A pair of Rocket Lab-made spacecraft are about to embark on a two-step journey. Step one is the 55-hour, 2,500-mile stretch from California to the launch website at Cape Canaveral. The second step? Simply 11 months and 230 million miles to Mars.
The target of the Escape and Plasma Acceleration and Dynamics Explorers (ESCAPADE) mission is to review the interplay between photo voltaic winds and the Martian ambiance. The College of California, Berkeley’s Area Sciences Laboratory (SSL) developed the scientific payloads for the mission, however the satellite tv for pc bus — the precise platform that can journey via area and host these payloads in an orbit round Mars — is all Rocket Lab. The mission is presently set to launch no sooner than October on the primary launch of Blue Origin’s New Glenn rocket, in line with NASA.
Whereas the corporate is finest recognized for its Electron rocket, which is second solely to SpaceX’s Falcon 9 by way of launch numbers, the vast majority of its income really comes from constructing and promoting spacecraft and spacecraft parts. With ESCAPADE, Rocket Lab is seeking to present each the area company and the world that it may possibly produce extraordinarily high-performance spacecraft which can be able to journeying all through the photo voltaic system.
The corporate proved itself as soon as when it constructed the satellite tv for pc bus for NASA’s Cislunar Autonomous Positioning System Know-how Operations and Navigation Experiment (CAPSTONE) mission to the moon in 2022. That spacecraft took a virtually five-month sojourn into deep area earlier than getting into lunar orbit. However attending to Mars takes considerably longer — and traditionally, it’s additionally been very, very costly. Two latest missions that despatched orbiters across the Purple Planet, the Mars Reconnaissance Orbiter in 2005 and MAVEN in 2013, every price NASA over a half billion {dollars}.
So in 2019, the area company established the Small Revolutionary Missions for Planetary Exploration (SIMPLEx) program to fund small spacecraft missions into deep area. Like different NASA packages established in recent times, it’s additionally an effort on the a part of the company to embrace threat. As an alternative of spending $550 million on a mission into deep area, NASA set a aim to spend simply one-tenth of that and gave every SIMPLEx mission a $55 million value cap, excluding launch. ESCAPADE is one among three missions the company chosen underneath the SIMPLEx program, and in all chance, the primary that can really launch.
These funds went to the principal investigator for the mission, SSL, who contracted Rocket Lab for the 2 satellite tv for pc buses. Rocket Lab isn’t saying how a lot of that $55 million went to them, however the lead programs engineer for ESCAPADE, Christophe Mandy, mentioned the corporate was “two orders of magnitude cheaper than anything else.”
The spacecraft, named Blue and Gold, are based mostly on Rocket Lab’s Explorer platform (which gained flight heritage throughout CAPSTONE), recognized for its excessive delta-v capabilities to help missions of this sort. One of many largest challenges for the Rocket Lab engineers was designing a spacecraft that may get from Earth orbit all the best way to Mars; for that purpose, the ESCAPADE spacecraft are about 70% gas by mass. That gas will make the spacecraft able to about 3 kilometers per second of delta-v, or change in velocity, which could be very excessive for a satellite tv for pc of this dimension.
The opposite large problem is that Rocket Lab didn’t know the launch supplier till comparatively late into the design course of, when NASA chosen New Glenn in February 2023. This unknown affected what are known as the “driving constraints” for the spacecraft, or the elements that form the engineer’s design choices.
“Almost every single spacecraft I’ve ever seen has had launch vehicle as a driving constraint, but because we didn’t know what the launch vehicle was going to be, we did that differently,” Mandy mentioned. “So we made an enormous amount of effort to make it so that the launch vehicle was not [a] driving constraint, which is just very unusual.”
As an alternative, Rocket Lab engineers ended up basing a lot of the spacecraft design on one other variable: the utmost quantity of mass the spacecraft can take via a essential maneuver known as the Mars orbital insertion (MOI), which is the maneuver the spacecraft will carry out in deep area to enter Martian orbit.
“So the amount of mass we have on the system is driven by physics, rather than by something man-made, like the launch vehicle,” Mandy mentioned. However as soon as the launch car was chosen, “we didn’t have to do the redesign, because our design was driven by other requirements.”
These constraints helped push engineers to innovate. As an alternative of a field, the 2 spacecraft are mainly “tank sandwiches,” as Mandy known as them, with two decks related by struts, with the gas tanks within the center. Usually, the first construction of a satellite tv for pc accounts for round 20-22% of its whole mass; on ESCAPADE, due to the sandwich design, that quantity is simply 12%.
These modifications have escalating results, Mandy mentioned: Much less mass within the major construction means much less gas for that, which implies a distinct tank dimension, and so forth. Engineers additionally designed the spacecraft so that every one the parts that are inclined to get scorching, just like the flight laptop and the radio, are close to the one deck of the spacecraft, whereas all of the parts that tend to get chilly, just like the propulsion system, are close to the opposite. These modifications imply that the spacecraft will want much less energy, smaller photo voltaic panels, fewer heaters, and lots of different results.
After launch, the spacecraft will spend 11 months touring to Mars earlier than performing that essential MOI burn. However the solar shall be between Earth and Mars when the spacecraft are anticipated to carry out the burn, making well timed communication with them unimaginable. Rocket Lab engineers must wait one other three months or so earlier than sending a command to the spacecraft to begin circularizing its orbit. Then the spacecraft will accumulate and transmit scientific information again to Earth for round 11 months.
Mandy declined to say the precise launch window for the mission, saying that it’s as much as Blue Origin to find out, however he did say that now’s the height of effectivity for the spacecraft’s journey, and that window extends “through several months after the peak.” If Blue Origin misses the window, the 2 corporations and NASA must wait one other 26 months till the ESCAPADE spacecraft can begin unlocking the secrets and techniques of Mars.
