exoclock

K2-25b (MEDIUM)

Discovered by: Mann et al. 2016

The Star
Simbad
GAIA
2MASS
K2-25
DR2 3311804515502788352
J04130560+1514520
RA 04:13:05.6134 DEC +15:14:52.013
Parallax
22.215 mas
P.M. RA
122.148 mas/y
P.M. DEC
-18.337 mas/y
MagV
15.56
MagR
13.72
MagI*
12.569
MagJ
11.303
MagH
10.732
MagK
10.444
MagG
14.382
MagGBP
16.075
MagGRP
13.12
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2457651.471616 ± 6.2e-05 BJDTDB
Period
3.48456248 ± 6.4e-07 days

Transit Parameters
Mann et al. 2016
Rp/Rs
0.106 ± 0.029
a/Rs**
25.1 +4.1 -4.1
i
88.3 +1.2 -0.7 deg
e
0.27 +0.16 -0.21
ω
62.0 +44.0 -39.0 deg
DepthR*
13.99 mmag
Duration*
0.79 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Mann et al. 2016
Teff
3180.0 +60.0 -60.0 K
Log(g)
4.98 +0.07 -0.07 cm/s2
Fe/H
0.15 +0.03 -0.03 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 13.69"
Total Observations (Recent) 49 (2)
O-C 0.05 ± 0.42 minutes
ExoClock Observations (Recent) 7 (2)
Space Observations (Recent) 5 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 37 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.1028 ± 0.0055

K2-25b


ExoClock Observations

Planet
Observation Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
K2-25b (MEDIUM)
2022-12-16
Martin Crow
Burnham Observatory
Celestron C9.25
SX694 mono / Clear / 150.0
0.18 ± 2.02
K2-25b (MEDIUM)
2022-01-26
Jacques Michelet
Claix
GSO Ritchey-Chr├ętien
QSI-632 / R / 180.0
-1.54 ± 3.02
K2-25b (MEDIUM)
2021-12-22
Carole Haswell
OSO PIRATE
PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 60.0
0.66 ± 4.32
K2-25b (MEDIUM)
2021-10-17
Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 60.0
-1.38 ± 1.3
K2-25b (MEDIUM)
2021-01-08
Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / I / 60.0
0.01 ± 0.58
K2-25b (MEDIUM)
2020-12-25
Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / I / 60.0
0.94 ± 0.72
K2-25b (MEDIUM)
2020-12-04
Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 90.0
0.33 ± 1.3

Space Observations

Planet
Observation Date
Mission O-C
minutes
K2-25b (MEDIUM)
2021-11-04
TESS1.77 ± 1.73
K2-25b (MEDIUM)
2021-10-31
TESS1.86 ± 2.02
K2-25b (MEDIUM)
2021-10-28
TESS-0.21 ± 1.44
K2-25b (MEDIUM)
2021-10-21
TESS0.69 ± 1.44
K2-25b (MEDIUM)
2021-10-14
TESS-1.72 ± 3.6

Literature Mid-times

Planet
Observation Date
Reference O-C
minutes
2017-05-11 Kain et al. 2020 0.21 ± 0.26
2017-01-02 Kain et al. 2020 0.11 ± 0.2
2016-12-30 Kain et al. 2020 0.24 ± 0.27
2016-12-26 Kain et al. 2020 -0.51 ± 0.25
2016-12-23 Kain et al. 2020 -0.13 ± 0.24
2016-12-19 Kain et al. 2020 0.58 ± 0.3
2016-12-12 Kain et al. 2020 0.39 ± 0.25
2016-12-09 Kain et al. 2020 0.95 ± 0.98
2016-12-09 Kain et al. 2020 -1.07 ± 0.23
2016-12-05 Kain et al. 2020 -0.08 ± 0.24
2016-12-02 Kain et al. 2020 0.22 ± 0.29
2016-11-28 Kain et al. 2020 0.28 ± 0.22
2016-11-25 Kain et al. 2020 0.01 ± 0.25
2016-11-18 Kain et al. 2020 0.24 ± 0.28
2016-11-11 Kain et al. 2020 -0.45 ± 0.27
2016-11-04 Kain et al. 2020 -0.3 ± 0.37
2016-10-28 Kain et al. 2020 0.04 ± 0.33
2016-10-21 Kain et al. 2020 -0.23 ± 0.33
2016-10-14 Kain et al. 2020 -0.1 ± 0.29
2016-10-07 Kain et al. 2020 -0.22 ± 0.5
2015-12-16 Kain et al. 2020 -0.05 ± 0.39
2015-12-09 Kain et al. 2020 0.23 ± 0.25
2015-04-19 Kain et al. 2020 -0.55 ± 0.68
2015-04-12 Kain et al. 2020 -1.51 ± 0.42
2015-04-09 Kain et al. 2020 2.17 ± 0.8
2015-04-05 Kain et al. 2020 0.85 ± 0.5
2015-04-02 Kain et al. 2020 -1.4 ± 0.64
2015-03-29 Kain et al. 2020 1.2 ± 0.55
2015-03-22 Kain et al. 2020 0.24 ± 0.56
2015-03-15 Kain et al. 2020 -0.7 ± 0.53
2015-03-01 Kain et al. 2020 -0.58 ± 0.56
2015-02-26 Kain et al. 2020 0.6 ± 0.53
2015-02-23 Kain et al. 2020 -1.15 ± 0.47
2015-02-19 Kain et al. 2020 1.52 ± 0.56
2015-02-16 Kain et al. 2020 -1.86 ± 0.54
2015-02-12 Kain et al. 2020 1.37 ± 0.49
2015-02-09 Kain et al. 2020 2.14 ± 0.5
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