multiple enemy owned planets
size-type-availability-attack/def
massive-irradiated-18x mega rich mining-80k attack/4k def
massive-plasma-ultra rich research-2k attack/32k def
massive-demon-ultra rich mining-6k attack/6k def
massive-oceanic-ultra rich artifact-0 attack/68k def
very massive-metallic-extremely rich research-3k attack/9k def
massive-metallic-very rich mining-800 attack/400 def
Multiple unoccupied planets
size-type-availability
massive-oceanic-rich research
massive-gas-rich research
massive-metallic-rich mining
very large-metallic-very rich mining
large-metallic-extremely rich mining
large-volcanic-extremely rich mining
best offer at end of the week will get the planet
YCTM at night shade assassin or ICTY for a fee of 50 CTP for unoccupied and 150 CTP for enemy owned

Sorry to say, but I think no one will buy these planets.

they might buy the enemy owned planets

Unlikely. I doubt most people would invade them if they scanned them themselves, let alone pay someone else to let them invade.

well i have already sold a enemy owned planet for 6k ctp

But you didn't sell any of these planets for that price. Best sellers are Artifact planets or planets with effects like Stealth Screen, Rings, Moons, etc. Mining and Research planets can be created very rapidly if you npc at all so the values of these regular planets is very little.

what planet did you sell ?
If it was similar to these planets above, then wow I would have 1 mil CTP.

a massive gaia 15x artifact

If they came to you that isn't so bad of a deal, but if you are traveling you could get about 2x that price next time.

I am traveling but i don't mind the low price

6k ctp eww i sure would of paid more for that for sure and there is allot of us who would of dove on that if you would of placed it up for auction you could of cleared allot more ctp for the planet

the thing with traveling with an enemy planet is you have to sit there for quite a while. for those of us with loyalty, that pretty much means an extra 2-3 rounds of LM. If you don't have loyalty anyways, it might cost a bit less but you are still going to be away for an extra week.
Now, you do get to receive shipment in your temp base after just a day, so if the buyer is in a decent legion, you won't miss out much in that and legion def bonus. I'd charge a sur-charge if it's a smaller legion as it places my planets in risk and smaller shipments are.... smaller.
CTL isn't an issue as I tend to be well supplied before traveling. This about sums up the cost of traveling operation

As for OP's planet, one planet remotely worth buying would be the MUR arti. But it's not that good for high end player and a bit tough for the low. It's also not expandable and not worth uplifting. It'd sell for very little and then there is the travel issue. It might sell to some mid-range player who are already traveling around for whatever reason, that's about it.

The other would be the 18x M mining. While mining planets are easily mass produced, 18x M is still somewhat special. It's not worth that much, certainly nowhere near artifact planets, but it can sell. You might wanna list any valuable planet structures/effects it might have, as 18x M sometimes have a few. Thou only the valuable ones as to not give up too much information.

Other than those two thou.... bunch of *beep* really.

On another note, you are a bit too explicit in the atk/def revelation. I would display, instead, an estimate amount of invasion def after debuff, rounded to the nearest power of 2's multiple of 100 (i.e. 100, 200, 400, 800, 1600, 3200....) Or whatever other method you might wanna use. the goal is give a decent estimation of invasion difficulty without revealing too much information.
In fact, I personally won't excessively reveal the type of planet it is. Quite frankly, the difference between a demon and a metallic planet is extremely marginal. The only planet type worth mentioning are the expandable and gas/plasma.