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TRAPPIST-1 Overview

TRAPPIST-1 0.11 R⦿ 5780.00 K
TRAPPIST-1 b
0.100 RJup
TRAPPIST-1 c
0.098 RJup
TRAPPIST-1 d
0.070 RJup
TRAPPIST-1 e
0.082 RJup
TRAPPIST-1 f
0.093 RJup
TRAPPIST-1 g
0.101 RJup
TRAPPIST-1 h
0.067 RJup

TRAPPIST-1 Architecture & Discovery Information

Name Orbital Separation Planet Size Method Year Reference Disposition
TRAPPIST-1
TRAPPIST-1 b 1.51 d 1.12 R⨁ Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 c 2.42 d 1.1 R⨁ Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 d 4.05 d 0.79 R⨁ Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 e 6.1 d 0.92 R⨁ Transit 2017 Gillon et al. 2017 Confirmed Planet
TRAPPIST-1 f 9.21 d 1.05 R⨁ Transit 2017 Gillon et al. 2017 Confirmed Planet
TRAPPIST-1 g 12.35 d 1.13 R⨁ Transit 2017 Gillon et al. 2017 Confirmed Planet
TRAPPIST-1 h 18.77 d 0.76 R⨁ Transit 2017 Gillon et al. 2017 Confirmed Planet
TRAPPIST-1
  • Original planet parameters for planet 'd' retracted by Gillon et al. (2017) owing to incorrect period. (Gillon et al. 2016)
TRAPPIST-1 d
  • Omitted semi-major axis, irradiation, equilibrium temperature, ratio of distance to stellar radius (ranges of discrete values given for set of possible periods). See Table 1 of ref. (Gillon et al. 2016)
  • Original planet parameters for planet 'd' retracted by Gillon et al. (2017) owing to incorrect period. (Gillon et al. 2017)
RA
23h06m30.33s
Dec
-05d02m36.46s
Distance
---
Parallax
---
Ecliptic Latitude
.62982 deg
Ecliptic Longitude
345.73298 deg
Galactic Latitude
-56.64891 deg
Galactic Longitude
69.71519 deg
Total Proper Motion
1026.5792712±8.0000000 mas/yr
Proper Motion (RA)
901.0±8.0 mas/yr
Proper Motion (Dec)
-492.0±8.0 mas/yr
Photometry
mV
17.02±0.20
mTESS
13.8529000±0.0112926
mJ
11.354±0.022
mH
10.718±0.021
mKs
10.296±0.023
mKep
12.917
mIc
14.0±0.1
mGaia
15.645100±0.001448
mg
19.6235000±0.0155229
mi
15.092300±0.004339
mr
17.996300±0.007352
mu
23.305600±0.803622
mz
13.4342000±0.0040633
Mission
K2 : Observed in Campaign 12
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 Piaulet-Ghorayeb et al. 2025 Agol et al. 2021 Ducrot et al. 2020 Hirano et al. 2020 TICv8 Gaia DR2 Grimm et al. 2018 Gillon et al. 2017 Gillon et al. 2016 ExoFOP
v sin i
(km/s)
--- --- ---
2.04+0.18-0.16
 --- --- --- --- --- ---
Teff
(K)
2566±26 2566±26 2520±39 --- ---
3352.3333+103.6670-61.8333
 --- 2559±50 2550±55 5780
R✶
(R⦿)
0.1192±0.0013 0.1192±0.0013 0.1234±0.0033 --- 0.1148270±0.0033573 --- --- 0.1170±0.0036 0.117±0.004 0.114826999604702±0.003357280000000
log g
(log10(cm/s2))
5.2396+0.0056-0.0073
5.2396+0.0056-0.0073
 --- --- 5.2759600±0.0719093 --- --- --- --- 5.2759600±0.0719093
L✶
(log10(L⦿))
-3.26+0.01-0.02
-3.26+0.01-0.02
-3.26+0.01-0.01
 --- --- --- ---
-3.28+0.03-0.03
-3.28+0.03-0.03
 ---
Metallicity
(dex)
0.0520±0.0730 [Fe/H] --- 0.05350±0.08800 [Fe/H] --- --- --- --- 0.040±0.080 [Fe/H] 0.040±0.080 [Fe/H] ---
