K2-99

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-99
K2-99 b	18.25 d	11.88 R_⨁	Transit	2016	Smith et al. 2017	Confirmed Planet
K2-99 c	522.2 d	> 2669.76 M_⨁	Radial Velocity	2022	Smith et al. 2022	Confirmed Planet

K2-99 Stellar Parameters (10 Solutions)

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RA: 13h55m05.70s

Dec: -05d26m32.98s

Distance: 519.229+12.998-12.389
pc

Parallax: 1.8983600±0.0466995 mas

Ecliptic Latitude: 5.9458 deg

Ecliptic Longitude: 208.67834 deg

Galactic Latitude: 53.97598 deg

Galactic Longitude: 330.5855 deg

Total Proper Motion: 2.0139273±0.0600154 mas/yr

Proper Motion (RA): -0.3229180±0.0769508 mas/yr

Proper Motion (Dec): -1.9878700±0.0595033 mas/yr

Photometry: m_V
11.149±0.013; m_TESS
10.5593±0.0090; m_J
10.024±0.022; m_H
9.755±0.022; m_Ks
9.720±0.021; m_Kep
11.014; m_W1
9.685±0.021; m_W2
9.714±0.020; m_W3
9.721±0.047; m_W4
8.85; m_Gaia
10.948500±0.000567; m_B
11.751±0.190; m_g
11.3748000±0.0004857; m_i
10.9082000±0.0005113; m_r
11.00810±0.00063; m_u
14.7016000±0.0086614; m_z
13.0903000±0.0140154

Abundances (Hypatia Catalog): [Fe/H] 0.07±0.04 dex; [Mg/H] -0.01±0.07 dex

Mission: K2 : Observed in Campaigns 6, 17

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

Source	Howard et al. 2025	Smith et al. 2022	TICv8	Livingston et al. 2018	Gaia DR2	Mayo et al. 2018	Smith et al. 2017	Kruse et al. 2019	Petigura et al. 2018	Pope et al. 2016
T_eff (K)	6053.0±100.0	6069±92	6073.270+123.216-145.542	6217±78	5993.267+519.613-143.267	6033.0±50.0	5990±40	---	---	---
Metallicity (dex)	0.240±0.044 [Fe/H]	0.20±0.07 [Fe/H]	0.169±0.015 [M/H]	0.21±0.06 [Fe/H]	---	0.15±0.08 [Fe/H]	0.20±0.05 [Fe/H]	---	---	---
γ (km/s)	---	-2.855±0.005	---	---	-2.3325056379724565±0.6761083983927655	---	-2.08±0.01	---	---	---
v sin i (km/s)	9.40±1.00	---	---	---	---	---	9.3±0.5	---	---	---
Age (Gyr)	---	3.7±0.4	---	---	---	---	2.4+0.2-0.6	---	---	---
ρ_✶ (g/cm³)	---	---	0.0788922+0.0204643-0.0186438	0.0990+0.0320-0.0270	---	---	0.078±0.003	---	---	---
M_✶ (M_⦿)	1.48±0.12	1.44±0.03	1.140000+0.148079-0.165775	1.63±0.04	---	1.424556 +0.095378-0.107159	1.60+0.14-0.10	---	---	---
R_✶ (R_⦿)	2.66±0.11	2.55±0.02	2.73115+0.14840-0.16557	2.63±0.07	2.7093472+0.1343290-0.4150700	2.276457 +0.320083-0.257309	3.1±0.1	2.71 +0.42-0.13	1.98	---
log g (log₁₀(cm/s²))	3.90±0.08	3.783±0.004	3.6222800+0.0833961-0.0973954	3.81±0.02	---	3.78±0.1	3.67±0.04	---	---	---
Sp. T	---	---	---	---	---	---	G0 IV	---	---	---
L_✶ (log₁₀(L_⦿))	---	0.899+0.024-0.026	0.9610762+0.0309535-0.0244837	---	0.9310785+0.0146978-0.0152127	---	---	---	---	---
S Index	0.119	---	---	---	---	---	---	---	---	---
CAII LOG RHK	-5.393	---	---	---	---	---	---	---	---	---

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K2-99 b Planetary Parameters (8 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

