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GJ 9827 Overview

GJ 9827 0.63 R⦿ 4199.00 K
GJ 9827 b
0.128 RJup
GJ 9827 c
0.101 RJup
GJ 9827 d
0.177 RJup
Architecture
GJ 9827
GJ 9827
GJ 9827 b
GJ 9827 c
GJ 9827 d
Other Data
Bibliography 20
Exoplanet Archive Notes 4
Nearby Data 5
Discovery Data
Host Planet Method Year Reference Disposition
GJ 9827 GJ 9827 b Transit 2017 Niraula et al. 2017 Confirmed Planet
GJ 9827 GJ 9827 c Transit 2017 Niraula et al. 2017 Confirmed Planet
GJ 9827 GJ 9827 d Transit 2017 Niraula et al. 2017 Confirmed Planet
GJ 9827 GJ 9827 b GJ 9827 c GJ 9827 d
RA
23h27m05.23s
Dec
-01d17m07.24s
Distance
29.6610+0.0543-0.0541
pc
Parallax
33.6855000±0.0611343 mas
Ecliptic Latitude
2.08221 deg
Ecliptic Longitude
351.93155 deg
Galactic Latitude
-57.18299 deg
Galactic Longitude
81.34803 deg
Total Proper Motion
433.6784124±0.0891140 mas/yr
Proper Motion (RA)
376.0190000±0.0944988 mas/yr
Proper Motion (Dec)
216.0710000±0.0703346 mas/yr
Photometry
mV
10.37±0.03
mTESS
9.0684±0.0060
mJ
7.984±0.020
mH
7.379±0.042
mKs
7.193±0.024
mKep
10.277
mW1
6.990±0.041
mW2
7.155±0.020
mW3
7.114±0.017
mW4
6.957±0.107
mIc
8.890±0.008
mGaia
9.837730±0.000411
mB
11.588±0.034
mg
11.1637000±0.0005387
mi
13.1720000±0.0087852
mr
9.9025700±0.0003783
mu
14.7056000±0.0059104
mz
9.8503900±0.0012146
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 Howard et al. 2025 Piaulet-Ghorayeb et al. 2024 Passegger et al. 2024 Bonomo et al. 2023 TICv8 Dai et al. 2019 Rice et al. 2019 Prieto-Arranz et al. 2018 Gaia DR2 Rodriguez et al. 2018 Niraula et al. 2017 Hawley et al. 1996 ExoFOP-TESS TOI Show Candidate Solutions >> << Hide Candidate Solutions
Teff
(K)
4294.0±52.0 4236±12 4236±12 4305±49
4199.000+123.026-131.362
 4255±110
4340+40-53
 4219±70
4173.5435+296.5170-67.1335
4269+98-99
 4255±110 --- 4199.000±127.194
L✶
(log10(L⦿))
---
-1.00+0.04-0.04
 --- ---
-0.9483205+0.0364101-0.0215994
 --- --- ---
-0.94151578+0.00104421-0.00104669
 --- --- --- ---
ρ✶
(g/cm3)
--- --- --- ---
3.6484472+1.5527686-0.8709977
3.97+0.20-0.15
 --- --- ---
3.76+0.75-0.57
 --- --- ---
M✶
(M⦿)
0.593±0.018 0.62±0.04 0.62±0.04
0.606+0.015-0.014
0.6600000+0.0682165-0.0982891
0.606+0.020-0.015
0.606+0.020-0.014
 0.637±0.051 ---
0.614+0.030-0.029
 0.659±0.060 --- ---
R✶
(R⦿)
0.579±0.018 0.58±0.03 0.58±0.03
0.602+0.005-0.004
0.6341630+0.0711925-0.0497724
0.5994+0.0081-0.0085
0.602+0.005-0.004
 0.622±0.051
0.6469711+0.0213268-0.0829855
0.613+0.033-0.034
 0.651±0.065 --- 0.63±0.06
log g
(log10(cm/s2))
4.682±0.021 4.70±0.05 4.719±0.013 ---
4.653210+0.138511-0.083781
 4.70±0.15
4.660+0.015-0.010
 4.657±0.042 ---
4.651+0.055-0.050
 4.70±0.15 --- 4.653210±0.111146
Metallicity
(dex)
-0.26±0.08 [Fe/H] -0.29±0.03 [Fe/H] -0.29±0.03 [Fe/H] -0.26±0.09 [Fe/H] --- -0.28±0.12 [Fe/H] -0.26±0.09 [M/H] -0.29±0.12 [Fe/H] --- -0.5±0.1 [M/H] -0.28±0.12 [Fe/H] --- ---
γ
(km/s)
--- --- --- --- --- --- ---
31.94888+0.00035-0.00034