Age
(Gyr)
7.6±2.2 --- --- --- --- --- --- --- >0.5 ---
M✶
(M⦿)
0.0898±0.0023 0.0898±0.0023 0.0898±0.0023 --- 0.09077820±0.02000690 --- 0.089±0.007 0.0802±0.0073 0.080±0.009 ---
Sp. T
M8.0 V --- --- --- --- --- --- --- --- ---
Prot
(days)
3.30±0.14 --- --- --- --- --- --- --- 1.40±0.05 ---
ρ✶
(g/cm3)
---
75.05+1.02-1.66
 67.64±5.50 --- 84.5307882±11.2901428 --- ---
71.5+1.7-3.1
70.9+8.0-4.6
 ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
TOI
K2 Names
K2 Planets and Candidates
Transit
NExoList: JWST
Atmospheric Spectroscopy
Source Agol et al. 2021 Rathcke et al. 2025 Ducrot et al. 2020 Hirano et al. 2020 Grimm et al. 2018 Gillon et al. 2017 de Wit et al. 2016 Gillon et al. 2016 ExoFOP
a/R✶
20.843+0.094-0.155
20.802+0.052-0.078
20.13+0.46-0.55
 --- ---
20.50+0.16-0.31
 ---
20.45+0.43-0.81
 ---
Teq
(K)
--- --- 397.6±3.8 --- --- 400.1±7.7 366 400±9 802.860220389002
b
0.0950+0.0650-0.0610
 ---
0.254+0.110-0.085
 --- ---
0.126+0.092-0.078
 --- 0.21±0.14 ---
S
(S⨁)
4.153+0.161-0.159
 --- 4.15±0.16 --- --- 4.25±0.33 --- 4.25±0.38 98.1930529305747
i
(deg)
89.728±0.165
89.80+0.14-0.12
 89.28±0.32 --- ---
89.65+0.22-0.27
 89.39±0.32 89.41±0.41 ---
P
(days)
1.510826±0.000006 1.5108261±0.0000058 1.51088432±0.00000015
1.51087+0.00022-0.00017
 --- 1.51087081±0.00000060 --- 1.510848±0.000019 1.51094471179194±0.00012604707000
a
(au)
0.01154±0.00010 ---
0.011534+0.000099-0.000092
 --- 0.011547750±0.000000057 0.01111±0.00034 --- 0.01111±0.00040 ---
T14
(hours)
0.6010±0.0018 --- 0.60515±0.00155 --- --- 0.6067±0.0028 0.6020±0.0077 0.6020±0.0077 0.640149871039871±0.125401200000000
TC
(days)
---
2460501.405464+0.000010-0.000011
(BJD-TDB)
2457322.514193±0.000003
(BJD-TDB)
2458362.0021+0.0016-0.0022
(BJD-TDB)
--- 2457322.51736±0.00010
(BJD-TDB)
2457512.88646±0.00030
(BJD)
2457322.51765±0.00025
(BJD-TDB)
2460209.80835200±0.00109332
(BJD)
e
--- 0 --- --- 0.00622±0.00304 <0.081 --- 0 ---
Rp
(R⨁)
1.116+0.014-0.012
 --- --- ---
1.121+0.031-0.032
 1.086±0.035 --- 1.113±0.044 1.20389171822242±0.23403676000000
Rp
(RJup)
0.09956+0.00125-0.00107
 --- --- ---
0.1000+0.0028-0.0029
 0.09689±0.00312 --- 0.09930±0.00393 0.107404210110061±0.020879397178371
δ
(%)
0.7378±0.0064 --- --- --- --- 0.7266±0.0088 0.8015±0.0220 0.754±0.025 1.06934881603416±0.11801766000000
Mp
(M⨁)
1.374±0.069 --- --- ---
1.017+0.154-0.143
 0.850±0.720 --- --- ---
Mp
(MJup)
0.004323±0.000217 --- --- ---
0.003200+0.000485-0.000450
 0.00267±0.00227 --- --- ---
ρ
(g/cm3)
5.442+0.265-0.276
 --- --- ---
4.00+0.51-0.50
 3.6±3.1 --- --- ---
Rp/R✶
0.08590±0.00037
0.08507+0.00016-0.00017
 --- --- --- --- --- --- ---
ω
(deg)
--- 90 --- --- 336.86±34.24 --- --- --- ---
λ
(deg)
--- --- ---
15+26-30
 --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
NExoList: JWST
Atmospheric Spectroscopy
