For PBS TV show "Nova"
Is the correct title capitalization, "Nova: Episode Name" or "NOVA: Episode Name"?

As an example is it "Nova: Hitler's Lost Sub" or "NOVA: Hitler's Lost Sub"

I believe the correct title is "Nova: Hitler's Lost Sub" per the Contribution Rules at http://www.invelos.com/dvdpro/contributions/Rules.aspx?display=titles"  on this page there is a link to the Capitalization Tool (I can't link to the tool in this post)

Enter "Nova: Hitler's Lost Sub" into the Capitalization Tool, and you get the result "Nova: Hitler's Lost Sub".
Enter "NOVA: Hitler's Lost Sub" into the Capitalization Tool, and you get the result "NOVA: Hitler's Lost Sub"

....Start of quote of the "Capitalization Rules"....

Title
Use the title from the front cover.

• Never add distinguishing factors to the title (such as "Widescreen" or "Special Edition"). Use the Edition field for these.
• Check capitalization of the title.
• Do not include quotes if they surround the entire title.
• Include possessives if the front cover includes them, and if they are verifiably part of the title. If quotes surround the title in the credit block (generally on the back cover), check whether the possessive is within the quotes. In the absence of quotes to verify, check the font size used for the title on the front cover. Generally, possessives which use a significantly smaller font are not part of the title.
• Possessive examples: "Tim Burton's Corpse Bride", John Carpenter's "The Thing". In each case, the portion within quotes is the title.
• For titles which include periods, dashes, or other symbols, check the credit block on the back of the case if included. If not, check the film credits or opening sequence. Use these to determine whether to exclude or convert the symbol to a standard character such as ".", "-", or "*"
• Use capitalization rules common to the language of the title. “Tout va bien” is correctly capitalized. “Tout Va Bien” is not.
• English titles will be automatically capitalized by the contribution system per the Associated Press style title standard. Capitalization Tool
• If the title appears in multiple languages, use the title that matches the language of the locality and do not include an alternate title ( for instance in another language).
• Episode descriptors are part of the title; separate them with a colon and space; e.g. "Star Trek III: The Search for Spock". For multiple descriptors, use a colon and space for each break.
• For music and stage performance DVDs, use the performer or group name followed by the DVD title, separated with a colon and space. For example: "U2: Rattle and Hum", "Ellen Degeneres: The Begining".
• Annual DVDs such WWE or NFL Films titles if the year is included it is part of the title and should not be included in the Descriptor field. For Example Title: Year.
• The title for a Box Set should be the title listed on the Front Cover; for example Alien Quadrilogy.
• If the title is shown run together, but with coloring and/or symbols splitting the title words, use standard spacing.
• Certain characters will be converted automatically during contribution. e.g. "•" will be converted to "-"

....End of quote of the "Capitalization Rules"....

So according to the rules, capitalization of titles should be per the "Associated Press style title standard".

As an example, here is a link to an "on-line article" that is "© 2017 The Associated Press. https://phys.org/news/2017-01-pbs-nova-periodic-table-fans-fund.html

Please, read the article in the above link.

Please notice, they discuss / mention two PBS television shows in the article "Nova" and "American Experience". Please observe, they use "Nova" not "NOVA" as the title of the show.


Please read this Wikipedia Article https://en.wikipedia.org/wiki/Nova_(TV_series)
It says "Nova (stylized NOVΛ) is an American popular science television series produced by WGBH Boston."

Here is a link to the "Nova" TV show logo


https://media.azpm.org/master/image/2018/5/3/show-logos/nova-logo.png

This "logo" is seen on the DVD covers, but "NOVΛ" is not the name of the television show.

At the present time December 20, 2018, about 1/2 the titles in the database say "NOVA: Episode Name" but should say ""Nova: Episode Name"