Spacelog Apollo 8

COMM sure is good all of a sudden, isn't it?

Houston, Apollo 8.

Go ahead, Apollo 8.

Okay, we have completed two sets on 26 and one set on 16.

Roger. Getting pretty speedy there.

Jim is getting to know the objects.

Are you receiving the data, Houston?

Affirmative.

Okay.

Keeping you honest.

Right.

Okay, Apollo 8. We have looked at the data and it looks good and they feel like you can go back to PTC attitude anytime you are ready to. And if you can—go ahead.

What attitude do you want to use? The same one?

That's affirmative.

Thank you.

Okay, if you can reach over Bill there and get to panel 3, I believe we would like to cycle the oxygen fans. And also like to get the BIOMED switch over to CMP.

Okay.

If you have to bother Bill to do that, why, we can hold off on the cryo fans.

No, he moved. We already chased him under the seat. Okay, now you want just the oxygen fans on?

That's affirm. Turn one on for about 2 minutes and when we turn it off, then we will turn the next one on. We don't want to turn them on simultaneously though.

I know that. I mean you don't want hydrogen though?

That's affirmative. Just the oxygen.

Houston, Apollo 8.

Go ahead.

Ken, just recap a little explanation here on your maneuver PAD, something which I'm really not knowledgeable about, the way it was presented to us, you mentioned fast return P37 DELTA-V of 8750, just briefly clarify that, will you please?

Ken, can you give us a little report on how our trajectory looks and the tracking is going and things like that?

Okay, sure will. I will put a summary together here.

And the pericynthian sign.

Roger, we will get all that together for you in just a few minutes.

And we never did get the news.

You are the news.

Come off it, come off it.

Okay, the fans have been cycled 2 minutes each and they are back off.

Houston, Apollo 8 is back in the PTC attitude, reads MHPTC.

Okay, thank you. And in reference to your question about the P37 DELTA-V, 8750, that's the number that goes into the option at P37 for your minimum time return. That gives you a target for the Indian Ocean. And in this case, we are going to have to use the high-speed procedures that were worked out for you to use some minus number for the major axis.

Roger. Understand. I'm going to give that a try, Ken, in a run through. I tried it yesterday, I wasn't getting too much in the way of results. I will give it a try today.

Okay. And on the—your tracking that we have now, it still looks like the time we gave you last night for time of pericynthian is still good, 69 plus 10 and right now your flyby earth pericynthian altitude is 65.8. Looks like the midcourse number 3 is going to be something less than 1 foot-per-second. And all trajectory parameters are still holding real fine.

That's the things we like to hear. We would like to keep those holding very much.

Houston, Apollo 8.

Go ahead.

Roger. We're getting near—we're going to need to dump some urine overboard here. I wonder if that's going to foul your trajectory up. Or can we go ahead and do it?

No, that's okay. Something that is kind of interesting though is that the last time you had your water dump, they noticed a change in the trajectory tracking at the same time and they got through correlating it, they found some fellow that thought he knew the characteristics of a nozzle and how much water you're dumping and his estimates of the effect on the trajectory seemed to coincide with the tracked results. So I guess you have to stay onto some of those things.

Roger. Okay. We'll go ahead and dump it.

Apollo 8, Houston. You can go ahead and run that 37 and we're going to kind of watch that from the ground, too, and see how it works out. A couple of items that are just of general interest in the trajectory world. Looks like the uncertainty in position was about 12 miles. Your uncertainty in velocity is about a quarter of a foot per second. And the perigee altitude of uncertainty is 5 miles.

Roger. Understand. Just for information, perhaps you read it out on the ground. I ran our pericynthian altitude determination using first of all, P21. The star state vector that we navigated with, we have plus 84.7 mile altitude and then we ran out your state vector that you updated with us the last time. We got 64.2 and then I ran P30, using our state vector and got 82.6 nautical miles. These are all plus.

That's good.

What I'm going to attempt to do on P37 is to input your DELTA-V on your TLI plus 44 and use that 44 burn time. I notice that the entry velocity is a little high. We might not be able to do a normal P37, but we'll give it a try.

Roger.

Houston, one more question then before I start. Did you notice on this last update PAD, this minus MA NC-1. Was that referring to the P37 fast return or the nominal maneuver which you gave me?

Apollo 8, that's referring to the fast return procedures.

Houston, Apollo 8.

Go ahead.

Are you following my procedure?

That's affirmative.

Okay. This happened yesterday, too. I'm trying to load the DELTA-V you gave us in the maneuver TLI plus 44 in P37, but I keep getting an operator error everytime I try to load zeros for the termination of the middle and corner. Do you know what I'm doing wrong in my procedure?

Apollo 8, Houston.

Okay, go ahead. I can take it.

Okay, looks like the decimal point in R2 under NOUN 60 is on the extreme right-hand side so the proper load will be 06070. Over.

Apollo 8, Houston. We are about to hand over to another site so you may lose lock momentarily.

Roger, Houston. Did you receive the results of the P37?

Sure did. Looks pretty good here.

Apollo 8; Houston through Honeysuckle. The switch is completed.

You are loud and clear.

Roger.

Houston, Apollo 8.

Go ahead.

Another comment on the optics. We're in PTC right now. We are passing the—we have the roll of about 182; we're about in 226 pitch and 18 in yaw. I can rotate the shaft all the way around at this particular attitude, and I get this band of light at about 10 degrees of this side of the M-line. It—it varies in intensity with the shaft position. However, it is there at this particular attitude.

Okay. Thank you.

Jim, we have just been looking at your marks with respect to accuracy and they figure they are within a couple of thousandths of a degree of the theoretical optimum. The integrator seems to bear that out.

Well, I hope that they are enough to get us home if we have to use them.

Well, I am getting a lot of confidence in your ability to run that mystery show now.

Hey, Jim, we have to spend four more days up here with him, will you take it easy. He is already talking about going back to MIT as a professor.

Hello, Houston. How do you read Apollo 8?

Oh, loud and clear.

You sure do sound wide awake.

Hello, Houston, Apollo 8. How do you read?

Apollo 8, Houston. Read you loud and clear. How me?

Honeysuckle network, GOSS CONFERENCE. How do you read?

Houston, this is Apollo 8. How do you read?

Loud and clear, Apollo 8.

Go ahead Honeysuckle. How do you read?

Well, I would like to say hello to all of you in Australia. How is everything down there?

Pretty good so far. Thank you.

Honeysuckle, Houston network, on GOSS CONFERENCE. How do you read?

Houston network, this is Honeysuckle reading at 5, 5.

Roger.

Apollo 8, Houston.