results

K2-30 b

Timing Plot

Total Reductions to Date: 22

Date Processed: 09/06/2025 at 07:00:04 (PDT)

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 4.098475750868882 5.728923611585135e-07
Ephemeris (BJD_TDB) 2460231.9290472614 0.0003860467770055552
Time saved (hours) -  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 52.3420548 decimal
DEC 22.2993491 decimal
Host Star Metallicity -0.15 0.05 Kokori et al. 2023
Host Star log(g) 4.54 0.029 Log10(cgs) Kokori et al. 2023
Host Star Radius [R_Sun] 0.844 0.032 Sol Kokori et al. 2023
Host Star Effective Temperature [K] 5425.0 40.0 K Kokori et al. 2023
a/Rs 12.3 0.4 Kokori et al. 2023
eccentricity 0.08 0.036 Brahm et al. 2016
inclination [degrees] 86.92 0.26 deg Kokori et al. 2023
omega [degrees] 120.0 100.0 deg Lillo-Box et al. 2016
orbital period [days] 4.09847804 6.9e-07 day Kokori et al. 2023
Rp 13.14 0.35 R_Earth Kruse et al. 2019
Rp/Rs 0.1308 0 Kruse et al. 2019
ephemeris [JD] 2457526.93509 0.00014 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2457067.905516667 0.00020466666666666666 BJD, BJD-TDB, nan Mayo et al. 2018, Brahm et al. 2016, Crossfield et al. 2016
2457395.78391 0.00013 BJD-TDB Kokori et al. 2022
2457526.93509 0.00014 BJD-TDB Kokori et al. 2023
2459449.120055 0.00030712 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0010230
Parameter Value Uncertainty
Am1 2.06 0.95
Am2 -0.48 0.21
a/Rs 13.41 1.15
Rp/Rs 0.001 0.072
ephemeris [JD] 2458440.885 0.012
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6321643313487482
u1 -2.784124614116538
u2 3.442223006887959
u3 -1.2902626728270494
duration 0.074 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO DJSA (collaborate/publish) MOBS
Light curve chart for 0003288
Parameter Value Uncertainty
Am1 1.184 0.026
Am2 -0.16 0.19
a/Rs 14.08 1.15
Rp/Rs 0.128 0.038
ephemeris [JD] 2458510.57 0.011
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.631935698298694
u1 -2.784004291969055
u2 3.4424888078822575
u3 -1.290420162914816
duration 0 0
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO SGDA (collaborate/publish) MOBS
Light curve chart for 0006163
Parameter Value Uncertainty
Am1 2.81 0.099
Am2 -1.0 0.16
a/Rs 13.14 1.1
Rp/Rs 0.186 0.063
ephemeris [JD] 2458510.561 0.01
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.632454351397992
u1 -2.785214509838715
u2 3.4436155642894617
u3 -1.2908553545348678
duration 0 0
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO WGAC (collaborate/publish) MOBS
Light curve chart for 0000235
Parameter Value Uncertainty
Am1 0.13299 0.00072
Am2 -0.016 0.018
a/Rs 13.57 0.63
Rp/Rs 0.1256 0.0066
ephemeris [JD] 2458793.3692 0.0032
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.9967876573163235
u1 -3.396604971885402
u2 3.7663664157593826
u3 -1.366549045067071
duration 0.0808 0.0061
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
R Cousins R 561.7 nm 719.7 nm
Organization Observer Code Secondary Observers
AAVSO MNIC (collaborate/publish)
Light curve chart for 0004005
Parameter Value Uncertainty
Am1 1.061 0.024
Am2 -0.023 0.02
a/Rs 12.21 1.03
Rp/Rs 0.233 0.049
ephemeris [JD] 2458805.6603 0.006
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6317418164405253
u1 -2.7825923034147464
u2 3.4404528365263056
u3 -1.2896022982853421
duration 0.0856 0.0091
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO PAIB (collaborate/publish) MOBS
Light curve chart for 0011259
Parameter Value Uncertainty
Am1 1.239 0.034
Am2 -0.201 0.096
a/Rs 12.22 1.05