Source Agol et al. 2021 Rathcke et al. 2025 Ducrot et al. 2020 Grimm et al. 2018 Gillon et al. 2017 de Wit et al. 2016 Gillon et al. 2016
a/R✶
28.549+0.129-0.212
28.422+0.073-0.111
27.57+0.62-0.76
 ---
28.08+0.22-0.42
 ---
28.0+0.6-1.1
Teq
(K)
--- --- 339.7±3.3 --- 341.9±6.6 315 342±8
b
0.109+0.059-0.061
 ---
0.254+0.110-0.087
 ---
0.161+0.076-0.084
 --- 0.25±0.15
S
(S⨁)
2.214+0.086-0.085
 --- 2.211±0.085 --- 2.27±0.18 --- 2.26±0.21
i
(deg)
89.778±0.118
89.83761834+0.09000000-0.08000000
 89.47±0.24 --- 89.67±0.17 89.58±0.11 89.50±0.31
P
(days)
2.421937±0.000018
2.4219371+0.0000180-0.0000179
 2.42179346±0.00000023 --- 2.4218233±0.0000017 --- 2.421848±0.000028
a
(au)
0.01580±0.00013 ---
0.01579+0.00014-0.00013
 0.01581512±0.00000015 0.01521±0.00047 --- 0.01522±0.00055
T14
(hours)
0.7005±0.0022 --- 0.707±0.002 --- 0.7062±0.0037 0.6963±0.0135 0.6963±0.0135
TC
(days)
---
2460501.385348+0.000011-0.000012
(BJD-TDB)
2457282.8113871±0.0000038
(BJD-TDB)
--- 2457282.80728±0.00019
(BJD-TDB)
2457512.88019±0.00016
(BJD)
2457362.72618±0.00033
(BJD-TDB)
e
--- 0 --- 0.00654±0.00188 <0.083 --- 0
Rp
(R⨁)
1.097+0.014-0.012
 --- ---
1.095+0.030-0.031
 1.056±0.035 --- 1.049±0.050
Rp
(RJup)
0.09787+0.00125-0.00107
 --- ---
0.09769+0.00268-0.00277
 0.09421±0.00312 --- 0.09359±0.00446
δ
(%)
0.7123±0.0064 --- --- --- 0.687±0.010 0.7290±0.0240 0.672±0.042
Mp
(M⨁)
1.308±0.056 --- ---
1.156+0.142-0.131
 1.38±0.61 --- ---
Mp
(MJup)
0.004115±0.000176 --- ---
0.003637+0.000447-0.000412
 0.00434±0.00192 --- ---
ρ
(g/cm3)
5.464+0.221-0.237
 --- ---
4.87+0.46-0.43
 6.45±2.92 --- ---
Rp/R✶
0.08440±0.00038
0.08453+0.00016-0.00017
 --- --- --- --- ---
ω
(deg)
--- 90 --- 282.45±17.10 --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Atmospheric Spectroscopy
Source Agol et al. 2021 Piaulet-Ghorayeb et al. 2025 Ducrot et al. 2020 Grimm et al. 2018 Gillon et al. 2017
a/R✶
40.216+0.182-0.299
 40.15±0.18
38.85+0.88-1.10
 ---
39.55+0.30-0.59
Teq
(K)
--- 286±3 286.2±2.8 --- 288.0±5.6
b
0.0630+0.0630-0.0430
 0.060±0.050
0.235+0.120-0.094
 --- 0.17±0.11
S
(S⨁)
1.115±0.043
1.119+0.047-0.044
 1.114±0.043 --- 1.143±0.088
i
(deg)
89.896±0.077
89.909+0.068-0.071
 89.65±0.15 --- 89.75±0.16
P
(days)
4.049219±0.000026 4.049219±0.000026 4.04978035±0.00000266 --- 4.049610±0.000063
a
(au)
0.02227±0.00019 0.0223±0.0003
0.02226+0.00019-0.00018
 0.02228038±0.00000044
0.02144+0.00066-0.00063
T14
(hours)
0.8145±0.0040 --- 0.8228±0.0053 --- 0.8188±0.0110
TC
(days)
--- --- 2457670.1463014±0.0000184
(BJD-TDB)
--- 2457670.14165±0.00035
(BJD-TDB)
Mp
(M⨁)
0.388±0.012 0.388±0.012 ---
0.297+0.039-0.035
 0.41±0.27
Mp
(MJup)
0.00122±0.00004 0.00122±0.00004 ---
0.000934+0.000123-0.000110
 0.0013±0.0008
ρ
(g/cm3)
4.37+0.15-0.17
 --- ---
3.40+0.37-0.34
 4.9±3.3
Rp
(R⨁)
0.788+0.011-0.010
0.804+0.014-0.012
 --- 0.784±0.023 0.772±0.030
Rp
(RJup)
0.0703+0.0010-0.0009
0.0717+0.0012-0.0011
 --- 0.0699±0.0021 0.0689±0.0027
Rp/R✶
0.06063±0.00052 --- --- --- ---
