"Maybe the five relay replacements can be located or cannibalized out of the rest of the ship. I'm not sure. Maybe a makeshift thrust-control can be set up. It would take days anyway and I couldn't guarantee results."
"Days!" cried the commander. "It can't take days. We're fatting toward Jupiter!"
There was a complete silence for a few moments, and then Panner put into words what all of them knew. "That's right, Commander. We're failing toward Jupiter and we can't stop ourselves in time. It means we're through, Commander. We're all dead men!"
14. Jupiter Close Up
It was Lucky who broke the deadly silence that followed, in sharp, incisive tones. "No man is dead while he has a mind capable of thought. Who can handle this ship's computer most rapidly?"
Commander Donahue said, "Major Brant. He's the regular trajectory man."
"Is he up in the control room?"
"Yes."
"Let's get to him. I want the detailed Planetary Ephemerae … Panner, you stay here with the men and get to work cannibalizing and improvising."
"What good will it-?" Panner began.
Lucky cut in at once. "Perhaps no good at all. If so, we'll hit Jupiter and you'll die after having wasted a few hours of labor. Now I've given you an order. Get to work!"
"But…" Commander Donahue seemed stuck after that one word.
Lucky said, "As councilman of science, I'm assuming command of this vessel. If you wish to dispute that, I'll have Bigman lock you in your cabin and you can argue it out at the court-martial proceedings, assuming we survive."
Lucky turned away and moved quickly up the central shaft. Bigman motioned Commander Donahue up with a quick jerk of his thumb and followed last.
Panner looked after them scowling, turned savagely to the engineers, and said, "All right, you bunch of corpses. No use waiting for it with our fingers in our mouths. Hop to it."
Lucky strode into the control room.
The officer at the controls said, "What's wrong down there?" His lips were white.
"You're Major Brant," said Lucky, "We haven't been formally introduced, but never mind that. I'm Councilman David Starr, and you're taking orders from me. Get at that computer and do what you're told with all the speed you have."
Lucky had the Planetary Ephemerae before him. Like all great reference works, it was in book form rather than film. The turning of pages, after all, made for the more rapid location of a specific piece of information, than did the long-drawn-out unwinding of film from end to end.
He turned the pages now with practiced hand, searching among the rows and columns of numbers that located the position of every chunk of matter in the solar system over ten miles in diameter (and some under) at certain standard tunes, together with their planes of revolution and velocity of motion.
Lucky said, "Take the following co-ordinates as I call them out, together with the line of motion, and calculate the characteristics of the orbit and the position of the point at this moment and for succeeding moments for the space of forty-eight hours."
The major's fingers flew as figures were converted by the special punch machine into a coded tape which was fed into the computer.
Even while that was taking place, Lucky said, "Calculate from our present position and velocity our orbit with respect to Jupiter and the point of intersection with the object whose orbit you have just calculated."
Again the major worked.
The computer spat out its results in coded tape that wound on to a spool and dictated the tapping of a typewriter that spelled out the results in figures.
Lucky said, "At the point of intersection, what is time discrepancy between our ship and the object?"
Again the major worked. He said, "We miss it by four hours, twenty-one minutes, and forty-four seconds."
"Calculate how the velocity of the ship must be altered in order to hit the point squarely. Use one hour from now as the starting time."
Commander Donahue broke in. "We can't do anything this close to Jupiter, Councilman. The emergency power won't break us away. Don't you understand that?"
"I'm not asking the major to break us away, Commander. I'm asking him to accelerate the ship toward Jupiter, for whatever our reserve power is worth."
The commander rocked back on his heels. "Toward Jupiter?"
The computer was making the calculation and the results were coming in. Lucky said, "Can you accelerate by that much on the power available?"
Major Brant said shakily, "I think so."
"Then do it."
Commander Donahue said again, "Toward Jupiter?"
"Yes. Exactly. Io isn't the innermost of Jupiter's satellites. Amalthea is closer, Jupiter Five. If we can intersect its orbit properly, we can land on it. If we miss it, well, then, we will have hurried death by two hours."
Bigman felt a surge of sudden hope. He could never entirely despair while Lucky was in action, but until that moment he had not seen what it was that Lucky intended doing. He remembered now his earlier conversation with Lucky on the subject. The satellites were numbered in order of discovery. Amalthea was a small satellite, just a hundred miles in diameter, and it was discovered only after the four major satellites were known. So, though the closest to Jupiter, it was Jupiter Five. Somehow one tended to forget that. Because Io was called Jupiter One, there was always the tendency to think there was nothing between it and the planet itself.
And one hour later the Jovian Moon began a carefully plotted acceleration toward Jupiter, hastening toward the death trap.
They no longer centered the visiplate on any part of Jupiter. Though the latter swelled hourly, the center of sight remained on a portion of the star field a considerable distance from Jupiter's rim. The star field was under maximum magnification. At that point should be Jupiter Five, streaking for its rendezvous with a ship which was hurtling and straining down, down toward Jupiter. Either the ship would be caught by the speck of rock and saved, or it would miss and be lost forever.
"There it is," said Bigman in excitement. "That star shows a visible disk."
"Calculate observed position and motion," ordered Lucky, "and check with the computed orbit."
This was done.
"Any correction?" Lucky asked.
''We'll have to slow down by-"
''Never mind the figures. Do it!"
Jupiter Five circled Jupiter in twelve hours, moving in its orbit at a speed of nearly three thousand miles an hour. This was one and a half times as rapid as Io's motion and its gravitational field was only one twentieth that of Io. For both reasons, it made the harder target.
Major Brant's fists trembled on the controls as the all-important side thrusts bent the Jovian Moon's orbit ever so slightly to meet the onrushing Jupiter Five, slip behind it and round, matching speeds for just those vital moments that would enable the satellite's gravity to establish the ship in an orbit about itself.
Jupiter Five was a large, brilliant object now. If it stayed so, good. If it began to grow smaller, they had missed.
Major Brant whispered, "We've made it," and bis head fell forward into his shaking palms as he released the controls.
Even Lucky closed his eyes momentarily in a land of weary relief.
In one way the situation on Jupiter Five was far different from what it had been on Io. There, all the crew had been sight-seers; the consideration of the heavens had taken precedence over the leisurely preparations in the valley.
Here on Jupiter Five, however, no one emerged from the Jovian Moon. What there was to see, no one saw.
The men stayed aboard the ship and worked on the repair of the engines. Nothing else mattered. If they failed, the landing on Jupiter Five could only postpone doom and stretch it out into greater agony.