Athena
Payload Accommodations
(TBD - if this data being displayed is for all models, or just this model)
Payload Compartment
Maximum Payload Diameter 2057 mm (81 in.)
Maximum Cylinder Length 2294 mm (90.3 in.) for Model 66 payload adapter
Maximum Cone Length 2002 mm (78.8 in.)
Payload Adapter Interface Diameter Model 24: 591 mm (23.25
in.)
Model 37: 944 mm (37.15 in.)
Model 38: 986 mm (38.81 in.)
Model 47: 1215 mm (47.84 in.)
Model 66: 1676 mm (66.0 in.)
Payload Integration
Nominal Mission Schedule Begins 6–24 months
Launch Window
Last
Countdown Hold Not Requiring Recycling T15 s
On-Pad Storage Capability > 1 year
Last Access to Payload Depends on launch site, typically T6 to 11 h
Environment
Maximum Axial Load Athena I: 8.1 g
Athena II: 8.0 g
Maximum
Lateral Load Athena I: 1.8 g
Athena II: 1.8 g
Minimum Lateral/Longitudinal Payload Frequency Athena I: 15 Hz lateral, 30 Hz longitudinal
Athena II: 12 Hz lateral, 30 Hz longitudinal
Maximum Acoustic Level 133.2 dB
Overall
Sound Pressure Level Without acoustic blankets: 139.2 dB
Maximum Flight Shock Dependent on separation system, worst case is 3000 g from 2 kHz to 10 kHz
Maximum Dynamic Pressure on Fairing Athena I: 140 kPa (3000 lbf/ft2)
Athena II:
38 kPa (800 lbf/ft2)
Maximum Aeroheating Rate at Fairing Separation 1135 W/m2 (0.1BTU/ft2/s)
Maximum Pressure Change in Fairing 7 kPa/s (1.0 psi/s)
Cleanliness Level in Fairing Class 5,000
Payload Delivery
Standard Orbit Injection
Accuracy (3 sigma) ±20 km (11 nmi) altitude, ±0.2 deg inclination
Attitude Accuracy (3 sigma) <1 deg, 2.4 deg/s
Nominal Payload Separation Rate Mission specific
Deployment Rotation Rate Available 0–3 rpm
Loiter
Duration in Orbit Approx. 1 h
Maneuvers (Thermal/Collision Avoidance) Yes, including deorbit
Multiple/Auxiliary Payloads
Multiple Manifest Athena can carry multiple spacecraft on mission-specific dispensers for LEO
constellations.
Comanifested payloads will also be considered under certain
circumstances. Contact Lockheed Martin Space Systems for details on missionspecific
dispensers.
Auxiliary Payloads Auxiliary payloads may be accommodated depending on available
volume and
performance.