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

Source	Smith et al. 2022	Howard et al. 2025	Livingston et al. 2018	Mayo et al. 2018	Smith et al. 2017	Kruse et al. 2019	Petigura et al. 2018	Pope et al. 2016
T_eq (K)	1184±19	1108.0+34.0-33.0	1113±21	---	---	---	---	---
S (S_⨁)	---	357.0+46.0-41.0	---	---	---	---	---	---
M_p (M_⨁)	277±6	287.0+23.0-22.0	---	---	308±29	---	---	---
M_p (M_Jup)	0.87±0.02	0.9030+0.0724-0.0692	---	---	0.970±0.090	---	---	---
P (days)	18.24783±0.00003	18.24901±0.00062	18.251985±0.001399	18.248708 +0.000634-0.000572	18.249±0.001	18.24841 +0.00053-0.00055	18.252213 +0.001438-0.001419	18.25
ρ (g/cm³)	---	0.900+0.150-0.130	---	---	---	---	---	---
R_p (R_⨁)	11.9±0.1	12.37+0.18-0.10	11.73±0.42	10.5358595501 +1.5095613911-1.20731555932	14.5±0.6	12.48 +1.95-0.87	8.3 +1.3-1.2	---
R_p (R_Jup)	1.06±0.01	1.104+0.016-0.009	1.046±0.037	0.939946431 +0.134674047-0.107709480	1.29±0.05	1.113 +0.174-0.078	0.74 +0.12-0.11	---
T_C (days)	2458182.7133±0.0005 (BJD-TDB)	2457233.8255±0.0012 (BJD)	2457233.82366+0.00255-0.00261 (BJD)	2457233.82597 +0.001104-0.001160	2457233.823±0.003 (BJD-TDB)	2457233.82582 +0.00098-0.00096 (BJD)	2457233.82485 +0.002602-0.002524 (BJD)	2457233.823 (BJD)
a/R_✶	13.1±0.1	---	12.01+0.87-1.69	11.418816 +1.289520-1.565156	11.1±0.1	11.1±1.4	---	---
i (deg)	88.6±0.2	---	---	87.632965 +1.633927-1.444101	87.7±0.3	---	---	---
R_p/R_✶	0.0426±0.0004	---	0.0408+0.0013-0.0007	0.042431 +0.001169-0.000800	0.0422±0.0006	0.0422 +0.0012-0.0021	0.0385 +0.0013-0.0007	0.042143
b	0.34±0.05	---	0.39+0.22-0.24	---	0.41±0.05	---	0.38 +0.23-0.25	0.343
ω (deg)	334±4	---	---	---	8.0±8.0	---	---	---
e	0.22±0.01	---	---	---	0.19±0.04	---	---	---
K (m/s)	54±1	---	---	---	56±4	---	---	---
a (au)	0.153±0.001	---	0.1597±0.0012	---	0.159±0.006	---	---	---
T₁₄ (hours)	11.1±0.2	---	---	---	12±0	11.49600+0.12000-0.14400	11.04960+0.16080-0.11040	10.86792
δ (%)	---	---	---	---	---	0.193±0.0017	---	0.1776

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K2-99 c Planetary Parameters (1 Solution)

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Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems; K2 Names

Source	Smith et al. 2022
T_p (days)	2458025.6±2.8 (BJD-TDB)
T_eq (K)	390±6
ω (deg)	13±2
M_p sin i (M_⨁)	2670±64
M_p sin i (M_Jup)	8.4±0.2
e	0.210±0.009
P (days)	522.2±1.4
K (m/s)	170±2
a (au)	1.43±0.01
T₁₄ (hours)	<33.6
T_C (days)	2458104.2±1.5 (BJD-TDB)

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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

Data Files: 2 K2 Time Series; 2 Associated Literature Data

Bibliography (13 References)

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Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant
Smith et al. 2022 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0-8
Kruse et al. 2019 Reference Overview
Sixty Validated Planets from K2 Campaigns 5-8
Livingston et al. 2018 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
Mayo et al. 2018 Reference Overview
Planet Candidates from K2 Campaigns 5─8 and Follow-up Optical Spectroscopy
Petigura et al. 2018 Reference Overview
K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
Smith et al. 2017 Reference Overview
Transiting exoplanet candidates from K2 Campaigns 5 and 6
Pope et al. 2016 Reference Overview
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

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
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Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/16/K2-99.json

Catalog Parameters

RA

ra

13h55m05.70s

Dec

dec

-05d26m32.98s

β

elat

5.9458

λ

elon

208.67834

b

glat

53.97598

l

glon

330.5855

m_V

sy_vmag

11.149±0.013

m_TESS

sy_tmag

10.5593±0.0090

m_J

sy_jmag

10.024±0.022

m_H

sy_hmag

9.755±0.022

m_Ks

sy_kmag

9.720±0.021

m_Kep

sy_kepmag

11.014

m_W1

sy_w1mag

9.685±0.021

m_W2

sy_w2mag

9.714±0.020

m_W3

sy_w3mag

9.721±0.047

m_W4

sy_w4mag

8.85

sy_icmag

no_data

m_Gaia

sy_gaiamag

10.948500±0.000567

m_B

sy_bmag

11.751±0.190

m_g

sy_gmag

11.3748000±0.0004857

m_i

sy_imag

10.9082000±0.0005113

m_r

sy_rmag

11.00810±0.00063

m_u

sy_umag

14.7016000±0.0086614

m_z

sy_zmag

13.0903000±0.0140154

μ

sy_pm

2.0139273±0.0600154

μ_δ

sy_pmdec

-1.9878700±0.0595033

μ_α

sy_pmra

-0.3229180±0.0769508

π

sy_plx

1.8983600±0.0466995

Distance

sy_dist

519.229+12.998-12.389

Set Parameters

R_✶

st_rad

3.1±0.1

T_eff

st_teff

5990±40

K2-99 Overview

K2-99 Architecture & Discovery Information

K2-99