Spacelog Apollo 13

Go ahead, Joe.

Okay, Jim. In the LM, there we have—We show battery 3 only drawing about an amp, and we think it's probably time to get it off the line; battery 3 to OFF/RESET. Over.

Okay. We'd like to do that, too. Wait a minute; stand by, Jim.

Aquarius, Houston. How do you read?

I read you loud and clear.

Okay. What we'd like to do, Jim, is—We'll go ahead and get the coarse aline to the gimbal angles that—that you're going to be holding for us; and we'll get the platform up, and then when you call P52 and you use PICAPAR, it probably won't be close enough to put the star in the sextant, but if you can see any kind of a bright star in the general vicinity,—and like general vicinity, I mean 2 to 3 degrees from the center of the telescope, so that you have some clue as to which way to go, then the identification problem shouldn't present much of a—of a difficulty. And once you get the thing in the sextant, then you can go ahead and treat it like any other PICAPAR.

That sounds great, Ken. One little problem: there's all sorts of bright objects floating around us, and also that just staring at part of Aquarius; it's just reflecting light like mad. We can give it a try. There's no problem there; if we can see it, we'll get it.

Okay. And in—in the event that that doesn't work, we're standing by with the original scheme, a set of LM FDAI angles to fly to that'll point the command module optics at the Moon and the Sun; so we can always go back to that.

Okay.

And, Aquarius, Houston. We'd like you to verify the SUIT RELIEF valve to closed. Over.

Stand by. It's closed.

Okay, Houston; Aquarius.

Aquarius, Houston. Go.

We'll go with your original 91-degree angle, if you have the stars figured out, and the coarse aline angle for it.

Okay. Roger that, Jim. Then at—at your convenience here, we'd like you to go to that attitude, as close as you can get, and call up a NOUN 20 for us.

Okay. In work now.

Houston, Aquarius.

Go ahead, Aquarius.

Okay. I take it that, if—if Jack cannot see stars at this attitude after you give him the coarse aline angles, we're just not going to read down to you our gimbal angles and have you figure out a target angle for Jack, but you want him to do sighting on the Moon and the Sun. Is that correct?

That's roughly correct, Jim. Jack will coarse aline at that attitude. This is what we're having you maneuver to the—to that attitude for. We're going to compute coarse aline gimbal angles and pass them up to him, and the first thing he'll do when he gets there, per his checklist, is to coarse aline his platform. Then he'll go into the P52, and, if he can't see stars, we will quickly pass up to you the—your FDAI angles to put him in the Moon-view attitude, and he'll do his P52 on the Moon, and then have you maneuver on the Sun and complete the P52 of the Sun.

Okay. But I'm going to have to maneuver to the Moon to help him out.

Oh. That's—That's affirmative. If he can't see stars at the—at the SEP attitude that—that you'll be holding, you'll have to maneuver to the Moon attitude and then to the Sun attitude for him.

Aquarius, Houston.

Go ahead.

Just like to mention that, even if, for some reason, we run out of time or something and don't complete the Moon-Sun P52, Jack will have a platform coarse aline to the entry REFSMMAT, which we feel will be plenty good enough.

Roger. That's my feelings, too.

Aquarius, Houston.

Hello there, Houston.

Hi! Jim, we—We've gone ahead and computed the CSM coarse aline gimbal angles based on your being at the service module SEP attitude at the time that Jack cranks up the computer and—and coarse alines the IMU. That is, we assume that you're going to be at roll, 0; pitch, 091; yaw, 0; and, if you concur on that, I'd like to pass up the angles for—for Jack to have.

Okay. I'll be there to the best of my ability.