I suggest looking at a more up-to-date list of observatory codes. Such as the one on the site of the people who maintain it:
[link to www.minorplanetcenter.net]
And this is not the list of all observatories in the world, only the ones that report observations to the Minor Planet Center.

Leonid Elenin's observatory is listed as "ISON-NM", code H15. It's written on the header image of his blog.

The "observatory" is a remotely controlled telescope in a shed on the grounds of the New Mexico Skies astronomy hosting company:
[link to www.nmskies.com]

Here's an ISON/PulKON page about it, in Russian:
[link to lfvn.astronomer.ru]