2009 sats
Sats mined in 2009, blocks 0 to 32,489: shown on the site through the year filter, e.g. Uncommon, Black or 2D palindrome with ?year=2009.
What counts as 2009
A sat's mint year is the UTC year of the block that mined it. On mainnet the blocks of 2009 are heights 0 to 32,489. All of them paid the first-epoch subsidy of 50 BTC, so the sats of 2009 are sats 0 to 162,449,999,999,999 (32,490 × 5,000,000,000 sats). They include the whole vintage range and all 19 Nakamoto blocks.
Uncommon, Rare, Black and 2D palindrome 2009
The site used to list Uncommon 2009, Rare 2009, Black 2009 and 2D palindrome 2009 as collections of their own. They are now the parent collection narrowed to the year: Uncommon in 2009, Rare in 2009, Black in 2009 and 2D palindromes in 2009 show the same supply, holders, sales and listings. Old links to the 2009 collections redirect there.
Their sizes are fixed rule arithmetic. Of the 32,490 first sats of 2009, sat 0 (block 0) is mythic, and the first sats of the 16 blocks at multiples of 2,016 (2,016, 4,032 … 32,256) are rare; tiers are exclusive, so those 17 are not uncommon. That leaves 32,473 uncommon sats from 2009 and 16 rare ones, all mined. Of the 32,490 last sats, the 16 that end a difficulty period (blocks 2,015, 4,031 … 32,255) are black rare, leaving 32,474 black sats from 2009.
The year filter
Any collection can be narrowed by mint year with ?year= (several years separated by commas), by month (?month=2009-12), by a day in any year (birthday sats, ?md=) and by block luck (?luck=8: luck 8 or more). An item passes when one of its sats passes every filter. The same filters work in the API: see filtering & birthday sats.