It is almost impossible to determine the size and altitude of this object.  We know that it is being photographed through a 1000mm lens.  We know the satellite is orbiting the earth at an altitude of  179 miles.  Assuming this, the object would be 350 feet in diameter if resting on the ground.  The sun angle is commensurate with the lighting on the neighboring mountain ranges. If its altitude were higher than the Groom mountain range, it wouldn't be reflecting this and the test site in its lower quadrant as it is. To further mess things up in regard to optical analysis, the lensing effect of the gravity distortion around the craft could very easily present an image of an object many times its actual size.