Spacelog Apollo 13

Okay. We have several items, here. First, is a reminder on the PTC that R₁ should be 375—0.375 degrees as last night, to get 0.3-degree rotation rate. The second one —

Okay. Copy that.

Okay. The second one, at 32 hours looking at Bennett's Comet—we want the pictures taken when the spacecraft is as stable as it's going to be before starting PTC. The stability requirement is very high. We weren't sure if you understood that from what we passed up. In addition, the photographs might not show as much as the eye can see of the comet, so if you see anything interesting about the structure of the comet, why, sketching it is in order and is encouraged. Over.

Okay, Vance. What we'll do is, when we get to attitude, we'll disable the quads and do like we did last night; we'll let GUIDO and you people down there tell us when you think we are stable enough; then we'll do all this work with the DAC on the sextant, first; and then when we get that done, we'll go back and put the sextant eyepiece back on and see what we can observe visually.

Okay. That sounds good. Also, while you are waiting for the vehicle to stabilize, it might be interesting to have the eyepiece on and be looking at it visually. Okay. Next item: your SPS burn had no anomalies whatsoever. It was a very good burn.

Okay. Very good.

Next item: request hydrogen tank 1 HEATER OFF for balancing purposes.

And Apollo 13, another item: something that we have observed and you might be seeing is a slight TCE fluctuation on fuel cell 3. This fluctuation has been going from about 152 to 160 over a 37-second period. It has been seen on other flights in the past. No one is worried about it, but the usual fluctuation is about 1-1/2 degrees instead of 7 seconds, so I thought you should be aware of it.

Okay, Vance. And one other slight distinction we've noted is the flow of hydrogen versus the oxygen is not exactly matched on fuel cell 3 either.

Okay. We copy. And the last item: we'd like to send you an IRIG update, so at your convenience, request P00 and ACCEPT.

Okay. We are in P00 and ACCEPT, Vance.

Okay.

Quad C and D are disabled, Vance.

Roger. Disabled. And down here, we see that your hydrogen and oxygen on the fuel cell are exactly matched, so we suspect it's purely a spacecraft read-out problem.

Okay, Vance, let us know when you're through with the DSKY so we can load NOUN 88?

Roger. We'll let you know, Jack.

Okay. You're go for the pictures.

Okay, Vance. We tried our AUTO OPTICS and couldn't pick it up there. We're pointing pretty much right into the Sun, and things are pretty well washed out. And I've gone to MANUAL OPTICS and I'm trying to get 0.8, 12.5 on the shaft and trunnion, and I still can't pick it up. So—it's very light in the sextant, so I kind of think maybe we're too near the Sun to see it.

That's right, Vance. The sextant is all—it's—it's all milky and it—any comet that could be seen through there is just going to be missed in the background.

Okay, we copy that. We got some discussion. Stand by.

Okay, Vance, it isn't—we're not looking into the Sun—what we are getting is a large reflection from the Sun behind us off the LM; and it is—it is coming on that quad 1 there, and that quad is reflecting back into the sextant.

Okay, Jack. Understand. Just a question: if you look through the telescope, can you see the comet at all? Over.

No, I can't, Vance. It's—it's still too light.

Say, Vance?

Roger. Go ahead.

Are the flowers blooming yet?

Gee, I sure haven't seen any.

Okay.

Hey, we've—we've got quite a discussion down here on your trying to observe the comet, and this reflection is not unexpected. And give us another minute, and we'll be back with you on something on that.

Okay. I doubt very seriously though, if we take any photographs with high-speed black and white with the light coming into the sextant that you're going to get anything out of it.

Okay. Unanimous opinion is that you're right, and we'll scratch all of this Bennett Comet stuff on the way out, with the hope that conditions will be more favorable after TEI. Over.

Sounds good. Without the LM, we may have a better chance.

Roger.

And Apollo 13, you're GO for PTC. Your rates are very low according to what we can read.

Okay. Are you going to give a call on OMNI B, Vance?

Do you read, Vance?

Roger. Go ahead. Request OMNI B, Fred, and secure the high-gain antenna.

Okay. You got it.

Apollo 13, Houston.

Go ahead, Houston.

Just something to think about. In about 30 minutes, we can generate the pads that we have yet to send up before the sleep period, so we could support an earlier sleep period if you so desired. And—but, it will take us 30 minutes to get that stuff. The other thing is any time you're ready to copy, I can read up the solo book changes. Over—And, also, two pages in the flight plan.

Okay, Vance. We're about ready to copy the solo book changes and the flight plan changes, and whenever your pads are ready, we'll take those. And as far as moving up the sleep period, that's fine, but we'll—if we don't go to sleep right away, we'll use it to get out some of our lunar maps and study them.

Okay, Vance, I'm ready to copy the solo book changes there.

Okay. First, turn to page 12. On the right-hand side of the page, starting from the middle of the page down, everything under “Cycle 5 frames, Replace dark side or dark slide” should be deleted until you get to the very bottom of the page where you have “Acquisition MSFN OMNI D” and that should remain in. Also, leave in “Remove window shades,” which is about the third line down from where you start.

Okay. Okay. Then from “Cycle 5 frames, Replace dark slide,” from there on down, delete.

That's everything from there on down, with the exception of “Remove window shades” and at the bottom “Acquisition MSFN OMNI D.”

Okay. Copy.

And that includes in the margin to the left, the “DAP load” that's at the very start there and the “0.0507” and “plus 0500,” farther down.

Okay. Got it.

Okay. Going to page 13.

Okay.

Okay, in the left margin, just below 105 hours GET, cross out the “0507” and the “plus 0500,” and below that, add in “DAP load” as follows: “10111 and 11111.”

Okay. Got it.

