	F8	---	---	---	---	---	F8 V	---	---	---	---	---	---	F8	F8	---
ρ_✶ (g/cm³)	---	0.3676291+0.0875299-0.0684493	---	---	---	0.55±0.13	0.434±0.020	---	---	---	---	0.378±0.099	---	---	0.618+0.006-0.160	---	---	---
γ (km/s)	---	---	---	-20.363631118560065±0.345721474113717	---	---	---	-0.220±0.022	---	---	---	---	---	---	---	---	---	---

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HAT-P-2 b Planetary Parameters (17 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; Atmospheric Spectroscopy

Source	Ment et al. 2018	de Beurs et al. 2023	Kokori et al. 2023	Patel & Espinoza 2022	Ivshina & Winn 2022	Bonomo et al. 2017	Stassun et al. 2017	de Wit et al. 2017	Garai et al. 2017	Salz et al. 2015	Knutson et al. 2014	Southworth 2010	Pal et al. 2010	Loeillet et al. 2008	Torres et al. 2008	Bakos et al. 2007	ExoFOP
a/R_✶	---	---	8.99+0.39-0.41	9.04+0.19-0.18	---	---	9.720±0.760	---	---	---	---	8.0192+0.7450-0.6283	8.99 +0.39-0.41	10.28+0.12-0.19	10.12+0.03-0.99	9.770+1.100-0.020	---
T_eq (K)	---	---	---	---	---	---	---	---	---	1700	---	1516±66	1540±30	---	1398+61-33	---	1372
b	---	---	---	0.457+0.035-0.040	---	---	---	---	---	---	---	---	0.395 +0.080-0.123	---	0.0+0.4-0.0	---	---
ω (deg)	188.01±0.20	188.80+0.57-0.58	185.22±0.95	---	---	186.96+0.87-0.88	---	188.44±0.43	181±5	---	186.2±1.1	---	185.22±0.95	189.92+1.06-1.20	---	179.3±3.6	---
M_p (M_⨁)	---	2867±32	---	---	---	2765+60-64	3633±617	---	---	2828.6	3175±73	2778±86	2888.95±76.28	2740+124-175	2771+124-114	2873±159	---
M_p (M_Jup)	---	9.02±0.10	---	---	---	8.70+0.19-0.20	11.43±1.94	---	---	8.9	9.990±0.230	8.74±0.27	9.09±0.24	8.62+0.39-0.55	8.72+0.39-0.36	9.04±0.50	---
e	0.5172±0.0019	0.502+0.011-0.012	0.5171±0.0033	---	---	0.50833+0.00082-0.00075	0.52±0.00	0.51023±0.00042	0.510±0.016	0.5	0.50790+0.00093-0.00079	---	0.5171±0.0033	0.5163+0.0025-0.0023	---	0.520±0.010	---
i (deg)	---	---	86.72+1.12-0.87	---	---	86.72+1.10-0.87	86.72±1.00	86.16±0.26	87.2±0.3	---	---	85.9±1.5	86.72 +1.12-0.87	90.00+0.85-0.93	90.0+0.0-3.4	>87.3	---
P (days)	5.6335158±0.0000036	5.63346964+0.00000063-0.00000062	5.63346785±0.00000061	5.6335152±0.0000034	5.63346961±0.00000064	5.6334754±0.0000026	5.633470±0.000006	5.6334675±0.0000013	5.633472	5.6	---	5.6334729±0.0000061	5.6334729±0.0000061	5.63341	5.633320	5.63341±0.00013	5.633477±0.000001
ρ (g/cm³)	---	---	---	---	---	7.3+1.4-1.1	---	---	---	7.3	---	6.8±2.0	7.29±1.12	12.5+2.6-3.6	10.7+2.5-2.3	11.9+4.8-1.6	---
R_p (R_⨁)	---	---	---	---	---	12.97+0.82-0.71	13.5±0.9	---	---	12.3	---	13.3±1.3	12.969 +0.818-0.695	10.66+0.44-0.59	11.24+0.94-0.74	11.01+0.43-1.18	13.258300±0.519371
R_p (R_Jup)	---	---	---	---	---	1.157+0.073-0.063	1.20±0.08	---	---	1.1	---	1.19±0.12	1.157 +0.073-0.062	0.9510+0.0390-0.0530	1.003+0.084-0.066	0.9820+0.0380-0.1050	1.1828283±0.0463353
R_p/R_✶	---	---	0.07227±0.00061	0.0691±0.0004	---	---	---	---	0.0678±0.0002	---	---	---	0.07227±0.00061	0.06891+0.00090-0.00086	0.06840+0.00087-0.00073	0.0684±0.0009	---
K (m/s)	953.3±3.6	---	---	---	---	938.1+10.0-9.9	983.90±17.20	---	930±42	---	929±11	983.90±17.20	983.9±17.2	966.9±8.3	968.6±8.3	1011±38	---
a (au)	0.06814±0.00051	---	---	---	---	0.06880+0.00065-0.00070	---	---	---	0.068	---	0.06740±0.00081	0.06878±0.00068	0.0677+0.0011-0.0017	0.0679+0.0015-0.0014	0.0677±0.0014	---
T₁₄ (hours)	---	---	---	---	---	---	---	---	---	---	---	---	4.2888±0.0312	---	---	4.25±0.05	4.132±0.081
T_C (days)	---	---	2458657.66292±0.00011 (BJD-TDB)	2459006.93776+0.00033-0.00035 (BJD)	2455756.42709±0.00034 (BJD-TDB)	2455288.84910±0.00037 (BJD-TDB)	---	2455288.84969±0.00039 (BJD)	2454387.4937 (HJD)	---	---	---	2454387.49375±0.00074 (BJD)	---	---	2454212.8559±0.0007 (HJD)	2460477.2759070±0.0001407 (BJD)
δ (%)	---	---	---	---	---	---	0.520±0.061	0.4941±0.0039	---	---	---	---	---	---	---	---	0.56510000±0.00222349
Occ. Depth (%)	---	---	---	---	---	---	---	0.0971±0.0021	---	---	---	---	---	---	---	---	---
T_p (days)	2463982.4915±0.0024 (JD)	2455289.48643+0.00033-0.00034 (JD)	---	---	---	---	---	---	---	---	---	---	---	2454213.4794+0.0053-0.0030 (HJD)	---	2454213.369±0.041 (HJD)	---
M_p sin i (M_⨁)	2740±54	2867±32	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
M_p sin i (M_Jup)	8.62±0.17	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
λ (deg)	---	---	---	---	---	---	---	---	---	---	---	---	---	0.2 +12.2-12.5	---	---	---
S (S_⨁)	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	588.518

