... Fun fact: Sigma Draconis is very close to us, less than 6 parsecs away.
..
But is that a fun fact or a story problem?
In my opinion the writer of space opera story of interstellar exploration should decide how far from the home planet the zone of exploration is and how deep that zone is. For example, maybe all the worlds they visit are between 90 and 110 light years from Earth, or maybe between 900 and 1,100 light years, or whatever. And they should all be in pretty much the same direction from the home world instead of in many different directions.
And of course, in most science fiction written by Earth humans the home world of the protagonist space explorers is Earth, in the Sol System.
I have always been annoyed by the way old time space opera science writers casually mentioned stars with well known names.
For example, in Edmund "World Wrecker" Hamiliton's stories about the Interstellar Patrol (from 1928-1930) the Interstellar Patrol works for the government of the entire Milky Way Galaxy, but all the member species come from stars with well known names on Earth. Even though, even way back then, it was known that the Milky Way Galaxy has not just millions of stars, but "billions and billions", as Carl sagan would say, of stars. So statistically the odds against all the intelligent life coming from the few stars whose names were well known to the readers would be - astronomical. Especially since a few decades later research showed that most of the famous stars are extremely unlikely to have habitable planets..
Furthermore, all off the famous stars in our galaxy are within a few thousand light years from Earth, and thus within about one percent of the volume of the galactic disc. Suppose that science ficiton story is set in an era when exploration has reached only a few thousnd light years from Earth and aobut one percent of the galactic disc, a regiion were all the stars with famous names are. There will be millions or billions of stars within that region, and so the tens or hundreds of famous stars will be only a tiny minority of the stars within that volume of space.
A sceience fiction writer should decide what percentage of stars in their story will have habitable planets which humans can colonize, and which percentage of stars have planets with lifeforms, and which percentage of stars will have planets with contempoary alien intelligent beings, and what percentage of stars will have planets with native civilizations capable of intersttellar stravel. So by deciding how far the frontier of exploration is from Earth, and knowing how many stars should be within that volume of space, it is simple to be divide that number by the various percentages and find out how many stars within that volume of space will have a habitable planet, or an advanced interstellar civilization, etc.
Then the writer can know how many of each there should be in the explored region in their story.
And conversely, if the writer knows how many of each they want in their story, and what percentage of stars should have them in their story, they can then calculate how far has been explored. If the writer wants the protagonists to constantly discover the first known example ever of a specific type of planet, or a specifice type of lifeform, or a specific type of alien culture, then they can calculate how close to Earth the explorers should be exploring, to discover the first examples of those. And if the writer wants many examples of each type of planet to be already discovered, and many star travelling calien species with interstellar empires, etc., they can calculate how far from Earth the explored universe should extend.
For example, in "The Empath":
KIRK: Without speech, how's she going to be able to understand us? Unless she's a telepath.
SPOCK: An unlikely possibility, Captain, since over ninety eight percent of the known telepathic species send thoughts as well as receive them. She's made no attempt to contact our minds.
http://www.chakoteya.net/StarTrek/63.htm
If there were exactly 100 known telepathic species, and 98 could send, that will be exactly 98 percent, and if 99 could send, that would be exactly 99 percent. Thus it seems that Spock would have said exactly what percent of telephatic species could send if there wre only 100 telepathic species known.
And there can be a lot of arguement about how many telepathic species should be known for Spock to simply say "over 98 percent" instead of giving a precise percentage. But if there was agreement about exactly how many telepathic species were known at that time, and if it was known what percentage of intelligent species were telepathic, one coould clculate the number of intelligent species known in that era. And if the percentage of stars with intelligent species in
Star Trek was known, one could then calculate how far the frontier of exploration is in that era of TOS.
For example, if six known stars within 50 light years of Earth are mentioned as having intelligent natives in variious productions, one can calculate there are at least seven stars with intelligent life (counting the Sun) within a radius of 50 light years and thus a volume of 593,598.776 cubic light years. Assuming that is a good sample, one could then multiply that volume by the number of known intelligent species divided by 7. Assuming that number was 7,000 inteligent species, explored space would then be a volume 1,000 times as large, which would thus have a radius of 500 light years. But if there are actually more intelligent species within 50 light years of Earth than happen to be mentioned in various productions, the volume of explored space could be proportionally smaller.
And of course very few people connected with
Star Trek seem to have ever thought about such matters. And thus it is seen that in TOS travel to Rigel and Deneb is relatively fast and easy, while on the other hand the Enterprise, usually at the edge of the explored zone, is close enough to Sigma Draconis for a native of Sigma Draconis VI to steal Spock's Brain.