K2-55 | NASA Exoplanet Archive

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-55
K2-55 b	2.85 d	4.43 R_⨁	Transit	2016	Crossfield et al. 2016	Confirmed Planet

Exoplanet Archive Notes (1)

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K2-55 b

Typo in Table 2; transit durations mis-reported in hours. See literature discrepancies page. (Schmitt et al. 2016)

K2-55 Stellar Parameters (10 Solutions)

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RA: 22h15m00.45s

Dec: -17d15m02.88s

Distance: 159.522+0.730-0.725
pc

Parallax: 6.2399700±0.0283716 mas

Ecliptic Latitude: -5.97399 deg

Ecliptic Longitude: 329.44981 deg

Galactic Latitude: -52.6322 deg

Galactic Longitude: 39.9332 deg

Total Proper Motion: 25.4305141±0.0479488 mas/yr

Proper Motion (RA): -12.5895000±0.0492434 mas/yr

Proper Motion (Dec): -22.095600±0.047521 mas/yr

Photometry: m_V
13.519±0.092; m_TESS
12.3071±0.0061; m_J
11.230±0.023; m_H
10.615±0.024; m_Ks
10.471±0.025; m_Kep
13.087; m_W1
10.424±0.023; m_W2
10.497±0.022; m_W3
10.302±0.082; m_W4
8.372; m_Gaia
13.062400±0.000386; m_B
14.814±0.058

Mission: K2 : Observed in Campaign 3

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	Gaia DR2	Dressing et al. 2017	Crossfield et al. 2016	Kruse et al. 2019	ExoFOP	Barros et al. 2016	Schmitt et al. 2016	Vanderburg et al. 2016
T_eff (K)	4300+107-100	4279.000+152.758-108.647	4422.000+153.333-133.050	4299.981934+106.617569-100.011025	4456±148	---	4279.0±130.7	---	---	4237
M_✶ (M_⦿)	0.688±0.069	0.6690000+0.0940336-0.0704583	---	0.687725±0.068773	0.696±0.047	---	---	---	---	---
R_✶ (R_⦿)	0.715+0.043-0.040	0.7375760+0.0638839-0.0733925	0.6622259+0.0417238-0.0436427	0.715385+0.042897-0.039639	0.630±0.050	0.662 +0.044-0.042	0.74±0.07	---	---	0.65
log g (log₁₀(cm/s²))	4.566±0.036	4.527880+0.105698-0.112480	---	---	4.673±0.050	---	4.53±0.11	---	---	---
L_✶ (log₁₀(L_⦿))	---	-0.7843223+0.0278259-0.0311226	-0.82081800+0.00461495-0.00466451	---	---	---	---	---	---	---
γ (km/s)	---	---	3.9533145671483467±1.1681925247808098	---	---	---	---	---	---	---
ρ_✶ (g/cm³)	---	2.3505611+0.7903303-0.7357559	---	---	---	---	---	---	---	---
Metallicity (dex)	0.376±0.095 [Fe/H]	---	---	---	---	---	---	---	---	---
v sin i (km/s)	2.2±1.0	---	---	---	---	---	---	---	---	---
S Index	0.78	---	---	---	---	---	---	---	---	---
CAII LOG RHK	-4.7339	---	---	---	---	---	---	---	---	---

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K2-55 b Planetary Parameters (9 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

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

Source	Howard et al. 2025	Kokori et al. 2023	Dressing et al. 2017	Crossfield et al. 2016	Kruse et al. 2019	ExoFOP	Barros et al. 2016	Schmitt et al. 2016	Vanderburg et al. 2016
b	---	---	---	---	---	---	---	0.14 +0.49-0.61	0.55
P (days)	2.849271±0.000029	2.8492816±0.0000018	2.849274±0.000027	2.849258±0.000033	2.849302±0.000019	2.8492802255418863±0.0000065531362000	2.84947127	2.8493 +0.0013-0.0015	2.8492818
R_p (R_⨁)	4.43+0.29-0.32	---	4.38+0.29-0.25	3.82±0.32	4.07 +0.30-0.41	4.680228335918303±1.476745200000000	---	---	4.43
R_p (R_Jup)	0.395+0.026-0.029	---	0.391+0.026-0.022	0.341±0.029	0.363 +0.03-0.037	0.4175427241049940±0.1317466092166614	---	---	0.395
R_p/R_✶	---	0.0561±0.0016	0.056128+0.001592-0.000978	0.0552±0.0013	0.0563 +0.0018-0.0044	---	---	0.0574 +0.0032-0.0019	0.05814
δ (%)	---	---	---	---	0.3954 +0.0031-0.0032	0.388158442872642±0.024150882000000	0.372±0.005	---	0.389
T₁₄ (hours)	---	---	---	2.006±0.022	2.06160+0.02640-0.03600	2.0072154631244645±0.3230903000000000	2.09300+0.06000-0.06000	1.87200+0.02400-0.04800	2.07000
T_C (days)	2456983.4229±0.0004 (BJD)	2457063.20281±0.00024 (BJD-TDB)	2456983.423±0.000 (BJD)	2456983.42298±0.00040 (BJD-TDB)	2456977.72404±0.00026 (BJD)	2459448.05066000±0.00110949 (BJD)	2456983.419498 (BJD)	2456983.4245±0.0008 (BJD)	2456980.574 (BJD)
a/R_✶	---	10.5±0.6	10.46+0.58-0.62	---	10.56 +1.56-0.60	---	---	10.1 +1.8-1.6	---
S (S_⨁)	141.3+28.8-23.5	---	141.3+28.8-23.5	115±24	---	137.92768952988848	---	---	---
ω (deg)	---	23.90+115.40-140.30	23.9400000+115.4329290-140.3255640	---	---	---	---	---	---
e	---	0.070+0.130-0.060	0.0700000+0.1316750-0.0612860	---	---	---	---	---	---
i (deg)	---	88.2+1.1-1.0	88.21+1.14-1.00	---	---	---	---	87.5 +1.7-2.0	---
a (au)	---	---	0.035±0.001	0.03486±0.00078	---	---	---	---	---
T_eq (K)	900.0	---	---	---	---	874.0426294544562	---	---	---
M_p (M_⨁)	44.0±5.3	---	---	---	---	---	---	---	---
M_p (M_Jup)	0.138±0.017	---	---	---	---	---	---	---	---
ρ (g/cm³)	2.8+0.7-0.6	---	---	---	---	---	---	---	---

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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

Data Files: 1 K2 Time Series; 1 Associated Literature Data

Bibliography (14 References)

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Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
Kokori et al. 2023 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
Gaia Data Release 2
Gaia DR2 Reference Overview
Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. II. Planetary Systems Observed During Campaigns 1-7
Dressing et al. 2017 Reference Overview
ExoFOP TOI Table
ExoFOP
New planetary and eclipsing binary candidates from campaigns 1-6 of the K2 mission
Barros et al. 2016 Reference Overview
197 Candidates and 104 Validated Planets in K2’s First Five Fields
Crossfield et al. 2016 Reference Overview
Planet Hunters. X. Searching for Nearby Neighbors of 75 Planet and Eclipsing Binary Candidates from the K2 Kepler extended mission
Schmitt 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
Planetary Candidates from the First Year of the K2 Mission
Vanderburg et al. 2016 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
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Time Series
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K2-55 Overview

K2-55 Architecture & Discovery Information