Rp/Rs 0.177 0.043
ephemeris [JD] 2458846.6611 0.0075
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6318058842451546
u1 -2.7825188385390454
u2 3.4402162378485435
u3 -1.2895032322914362
duration 0.1 0.013
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO WMAI (collaborate/publish) MOBS
Light curve chart for 0009409
Parameter Value Uncertainty
Am1 0.968 0.097
Am2 0.035 0.073
a/Rs 14.17 1.16
Rp/Rs 0.177 0.073
ephemeris [JD] 2459104.861 0.011
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6320210202691394
u1 -2.782695825637122
u2 3.4400874817440275
u3 -1.2894126251147466
duration 0.079 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO MKEE (collaborate/publish) MOBS
Light curve chart for 0007301
Parameter Value Uncertainty
Am1 1.061 0.03
Am2 -0.026 0.019
a/Rs 13.5 1.13
Rp/Rs 0.23 0.067
ephemeris [JD] 2459141.7276 0.009
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6316423890169296
u1 -2.782327047221193
u2 3.440249808699363
u3 -1.2895650992313823
duration 0.075 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO JAHB (collaborate/publish) MOBS
Light curve chart for 0004427
Parameter Value Uncertainty
Am1 1.151 0.03
Am2 -0.133 0.066
a/Rs 11.27 1.09
Rp/Rs 0.17 0.029
ephemeris [JD] 2459145.8529 0.0051
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6325845511909147
u1 -2.7847387102690697
u2 3.442694069966346
u3 -1.2905398595880517
duration 0.112 0.015
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO LELA (collaborate/publish) MOBS
Light curve chart for 0002779
Parameter Value Uncertainty
Am1 0.98 0.028
Am2 0.023 0.025
a/Rs 13.4 0.88
Rp/Rs 0.16 0.035
ephemeris [JD] 2459149.9277 0.0063
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.632302341535236
u1 -2.784227161604851
u2 3.442351989210893
u3 -1.2904271178462365
duration 0.0862 0.0093
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO GMAI (collaborate/publish) MOBS
Light curve chart for 0007142
Parameter Value Uncertainty
Am1 0.933 0.034
Am2 0.056 0.01
a/Rs 14.26 1.19
Rp/Rs 0.132 0.046
ephemeris [JD] 2459178.637 0.012
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6315792861170562
u1 -2.7828460215853688
u2 3.4410778443551724
u3 -1.2898110576108044
duration 0.076 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO GDAP (collaborate/publish) MOBS
Light curve chart for 0009632
Parameter Value Uncertainty
Am1 1.113 0.041
Am2 -0.082 0.057
a/Rs 13.86 1.22
Rp/Rs 0.217 0.061
ephemeris [JD] 2459223.6843 0.0081
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.631923786273321
u1 -2.7831098250548587
u2 3.441013270731832
u3 -1.2898271806752004
duration 0.067 0.01
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO DJSA (collaborate/publish) MOBS
Light curve chart for 0011004
Parameter Value Uncertainty
Am1 1.036 0.051
Am2 -0.0122 0.008
a/Rs 14.27 1.14
Rp/Rs 0.161 0.053
ephemeris [JD] 2459264.69 0.011
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.632171878931417
u1 -2.7835180945302103
u2 3.44130506911302
u3 -1.2899588022347852
duration 0.079 0.011
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO NLIC (collaborate/publish) MOBS
Light curve chart for 0007187
Parameter Value Uncertainty
Am1 0.963 0.037
Am2 0.017 0.0058
a/Rs 14.2 1.12
Rp/Rs 0.157 0.046
ephemeris [JD] 2459514.6837 0.0096
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.631533279029378
u1 -2.7819989655237802
u2 3.4399380385395553
u3 -1.2894723007860818
duration 0.079 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO RKAC (collaborate/publish) MOBS