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HAT-P-2 c Planetary Parameters (1 Solution)

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Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	de Beurs et al. 2023
T_p (days)	2454150+430-800 (BJD-TDB)
ω (deg)	38±32
M_p (M_⨁)	3401+1653-699
M_p (M_Jup)	10.7+5.2-2.2
e	0.37+0.13-0.12
i (deg)	90.0±16.0
P (days)	8500+2600-1500
K (m/s)	89.0+39.0-13.0

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Ancillary Information (7 Unique Files)

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+ HAT-P-2 (3 File Types, 7 Files)

Literature Time Series (3 File Types, 7 Files)

File Type	Data Points	Filter	Reference
Photometric Light Curve	127	Hp (Hipparcos)	Hipparcos and Tycho Catalogs
Radial Velocity Curve	14	Optical Spectra	Pal et al. 2010
Radial Velocity Curve	63	Optical Spectra	Loeillet et al. 2008
Radial Velocity Curve	53	Optical Spectra	Bakos et al. 2007
Radial Velocity Curve	13	Optical Spectra	Bakos et al. 2007
Radial Velocity Curve	10	Optical Spectra	Bakos et al. 2007
Amateur Light Curve	342	R (Generic)	Amateur-Contributed Light Curves

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 2 Confirmed Planets; 1 2MASS Point Source Catalog

Data Files: 1 SuperWASP Time Series; 2 Associated Literature Data

Bibliography (31 References)

