Nothing special here, but I like the feel of these:
The four Iron Moon class Orbital Point Defense Bases have been silent sentinels hanging in the night sky of Earth for a year and a half now and make up the majority of static home world missile defense capability, though they're assisted by the offensive missile batteries of the Oberon class Fortress PDC on Earth, several wings of ground-based fighters, aging ISSMB silos, and typically both one light cruiser fleet and one battle cruiser fleet moored in orbit.
70.2% of the Iron Moon's tonnage is dedicated to 24 fast-tracking twin gauss turrets and their fire controls, able to engage 12 salvos of incoming missiles at a time for infinitely sustained planetary defensive fire. Each Iron Moon is thought to be able to shoot down 84 missiles of a theoretical 50,000 km/s speed every 5 seconds. For larger salvos, each Iron Moon carries additional Active Defense Pod racks with a total of 220 Meteor MK II anti-missiles, which can be resupplied by orbital terminals.
The base also carries a point-blank anti-ship battery of 16 Mk III Nova Bombs to destroy enemy capital ships that get into close range after their missile-based attacks have been thwarted. For self-defense, the Iron Moon has double the shield strength of most battle cruisers and strength 9 armor, plus state of the art electronic countermeasures.
The base has a fairly powerful missile sensor and backup corvette sensor, plus a small engine that could allow it to relocate at least between satellites of a planetary system. Being a 30,000 ton ship, it can be maintained by any fleet base able to perform maintenance on battle cruisers.
Iron Moon class Orbital Point Defence Base 30 000 tons 749 Crew 6868 BP TCS 600 TH 120 EM 3840
200 km/s Armour 9-86 Shields 128-300 Sensors 1/1/0/0 Damage Control Rating 8 PPV 454.44
Maint Life 1.39 Years MSP 1145 AFR 900% IFR 12.5% 1YR 646 5YR 9692 Max Repair 192 MSP
Intended Deployment Time: 1 months Spare Berths 1
Magazine 380
120 EP Internal Fusion Drive (1) Power 120 Fuel Use 611.07% Signature 120 Exp 30%
Fuel Capacity 195 000 Litres Range 0.2 billion km (11 days at full power)
Theta R300/384 Shields (32) Total Fuel Cost 512 Litres per hour (12 288 per day)
Twin Gauss Cannon R3-100 Turret (24x8) Range 30 000km TS: 25000 km/s Power 0-0 RM 3 ROF 5 1 1 1 0 0 0 0 0 0 0
Fire Control S02 40-25000 (12) Max Range: 80 000 km TS: 25000 km/s 88 75 62 50 38 25 12 0 0 0
Active Defense Pod (220) Missile Size 1 Hangar Reload 7.5 minutes MF Reload 1.2 hours
Size 10 Box Launcher (16) Missile Size 10 Hangar Reload 75 minutes MF Reload 12.5 hours
Missile Fire Control FC25-R1 (2) Range 25.9m km Resolution 1
Missile Fire Control FC18-R50 (2) Range 18.3m km Resolution 50
Meteor Mk II (220) Speed: 60 000 km/s End: 0.4m Range: 1.3m km WH: 1 Size: 1 TH: 840/504/252
Nova Bomb Mk III (16) Speed: 34 600 km/s End: 1.6m Range: 3.4m km WH: 64 Size: 10 TH: 323/193/96
Active Search Sensor MR6-R50 (1) GPS 240 Range 6.1m km Resolution 50
Active Search Sensor MR34-R1 (1) GPS 192 Range 34.6m km MCR 3.8m km Resolution 1
ECM 40
Missile to hit chances are vs targets moving at 3000 km/s, 5000 km/s and 10,000 km/s
This design is classed as a Military Vessel for maintenance purposes