Were it up to me (& obviously it isn't), the exploration would go something like this:
1. Jump into the system & "honk" (same as now).
2. Honking will do several things-(a) give the player the emission/gravity data mentioned in the OP, (b) reveal detailed scans of all objects within x light-seconds of your ship, & low resolution scans of all stellar bodies within (x*y) light-seconds of your ship (which will appear in your System Map as blacked out spheres, with the probabilities for each stellar body class beneath it) & (c) bring up a number of hollow circles-of varying size-that represent the approximate positions of all the major gravity wells within the system.
3. After this point, a player has several options-(a) resolve the emission/gravity data by hand (which will hopefully be do-able from within your cockpit view), from either a sitting still or in-transit position, (b) feed emission/gravity data into your science module-if you have one-to produce a low-resolution map of the entire system, after a certain lag time or (c) begin flying towards one of the many circles on your HUD, in order to try doing a active secondary scan on the stellar body.
4. If you choose (c), then once you believe you are within range, you can attempt a secondary active scan, which will provide a detailed scan of all stellar bodies within range of your scanner. The range at which this active scan will work would be further away than the range at which the current passive scan kicks in. This secondary scan will also grant additional low-resolution scans of any planets that are no more (x*y) light-seconds away from your ship.
5. However the player chose to obtain their detailed surface scans, they can now choose if they want to (a) launch a probe at the stellar object or (b) use their own ship to do a high-altitude slingshot scan of the planet (difficult, dangerous......but I suspect potentially quite fun

).
6. In all likelihood, any option other than 3(a) will probably result in slightly fewer credits/experience.
Just a shame that I can't remember if I posted this before now, in this level of detail, so don't know if Adam will see it! Oh well, still worth posting.