 --- --- --- --- ---
v sin i
(km/s)
2.43±1.00 --- <1.75 --- --- --- <2 1.5±1.0 --- 1.3±1.5 2±1 --- ---
Sp. T
--- K7 V K7 V --- --- --- --- K6 V --- K5 V K6 V K5 ---
Age
(Gyr)
--- 5.465±4.058 5.465±4.058
10+3-5
 --- --- 10 --- --- --- --- --- ---
Prot
(days)
---
28.16+3.38-2.66
28.16+3.38-2.66
28.90+1.09-0.70
 --- --- 28.72±0.19 --- --- --- 16.9±1.8 --- ---
CAII LOG RHK
--- --- -5.28±0.05 --- --- --- --- --- --- --- --- --- ---
S Index
0.6446 --- --- --- --- --- --- --- --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Radial Velocity, Transit
Tools
Transit Prediction Service
TOI
K2 Names
K2 Planets and Candidates
Transit
Source Passegger et al. 2024 Howard et al. 2025 Bonomo et al. 2023 Kokori et al. 2023 Dai et al. 2019 Rice et al. 2019 Prieto-Arranz et al. 2018 Rodriguez et al. 2018 Niraula et al. 2017 ExoFOP-TESS TOI Show Candidate Solutions >> << Hide Candidate Solutions
Teq
(K)
1035.01±29.07 1055.0±21.0 1175±14 --- --- ---
1114+46-26
 1172±43
1043.5+36.2-31.3
 1183
S
(S⨁)
--- 294.0±24.0 318±16 --- --- ---
256+44-23
315+48-44
 --- 325.749
P
(days)
1.208974±0.000001 1.2089765±0.0000023 1.2089819±0.0000071 1.2089749±0.0000010 1.209
1.20898190+0.00000693-0.00000714
 1.208966±0.000012
1.2089802+0.0000084-0.0000081
1.208957+0.000013-0.000012
 1.2089755±0.0000003
Rp
(R⨁)
1.44+0.09-0.07
 1.52900±0.05787
1.577+0.027-0.031
 ---
1.571+0.033-0.039
1.577+0.027-0.031
1.58+0.14-0.13
 1.62±0.11
1.75+0.11-0.12
 1.686450±0.164422
Rp
(RJup)
0.128+0.008-0.006
 0.136408±0.005163
0.1407+0.0024-0.0028
 ---
0.1402+0.0029-0.0035
0.1407+0.0024-0.0028
0.141+0.012-0.012
 0.145±0.010
0.156+0.010-0.011
 0.1504553±0.0146688
δ
(%)
--- --- --- --- --- --- ---
0.0586+0.0019-0.0023
 --- 0.06680000±0.00236472
T14
(hours)
--- --- --- --- ---
1.265+0.022-0.020
 1.281±0.020
1.260+0.018-0.017
1.630+0.085-0.079
 1.286±0.135
TC
(days)
2457738.8259±0.0005 2457738.82586±0.00026 2457738.82586±0.00026 2457831.91720±0.00026 --- 2457738.82586±0.00026
2457738.82646+0.00044-0.00042
2457738.82588+0.00030-0.00031
2457738.82671+0.00044-0.00047
 2460231.7338310±0.0006433
a/R✶
--- --- ---
6.72+0.08-0.09
 ---
6.719+0.080-0.086
7.23+0.19-0.55
6.62+0.41-0.35
6.68+0.42-0.44
 ---
b
0.30+0.14-0.16
 --- --- --- ---
0.4602+0.0352-0.0443
0.21+0.23-0.14
0.493+0.080-0.120
 0.57±0.13 ---
Mp
(M⨁)
4.28+0.35-0.33
 4.87±0.37 5.14±0.47 ---
4.89+0.43-0.42
 4.91±0.49
3.69+0.48-0.46
3.42+1.20-0.76
 --- ---
Mp
(MJup)
0.0135+0.0011-0.0010
 0.0153±0.0012 0.0162±0.0015 ---
0.0154+0.0014-0.0013
 0.0154±0.0015
0.0116+0.0015-0.0014
0.0108+0.0038-0.0024
 --- ---
e
--- --- <0.063 --- --- 0 --- --- --- ---
i
(deg)
87.60+1.31-1.27
 ---
86.07+0.41-0.34
86.1+0.4-0.3
 ---
86.07+0.41-0.34
88.33+1.15-2.10
85.73+1.20-0.96
85.08+1.08-1.05
 ---
ρ
(g/cm3)
7.858±1.467
7.47+1.10-0.95
7.19+0.81-0.76
 ---
6.9+1.0-1.1
6.93+0.82-0.76
5.11+1.74-1.27
4.50+1.50-0.98
 --- ---
Rp/R✶
--- --- --- 0.0240±0.0004
0.02401+0.00038-0.00049
0.02396+0.00037-0.00044
