K2-291 Overview

K2-291 0.90 R_⦿ 5520.00 K

K2-291 b

0.142 R_Jup

Overview Parameters Nearby Data Bibliography 9 Legend Expand All

K2-291 Architecture & Discovery Information

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-291
K2-291 b	2.23 d	1.59 R_⨁	Transit	2019	Kosiarek et al. 2019	Confirmed Planet

K2-291 Stellar Parameters (6 Solutions)

RA: 05h05m47.03s

Dec: +21d32m53.52s

Distance: 90.0562+0.4953-0.4900
pc

Parallax: 11.0758000±0.0602907 mas

Ecliptic Latitude: -1.30047 deg

Ecliptic Longitude: 77.40225 deg

Galactic Latitude: -11.58155 deg

Galactic Longitude: 181.1789 deg

Total Proper Motion: 101.8238260±0.0607347 mas/yr

Proper Motion (RA): 30.711500±0.097787 mas/yr

Proper Motion (Dec): -97.0819000±0.0556858 mas/yr

Photometry: m_V
10.014±0.005; m_TESS
9.3928±0.0061; m_J
8.765±0.032; m_H
8.407±0.017; m_Ks
8.353±0.020; m_Kep
9.891; m_W1
8.291±0.024; m_W2
8.346±0.021; m_W3
8.323±0.023; m_W4
8.304±0.325; m_Gaia
9.86639±0.00071; m_B
10.832±0.067

Abundances (Hypatia Catalog): [Fe/H] 0.11±0.04 dex; [C/H] -0.02±0.09 dex; [Na/H] -0.04±0.04 dex; [Mg/H] 0.13±0.07 dex; [Al/H] 0.02±0.06 dex; [Ca/H] 0.15±0.06 dex; [BaII/H] 0.20±0.19 dex

Mission: K2 : Observed in Campaign 13

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; K2 Names; K2 Planets and Candidates; K2 Targets; Stellar Hosts; K2 Time Series

Source	Howard et al. 2025	TICv8	Dai et al. 2019	Kosiarek et al. 2019	Gaia DR2	ExoFOP
T_eff (K)	5520.0±60.0	5509.0000+99.1643-144.2130	5520±60	5520±60	5416.1675+140.3325-101.6172	5509.0±121.7
L_✶ (log₁₀(L_⦿))	---	-0.1563288+0.0113311-0.0104382	---	-0.166+0.009-0.010	-0.14980319+0.00310803-0.00313044	---
Metallicity (dex)	0.080±0.040 [Fe/H]	---	0.080±0.040 [Fe/H]	0.080+0.040-0.050 [Fe/H]	---	---
γ (km/s)	---	---	---	25.1262+0.0034-0.0035	24.579967755852106±0.196535131212576	---
v sin i (km/s)	---	---	---	<2.0	---	---
Age (Gyr)	---	---	---	3.72+3.70-2.51	---	---
M_✶ (M_⦿)	0.934±0.038	0.9700000+0.1317330-0.1151820	0.926+0.046-0.048	0.934±0.038	---	---
R_✶ (R_⦿)	0.934±0.038	0.9169440+0.0526050-0.0413799	0.904±0.012	0.899+0.035-0.033	0.95579970+0.03690030-0.04766890	0.92±0.05
log g (log₁₀(cm/s²))	4.50±0.05	4.5001500+0.0799247-0.0799230	4.50±0.05	4.50±0.05	---	4.50±0.08
ρ_✶ (g/cm³)	---	1.7738153+0.3839239-0.4123220	1.77+0.13-0.14	---	---	---

K2-291 b Planetary Parameters (4 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; K2 Names; K2 Planets and Candidates; Transit

Source	Kosiarek et al. 2019	Howard et al. 2025	Dai et al. 2019	ExoFOP
T_eq (K)	---	1278.0±30.0	---	1203
S (S_⨁)	633+59-56	633.0+59.0-56.0	---	348.601
P (days)	2.225177+0.000066-0.000068	2.225177+0.000066-0.000068	2.225	2.2251639±0.0000244
R_p (R_⨁)	1.589+0.095-0.072	1.589+0.095-0.072	1.582+0.037-0.042	1.504360±0.179303
R_p (R_Jup)	0.1418+0.0085-0.0064	0.1418+0.0085-0.0064	0.1411+0.0033-0.0037	0.1342102±0.0159964
δ (%)	---	---	---	0.0284000±0.0047875
T₁₄ (hours)	1.719+0.041-0.032	---	---	1.545±0.772
T_C (days)	2457830.06163+0.00099-0.00104 (BJD-TDB)	2457830.06163+0.00099-0.00104 (BJD)	---	2460257.7177160±0.0239963 (BJD)
M_p (M_⨁)	6.49±1.16	6.49±1.16	6.4±1.1	---
M_p (M_Jup)	0.0204±0.0036	0.0204±0.0036	0.020±0.003	---
ρ (g/cm³)	8.840+2.500-2.030	8.840+2.500-2.030	8.90+2.20-2.30	---
a/R_✶	7.7942+0.0984-0.1019	---	---	---
b	0.646+0.021-0.026	---	---	---
ω (deg)	0	---	---	---
e	0	---	---	---
i (deg)	85.26+0.23-0.20	---	---	---
R_p/R_✶	0.01614+0.00062-0.00033	---	0.01603+0.00031-0.00037	---
K (m/s)	3.33±0.59	---	3.31±0.56	---
a (au)	0.03261±0.00044	---	---	---

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 1 K2 Targets; 2 2MASS Point Source Catalog

Data Files: 4 KELT Time Series; 1 SuperWASP Time Series; 1 K2 Time Series; 1 Associated Literature Data

Bibliography (9 References)

Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Homogeneous Analysis of Hot Earths: Masses, Sizes, and Compositions
Dai et al. 2019 Reference Overview
K2-291b: A Rocky Super-Earth in a 2.2 day Orbit
Kosiarek et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
EPIC Catalog Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
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Transit Prediction Service
Time Series
Kepler | K2

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