| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
XO-4 DR2 990291507088739072 J07213317+5816051 |
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| RA | 07:21:33.1602 | DEC | +58:16:05.111 | ||
| Parallax 3.639 mas |
P.M. RA -16.989 mas/y |
P.M. DEC 5.31 mas/y |
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| MagV 10.81 |
MagR* 10.322 |
MagI* 10.239 |
MagJ 9.667 |
MagH 9.476 |
MagK 9.406 |
| MagG 10.513 |
MagGBP 10.778 |
MagGRP 10.117 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
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|---|---|---|---|---|---|
| Kokori et al. 2022 | |||||
| Mid-time 2456878.47303 ± 0.00023 BJDTDB |
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| Period 4.12506679 ± 4.8e-07 days |
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| Transit Parameters | |||||
| Narita et al. 2010 | |||||
| Rp/Rs 0.0881 ± 0.0007 |
a/Rs 7.68 +0.11 -0.11 |
i 88.8 +0.6 -0.6 deg |
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| e - |
ω - deg |
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| DepthR* 10.15 mmag |
Duration* 4.43 hours |
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|
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations. |
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| Limb Darkening Parameters | |||||
| McCullough et al. 2008 | |||||
| Teff 6397.0 +70.0 -70.0 K |
Log(g) 4.18 +0.07 -0.07 cm/s2 |
Fe/H -0.04 +0.03 -0.03 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | MEDIUM | ||||
| Minimum aperture | 5.0" | ||||
| Total Observations (Recent) | 42 (1) | ||||
| O-C | -3.12 ± 0.97 minutes | ||||
| ExoClock Observations (Recent) | 20 (1) | ||||
| Space Observations (Recent) | 5 (0) | ||||
| ETD Observations (Recent) | 1 (0) | ||||
| Literature Mid-times (Recent) | 16 (0) | ||||
| Kepler Rp/Rs | - | ||||
| TESS Rp/Rs | 0.08651 ± 0.00041 | ||||
ExoClock Observations |
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| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| XO-4b (MEDIUM) 2024-04-04 | Giovanni Calapai Home Astronomical Observatory | Celestron 11 Schmidt-Cassegrain Atik 314L+ / Clear / 90.0 | -3.08 ± 2.16 | |
| XO-4b (MEDIUM) 2023-03-05 | Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81) | Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 30.0 | -1.76 ± 1.87 | |
| XO-4b (MEDIUM) 2023-03-05 | Eric Miny BLOIS SOLOGNE ASTRONOMIE OBSERVATORY | Newton T305 QSI 683WS / Lum / 60.0 | -5.51 ± 2.45 | |
| XO-4b (MEDIUM) 2023-01-31 | Marco Stefanini Osservatorio Aldebaran | Ritchey-Chretien Altair Astro Atik 4000 LE / Lum / 250.0 | -2.72 ± 4.03 | |
| XO-4b (MEDIUM) 2023-01-03 | Pieter Vuylsteke TheGardenToTheSkyFacility | TS ONTC 25cm f4.7 QHY 268M / rpr / 60.0 | -3.2 ± 1.73 | |
| XO-4b (MEDIUM) 2022-03-07 | Mark Salisbury POST | Orion Optics ODK SBIG ST-10 XME / R / 100.0 | -0.5 ± 1.15 | |
| XO-4b (MEDIUM) 2022-02-11 | Kevin Johnson Holbrook Observatory | Meade LX10 EMC Atik 383L+ / R / 50.0 | 0.65 ± 2.3 | |
| XO-4b (MEDIUM) 2022-02-02 | Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81) | Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 90.0 | 1.86 ± 2.16 | |