0.02322+0.00058-0.00037
0.02420+0.00040-0.00047
0.0246+0.0004-0.0006
 ---
K
(m/s)
3.53±0.22 --- 4.31±0.39 ---
4.10+0.35-0.34
 4.11±0.40 3.00±0.35
2.84+0.97-0.64
 --- ---
a
(au)
0.0189±0.0004 --- 0.01880±0.00016 --- ---
0.01880+0.00020-0.00014
0.0206+0.0020-0.0023
0.01888+0.00030-0.00031
 0.020±0.002 ---
Tp
(days)
2457738.8259±0.0005 --- --- --- --- --- ---
2457738.82588+0.00030-0.00031
 --- ---
Mp sin i
(M⨁)
--- --- --- --- --- --- ---
3.41+1.20-0.76
 --- ---
Mp sin i
(MJup)
--- --- --- --- --- --- ---
0.0107+0.0038-0.0024
 --- ---
Print
Status
Confirmed Planet
Detected By
Radial Velocity, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Source Passegger et al. 2024 Howard et al. 2025 Bonomo et al. 2023 Kokori et al. 2023 Rice et al. 2019 Prieto-Arranz et al. 2018 Rodriguez et al. 2018 Niraula et al. 2017
a/R✶
--- --- --- 14.04±0.17
14.035+0.172-0.171
15.10+0.39-1.14
13.83+0.86-0.74
13.96+0.87-0.92
b
0.23+0.17-0.15
 --- --- ---
0.4428+0.0415-0.0483
0.25+0.21-0.16
0.469+0.085-0.130
 0.53±0.14
Mp
(M⨁)
1.86+0.37-0.39
 1.92±0.49 <1.3 --- 0.84
1.45+0.58-0.57
2.42+0.75-0.49
 ---
Mp
(MJup)
0.00585+0.00116-0.00123
 0.00604±0.00154 <0.0041 --- 0.0026
0.00456+0.00182-0.00179
0.00761+0.00236-0.00154
 ---
e
--- --- <0.094 --- 0 --- --- ---
i
(deg)
89.09+0.60-0.68
 ---
88.19+0.21-0.18
88.19+0.21-0.18
88.19+0.21-0.18
89.07+0.59-0.92
88.05+0.64-0.48
87.81+0.57-0.54
P
(days)
3.648103+0.000013-0.000010
 3.648095±0.000024 3.648096±0.000063 3.6481145±0.0000096
3.6480957+0.0000633-0.0000621
 3.64823±0.00012
3.648083+0.000060-0.000058
 3.64802±0.00011
ρ
(g/cm3)
7.142±1.857
6.1+1.8-1.6
 <3.7 --- 2.42
4.13+2.31-1.77
6.4+2.0-1.1
 ---
Rp
(R⨁)
1.13+0.07-0.05
 1.20100±0.04586
1.241+0.024-0.026
 ---
1.241+0.024-0.026
 1.24±0.11
1.269+0.087-0.089
 1.36±0.09
Rp
(RJup)
0.101+0.006-0.004
 0.107146±0.004091
0.1107+0.0021-0.0023
 ---
0.1107+0.0021-0.0023
 0.111±0.010
0.1132+0.0078-0.0079
 0.121±0.008
Rp/R✶
--- --- --- 0.01887±0.00034
0.01887+0.00034-0.00037
0.01820+0.00054-0.00041
0.01899+0.00034-0.00037
0.0192+0.0004-0.0005
K
(m/s)
1.06±0.21 --- <0.75 --- 0.49 0.820±0.320
1.39+0.44-0.29
 ---
a
(au)
0.0395±0.0009 --- 0.03925±0.00033 ---
0.03925+0.00042-0.00029
0.0429+0.0042-0.0048
0.03942+0.00062-0.00064
 0.042±0.003
T14
(hours)
--- --- --- --- 1.825±0.037 1.825±0.042 1.83±0.03
2.190+0.031-0.038
TC
(days)
2457742.2000±0.0014
2457742.19929+0.00072-0.00071
 2457742.19930±0.00073 2457851.64378±0.00075
2457742.19930+0.00072-0.00073
 2457738.5496±0.0015
2457742.19944+0.00063-0.00068
2457738.55194+0.00138-0.00137
Teq
(K)
715.94±20.33 730.0±15.0 813±10 --- ---
771+31-18
 811±30
721.9+25.0-21.5
S
(S⨁)
--- 67.0±5.0 73.0±3.7 --- ---
59+10-5
72+11-10
 ---
Tp
(days)
2457742.2000±0.0014 --- --- --- --- ---
2457742.19944+0.00063-0.00068
 ---
Mp sin i
(M⨁)
--- --- --- --- --- ---
2.42+0.75-0.49
 ---
Mp sin i
(MJup)
--- --- --- --- --- ---
0.00761+0.00236-0.00154
 ---
δ
(%)
--- --- --- --- --- ---
0.0361+0.0013-0.0014
 ---
