WORTH NOTING ON TV

* TUESDAY

TV Nation (NBC, 8-9 p.m.): Fans of the 1989 counterculture film ``Roger and Me'' will be pleased and maybe a little surprised to learn that its irreverent creator, Michael Moore, now has a network show.

``Roger and Me'' was a highly personalized documentary that recorded, among other things, Moore's eccentric efforts to get the chairman of General Motors to comment on the company's decision to shut down much of its business in Flint, Mich.

The TV series, a sardonic takeoff on the news-magazine format, brings the same persistence, humor, and populist skepticism to a range of business and other practices in the United States and elsewhere. Moore explores how they work and how they affect individuals with no special influence or standing.

Segments include examinations of such things as real-estate sales near Love Canal, N.Y., what it's like for an African-American to catch a cab in New York City, and many other byways of private and commercial life.

The Great Comet Crash (PBS, 10:30-11:30 p.m., EDT): Live coverage of a comet's impact on the planet Jupiter. Mountain-sized chunks of Comet Shoemaker-Levy 9 are sending up towering fireballs visible to astronomers over the planet's horizon, and leaving Earth-sized scars in the planet's clouds.

Scientists weren't at all sure how visible the effects would be, but the comet has been putting on a good show, even though the impacts are occurring on the side away from the Earth. (The impacts began Saturday, and continue until Friday.)

This program airs on the day that one of the biggest fragments, Fragment K (about two miles in diameter), is due to strike. Viewers will also see animation, film clips, and other material, and will hear comments from a cross section of scientists and other experts.

Please check local listings for these programs.