Light curve chart for 0005039
Parameter Value Uncertainty
Am1 0.986 0.021
Am2 0.012 0.02
a/Rs 12.74 0.99
Rp/Rs 0.14 0.035
ephemeris [JD] 2459522.8778 0.0061
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6318140112717991
u1 -2.782911640726697
u2 3.4409690506665194
u3 -1.2898713699371869
duration 0.09 0.01
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO WGAC (collaborate/publish) MOBS
Light curve chart for 0007988
Parameter Value Uncertainty
Am1 0.969 0.024
Am2 0.033 0.039
a/Rs 12.43 1.08
Rp/Rs 0.134 0.032
ephemeris [JD] 2459895.8602 0.0078
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.632007875721511
u1 -2.7835842333892735
u2 3.441666157675641
u3 -1.2900897487230565
duration 0.093 0.012
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO DMIF (collaborate/publish) MOBS
Light curve chart for 0002226
Parameter Value Uncertainty
Am1 0.988 0.011
Am2 0.0125 0.0088
a/Rs 12.04 0.92
Rp/Rs 0.103 0.015
ephemeris [JD] 2459928.6361 0.0057
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6322111014324017
u1 -2.784139698819251
u2 3.442304404474315
u3 -1.290375755793133
duration 0.0906 0.0084
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO CCHD (collaborate/publish)
Light curve chart for 0002233
Parameter Value Uncertainty
Am1 0.9434 0.0043
Am2 0.052 0.011
a/Rs 12.62 0.5
Rp/Rs 0.1031 0.0062
ephemeris [JD] 2459932.7428 0.002
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.918562820356025
u1 -3.402351487047166
u2 3.91385628577323
u3 -1.4300675607610858
duration 0.0875 0.0054
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CV MObs CV 350.0 nm 850.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)
Light curve chart for 0008465
Parameter Value Uncertainty
Am1 1.002 0.014
Am2 -0.007 0.078
a/Rs 13.78 1.06
Rp/Rs 0.137 0.03
ephemeris [JD] 2459969.6326 0.0064
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6321491141825426
u1 -2.7844796372233827
u2 3.4430595236669617
u3 -1.290728949320537
duration 0.079 0.01
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO GHAB (collaborate/publish) MOBS
Light curve chart for 0004400
Parameter Value Uncertainty
Am1 1.137 0.05
Am2 -0.097 0.063
a/Rs 10.57 1.18
Rp/Rs 0.133 0.05
ephemeris [JD] 2460190.95 0.012
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.6322004086416995
u1 -2.784621436478175
u2 3.443169406254584
u3 -1.2907483271108862
duration 0.11 0.014
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO CPHB (collaborate/publish) MOBS
Light curve chart for 0004746
Parameter Value Uncertainty
Am1 0.9753 0.0089
Am2 0.0204 0.0097
a/Rs 10.35 1.11
Rp/Rs 0.1298 0.0086
ephemeris [JD] 2460227.8435 0.0061
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.9186597622762889
u1 -3.403646874895064
u2 3.915854198932234
u3 -1.4308670279626843
duration 0.119 0.017
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CV MObs CV 350.0 nm 850.0 nm
Organization Observer Code Secondary Observers
AAVSO NANF (collaborate/publish)
Light curve chart for 0004738
Parameter Value Uncertainty
Am1 1.02 0.0033
Am2 -0.0177 0.0074
a/Rs 12.2 0.28
Rp/Rs 0.1306 0.0041
ephemeris [JD] 2460231.928 0.0011
eccentricity 0.08
inclination [degrees] 86.92
omega [degrees] 120.0
orbital period [days] 4.09847804
u0 1.9181383135208727
u1 -3.4012687255330487
u2 3.9126704512112624
u3 -1.4295399808957536
duration 0.0953 0.0031
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CV MObs CV 350.0 nm 850.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)