| XO-4b (MEDIUM) 2021-12-31 | Fran Campos Puig d'Agulles Observtory | RC14" on EQ8 German mount SBIG ST-8XME / R / 60.0 | 5.5 ± 1.3 | |
| XO-4b (MEDIUM) 2021-01-11 | Yves Jongen Rasteau Observatory | Plane Wave CDK 17" SBIG STXL 11002 / R / 120.0 | -1.34 ± 1.58 | |
| XO-4b (MEDIUM) 2020-11-06 | Adrian Jones Private Observatory (I64) | Meade ACF 30cm QSI 583 / R / 30.0 | -2.83 ± 4.32 | |
| XO-4b (MEDIUM) 2020-11-02 | Alberto Tomatis Alto-Observatory | RC STL 6303 / Lum / 60.0 | 3.17 ± 3.17 | |
| XO-4b (MEDIUM) 2020-10-28 | Martin Crow Burnham Observatory | Celestron C9.25 SX694 mono / R / 15.0 | 0.24 ± 4.32 | |
| XO-4b (MEDIUM) 2020-03-11 | Nikolaos Paschalis Nunki Observatory | Officina Stellare RILA 400 SBIG STXL 11002 / R / 60.0 | 2.32 ± 2.02 | |
| XO-4b (MEDIUM) 2020-03-11 | Alessandro Nastasi Galhassin Robotic Telescope 1 (GRT1) | Officina Stellare RiLa 400 FLI ProLine 16803 / R / 45.0 | 1.6 ± 2.16 | |
| XO-4b (MEDIUM) 2020-03-11 | Danilo Sedita Osservatorio Sedita Castrofilippo | RC GSO 14" Moravian G2-1600 / R / 30.0 | 0.3 ± 1.44 | |
| XO-4b (MEDIUM) 2020-02-07 | Mauro Caló Cavallino | RC SBIG ST10 / R / 60.0 | -2.24 ± 4.32 | |
| XO-4b (MEDIUM) 2020-02-03 | Tõnis Eenmäe Tartu Observatory | Planewave CDK 12.5 Apogee Alta U42 / R / 30.0 | 1.89 ± 0.86 | |
| XO-4b (MEDIUM) 2020-01-05 | Pere Guerra Observatori Astronòmic Albanyà | 16" Meade ACF F8 Moravian G4-9000 / I / 120.0 | 0.4 ± 1.87 | |
| XO-4b (MEDIUM) 2020-01-05 | Yves Jongen Rasteau Observatory | Plane Wave CDK 17" SBIG STXL 11002 / V / 120.0 | -1.47 ± 1.73 | |
Space Observations |
||||
| Planet Observation Date |
Mission | O-C minutes |
||
| XO-4b (MEDIUM) 2020-01-18 | TESS | -1.18 ± 0.86 | ||
| XO-4b (MEDIUM) 2020-01-14 | TESS | -0.86 ± 0.81 | ||
| XO-4b (MEDIUM) 2020-01-09 | TESS | -0.39 ± 0.81 | ||
| XO-4b (MEDIUM) 2020-01-05 | TESS | -0.58 ± 0.78 | ||
| XO-4b (MEDIUM) 2020-01-01 | TESS | 0.41 ± 0.71 | ||
ETD Observations |
||||
| Planet Observation Date |
Observer(s) | ETD link | O-C minutes |
|
| XO-4b (MEDIUM) 2020-03-16 | Anaël Wünsche | 1584328042 | 0.64 ± 1.87 | |
Literature Mid-times |
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| Planet Observation Date |
Reference | O-C minutes |
||
| 2012-01-07 | Villanueva et al. 2016 | 2.97 ± 1.3 | ||
| 2010-03-18 | Villanueva et al. 2016 | 4.83 ± 1.73 | ||
| 2010-02-09 | Narita et al. 2010 | 1.56 ± 0.94 | ||
| 2010-02-09 | Villanueva et al. 2016 | -1.31 ± 1.05 | ||
| 2009-12-05 | Villanueva et al. 2016 | -4.15 ± 2.16 | ||
| 2009-11-10 | Villanueva et al. 2016 | 1.47 ± 1.44 | ||
| 2009-09-05 | Narita et al. 2010 | 4.02 ± 1.58 | ||
| 2009-02-11 | Villanueva et al. 2016 | -2.69 ± 2.74 | ||
| 2009-01-17 | Villanueva et al. 2016 | -2.69 ± 4.03 | ||
| 2009-01-13 | Todorov et al. 2012 | 1.87 ± 0.86 | ||
| 2009-01-09 | Todorov et al. 2012 | -0.34 ± 1.15 | ||
| 2008-12-11 | Todorov et al. 2012 | -3.12 ± 1.01 | ||
| 2008-11-12 | Villanueva et al. 2016 | 4.18 ± 1.73 | ||
| 2008-10-10 | Narita et al. 2010 | 1.62 ± 1.64 | ||
| 2008-10-06 | Narita et al. 2010 | 2.07 ± 1.51 | ||
| 2008-01-20 | McCullough et al. 2008 | -1.86 ± 0.58 | ||