Good evening. Forums for discussing 2300, and people to discuss it with, are becoming scarce. This is going to be something of a test post, making sure that I can post images and links, as well as opening the discussion.
2300 is an interesting setting, one of the few that makes an attempt to ground itself in real world astronomy. As we all know, and as EDG has dealt with in detail, there are still some issues with it and those issues relating 2300 to the real world have become noticeable given the dramatic increase in exoplanet and exosystem knowledge developed in the past 10 years. I am not sure of the utility in trying to reconcile the real world with 2300 - some of which would require throwing away much of the 2300 setting - but I don't want to get into that in my first topic.
Another problem that can be more immediately dealt with is specific to the η Boötis system. There are several versions of Aurore out there: in one version Aurore is a more distant moon of a brown dwarf orbiting Tithonus, and in another (influenced, I believe, by EDG) Aurore is very close to Tithonus, orbiting every 8.9 hours (canonically) or 9.14 hours (32904.1 seconds) by math. At least, by my math. I make lots of mistakes -System of moons around Tithonus
The Tithonus system of moons is not well defined other than Aurore. We know there are three other major moons, but we know little more about them than their names, Memnon, Selene and Antilochus, the first two being closer orbiting than even Aurore and airless balls of rock. Antilochus is only described as being ice covered and appears as a small, brilliant disc in Aurore's sky.
This is one proposed configuration. The four major moons are in 1:2:4:8 Laplacian MMR.
and an edge view:
As that is drawn, at that moment both Antilochus and Memnon are visible from Tanstaafl (if its position of 12ºS 88ºW is accurate - which it may not be, another topic). Antilochus with an apparent magnitude of -10.6 (and a 20 arc minute disc) and Memnon at -7.6 just shy of 13 arc minutes).
Though I tried to set the system up as a stable resonant system, it does not remain stable, which will start to introduce slight (but important) eccentricities in the orbits which in turn have implications for Aurore's suitability for colonization. Satellites of Aurore, Communications
I believe that the only stable locations to place satellites for communication use around Aurore are at the Tithonus-Aurore L4 and L5 points. L1 and L2 are not stable in this system:
with this test satellite placed at L1 entering independent orbit around Tithonus after only 1/2 an orbital period. Even very slight eccentricities in Aurore's orbit seem to exacerbate the problem. Very low orbiting satellites are also, somewhat surprisingly, not stable in even the short term. Mid-altitude retrograde satellites will remain in orbit for a fair amount of time but have unusual and unpredictable shaped orbits and would probably not be useful as communications satellite orbits. L4 and L5 are long term stable, however, surviving a test run of 100 years of simulation without departing more than about 20 km (in a psuedo-orbit) from the nominal L4 and L5 points. The takeaway from that is that the canonical solar power satellites would likely have to have been placed at L4 and L5 - 1.9 light-seconds away from Aurore.
It is mentioned that radio communications is difficult on Aurore, with only line of sight microwave in use. optical and near optical laser communications with spacecraft are already becoming a thing in the real world in 2019 (622 mbps downlink, 20 mbps uplink from cislunar space having been done in reality) and communications between ground station hubs and L4 and L5 could be done the same way. Communications between Nova Kiev and Tanstaafl have to take the more difficult route of going from one of the cities, to one of the Lagrange points, to the other one, and then back down. That is, Nova Kiev->L5->L4->Tanstaafl, about 8 light seconds light speed delay.
Of note, both L5 and L4 are visible from the hot pole and neither are visible from the cold pole, nor within 30º of the pole.
that's probably enough for a test post, but in general the questions that I think should be resolved for the setting are:
1) Is Aurore plausible at all?
2) Where exactly, in latitude and longitude, are the cities of Aurore? Two of them have specific coordinates stated, but the published maps do not line up with those coordinates. In the case of Nova Kiev, it isn't even close.
3) Given the relocation of Aurore inward to its ~9 hour orbit, does it make sense to declare Aurore the only major satellite of Tithonus? If not, perhaps making the other satellites distant orbiting satellites, in order to minimize their influence in numerical simulation and thus make in-game stability more plausible.
4) How are communications conducted at distance on Aurore, particularly between the two hemisphere?
and with every single system in Traveller 2300, with the exception of the solar system itself, what is the orbit normal and axis of rotation of Aurore? I gave it an arbitrary 8º inclination vs the system inclination (that is, the orbit normal of Tithonus and Aurore have 8º difference between them) but it isn't stated anywhere.