exoclock

TOI-270c (ALERT)

Discovered by: Günther et al. 2019

The Star
Simbad
GAIA
2MASS		 L 231-32
DR2 4781196115469953024
J04333970-5157222
RA 04:33:39.7202 DEC -51:57:22.436
Parallax
44.456 mas		 P.M. RA
82.944 mas/y		 P.M. DEC
-269.755 mas/y
MagV
12.617		 MagR
12.147		 MagI*
10.418		 MagJ
9.099		 MagH
8.531		 MagK
8.251
MagG
11.631		 MagGBP
12.87		 MagGRP
10.543
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458802.71623 ± 0.00038 BJDTDB
Period
5.660563 ± 1e-05 days
Transit Parameters
Günther et al. 2019
Rp/Rs
0.05825 ± 0.00079		 a/Rs
27.01 +0.6 -1.58
 i
89.53 +0.3 -0.42 deg
e
-		 ω
- deg
DepthR*
4.52 mmag		 Duration*
1.66 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Günther et al. 2019
Teff
3386.0 +137.0 -131.0 K
 Log(g)
4.88 +0.068 -0.067 cm/s2
 Fe/H
-0.17 +0.1 -0.1 dex
ExoClock Status
Observing Priority ALERT
Minimum aperture 19.46"
Total Observations (Recent) 62 (5)
O-C -31.96 ± 0.56 minutes
ExoClock Observations (Recent) 17 (5)
Space Observations (Recent) 20 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 25 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.05847 ± 0.00057

TOI-270c


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
TOI-270c (ALERT)
2025-12-29		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 90.0		-41.68 ± 1.32
TOI-270c (ALERT)
2025-12-12		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 60.0		-38.77 ± 8.21
TOI-270c (ALERT)
2025-11-25		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 60.0		-21.22 ± 5.04
TOI-270c (ALERT)
2025-11-08		Karolina Prucnal
DeepSkyChile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 180.0		-35.49 ± 2.16
TOI-270c (ALERT)
2025-02-15		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-41.67 ± 0.95
TOI-270c (ALERT)
2024-09-15		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 60.0		-23.45 ± 3.31
TOI-270c (ALERT)
2024-08-12		Karolina Prucnal
DeepSkyChile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 60.0		-25.07 ± 1.73
TOI-270c (ALERT)
2024-08-12		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-27.08 ± 2.3
TOI-270c (ALERT)
2024-01-27		Magdalena Szkudlarek
Deep Sky Chile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 70.0		-9.08 ± 1.87
TOI-270c (ALERT)
2024-01-27		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 60.0		-10.8 ± 2.16
TOI-270c (ALERT)
2024-01-27		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-16.42 ± 3.02
TOI-270c (ALERT)
2023-12-24		Magdalena Szkudlarek
Deep Sky Chile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 75.0		-11.87 ± 1.11
TOI-270c (ALERT)
2023-12-24		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-12.56 ± 1.35
TOI-270c (ALERT)
2023-12-07		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-12.72 ± 3.74
TOI-270c (ALERT)
2023-12-07		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 90.0		-13.59 ± 1.87
TOI-270c (ALERT)
2023-12-07		MARIA STRATIGOU-PSARRA
Deep Sky Chile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 75.0		-18.05 ± 4.46
TOI-270c (ALERT)
2023-09-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-15.09 ± 2.45

Space Observations
Planet
Observation Date		 Mission O-C
minutes
TOI-270c (ALERT)
2020-12-15		TESS9.59 ± 1.73
TOI-270c (ALERT)
2020-12-09		TESS8.51 ± 1.07
TOI-270c (ALERT)
2020-12-04		TESS9.21 ± 1.31
TOI-270c (ALERT)
2020-11-28		TESS8.13 ± 1.11
TOI-270c (ALERT)
2020-11-22		TESS8.57 ± 1.11
TOI-270c (ALERT)
2020-10-14		TESS10.93 ± 0.91
TOI-270c (ALERT)
2020-10-08		TESS8.13 ± 0.96
TOI-270c (ALERT)
2020-10-02		TESS8.71 ± 1.44
TOI-270c (ALERT)
2020-09-27		TESS9.48 ± 1.05
TOI-270c (ALERT)
2018-12-10		TESS2.95 ± 1.44
TOI-270c (ALERT)
2018-12-04		TESS6.73 ± 0.78
TOI-270c (ALERT)
2018-11-29		TESS4.59 ± 0.89
TOI-270c (ALERT)
2018-11-23		TESS5.34 ± 1.22
TOI-270c (ALERT)
2018-11-17		TESS5.68 ± 0.76
TOI-270c (ALERT)
2018-11-12		TESS5.28 ± 1.73
TOI-270c (ALERT)
2018-11-06		TESS8.68 ± 1.07
TOI-270c (ALERT)
2018-10-26		TESS6.04 ± 1.11
TOI-270c (ALERT)
2018-10-20		TESS8.38 ± 1.58
TOI-270c (ALERT)
2018-10-09		TESS9.65 ± 0.73
TOI-270c (ALERT)
2018-09-27		TESS10.7 ± 1.25

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2021-01-01 Kaye et al. 2022 3.93 ± 1.61
2020-10-25 Kaye et al. 2022 9.23 ± 0.42
2020-06-05 Kaye et al. 2022 7.81 ± 1.53
2020-05-25 Kaye et al. 2022 0.9 ± 2.88
2020-05-20 Kaye et al. 2022 4.77 ± 1.63
2020-01-10 Kaye et al. 2022 0.24 ± 0.19
2020-01-05 Kaye et al. 2022 -0.14 ± 0.22
2019-12-24 Kaye et al. 2022 -1.18 ± 0.2
2019-12-07 Kaye et al. 2022 -1.49 ± 0.27
2019-12-02 Kaye et al. 2022 -3.8 ± 1.84
2019-11-15 Kaye et al. 2022 -2.97 ± 0.52
2019-11-09 Kaye et al. 2022 -1.97 ± 0.96
2019-11-09 Kaye et al. 2022 -2.59 ± 0.5
2019-11-03 Kaye et al. 2022 -1.76 ± 0.48
2019-10-23 Kaye et al. 2022 -6.29 ± 1.38
2019-10-17 Kaye et al. 2022 -4.49 ± 0.58
2019-09-30 Kaye et al. 2022 -4.08 ± 0.45
2019-09-13 Kaye et al. 2022 -3.38 ± 0.81
2019-09-02 Kaye et al. 2022 -5.06 ± 0.52
2019-09-02 Kaye et al. 2022 -6.88 ± 0.96
2019-07-30 Kaye et al. 2022 -5.36 ± 1.22
2019-04-19 Kaye et al. 2022 -2.76 ± 0.26
2019-03-28 Kaye et al. 2022 0.16 ± 2.15
2019-01-07 Kaye et al. 2022 0.25 ± 0.62
2018-12-10 Kaye et al. 2022 2.07 ± 0.48
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