Small Mars Mission Architecture Study

Table 4

Preliminary mass budget information for the Mars Communication Constellation mission.

		Mass (kg)
Attitude, orbit, guidance, navigation control		8.0
Chemical propulsion		6.9
Communication (UHF proximity link, DTE link: X-band, 50 W TWTA, 1 m HGA)		30.1
Electric propulsion (T6 engine)		70.4
Instruments		7.0
Power (2.8 kW @Mars for electric propulsion)		158.9
Structures		56.6
Thermal control		13.3
Data handling (0.5 Gb/day science data)		5.3
Harness		17.8
Dry mass		374.3
System margin	20%	74.9
Dry mass incl. system margin		449.2
CPROP propellant mass		4.7
CPROP propellant margin	2%	0.1
EPROP fuel mass (10.4 km/s ΔV)		153.8
EPROP fuel margin	2%	3.1
Wet mass (per satellite)		610.9
Constellation total dry mass incl. system margin		1347.6
Constellation total wet mass		1832.7
Launch adapter		360
Launch mass (wet mass + adapter)		2192.7

The bold values refer to summation values of the figures above them.