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TRAPPIST-1 Overview

  • Star: TRAPPIST-1
    • Stellar Radius: 0.11 Solar Radius
    • Stellar Effective Temperature: 3352.33 K
    • Planet: TRAPPIST-1 b
      • Disposition Confirmed
      • Planet Radius 0.100 Jupiter Radius
    • Planet: TRAPPIST-1 c
      • Disposition Confirmed
      • Planet Radius 0.098 Jupiter Radius
    • Planet: TRAPPIST-1 d
      • Disposition Confirmed
      • Planet Radius 0.070 Jupiter Radius
    • Planet: TRAPPIST-1 e
      • Disposition Confirmed
      • Planet Radius 0.082 Jupiter Radius
    • Planet: TRAPPIST-1 f
      • Disposition Confirmed
      • Planet Radius 0.093 Jupiter Radius
    • Planet: TRAPPIST-1 g
      • Disposition Confirmed
      • Planet Radius 0.101 Jupiter Radius
    • Planet: TRAPPIST-1 h
      • Disposition Confirmed
      • Planet Radius 0.067 Jupiter Radius

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 ---
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
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
 ---
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 ---
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
Teff
(K)
2566±26 2566±26 2520±39 --- ---
3352.3333+103.6670-61.8333
 --- 2559±50 2550±55 5780
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 ---
Prot
(days)
3.30±0.14 --- --- --- --- --- --- --- 1.40±0.05 ---
v sin i
(km/s)
--- --- ---
2.04+0.18-0.16
 --- --- --- --- --- ---
Sp. T
M8.0 V --- --- --- --- --- --- --- --- ---
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
Teq
(K)
--- --- 397.6±3.8 --- --- 400.1±7.7 366 400±9 802.860220389002
S
(S⨁)
4.153+0.161-0.159
 --- 4.15±0.16 --- --- 4.25±0.33 --- 4.25±0.38 98.1930529305747
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
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
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)
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
 ---
b
0.0950+0.0650-0.0610
 ---
0.254+0.110-0.085
 --- ---
0.126+0.092-0.078
 --- 0.21±0.14 ---
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 --- --- ---
e
--- 0 --- --- 0.00622±0.00304 <0.081 --- 0 ---
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 ---
ρ
(g/cm3)
5.442+0.265-0.276
 --- --- ---
4.00+0.51-0.50
 3.6±3.1 --- --- ---
a
(au)
0.01154±0.00010 ---
0.011534+0.000099-0.000092
 --- 0.011547750±0.000000057 0.01111±0.00034 --- 0.01111±0.00040 ---
ω
(deg)
--- 90 --- --- 336.86±34.24 --- --- --- ---
Rp/R✶
0.08590±0.00037
0.08507+0.00016-0.00017
 --- --- --- --- --- --- ---
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
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 --- ---
e
--- 0 --- 0.00654±0.00188 <0.083 --- 0
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
ρ
(g/cm3)
5.464+0.221-0.237
 --- ---
4.87+0.46-0.43
 6.45±2.92 --- ---
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
a
(au)
0.01580±0.00013 ---
0.01579+0.00014-0.00013
 0.01581512±0.00000015 0.01521±0.00047 --- 0.01522±0.00055
δ
(%)
0.7123±0.0064 --- --- --- 0.687±0.010 0.7290±0.0240 0.672±0.042
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)
ω
(deg)
--- 90 --- 282.45±17.10 --- --- ---
Rp/R✶
0.08440±0.00038
0.08453+0.00016-0.00017
 --- --- --- --- ---
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 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
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
e
--- --- --- 0.00837±0.00093 <0.070
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
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
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
δ
(%)
0.3676±0.0063 --- --- --- 0.367±0.017
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)
ω
(deg)
--- --- --- -8.73±6.17 ---
Rp/R✶
0.06063±0.00052 --- --- --- ---
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
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
e
--- --- --- 0.00510±0.00058 <0.085
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
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
a
(au)
0.02925±0.00250
0.02924+0.00025-0.00023
 --- 0.02928285±0.00000034
0.02817+0.00083-0.00087
δ
(%)
0.5012±0.0078 --- --- --- 0.519±0.026
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)
ω
(deg)
--- --- --- 108.37±8.47 ---
Rp/R✶
0.07079±0.00055 --- --- --- ---
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
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✶
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
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
e
--- --- --- 0.01007±0.00068 <0.063
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
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
a
(au)
0.03849±0.00033
0.038774+0.000330-0.000310
 --- 0.03853361±0.00000048 0.0371±0.0011
δ
(%)
0.6465±0.0076 --- --- --- 0.673±0.023
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)
ω
(deg)
--- --- --- 368.81±3.11 ---
Rp/R✶
0.08040±0.00047 --- --- --- ---
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
a/R✶
84.591+0.382-0.628
81.7+1.8-2.3
 ---
83.2+0.6-1.2
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
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
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
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
Rp/R✶
0.08692±0.00053 --- --- ---
a
(au)
0.04683±0.00040
0.04681528+0.00040000-0.00037000
 0.04687692±0.00000032 0.0451±0.0014
δ
(%)
0.7555±0.0092 --- --- 0.782±0.027
T14
(hours)
1.1370±0.0047 1.152±0.006 --- 1.140±0.011
Teq
(K)
--- 197.3±1.9 --- 198.6±3.8
TC
(days)
--- 2457665.3628439±0.0000206
(BJD-TDB)
--- 2457665.34937±0.00021
(BJD-TDB)
ω
(deg)
--- --- 191.34±13.83 ---
e
--- --- 0.00208±0.00058 <0.061
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
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
a
(au)
0.06189±0.00053
0.0618656+0.0005300-0.0004900
 0.06193488±0.00000080 ---
0.063+0.027-0.013
δ
(%)
0.3375±0.0101 --- --- 0.346±0.018 0.3520±0.0326
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)
Rp/R✶
0.05809±0.00087 --- --- 0.0588±0.0016 ---
ω
(deg)
--- --- 338.92±9.66 --- ---
Mp
(M⨁)
0.326±0.020 ---
0.331+0.056-0.049
 --- ---
Mp
(MJup)
0.00103±0.00006 ---
0.00104+0.00018-0.00015
 --- ---
e
--- --- 0.00567±0.00121 --- ---
ρ
(g/cm3)
4.16+0.33-0.30
 ---
3.96+0.65-0.56
 --- ---
Print
Known Objects
7 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
7 Associated Literature Data
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  • False Positive Planet
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