Planet uses different naming schemes for different types of images.
The following will explain how you can interpret the different IDs.
PlanetScope scene names are composed of a date, time and satellite ID number. In certain instances they may also have a unique identifier.
20151027_120254_0b1f is composed of
12:02:54 (UTC time) and
0b1f (satellite ID).
In cases where two images were captured in the same second, an extra uniquely-identifying counter is added to distinguish between the images.
20151027_145652_1_0b0d is composed of
14:56:52 (UTC time),
1 (counter) and
0b0d (satellite ID).
RapidEye images are composed of a date, time, tile ID number and a satellite ID number.
20150920_025548_5150424_RapidEye-3 is from
02:55:48 (UTC time),
5150424 (tile ID) and
RapidEye-3 (satellite ID).
The tile ID that is part of the RapidEye file name corresponds to the
rapideye.tile_id element in the scene metadata. If you wish to locate the tile ID number spatially, there is a reference Shapefile and KML files on the RapidEye website: http://blackbridge.com/
Landsat images use the original naming scheme devised by the USGS, which can be found here.