Print
Status
Confirmed Planet
Detected By
Radial Velocity, Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Atmospheric Spectroscopy
Source Piaulet-Ghorayeb et al. 2024 Howard et al. 2025 Passegger et al. 2024 Bonomo et al. 2023 Rice et al. 2019 Prieto-Arranz et al. 2018 Rodriguez et al. 2018 Niraula et al. 2017
a/R✶
19.739+0.619-0.853
 --- --- ---
20.003+0.230-0.254
21.51+0.56-1.63
19.7+1.2-1.0
19.88+1.24-1.30
b
0.891+0.009-0.010
 ---
0.85+0.02-0.03
 ---
0.8927+0.0071-0.0090
0.864+0.022-0.013
0.896+0.012-0.016
 0.91±0.09
Mp
(M⨁)
3.02+0.58-0.57
 3.42±0.62
3.02+0.58-0.57
3.53+0.87-0.88
4.04+0.82-0.84
2.35+0.70-0.68
5.2+1.8-1.2
 ---
Mp
(MJup)
0.00950+0.00182-0.00179
 0.0108±0.0020
0.00950+0.00182-0.00179
0.0111+0.0027-0.0028
0.0127+0.0026-0.0026
0.00739+0.00220-0.00214
0.016+0.006-0.004
 ---
e
--- --- --- <0.13 0 --- --- ---
i
(deg)
87.41+0.09-0.11
 ---
87.66+0.13-0.16
 87.443±0.045 87.443±0.045
87.70+0.08-0.25
87.39+0.20-0.18
87.39+0.20-0.23
P
(days)
6.201830±0.000003 6.20183±0.00001 6.201812±0.000009 6.201470±0.000063
6.2014698+0.0000626-0.0000611
 6.20142±0.00013
6.201467+0.000062-0.000061
6.20141+0.00013-0.00010
ρ
(g/cm3)
---
2.51+0.57-0.51
 2.454±0.739
2.34+0.62-0.59
2.69+0.58-0.57
1.51+0.71-0.53
3.23+1.10-0.72
 ---
Rp
(R⨁)
1.98+0.11-0.10
 1.95500±0.07535
1.89+0.16-0.14
2.022+0.046-0.043
2.022+0.046-0.043
 2.04±0.18 2.07±0.14 2.10±0.15
Rp
(RJup)
0.177+0.010-0.009
 0.174414±0.006722
0.169+0.014-0.012
0.1804+0.0041-0.0038
0.1804+0.0041-0.0038
 0.182±0.016 0.185±0.012 0.187±0.013
Rp/R✶
--- --- --- ---
0.03073+0.00065-0.00060
0.02993+0.00101-0.00078
0.03093+0.00065-0.00059
0.0295+0.0011-0.0009
K
(m/s)
--- --- 1.44±0.27 1.73±0.43 1.97±0.40 1.11±0.32
2.50+0.86-0.58
 ---
a
(au)
0.053±0.003 --- 0.0563±0.0012 0.05590±0.00046
0.05591+0.00059-0.00041
0.0611+0.0060-0.0068
0.05615+0.00089-0.00091
 0.060±0.005
T14
(hours)
--- --- --- ---
1.223+0.035-0.029
1.248+0.038-0.033
1.23+0.03-0.02
1.600+0.065-0.078
TC
(days)
2460265.10196±0.00006
2457740.96114+0.00045-0.00044
2457740.9588+0.0008-0.0009
 2457740.96115±0.00045
2457740.96115+0.00044-0.00045
2457740.96198+0.00084-0.00086
 2457740.96110±0.00044
2457740.96099+0.00082-0.00085
Teq
(K)
675+14-12
 612.0±12.0 599.68±16.86 681±8 ---
646+26-15
 680±25
604.9+20.8-18.0
S
(S⨁)
34.9+2.8-2.6
 33.0±3.0 --- 36.0±1.9 ---
29+5-3
35.6+5.4-5.0
 ---
Tp
(days)
--- ---
2457740.9588+0.0008-0.0009
 --- --- --- 2457740.96110±0.00044 ---
Mp sin i
(M⨁)
--- --- --- --- --- ---
5.2+1.8-1.2
 ---
Mp sin i
(MJup)
--- --- --- --- --- ---
0.016+0.006-0.004
 ---
δ
(%)
--- --- --- --- --- ---
0.0957+0.0041-0.0036
 ---
Print
Literature Time Series (1 File Type, 1 File)
File Type Data Points Filter Reference
Photometric Light Curve     74 Hp (Hipparcos) Hipparcos and Tycho Catalogs
Known Objects
3 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
3 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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