Aerated, fertilized, overseeded

Monday 9/28 evening I aerated the lawn using the tow-behind core aerator. Worked ok, not great. I think the plugs were roughly 1 inch+, in a few areas, 2 inches. I should use more weight, and/or wait for more rain before I do it next time.
Fertilized on tuesday 9/29th, with Scotts starter fertilizer. Used a bit less than recommended, as a big bag is supposed to cover 14,000 sq ft., and I only used 90% of 1.
Overseeded with Pennington's smartseed bluegrass & fescue mix. Again, used a bit less than recommended, used 2 bags, which are supposed to cover 10,000 sq ft.
Let's see what this gives in 2 weeks.

Soil test for the backyard

Took a few samples using the new Fiskars core aerator. The PH reading is between 6.0 and 6.5, and tall fescues like 6.0 to 7.0 PH. Kentucky Blue likes 6.0 to 7.5. So I guess I do not need to lime for now.

Here's a link to the test kit I used, the "Luster Leaf" soil kit.

Below is a picture of the result.

The Potassium, Phosporus and Nitrogen levels. Seems to say surplus of Potassium, depleted Nitrogen, and adequate or low Phosphorus.

ID this small tree

I am trying to identify this small tree (probably 4 feet tall). Photographs taken early September in Massachusetts... Cheers!