A few predictions about this event:
1. The surface of the comet will be solid rock.
2. The surface will either be entirely devoid of ice or it will have a very light frosting of ice in small pockets.
3. Image sensors will detect areas of whiteout if the comet is active. This whiteout will be caused by plasma discharges. Should the landing be successful, it’s possible that the lander may directly image plasma electrically machining the rocky surface of the comet.
4. The surface will be heavily cratered, with sharply defined ridges and mesas.
5. The lander may short out or explode as it approaches the comet. It’s possible that a massive explosion could occur if a large electrical exchange were to take place between the lander and the comet.
6. The Rosetta lander Magnetometer And Plasma monitor (ROMAP) sensor will go haywire or produce completely unexpected results.
7. No “water” jets will be pinpointed, but OH blooms will be identified to be coming from the ridges of craters and from areas of whiteout on the image sensors. There will be no observed large scale photodissociation of water, as is presumed by standard comet models. OH production will be wildly out of proportion to observed H production.
8. The surface will be blackened and charred from electrical scaring. It will have the albedo of asphalt.
9. The CONSERT (COmet Nucleus Sounding Experiment by Radiowave Transmission) sensor will return data consistent with a solid piece of rock, not a hollow snowball.
10. Other sensors will return data consistent with the comet being made up entirely of typical terrestrial rock, devoid of interior ice, discharging an electrically charged plasma coma around the nucleus.