NASA
Exoplanet
Archive
A
service of
NASA
Exoplanet
Science
Institute

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
Architecture
TRAPPIST-1
TRAPPIST-1
TRAPPIST-1 b
TRAPPIST-1 c
TRAPPIST-1 d
TRAPPIST-1 e
TRAPPIST-1 f
TRAPPIST-1 g
TRAPPIST-1 h
Other Data
Bibliography 13
Exoplanet Archive Notes 3
Nearby Data 5
Discovery Data
Host Planet Method Year Reference Disposition
TRAPPIST-1 TRAPPIST-1 b Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 c Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 d Transit 2016 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 e Transit 2017 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 f Transit 2017 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 g Transit 2017 Gillon et al. 2016 Confirmed Planet
TRAPPIST-1 TRAPPIST-1 h Transit 2017 Gillon et al. 2016 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
ExoFOP Target Overview Page
IRSA Finding Chart
TOI
K2 Names
K2 Planets and Candidates
K2 Targets
Stellar Hosts
K2 Time Series
Source 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-TESS TOI Show Candidate Solutions >> << Hide Candidate Solutions
v sin i
(km/s)
--- ---
2.04+0.18-0.16
 --- --- --- --- --- ---
Teff
(K)
2566±26 2520±39 --- ---
3352.3333+103.6670-61.8333
 --- 2559±50 2550±55 5780
R✶
(R⦿)
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
 --- --- 5.2759600±0.0719093 --- --- --- --- 5.2759600±0.0719093
L✶
(log10(L⦿))
-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)
--- 0.05350±0.08800 [Fe/H] --- --- --- --- 0.040±0.080 [Fe/H] 0.040±0.080 [Fe/H] ---
Age
(Gyr)
--- --- --- --- --- --- --- >0.5 ---
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 --- 0.09077820±0.02000690 --- 0.089±0.007 0.0802±0.0073 0.080±0.009 ---
Prot
(days)
--- --- --- --- --- --- --- 1.40±0.05 ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Transit Prediction Service
TOI
K2 Names
K2 Planets and Candidates
Transit
Atmospheric Spectroscopy
Source Agol et al. 2021 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-TESS TOI Show Candidate Solutions >> << Hide Candidate Solutions
P
(days)
1.510826±0.000006 1.51088432±0.00000015
1.51087+0.00022-0.00017
 --- 1.51087081±0.00000060 --- 1.510848±0.000019 1.51094471179194±0.00012604707000
TC
(days)
--- 2457322.514193±0.000003
2458362.0021+0.0016-0.0022
 --- 2457322.51736±0.00010 2457512.88646±0.00030 2457322.51765±0.00025 2460209.80835200±0.00109332
λ
(deg)
--- ---
15+26-30
 --- --- --- --- ---
a/R✶
20.843+0.094-0.155
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
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
--- --- --- 0.00622±0.00304 <0.081 --- 0 ---
i
(deg)
89.728±0.165 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 --- --- ---
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
a
(au)
0.01154±0.00010
0.011534+0.000099-0.000092
 --- 0.011547750±0.000000057 0.01111±0.00034 --- 0.01111±0.00040 ---
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
ω
(deg)
--- --- --- 336.86±34.24 --- --- --- ---
Rp/R✶
0.08590±0.00037 --- --- --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Atmospheric Spectroscopy
Source Agol et al. 2021 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
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
--- --- 0.00654±0.00188 <0.083 --- 0
i
(deg)
89.778±0.118 89.47±0.24 --- 89.67±0.17 89.58±0.11 89.50±0.31
P
(days)
2.421937±0.000018 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)
--- 2457282.8113871±0.0000038 --- 2457282.80728±0.00019 2457512.88019±0.00016 2457362.72618±0.00033
ω
(deg)
--- --- 282.45±17.10 --- --- ---
Rp/R✶
0.08440±0.00038 --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Source Agol et al. 2021 Ducrot et al. 2020 Grimm et al. 2018 Gillon et al. 2017
ω
(deg)
--- --- -8.73±6.17 ---
Mp
(M⨁)
0.388±0.012 ---
0.297+0.039-0.035
 0.41±0.27
Mp
(MJup)
0.00122±0.00004 ---
0.000934+0.000123-0.000110
 0.0013±0.0008
e
--- --- 0.00837±0.00093 <0.070
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
 --- 0.784±0.023 0.772±0.030
Rp
(RJup)
0.0703+0.0010-0.0009
 --- 0.0699±0.0021 0.0689±0.0027
a
(au)
0.02227±0.00019
0.02226+0.00019-0.00018
 0.02228038±0.00000044
0.02144+0.00066-0.00063
a/R✶
40.216+0.182-0.299
38.85+0.88-1.10
 ---
39.55+0.30-0.59
b
0.0630+0.0630-0.0430
0.235+0.120-0.094
 --- 0.17±0.11
S
(S⨁)
1.115±0.043 1.114±0.043 --- 1.143±0.088
i
(deg)
89.896±0.077 89.65±0.15 --- 89.75±0.16
P
(days)
4.049219±0.000026 4.04978035±0.00000266 --- 4.049610±0.000063
Rp/R✶
0.06063±0.00052 --- --- ---
δ
(%)
0.3676±0.0063 --- --- 0.367±0.017
T14
(hours)
0.8145±0.0040 0.8228±0.0053 --- 0.8188±0.0110
Teq
(K)
--- 286.2±2.8 --- 288.0±5.6
TC
(days)
--- 2457670.1463014±0.0000184 --- 2457670.14165±0.00035
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
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
P
(days)
6.101013±0.000035 6.09956479±0.00000178
6.09705+0.00096-0.00093
 --- 6.099615±0.000011
TC
(days)
--- 2457660.3676621±0.0000143
2458361.8113+0.0028-0.0025
 --- 2457660.37859±0.00038
λ
(deg)
--- ---
9.0+45.0-51.0
 --- ---
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
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
ω
(deg)
--- --- --- 108.37±8.47 ---
Rp/R✶
0.07079±0.00055 --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
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
P
(days)
9.207540±0.000032 9.20659399±0.00000212 9.2129±0.0010 --- 9.206690±0.000015
TC
(days)
--- 2457671.3737299±0.0000157 2458361.8545±0.0018 --- 2457671.39767±0.00023
λ
(deg)
--- --- 21±32 --- ---
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
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
ω
(deg)
--- --- --- 368.81±3.11 ---
Rp/R✶
0.08040±0.00047 --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
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
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
Rp/R✶
0.08692±0.00053 --- --- ---
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 --- 2457665.34937±0.00021
Print
Status
Confirmed Planet
Detected By
Transit Timing Variations, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
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 --- 2457662.55284±0.00037 2457662.55463±0.00056
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
 --- ---
Rp/R✶
0.05809±0.00087 --- --- 0.0588±0.0016 ---
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
External Link
Search
Browse
Download

NASA Exoplanet Archive is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program.