Static class as enum of objects

    public interface IPlanetType
    {
        string Name { get; set; }

        int BaseTemperature { get; set; }

        int BaseHabitat { get; set; }

        int BaseFertility { get; set; }
    }

    public static class PlanetTypes
    {
        class PlanetType : IPlanetType
        {
            string name;

            public string Name
            {
                get { return name; }
                set { name = value; }
            }

            int baseTemperature;

            public int BaseTemperature
            {
                get { return baseTemperature; }
                set { baseTemperature = value; }
            }

            int baseHabitat;

            public int BaseHabitat
            {
                get { return baseHabitat; }
                set { baseHabitat = value; }
            }

            int baseFertility;

            public int BaseFertility
            {
                get { return baseFertility; }
                set { baseFertility = value; }
            }
        }

        public static IPlanetType Arctic = new PlanetType
        {
            BaseFertility = 0,
            BaseHabitat = 2,
            BaseTemperature = -60
        };

        public static IPlanetType Desert = new PlanetType
        {
            BaseFertility = 0,
            BaseHabitat = 2,
            BaseTemperature = 60
        };

        public static IPlanetType Tundra = new PlanetType
        {
            BaseFertility = 1,
            BaseHabitat = 4,
            BaseTemperature = -30
        };

        public static IPlanetType Arid = new PlanetType
        {
            BaseFertility = 1,
            BaseHabitat = 4,
            BaseTemperature = 30
        };

        public static IPlanetType Terran = new PlanetType
        {
            BaseFertility = 2,
            BaseHabitat = 8,
            BaseTemperature = 0
        };
    }

    public class Planet
    {
        public Planet()
        {
            type = PlanetTypes.Terran;
        }

        double gravity;

        public double Gravity
        {
            get { return gravity; }
            set { gravity = value; }
        }

        int size;

        public int Size
        {
            get { return size; }
            set { size = value; }
        }

        IPlanetType type;

        public IPlanetType Type
        {
            get { return type; }
            set { type = value; }
        }
    }