K2-280 | NASA Exoplanet Archive

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-280
K2-280 b	19.9 d	7.5 R_⨁	Transit	2018	Livingston et al. 2018	Confirmed Planet

K2-280 Stellar Parameters (8 Solutions)

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RA: 19h26m22.89s

Dec: -22d14m51.75s

Distance: 391.537+7.494-7.223
pc

Parallax: 2.5266300±0.0476123 mas

Ecliptic Latitude: -.2892 deg

Ecliptic Longitude: 289.91288 deg

Galactic Latitude: -17.32247 deg

Galactic Longitude: 16.32379 deg

Total Proper Motion: 13.2692359±0.0667622 mas/yr

Proper Motion (RA): 4.4421400±0.0788832 mas/yr

Proper Motion (Dec): -12.5036000±0.0650721 mas/yr

Photometry: m_V
12.524±0.080; m_TESS
11.8657±0.0061; m_J
11.141±0.021; m_H
10.854±0.024; m_Ks
10.765±0.019; m_Kep
12.302; m_W1
10.726±0.023; m_W2
10.779±0.021; m_W3
10.537±0.122; m_W4
8.579001; m_Gaia
12.360400±0.000193; m_B
13.269±0.006

Abundances (Hypatia Catalog): [Fe/H] 0.28±0.03 dex; [C/H] 0.29±0.03 dex; [O/H] 0.18±0.09 dex; [Na/H] 0.27±0.04 dex; [Mg/H] 0.41±0.07 dex; [Al/H] 0.37±0.06 dex; [Ca/H] 0.33±0.06 dex; [BaII/H] 0.24±0.19 dex

Mission: K2 : Observed in Campaign 7

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	Nowak et al. 2020	TICv8	Livingston et al. 2018	Gaia DR2	Kruse et al. 2019	Mayo et al. 2018	Petigura et al. 2018
T_eff (K)	5741.0±100.0	5500±100	5556.000+164.538-112.270	5742±90	5351.0+131.5-87.0	---	5767.0±50.0	---
L_✶ (log₁₀(L_⦿))	---	---	0.16842323+0.02234521-0.02859837	---	0.13976099+0.01124454-0.01154340	---	---	---
γ (km/s)	---	---	---	---	-0.14744915061274355±1.59445624250222107	---	---	---
R_✶ (R_⦿)	1.279±0.052	1.28±0.07	1.3102100+0.0782332-0.0604100	1.28±0.03	1.3666687+0.0455482-0.0647739	1.367 +0.065-0.046	1.064140 +0.069371-0.046771	1.45
Metallicity (dex)	0.353±0.060 [Fe/H]	0.33±0.08 [Fe/H]	---	0.30±0.05 [Fe/H]	---	---	0.44±0.08 [Fe/H]	---
ρ_✶ (g/cm³)	---	0.80+0.16-0.13	0.6136621+0.1748805-0.1016145	0.259+0.086-0.070	---	---	---	---
M_✶ (M_⦿)	1.17±0.09	1.03±0.03	0.9790000+0.1189560-0.1308190	1.11±0.04	---	---	---	---
log g (log₁₀(cm/s²))	4.14±0.10	4.21±0.05	4.1941700+0.0860460-0.0775125	4.26±0.03	---	---	4.47±0.1	---
v sin i (km/s)	2.5±1.0	3.0±1.0	---	---	---	---	---	---
Age (Gyr)	---	8.960±1.700	---	---	---	---	---	---
S Index	0.127	---	---	---	---	---	---	---
CAII LOG RHK	-5.273	---	---	---	---	---	---	---

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K2-280 b Planetary Parameters (6 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	Nowak et al. 2020	Howard et al. 2025	Livingston et al. 2018	Kruse et al. 2019	Mayo et al. 2018	Petigura et al. 2018
b	0.27+0.16-0.17	---	0.45+0.17-0.24	---	---	0.37 +0.19-0.25
P (days)	19.89526±0.00028	19.89500±0.00035	19.895202+0.000774-0.000753	19.89531 +0.00028-0.00027	19.894641 +0.002717-0.002898	19.895268 +0.000676-0.000686
R_p (R_⨁)	7.50±0.44	7.46+0.11-0.05	7.67±0.26	8.01 +0.39-0.37	5.55493873974 +0.447637132962-0.330177735587	8.5 +1.2-1.0
R_p (R_Jup)	0.669±0.039	0.666+0.010-0.004	0.684±0.023	0.715 +0.035-0.033	0.50 +0.04-0.03	0.76 +0.11-0.09
R_p/R_✶	0.05354+0.00094-0.00056	---	0.0547+0.0017-0.0011	0.05374 +0.00070-0.00168	0.047857 +0.002267-0.001915	0.0537 +0.0014-0.0008
T₁₄ (hours)	8.267+0.063-0.054	---	---	8.27760+0.05280-0.06000	---	8.18880+0.12000-0.06960
T_C (days)	2457307.58114±0.00056 (BJD-TDB)	2457327.47611±0.00046 (BJD)	2457327.47592+0.00099-0.00100 (BJD)	2457307.58121 +0.00052-0.00054 (BJD)	2457307.58339 +0.005997-0.005575 (BJD)	2457327.47573 +0.000940-0.000912 (BJD)
a/R_✶	25.79+0.87-0.90	---	17.56+1.59-1.99	18.88 +1.11-0.48	17.474504 +1.733386-3.730135	---
i (deg)	89.53+0.30-0.26	---	---	---	88.588442 +1.001116-1.545009	---
T_eq (K)	787±17	736.0±22.0	744±15	---	---	---
a (au)	0.1461+0.0099-0.0097	---	0.1488+0.0019-0.0020	---	---	---
S (S_⨁)	---	69.5+8.6-7.9	---	---	---	---
M_p (M_⨁)	37.1±5.6	49.0+6.5-6.2	---	---	---	---
M_p (M_Jup)	0.117±0.018	0.154+0.020-0.020	---	---	---	---
ρ (g/cm³)	0.48+0.13-0.10	0.64+0.13-0.11	---	---	---	---
δ (%)	---	---	---	0.3463±0.002	---	---
T_p (days)	2457315.06+0.38-0.44 (BJD-TDB)	---	---	---	---	---
ω (deg)	246.77+4.54-5.28	---	---	---	---	---
e	0.35+0.05-0.04	---	---	---	---	---
K (m/s)	9.180±1.270	---	---	---	---	---

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 1 K2 Targets; 3 2MASS Point Source Catalog

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

Bibliography (11 References)

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Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
K2-280 b - a low density warm sub-Saturn around a mildly evolved star
Nowak et al. 2020 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
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
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Transit Prediction Service
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