I'm partial to something like the Cobra Mk III for exploration as well, but it depends on the type of exploration you're after. Anyway, an AFMU, shields, some decent thrusters and some SRVs if you're wanting to land on worlds, A rated power supply to keep heat buildup down, maybe a heat sink launcher or two, the biggest FSD you can get, a Guardian jump booster, FSD range boost materials, a big fuel scoop as mentioned by others. That sort of thing.
I generally don't bother with maybe half of what some explorers might care to take with them, but they're there for the taking if you have the inclination.
For pretty much everything else, go with D rated with enough functionality for your needs to help keep the mass down.
Of course you can improve pretty much all of this to some extent with Engineering. Things like Engineering lighter weight sensors, especially for the Anaconda I hear, naturally your FSD for further jump range, and so on.
If you're looking to sell mined ores and exploration data in a specific place inside the bubble, you may have some troubles with NPCs. Likely something that would be survivable, but mistakes happen and we aren't always on our ace game. Personally, I like popping would-be trouble makers when my exploration loadout needs for a given type of exploration and ship can also support the arms, but this isn't generally advised for the PVE meta as it's often less risky to avoid and evade as needed instead of engaging, unless maybe you're one of the more PVP oriented players doing the advising, or just care to approach the game a bit differently like me. Anyway, point being, you can always sell data on the fringes and the like too.
Oh, also after the countdown to jump starts, throttle back down before jumping to white dwarf, neutron star, and black hole systems so you don't accidentally crash into their exclusion zones and take damage. If you find yourself in a pickle looking for fuel from scoopable stars (likely not much of an issue with an Anaconda) or just want to avoid certain star types for whatever reason, you can always select the star types you'd prefer and the checkbox to apply it to your plotted route on the galactic map UI. Scoopable star types are O, B, A, F, G, K, M.
For some virgin space, heading out toward the Skull & Crossbones nebula a few thousand Lys should suffice, as there's not all that much out that way for points of interest, so it generally gets less traffic.
Cheers.