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Spectroscopically Resolved Partial Phase Curve of the Rapid Heating and Cooling of the Highly Eccentric Hot Jupiter HAT-P-2b with WFC3
Jacobs et al. 2025 Reference Overview
Exploring the Ability of Hubble Space Telescope WFC3 G141 to Uncover Trends in Populations of Exoplanet Atmospheres through a Homogeneous Transmission Survey of 70 Gaseous Planets
Edwards et al. 2023 Reference Overview
Revisiting Orbital Evolution in HAT-P-2 b and Confirmation of HAT-P-2 c
de Beurs et al. 2023 Reference Overview
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
Kokori et al. 2023 Reference Overview
Emergent Spectral Fluxes of Hot Jupiters: An Abrupt Rise in Dayside Brightness Temperature Under Strong Irradiation
Deming et al. 2023 Reference Overview
Empirical Limb-darkening Coefficients and Transit Parameters of Known Exoplanets from TESS
Patel & Espinoza 2022 Reference Overview
Five Key Exoplanet Questions Answered via the Analysis of 25 Hot-Jupiter Atmospheres in Eclipse
Changeat et al. 2022 Reference Overview
TESS Transit Timing of Hundreds of Hot Jupiters
Ivshina & Winn 2022 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810
Ment et al. 2018 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
Bonomo et al. 2017 Reference Overview
Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
Stassun et al. 2017 Reference Overview
Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System
de Wit et al. 2017 Reference Overview
Affordable echelle spectroscopy of the eccentric HAT-P-2, WASP-14, and XO-3 planetary systems with a sub-meter-class telescope
Garai et al. 2017 Reference Overview
High-energy irradiation and mass loss rates of hot Jupiters in the solar neighborhood
Salz et al. 2015 Reference Overview
Spectroscopic parameters for solar-type stars with moderate-to-high rotation. New parameters for ten planet hosts
Tsantaki et al. 2014 Reference Overview
Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
Knutson et al. 2014 Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
Homogeneous studies of transiting extrasolar planets - III. Additional planets and stellar models
Southworth 2010 Reference Overview
Exoplanet Archive Help: Amateur Light Curves
Amateur-Contributed Light Curves
Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system
Pal et al. 2010 Reference Overview
Refined parameters and spectroscopic transit of the super-massive planet HD 147506b
Loeillet et al. 2008 Reference Overview
Improved Parameters for Extrasolar Transiting Planets
Torres et al. 2008 Reference Overview
HD 147506b: A Supermassive Planet in an Eccentric Orbit Transiting a Bright Star
Bakos et al. 2007 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
The Hipparcos and Tycho Photometric System Passbands
Tycho 2 converted using Bessell 2000 Reference Overview
The Tycho-2 catalog of the 2.5 million brightest stars
The Tycho-2 Catalog Reference Overview
The Hipparcos and Tycho Catalogs
Hipparcos and Tycho Catalogs Reference Overview
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 Reference Overview

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
Browse
Download

Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/HAT-P-2.json

Catalog Parameters

RA

ra

16h20m36.34s

Dec

dec

+41d02m52.66s

β

elat

61.01151

λ

elon

229.15796

b

glat

45.2323

l

glon

65.02085

m_V

sy_vmag

8.72±0.03

m_TESS

sy_tmag

8.27468±0.00610

m_J

sy_jmag

7.796±0.027

m_H

sy_hmag

7.652±0.038

m_Ks

sy_kmag

7.603±0.020

sy_kepmag

no_data

m_W1

sy_w1mag

7.571±0.025

m_W2

sy_w2mag

7.582±0.020

m_W3

sy_w3mag

7.581±0.017

m_W4

sy_w4mag

7.567±0.102

sy_icmag

no_data

m_Gaia

sy_gaiamag

8.59842±0.00025

m_B

sy_bmag

9.150±0.028

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

30.9650963±0.0509183

μ_δ

sy_pmdec

-29.197600±0.052028

μ_α

sy_pmra

-10.3120000±0.0409495

π

sy_plx

7.7974900±0.0257663

Distance

sy_dist

127.774+0.425-0.423

Set Parameters

R_✶

st_rad

1.64 +0.09-0.08

T_eff

st_teff

6290±60

HAT-P-2 Overview

HAT-P-2 Architecture & Discovery Information

HAT-P-2