Orbital GEOStar-3 Bus - Manual (Page 2)

Orbital Sciences Corporation
45101 Warp Drive • Dulles, Virginia 20166 • www.orbital.com
©2014 Orbital Sciences Corporation FS002_13_2998
GEOStar
™
-3 Bus
Low Cost Launch Opportunities
The GEOStar-3 Bus is designed to maintain compatibility with all commercially
available launch vehicles. The ability to launch on multiple vehicles gives customers
greater flexibility and lower launch cost access to space. The propellant tanks
on GEOStar-3 support a larger delta-V to orbit than typical GEO satellites, which
allows GEOStar-3 to make optimal use of launch vehicle performance capability.
In addition, GEOStar-3 adds the opportunity to dual-manifest two spacecraft
on select launch vehicles, with each spacecraft configured to fulfill its mission
independently after launch. This creates an opportunity for dramatic launch
cost savings. Whether designed for a single-launch or dual-launch campaign,
GEOStar-3 offers a significant increase in payload mass capability.
Mission Services
Customers can purchase a GEOStar-3 spacecraft bus alone, or as part of a turn-
key service that includes an integrated satellite, operations and launch vehicle.
Orbital conducts spacecraft commissioning from its own ground station prior to
transferring spacecraft control to the customer’s operations center.
Mission Life
As with the GEOStar-2, the GEOStar-3 satellite is designed with conservative
margin beyond 15 years, taking into account damaging effects of the
geosynchronous environment. The typical limitation of mission duration is on-board
fuel for orbit maintenance station-keeping. Fuel life can be optimized and extended
to well over 15 years, based on launch vehicle selection. Orbital has several
delivered satellites with predicted fuel life in excess of 20 years. GEOStar-3 has
propellant accommodation that can be used to significantly extend maneuver life.
Heritage and Versatility
GEOStar-3 was designed around the concept of scalability and customer options,
while still maintaining the use of standardized, qualified components and subsystems.
The C&DH system of the GEOStar family has been upgraded to provide more
capability to support advanced mission requirements. The EPS system of the
GEOStar family, while retaining the heritage 36V regulated bus architecture, offers
expandable capability to support GEOStar-3 class payload power requirements. The
dual-manifest launch capability introduced with GEOStar-3 uses the same highly
reliable, short duration bi-propellant orbit raise propulsion system that has enjoyed
success on over 30 GEOStar-2 spacecraft. GEOStar-3 has options for battery and
solar array size, payload module height and station-keeping thruster selection that
allow Orbital to provide customers with the best balance of satellite and launch
cost, mission lifetime and payload performance. With its expanded payload carrying
capability, enhanced C&DH functionality and larger EPS system, GEOStar-3 also
offers customers the largest hosted payload envelope in the GEOStar family.
Value
GEOStar-3 further enhances Orbital’s value proposition to its customers,
combining fast delivery, low cost and high reliability with a larger payload envelope
and low cost launch alternatives.
Specifications
Core Bus Features
Payload Mass Capability: Up to 800 kg (single)
Orbit: Geosynchronous
Typical Mission Lifetime: >15 years
Delivery:
24 months after receipt of
order (payload dependent)
Single Launch
Compatibility:
Ariane 5, Falcon 9, H-IIA,
Proton, Sea Launch, Land
Launch
Dual Launch
Compatibility:
Ariane 5, Proton, Falcon
Heavy
Structure
Bus Dimensions (HxWxL): 3.0 to 3.9 m* x 2.1 m x 2.3 m
Construction:
Composite/Al
Power Subsystem
Payload Power:
8,000 W
Bus Voltage: 36 VDC (nominal)
Solar Arrays: Multi-junction GaAs cells
Batteries: Li-Ion
Attitude Control Subsystem
Stability Mode:
3-axis; zero momentum
Propulsion Subsystem
Transfer Orbit System:
Liquid bi-propellant
On Orbit: Electric + Monopropellant
Command & Data Handling Subsystem
Flight Processor:
BAE RAD750
Interface Architecture: MIL-STD 1553B, CCSDS
*Extensible payload module height
More Information
Mr. Amer Khouri
Vice President of Marketing, Global Communications
(703) 948-8600, [email protected]