Okay. Now, next, at about 105:05, there's a “VERB 48.” That should be moved up to 105, and below that, the “VERB 49 maneuver” should be moved up, too.

Okay. That “VERB 48” should be moved up to 105:05 and also the “VERB 49.”

That should be moved up to 105:00. I'm sorry. Both.

Okay.

And what that does is give you more time to maneuver.

Okay. Next.

All right.

Page 14, right-hand side, near the bottom under “Orbital Science,” scratch out “Verify DSE ON,” and also delete “Visual target 3 on track 180 plus 19,” and cross out the penned-in “D5.”

Okay. Got it.

Next, page 15, left-hand column, or left-hand side, rather, near the bottom, where it says “Configure cameras and tape” and goes down through “Replace dark slide.” Just make the comment there, “Solar corona is optional.” Over.

Okay. Got it.

Okay, next page, 16. This is a continuation of the same solar-corona thing. On the right-hand side of the page, starting just above 107:40 with “VERB 49, maneuver to solar-corona attitude,” from there on down to 107:55 just beneath “Replace dark slide,” all of this is in an optional category. So you just might line off —

All right. Got it.

— that and put “Optional, solar corona.” Okay, next, page 17 —

Okay.

— starting at 108:00 on the left-hand side, line out “Stop ORB rate at ORB science attitude.” At—Line out in the left-hand column the DAP load of “10101” and “11111.” Going down to 108:10, add in the following: “Stop ORB rate at track attitude,” and, in parentheses, “0, 353, 0.” In the left-hand —

Okay.

Okay, in the left-hand column under 108:10, put in a DAP load in parentheses of “10101” and, under that, “11111.”

Okay.

Beneath that, scratch out “Spacecraft control dash CMC AUTO verify.” Scratch out the “VERB 79” and all in parentheses after that, like the “Minus 00507,” et cetera. And beneath that, scratch out “PRO to start pitch rate.” In parentheses, “0, 230 slash 018, 0.”

Okay.

Okay. Looking to the right, the LM attitude or rather the CSM attitude will be incorrect, so you can cross that off. And beneath the picture of the moon, cross out the—in parentheses, “108.19” and the “0 230/018, 0”

All right.

On the right-hand half of the page, cross out the “Orbital science block,” and under that “Visual target 1 south of track TR.” And under that, the penned-in “D2/3/4.”

All right. Got it.

And beneath that, cross out “VERB 49, maneuver to track attitude” by the “'C' 0, 353, 0” and the “HU,SCF.”

All right.

Okay. The information beneath that starting with “Configure camera earthshine photos” down through “Replace dark slides” is optional. So just put in “Earthshine optional” as a comment there, and in the camera settings, in the block that has “f:2.8 125, infinity,” cross out the “125” and put in “one-eighth,” 1 slash 8, in other words.

Okay, that last part was, cross out the “125” and put in “1/8.” Is that right?

That's affirm. Okay. Next page. No change. Go to page 19.

Okay.

Okay. On the right-hand side, from the “VERB 49, maneuver to earthshine attitude,” down through everything up to “MSFN uplink,” this is optional. This is “Earthshine optional.”

All right. Got it.

And once again, a camera-setting correction up near the top of that section that we called optional, where you have “bracket MIR f:0.9, 125,” cross out the “125” and put in “1 slash 60.” In other words, one-sixtieth. Over.

Okay. Cross out the “125” and put in “1 slash 60.”

That's correct. And further down at 109:50, where you have “Visual target 17,” et cetera, cross out that line and cross out the penned-in “D17.”

Okay.

Now, move to page 25.

Okay, go ahead, Vance.

Okay. At about 114:10, everything under “Altitude set equals 60 miles” should have the comment “Solar corona, optional,” and on that first line of that optional where it says “VERB 49, maneuver to solar corona and limb brightening attitude,” cross out “And limb brightening attitude.”

Okay.

Going further down to 114:16, cross out the “14 DAC 18 VHBW limb brightening” line and the line under that which is “BRKT, MIR,” et cetera.

All right.

In the block where it says “Solar corona and limb brightening photos,” cross out “And limb brightening photos” and just put “Solar corona, optional.”

Okay. Got it.

Going a few lines below that where you see “DAC ON for 4 seconds at about 50 frame rate cover lens,” cross that out.

Hey, Vance, we lost you there, or did you …?

Yes, I think we lost lock. We'll stand by a minute.

Okay, I got you back.

Okay. Going on down, cross out “114:29:16, DAC ON, SR dash 40 seconds.”

Okay.

And at the very bottom line on that half of the page should be crossed out which is “114:29:56, DAC OFF, SR.”

Okay.

On the right-hand side of page 25, where you have the title “Solar corona and limb brightening photography,” cross out “limb brightening photography.”

Okay.

And in the figure, where you have the “DAC LOS” line, which is parallel to the X-axis on the horizon, cross out “DAC LOS” parallel to X-axis on horizon.

All right.

And cross out the bottom block on that half of the page which is “DAC magazine percent required 12 magazines, g,” et cetera.

All right.

Next page, 26.

Go ahead.

Okay. Cross out the top line on the right-hand side of that page, which is “DAC on for 4 seconds, 50 frame rate cover lens.” And cross out the block to the right of that and down, which has “Magazine percent.”

All right. Got it.

Okay. Next, page 28.

Ready to go?

Go ahead.

Okay. On the left-hand side of page 28, at the very bottom, cross out “Photo target 5 north, frame f:5.6, 215, infinity,” et cetera. All of that line over to the vertical strip. And cross out the penned-in “E4” below that.

Okay, go ahead.

Okay, and the next page, 29, right-hand side near the top, cross out “Photo target 13, north at 5.6, 250,” et cetera, all of that line. And cross out beneath that the penned-in “E5 slash 6.”

All right.