exoclock

K2-121b (LOW)

Discovered by: Dressing et al. 2017

The Star
Simbad
GAIA
2MASS		 K2-121
DR2 662078902422542336
J08274481+1734457
RA 08:27:44.8140 DEC +17:34:45.804
Parallax
5.875 mas		 P.M. RA
-13.87 mas/y		 P.M. DEC
-14.712 mas/y
MagV
13.32		 MagR
12.98		 MagI*
12.121		 MagJ
11.309		 MagH
10.742		 MagK
10.616
MagG
12.925		 MagGBP
13.552		 MagGRP
12.189
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2458092.553641 ± 8.7e-05 BJDTDB
Period
5.1857532 ± 8.3e-07 days
Transit Parameters
Dressing et al. 2017
Rp/Rs
0.109 ± 0.005		 a/Rs**
14.46 +0.16 -0.12
 i
87.2 +0.9 -0.5 deg
e
0.22 +0.19 -0.18
 ω
73.0 +64.9 -104.5 deg
DepthR*
14.93 mmag		 Duration*
2.12 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Dressing et al. 2017
Teff
4471.4 +111.6 -103.6 K
 Log(g)
4.52 +0.06 -0.06 cm/s2
 Fe/H
0.0 +0.0 -0.0 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 7.85"
Total Observations (Recent) 52 (13)
O-C 0.35 ± 0.28 minutes
ExoClock Observations (Recent) 26 (13)
Space Observations (Recent) 26 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 0 (0)
Kepler Rp/Rs 0.10691 ± 0.00018
TESS Rp/Rs 0.1068 ± 0.0012

K2-121b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
K2-121b (LOW)
2023-04-07		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571M / R / 120.0		3.82 ± 2.45
K2-121b (LOW)
2023-04-07		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / Lum / 120.0		1.09 ± 1.73
K2-121b (LOW)
2023-04-07		David Molina
Anunaki Observatory Z51		Schmidt Cassegrain
SBIG ST-9xe / R / 120.0		-1.79 ± 1.73
K2-121b (LOW)
2023-04-07		Robert Roth
TURMX Observatory		Planewave CDK17
QHY600M / Lum / 120.0		-1.83 ± 1.08
K2-121b (LOW)
2023-02-15		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / Lum / 180.0		1.13 ± 1.73
K2-121b (LOW)
2023-02-15		Thomas Mollier
Tomastro		Newtonian
ZWO ASI1600MMC / rpr / 120.0		-1.31 ± 2.02
K2-121b (LOW)
2023-02-15		Pavel Pintr
Horní Halže		Celestron 235/1480
ASI ZWO 1600 MONO / Clear / 120.0		-1.6 ± 4.18
K2-121b (LOW)
2023-02-15		Marc Serrau
A77 Dauban		Celestron 11
QHY268 Mono / rpr / 180.0		-3.33 ± 1.87
K2-121b (LOW)
2023-02-09		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 180.0		3.8 ± 1.73
K2-121b (LOW)
2023-02-09		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		0.92 ± 1.58
K2-121b (LOW)
2023-02-09		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 90.0		-2.39 ± 2.45
K2-121b (LOW)
2023-02-09		Marco Stefanini
Osservatorio Aldebaran		Ritchey-Chretien Altair Astro
Atik 4000 LE / Lum / 250.0		-3.25 ± 2.88
K2-121b (LOW)
2023-02-09		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 250.0		-3.68 ± 2.45
K2-121b (LOW)
2022-02-11		Dominique DANIEL
La Montjoie		Celestron CGX C8 XLT
Camera CMOS ZWO ASI294MC pro (color) / Clear / 235.0		4.56 ± 4.32
K2-121b (LOW)
2022-02-11		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
FLI Kepler CMOS 4040 / Lum / 120.0		0.38 ± 1.58
K2-121b (LOW)
2022-02-06		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0		0.03 ± 0.86
K2-121b (LOW)
2022-01-22		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
FLI Kepler CMOS 4040 / Lum / 120.0		2.13 ± 1.15
K2-121b (LOW)
2022-01-22		Robert Roth
TURMX Observatory		Planewave CDK17
QHY600M / rpr / 120.0		-0.03 ± 1.3
K2-121b (LOW)
2022-01-22		Jean-Bernard Pioppa
La Roque-Esclapon		KEPLER
ATIK 383 L+ / R / 300.0		-3.34 ± 2.3
K2-121b (LOW)
2022-01-16		Cyrille Aumasson
observatory of Baronnies Provençales		ASTELCO 31.5"
FLI PL230 / R / 120.0		4.08 ± 1.58
K2-121b (LOW)
2022-01-16		Aziz Ettahar Kaeouach
High Atlas Observatory		PlaneWave CDK 12.5
Zwo asi 294 mm pro / R / 120.0		1.77 ± 3.17
K2-121b (LOW)
2022-01-16		Enrique Arce
Vallbona Observatory		Newton 10" f4
Sbig ST7-XME / Clear / 90.0		1.05 ± 2.02
K2-121b (LOW)
2022-01-16		Robert Roth
TURMX Observatory		Planewave CDK17
QHY600M / rpr / 60.0		0.19 ± 1.3
K2-121b (LOW)
2021-03-16		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge FR
ZWO ASI6200MM / rpr / 120.0		3.99 ± 1.73
K2-121b (LOW)
2021-02-13		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		0.27 ± 0.86
K2-121b (LOW)
2019-02-24		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G2 - KAF1603ME / AstrodonExoPlanet-BB / 120.0		1.7 ± 1.73

Space Observations
Planet
Observation Date		 Mission O-C
minutes
K2-121b (LOW)
2021-12-27		TESS-0.51 ± 1.58
K2-121b (LOW)
2021-12-21		TESS0.14 ± 1.58
K2-121b (LOW)
2021-12-11		TESS1.44 ± 2.02
K2-121b (LOW)
2021-12-06		TESS3.97 ± 1.58
K2-121b (LOW)
2021-12-01		TESS0.88 ± 1.58
K2-121b (LOW)
2021-11-26		TESS1.96 ± 2.02
K2-121b (LOW)
2021-11-15		TESS-1.63 ± 1.58
K2-121b (LOW)
2021-11-10		TESS2.05 ± 2.3
K2-121b (LOW)
2021-11-05		TESS2.67 ± 1.41
K2-121b (LOW)
2021-10-31		TESS-1.4 ± 1.58
K2-121b (LOW)
2021-10-20		TESS-0.45 ± 1.31
K2-121b (LOW)
2021-10-15		TESS-0.16 ± 1.73
K2-121b (LOW)
2018-06-25		K20.11 ± 0.26
K2-121b (LOW)
2018-06-20		K2-0.25 ± 0.65
K2-121b (LOW)
2018-06-14		K2-0.4 ± 0.3
K2-121b (LOW)
2018-06-09		K20.08 ± 0.29
K2-121b (LOW)
2018-05-19		K2-0.19 ± 0.16
K2-121b (LOW)
2018-05-14		K21.31 ± 2.59
K2-121b (LOW)
2015-07-07		K2-1.61 ± 0.99
K2-121b (LOW)
2015-07-02		K2-1.94 ± 1.58
K2-121b (LOW)
2015-06-27		K20.2 ± 0.46
K2-121b (LOW)
2015-06-16		K2-2.27 ± 0.88
K2-121b (LOW)
2015-06-11		K20.29 ± 0.58
K2-121b (LOW)
2015-05-26		K22.07 ± 0.5
K2-121b (LOW)
2015-05-21		K20.1 ± 0.37
K2-121b (LOW)
2015-05-11		K2-0.1 ± 0.5
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