δ
(%)
0.3676±0.0063 --- --- --- 0.367±0.017
ω
(deg)
--- --- --- -8.73±6.17 ---
e
--- --- --- 0.00837±0.00093 <0.070
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
NExoList: JWST
Atmospheric Spectroscopy
Source Agol et al. 2021 Ducrot et al. 2020 Hirano et al. 2020 Grimm et al. 2018 Gillon et al. 2017
a/R✶
52.855+0.239-0.392
51.0+1.2-1.4
 --- ---
51.97+0.40-0.77
Teq
(K)
--- 249.7±2.4 --- --- 251.3±4.9
b
0.191±0.041
0.299+0.085-0.072
 --- ---
0.12+0.11-0.09
S
(S⨁)
0.646±0.025 0.645±0.025 --- --- 0.662±0.051
i
(deg)
89.793±0.048 89.663±0.092 --- ---
89.86+0.10-0.12
P
(days)
6.101013±0.000035 6.09956479±0.00000178
6.09705+0.00096-0.00093
 --- 6.099615±0.000011
a
(au)
0.02925±0.00250
0.02924+0.00025-0.00023
 --- 0.02928285±0.00000034
0.02817+0.00083-0.00087
T14
(hours)
0.9293±0.0043 0.9385±0.0042 --- --- 0.9535±0.0120
TC
(days)
--- 2457660.3676621±0.0000143
(BJD-TDB)
2458361.8113+0.0028-0.0025
(BJD-TDB)
--- 2457660.37859±0.00038
(BJD-TDB)
Mp
(M⨁)
0.692±0.022 --- ---
0.772+0.079-0.075
 0.62±0.58
Mp
(MJup)
0.00218±0.00007 --- ---
0.00243+0.00025-0.00024
 0.0020±0.0018
ρ
(g/cm3)
4.90+0.17-0.18
 --- ---
5.646+0.419-0.386
 4.4±4.2
Rp
(R⨁)
0.920+0.013-0.012
 --- ---
0.910+0.026-0.027
 0.918±0.039
Rp
(RJup)
0.0821+0.0012-0.0011
 --- ---
0.0812+0.0023-0.0024
 0.0819±0.0035
Rp/R✶
0.07079±0.00055 --- --- --- ---
δ
(%)
0.5012±0.0078 --- --- --- 0.519±0.026
ω
(deg)
--- --- --- 108.37±8.47 ---
e
--- --- --- 0.00510±0.00058 <0.085
λ
(deg)
--- ---
9.0+45.0-51.0
 --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Source Agol et al. 2021 Ducrot et al. 2020 Hirano et al. 2020 Grimm et al. 2018 Gillon et al. 2017
a/R✶
69.543+0.314-0.516
67.10+1.15-1.90
 --- ---
68.4+0.5-1.0
Teq
(K)
--- 217.7±2.1 --- --- 219.0±4.2
b
0.312+0.023-0.018
 0.391±0.056 --- --- 0.382±0.035
S
(S⨁)
0.373+0.015-0.014
 0.373±0.014 --- --- 0.382±0.030
i
(deg)
89.740±0.019 89.666±0.059 --- --- 89.680±0.034
P
(days)
9.207540±0.000032 9.20659399±0.00000212 9.2129±0.0010 --- 9.206690±0.000015
a
(au)
0.03849±0.00033
0.038774+0.000330-0.000310
 --- 0.03853361±0.00000048 0.0371±0.0011
T14
(hours)
1.0480±0.0042 1.055±0.005 --- --- 1.043±0.010
TC
(days)
--- 2457671.3737299±0.0000157
(BJD-TDB)
2458361.8545±0.0018
(BJD-TDB)
--- 2457671.39767±0.00023
(BJD-TDB)
Mp
(M⨁)
1.039±0.031 --- ---
0.9340+0.0800-0.0780
 0.68±0.18
Mp
(MJup)
0.003269±0.000098 --- ---
0.002939+0.000252-0.000245
 0.0021±0.0006
ρ
(g/cm3)
5.02+0.14-0.16
 --- ---
4.50+0.21-0.20
 3.30±0.94
Rp
(R⨁)
1.045+0.013-0.012
 --- ---
1.046+0.029-0.030
 1.045±0.038
Rp
(RJup)
0.09323+0.00116-0.00107
 --- ---
0.09332+0.00259-0.00268
 0.09323±0.00339
Rp/R✶
0.08040±0.00047 --- --- --- ---
δ
(%)
0.6465±0.0076 --- --- --- 0.673±0.023
ω
(deg)
--- --- --- 368.81±3.11 ---
e
--- --- --- 0.01007±0.00068 <0.063
λ
(deg)
--- --- 21±32 --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
NExoList: JWST
Atmospheric Spectroscopy
