I'm trying to build a super Earth that's capable of sustaining human life for space exploration in a way that's close to reality. So far I'm lacking some understanding of planetary science and human biology.
The premise is that the planet is a young world, around 2.7 billion years old, orbiting a K star within the shorter distance from the center of the habitable zone. It has shallow seas/lakes with a rusty green color, although the greenish hue of the color is slowly disappearing due higher concentrations of oxygen as time passes by. (This was inspired by reading research articles that suggest Earth's oceans were green with iron deposits before the great oxygenation event.)
Planet radius: 1.4
Planet mass: 2 Earths
Atmospheric composition: Nitrogen: 69%, Argon 0.82%, Oxygen 30%. Due to the higher concentration of oxygen, there are lots of negative consequences affecting the planet, such as more volcanic activity, massive forest burning, metal rusting faster, food spoiling quicker than Earth, constant rainfalls, and possible massive violent storms.
The temperature: It varies. The highest temperature I've recorded is 61°C (141°F) and the and the lowest ever measured was 10°C (50°F). The average temperature for the most part of the planet is 37°C (98°F).
Surface Gravity: I'm not sure what kind of gravity I should put. As far as I know, Earth's gravity is 9.8 m/s² (1g) but, since the planet has larger mass, the gravity characteristics differ from Earth, therefore, I'm clueless to calculate this.
Geology: Homogeneous mix of lands (smaller continents) and water that connects to different large or tiny landmasses. Instead of a large ocean, it has numerous water bodies with lots of inlets, bays, lagoons, and isthmuses. The topography is slightly flatter than on Earth.
Land coverage: 55% water and 45% land.
Orbital period and rotation: Another thing I'm at a loss for. I'm afraid I'm terrible at mathematical planetary motion but I wanted the planet to have 447 days (1.22 solar year).
Flora: Possibly a mega flora with wetlands, tall mangroves, and a rain forest.
My question would be, given everything that I listed, is possible human life could thrive on this planet? If so, what are the positive or negative side effects for humans to live there? Do humans suffer different gravity, atmosphere, weather effects? Would the inhabitants undergo disorder moods like seasonal affective disorder, since it has different lengths of days?
I figured since it has a higher concentration of oxygen, humans would perform better in endurance but I also read that with too much oxygen, long-term effects include oxygen toxicity and problems with metabolism and aging cells.
Correct me if I'm wrong in any those lists I've mentioned.