First, some IP notes. The Beta Aquilae Cluster was in a DGP product, and thus their IP. GDW planned to use some of the ideas about exploring beyond the American Arm as one of their three focal storylines (see below). The Aquilans are the IP of Quicklink Interactive's successor.
The three threads for 2300AD were to be:
1. The Kafer War
2. The Provolution terrorist threat (encompassing all the cyber stuff)
3. Exploring beyond the boundaries of the American Arm
In the 1988 boxed set (and Challenge 33) they stated the state of play was:
1. A hunt for brown dwarves had recently started, few had been found and they had limited utility (i.e. ISO 417 hadn't been found, and neither had the "backdoor").
2. Trilon Corporations had recently acquired the plans for a stutterwarp tug, and planned to use it once built to send ships out. The limitations on the stutterwarp in the TD article never existed, and tugs have always been possible. It just needs a task roll.*
Per the semi-canon article AECA, the AECA (the 2300AD equivalent of NASA, the American civilian space agency) was sending expeditions to a garden world named Highland at DM+52 2294. The stars are just too far for a discharge (see map), and assumidly this is where the tug was for. They likely were using the dangerous "delay discharge" rule to go further than 7.7 ly.* The rules have always allowed the 7.7 ly limit to be exceeded, but it is moderately dangerous. There are ways of mitigating the risk involving having a second drive and ejecting the first is it threatens to breach. It's probably how all exploration craft reach new systems.
In reality, the reason was a simple misdrawn map.
* There are three engineering methods of going beyond 7.7 ly:
1. Tune the drive to increase range by 1 day's travel; difficult task, ship drive engineering skill, time taken = 3d6 h - engineers SDE skill (min 3 h)
2. Use a burner drive, the task to bring the new one online; difficult task, SDE, hazardous, time taken = 3d6 - engineers SDE * 30 min (min 1.5 h)
3. Use a tug. Two task rolls are needed, one to offline the drive and one to online it. The first is formidable, SDE, hazardous, 3d6 - SDE h (min 3 h). The second is exactly the same as bringing a drive up in (2).
AC+20 1463-148 would also be the launch point to the Beta Aquilae Cluster, via a brown dwarf. However, the brown dwarf is completely unnecessary. The BAC is accessible by tug:
AC+8 142-393 is 10.34 ly from AC+20 1463-148
AC+2 2155-242 is 11.12 ly ditto
Thus, if you can get to AC+20 1463-148, getting to Highland or the BAC is doable. However, the elephant in the sky is Vega. This is a very young, superhot star that won't have planets. In the 1988
stutterwarp rules revision, like Arcturus, it is a navigational nightmare. The Vega outpost is a station, like Station Arcture. Using post 1988 rules (including Mongoose editions), travel to and from Vega is near impossible, and requires burning a drive, because there is nowhere to discharge in the system.