That's the thing. There is no asimuth or elevation because it is just pure imagination.
The "observations" show it anywhere in the sky. Sometimes they show it the same visual size as the sun and Moon. Sometimes they show it the size of a normal planet. Sometimes it is next to the sun, almost touching it visually. It can be in any position relative to the sun. Sometimes they claim to see Nibiru in the East when the sun is setting in the West. Sometimes they say it's an entire solar system with a star and several planets. Sometimes it is visible, and other times it is not and they claim it is "hiding behind a dust cloud". Even when someone else at the same time spots it from another part of the Earth. There is absolutely no consistency to it.
The reason surely is that these are all photographs of lens flares, offset lens reflections, bright lights on clouds, etc etc. Any bright light seen in the sky and any bright spot in an image is claimed as Nibiru as are various hoaxes.
For more see "Imaginary Bullshit Planet" Nibiru - Lens Flares, Sun Mirages, Hoaxes & Just Plain Silly
See also my online petition at Change .org: Let's End Dramatized Reporting of "Doomsday" Stories - The Vulnerable Get Suicidal