drop in R
Main body (Chariklo)
there is a nearby star with almost the same magnitude of the
If they are merged, the magnitude drop in R will be of only ~0.25.
*Absolute time accuracy is essential**
to connect all the observations together
after the fact. Check
the time of your computer with many sources (phone talked
hour, different internet sites, ideally with a GPS). Its advised
to check the registered time right after and right before the
integrations, so if there is a drift, we can correct it by having
Beware of the dead time
between the images: if you manage an exposure time of 1
sec (for example), but have your camera takes 2 sec to read the
image, then there is a 67% chance that you miss the
dis(re)-appearance of the star. So it's better to have, for
example, a 4 sec integration, so you have 67% chance to get the
occultation in one of your exposures.
Prediction is based on preliminary GAIA DR2 (i) star position with
an accuracy of ~0.3 miliarcsec, considering proper motion and
Chariklo's NIMAv11 (ii) ephemeris with an accuracy of ~5 mas.
This corresponds to an error of
around 80 km on the shadow path,
about a third of Chariklo diameter.
GAIA DR2 (i)
and the latest
an accuracy of
~2 mas, that
around 20 km
on the shadow
path, and 1.5
sec in time.
the KMZ file
on July 13)
see the observation tips at the top!