This must be because the federal government is the petitioner, but this is merely a conditional petition. The government opposes Peabody’s and Navajo’s petitions, and those aren’t “petitions to watch.”

Here:

Title: Equal Employment Opportunity Commission v. Peabody Western Coal Company
Docket: 10-1080
Issue(s): Whether the Secretary of the Interior is a “required party,” within the meaning of Rule 19(a)(1) of the Federal Rules of Civil Procedure, to an action by the Equal Employment Opportunity Commission against a private employer, where the challenged conduct was undertaken pursuant to a federally approved mining lease between the employer and an Indian Tribe, but no federal agency is a party to the lease.

Certiorari stage documents:

• Opinion below (9th Cir.)
• Petition for certiorari
• Brief of Peabody Western Coal Company in opposition
• Brief of Navajo Nation in opposition