Ephemerides & Planet information

• The list includes only the observable targets for ARIEL (Edwards et al. 2019).
• All T₀ values have been transformed from their original published time basis to BJD_TDB.
• If not clearly stated in the paper, the time basis of the published version is assumed to be UTC.
• When the time basis of the published version is TT, it is assumed to be equal to TDB (the maximum difference is 3.4 ms).
• In cases of asymmetric uncertainties, the largest one is used.

From python type:
```
import urllib
import json

exoclock_planets = json.loads(urllib.request.urlopen('https://www.exoclock.space/database/planets_json').read())
```

This will give you a python dictionary with all the planets and for each planet the following information:
'name': planet name
'priority': alert, high, medium or low
'total_observations': total number of observations on exoclock
'recent_observations': number of recent observations on exoclock (last 6 months)
'ra_j2000': star RA
'dec_j2000': star DEC
'v_mag': star Vmag
'r_mag': star Rmag
'gaia_g_mag': star Gmag
'depth_mmag': transit depth in millimag
'duration_hours': transit duration in hours
't0_bjd_tdb': ephemeris mid_time in BJD_TDB
't0_unc': ephemeris mid_time uncertainty
'period_days': ephemeris period in days
'period_unc': ephemeris period uncertainty
'current_oc_min': deviation from the ephemeris based on the current observations
'min_telescope_inches': minimmum size of telescope required to observe this planet in inches