## **This is the second Data Release from the ExoClock project!**
Data for individual observations or planets can be found through the ExoClock website
[https://exoclock.space/drb](https://www.exoclock.space/drb)
but the complete database can be accessed through the Open Science Framework under the DOI:
[https://10.17605/OSF.IO/WNA5E](https://www.doi.org/10.17605/OSF.IO/WNA5E)
## **In this database you will find**
#### **Catalogue of ExoClock Observations**
The Catalogue of ExoClock Observations contains 1604 transit observations for 180 extra solar planets. These are all the observations that were acquired, submitted to the ExoClock website and validated until the 31st of Deceber 2020. Information for individual observations can be accessed via the observation’s dedicated page on the ExoClock website, e.g.
[https://exoclock.space/database/observations/CoRoT-2b_loufas_NOAK_Observatory_SKYWATCHER_2019-07-08/](https://www.exoclock.space/database/observations/CoRoT-2b_loufas_NOAK_Observatory_SKYWATCHER_2019-07-08/)
The open observations are indicated with the label “data available” either on the general database page on the ExoClock website
[https://exoclock.space/database/observations](https://www.exoclock.space/database/observations)
or on the planet’s dedicated page on the ExoClock website, e.g.
[https://exoclock.space/database/planets/CoRoT-2b](https://www.exoclock.space/database/planets/HAT-P-20b)
#### **Catalogue of ExoClock Ephemerides**
The Catalogue of ExoClock Ephemerides contains the list of updated ephemerides for 180 exoplanets. The updated ephemerides are indicated with a green check icon on the general database page on the Ephemerides & Planet information page on the ExoClock website:
[https://exoclock.space/database/planets](https://www.exoclock.space/database/planets)
#### **Extra data sources**
In the Data Release B you can also find the analysis results for 18 observations linked from ETD. Information for individual observations can be accessed via the observation’s dedicated page on the ExoClock ebsite, e.g.
[https://www.exoclock.space/database/etd/1575886219/](https://www.exoclock.space/database/etd/1575886219/)
The complete collection can be found here:
[https://www.exoclock.space/database/etd](https://www.exoclock.space/database/etd)
Finally, Data Release B contains 2356 mid-time data points collected from the literature. You can find the complete collection here:
[https://www.exoclock.space/database/literature](https://www.exoclock.space/database/literature)
#### **Updated Exoplanet Characterisation Catalogue**
The Exoplanet Characterisation Catalogue contains parameters for the 370 known planets and their host stars that are now potential Ariel targets. Information for individual planets can also be accessed via the planet’s dedicated page on the ExoClock website, e.g.
[https://exoclock.space/database/planets/HAT-P-20b](
https://exoclock.space/database/planets/HAT-P-20b)
## **Publications**
For more details see our publications below, which you will need to cite if you are using the ExoClock database for your work.
**Thank you!**
1. [Kokori, A., Tsiaras, A., Edwards, B. et al. 2021. ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides. The Astrophysical Journal Supplement Series (Under review)](
https://ui.adsabs.harvard.edu/abs/2020arXiv201207478K/abstract)
2. [Kokori, A., Tsiaras, A., Edwards, B. et al. 2021. ExoClock project: an open platform for monitoring the ephemerides of Ariel targets with contributions from the public. Experimental Astrononmy (published).](
https://doi.org/10.1007/s10686-020-09696-3)
