exoclock

NGTS-8b (LOW)

Discovered by: Costes et al. 2020

The Star
Simbad
GAIA
2MASS		 NGTS-8
DR2 6840435777723109888
J21555419-1404062
RA 21:55:54.1981 DEC -14:04:06.225
Parallax
2.303 mas		 P.M. RA
21.363 mas/y		 P.M. DEC
-10.194 mas/y
MagV
13.72		 MagR
13.53		 MagI*
12.78		 MagJ
12.14		 MagH
11.751		 MagK
11.642
MagG
13.495		 MagGBP
13.961		 MagGRP
12.878
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459657.40829 ± 0.00041 BJDTDB
Period
2.4996862 ± 1.1e-06 days
Transit Parameters
Costes et al. 2020
Rp/Rs
0.114 ± 0.002		 a/Rs
7.6 +0.18 -0.18
 i
86.9 +0.5 -0.5 deg
e
-		 ω
- deg
DepthR*
16.88 mmag		 Duration*
2.61 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Costes et al. 2020
Teff
5241.0 +50.0 -50.0 K
 Log(g)
4.41 +0.03 -0.03 cm/s2
 Fe/H
0.24 +0.09 -0.09 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 9.54"
Total Observations (Recent) 33 (10)
O-C 2.76 ± 0.36 minutes
ExoClock Observations (Recent) 32 (10)
Space Observations (Recent) 0 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs -

NGTS-8b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
NGTS-8b (LOW)
2025-08-27		Jean-Charles Ripault
HRT Observatory		Astrosib RC360
Moravian C3-61000 / R / 300.0		5.83 ± 2.88
NGTS-8b (LOW)
2025-08-27		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		1.59 ± 1.27
NGTS-8b (LOW)
2025-08-17		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		2.72 ± 0.99
NGTS-8b (LOW)
2025-08-12		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		3.07 ± 1.28
NGTS-8b (LOW)
2025-08-07		Jean-Charles Ripault
HRT Observatory		Astrosib RC360
Moravian C3-61000 / R / 30.0		12.88 ± 2.16
NGTS-8b (LOW)
2025-08-07		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		4.09 ± 1.58
NGTS-8b (LOW)
2025-07-08		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 90.0		4.28 ± 1.58
NGTS-8b (LOW)
2025-07-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		2.6 ± 1.07
NGTS-8b (LOW)
2025-07-03		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 90.0		3.88 ± 1.21
NGTS-8b (LOW)
2025-06-20		Felix Laureano La Puerta
Siding Spring Observatory		PlaneWave Delta Rho 350
QHY600 CMOS / rpr / 180.0		2.71 ± 1.37
NGTS-8b (LOW)
2024-07-28		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		0.25 ± 1.73
NGTS-8b (LOW)
2024-07-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		0.6 ± 1.58
NGTS-8b (LOW)
2024-07-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		2.82 ± 1.73
NGTS-8b (LOW)
2024-07-08		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 120.0		2.13 ± 1.09
NGTS-8b (LOW)
2024-07-08		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / Lum / 120.0		-1.78 ± 1.73
NGTS-8b (LOW)
2024-07-03		Sacha Foschino
Deep Sky Chile		RASA 14
ZWO ASI 6200 MM Pro / R / 120.0		3.07 ± 2.16
NGTS-8b (LOW)
2023-11-18		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		0.98 ± 4.61
NGTS-8b (LOW)
2023-10-04		Mercedes Correa
Montsec Observatory		RC 80 cm
iKON XL / R / 120.0		-6.44 ± 1.87
NGTS-8b (LOW)
2023-09-29		Mercedes Correa
Montsec Observatory		RC 80 cm
iKON XL / R / 120.0		0.43 ± 3.17
NGTS-8b (LOW)
2023-06-29		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / Lum / 120.0		2.87 ± 1.73
NGTS-8b (LOW)
2023-06-29		Georgina Farrall
Deep Sky Chile		PlaneWave CDK 17"
Moravian 4G / Lum / 180.0		2.39 ± 1.31
NGTS-8b (LOW)
2023-06-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		0.6 ± 0.88
NGTS-8b (LOW)
2023-06-14		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / Lum / 120.0		-1.43 ± 2.02
NGTS-8b (LOW)
2023-06-14		Francois Regembal
HRT Deep Sky Chile		Astrosib RC360
Moravian C3 PRO 61000 / Lum / 180.0		-4.31 ± 2.16
NGTS-8b (LOW)
2023-05-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-1.13 ± 1.25
NGTS-8b (LOW)
2023-05-30		Gregory Grivas
Cerro Tololo Observatory		LCO Meade
SBIG STX6303 / rpr / 240.0		-1.26 ± 1.73
NGTS-8b (LOW)
2022-10-14		Vincent Boucher
Observatoire de Saint-Véran Paul Felenbok		Astrosib RC500
SBIG STX-16803 / Lum / 180.0		3.41 ± 1.58
NGTS-8b (LOW)
2022-10-14		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		-0.33 ± 2.02
NGTS-8b (LOW)
2022-10-14		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		-0.62 ± 4.61
NGTS-8b (LOW)
2022-10-04		Marc Serrau
A77 Dauban		Celestron 11
QHY268 Mono / Clear / 60.0		0.31 ± 1.73
NGTS-8b (LOW)
2022-10-04		Jacques Michelet
Claix		GSO Ritchey-Chrétien
QSI-632 / R / 120.0		-4.3 ± 2.74
NGTS-8b (LOW)
2022-09-24		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		-0.92 ± 3.6

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2016-04-21 Costes et al. 2020 -0.01 ± 1.04
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