Source Agol et al. 2021 Ducrot et al. 2020 Grimm et al. 2018 Gillon et al. 2017
ω
(deg)
--- --- 191.34±13.83 ---
Mp
(M⨁)
1.321±0.038 ---
1.148+0.098-0.095
 1.34±0.88
Mp
(MJup)
0.004156±0.000120 ---
0.003612+0.000308-0.000299
 0.00422±0.00277
e
--- --- 0.00208±0.00058 <0.061
ρ
(g/cm3)
5.06+0.14-0.16
 ---
4.18+0.19-0.18
 5.2±3.5
Rp
(R⨁)
1.129+0.015-0.013
 ---
1.148+0.032-0.033
 1.127±0.041
Rp
(RJup)
0.1007+0.0013-0.0012
 ---
0.1024+0.0029-0.0029
 0.1005±0.0037
a
(au)
0.04683±0.00040
0.04681528+0.00040000-0.00037000
 0.04687692±0.00000032 0.0451±0.0014
a/R✶
84.591+0.382-0.628
81.7+1.8-2.3
 ---
83.2+0.6-1.2
Teq
(K)
--- 197.3±1.9 --- 198.6±3.8
b
0.379+0.018-0.014
 0.430±0.049 --- 0.421±0.031
S
(S⨁)
0.252±0.010 0.2520±0.0097 --- 0.258±0.020
i
(deg)
89.742±0.012 89.698±0.044 --- 89.710±0.025
P
(days)
12.352446±0.000054 12.35355570±0.00000341 --- 12.35294±0.00012
T14
(hours)
1.1370±0.0047 1.152±0.006 --- 1.140±0.011
TC
(days)
--- 2457665.3628439±0.0000206
(BJD-TDB)
--- 2457665.34937±0.00021
(BJD-TDB)
δ
(%)
0.7555±0.0092 --- --- 0.782±0.027
Rp/R✶
0.08692±0.00053 --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Planetary Systems
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
NExoList: JWST
Atmospheric Spectroscopy
Source Agol et al. 2021 Ducrot et al. 2020 Grimm et al. 2018 Luger et al. 2017 Gillon et al. 2017
a/R✶
111.817+0.505-0.830
107.9+2.4-3.0
 --- 109±4
117+50-26
Teq
(K)
--- 171.7±1.7 --- 173±4
168+21-28
b
0.378+0.024-0.023
 0.448±0.054 ---
0.45+0.06-0.08
0.45+0.22-0.29
S
(S⨁)
0.144±0.006 0.1440±0.0055 --- 0.165±0.025
0.131+0.081-0.067
i
(deg)
89.805±0.013 89.763±0.037 ---
89.76+0.05-0.04
89.80+0.10-0.05
P
(days)
18.772866±0.000214 18.76727450±0.00001876 ---
18.767+0.004-0.003
20+15-6
a
(au)
0.06189±0.00053
0.0618656+0.0005300-0.0004900
 0.06193488±0.00000080 ---
0.063+0.027-0.013
T14
(hours)
1.2690±0.0093 1.271±0.014 --- 1.26±0.02
1.280+0.045-0.033
TC
(days)
--- 2457662.5741486±0.0000913
(BJD-TDB)
--- 2457662.55284±0.00037
(BJD-TDB)
2457662.55463±0.00056
(BJD-TDB)
Mp
(M⨁)
0.326±0.020 ---
0.331+0.056-0.049
 --- ---
Mp
(MJup)
0.00103±0.00006 ---
0.00104+0.00018-0.00015
 --- ---
ρ
(g/cm3)
4.16+0.33-0.30
 ---
3.96+0.65-0.56
 --- ---
Rp
(R⨁)
0.755±0.014 ---
0.773+0.026-0.027
0.752+0.032-0.031
 0.755±0.034
Rp
(RJup)
0.0674±0.0012 ---
0.0690+0.0023-0.0024
0.0671+0.0029-0.0028
 0.0674±0.0030
Rp/R✶
0.05809±0.00087 --- --- 0.0588±0.0016 ---
δ
(%)
0.3375±0.0101 --- --- 0.346±0.018 0.3520±0.0326
ω
(deg)
--- --- 338.92±9.66 --- ---
e
--- --- 0.00567±0.00121 --- ---
Print
Known Objects
7 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
7 Associated Literature Data
  • System
  • Star
  • Confirmed
  • Candidate
  • False Positive Planet
  • Controversial
  • False Positive
  • Aliases
  • Data Access
  • Transit Prediction Service
  • Time Series
  • Kepler | K2
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