thermocalc
Active member
Hi, actually sorry to give you wrong information, but as I said your video worked for me as a tutorial and thanks to it and your latest comments I understood what I was doing wrong all times when using P23 with landmarks; also the real G&C checklists at page 20 of the document "A8-CMP checklist-1004" where it describes P23 helped me a lot to make progresses (sorry I don't know how to put a link to this file) but I am sure you should have come across this doc already....if not, I downloaded it in the "document sections" of the virtual AGC website under Apollo 8 documents....checklists....if I am not mistaken - don't remember exactly where).
If I do as you have done I got more or less the same problems … I end up floating over the Pacific near Venezuela coasts.... but looking at the G&C checklist I was puzzled by the fact that upon entering information in F 05 70 it never asked for the F 06 89 to enter LAT/LONG/2 and ALT … as far as I have understood, for landmarks sighting/marking in Earth orbit you need to enter LAT-LONG/2 and ALT when asked for, while in lunar orbit you may use some LMK codes stored into the AGC … for Apollo 8 there is only code 01 which is the pseudo landing site B-1 (I used it many times in P22 while in lunar orbit, while for CP-1, -2 and -3 I entered their coordinates as written on the flight plan)…so I suppose that setting 00110 in R2 is wrong, as the code #10 is not supported while in Earth orbit … this seems to be confirmed also by the original checklists, where for star/landmark it says to enter: R1 000DE, R2 00100 (Earth orbit), R3 00000; while in Lunar orbit it says to set for R2 002XX where XX is the stored AGC LMK code....the G&C checklist in the doc format is no clear about that....
ANYWAY, here what I did and it worked well.
After V37E 23E I entered on F 05 70 the following information: 00015, 00100, 00000, after PRO I got F 05 89 and I entered the coordinates of Punta Yoyameko = P.Y. in short (+29039 -56292 +00010), after PRO I got the auto-maneuver done and the LMK was there in the SXT (I had to use RCS in impulse mode to center it and KILL ROT to keep it steady … I know cheating a little bit here), than OPT CMC and in the SCT I got star 15, back to SXT, “V” and superimpose, after the mark I got again F 05 71 with 00015, 00100, 00000 and after PRO I got again F 05 89 with the old P.Y. coordinates … PRO and I got DR=+00053, DV=+00017, which I accepted!
I repeated all over again with star 16, 00016, 00100, 00000, this time the coordinates of P.Y. where already there, I move the CSM out of alignment to check if the auto-maneuver was finding the LMK again and it did…some story, small IMP jests, kill rot, star acquisition and marking and I got 000xx errors again.
Last I tried to mark another LMK: I did all over again, star 15 and P.Y. coordinates and when centered to P.Y. I manually moved out of alignment to see/center in the SXT Punta Parinas (LMK 110 on Apollo Earth Landmark document in the NASSP doc folder) … I center it into the SXT, kill rot again, than OPT CMC, star 15 in the SCT, back to SXT view, V, superimpose and mark. At F 05 71 still the same information: 00015, 00100, 00000, and when F 05 89 the old P.Y. coordinates where there, but I entered the new coordinates of Punta Parinas, -04699, -40664, -00253 PRO and I got a DR and a DV of the order of 000xx again.
So you can change the LMK coordinates later on, after the mark is done, you don’t need to stick to the original LMK entered at the beginning (I suppose this freedom is there as you don’t know in real life if the LMK will be visible or not, so you must have the possibility to change and mark a visible one…)....by the way the same is valid also during P52....if you mark another stars different from the one chosen when in F 05 50 as soon as you notify to the AGC in F 05 51 the new star code used in reality you alignment is still valid.
What is suspicious is why there is the possibility to enter a CODE (DE) in R2 while in Earth Orbit, but as said at the beginning the original checklist for P23 didn't allow this entry: so I am still puzzled, as after all it seems that entering the code 10 (I mean R2 00110) the AGC do something, it moves the CSM, but maybe the coordinates stored under code 10 are not the ones corresponding to Punta Yoyameko that’s why after the auto-maneuver we always end up in the middle of the pacific near Venezuela cost…maybe it simply means that we were not suppose to enter such kind of code ...
out of curiosity let’s see if some developers will tell us more details or if we are doing right or wrong this time
thanks.
Paolo
If I do as you have done I got more or less the same problems … I end up floating over the Pacific near Venezuela coasts.... but looking at the G&C checklist I was puzzled by the fact that upon entering information in F 05 70 it never asked for the F 06 89 to enter LAT/LONG/2 and ALT … as far as I have understood, for landmarks sighting/marking in Earth orbit you need to enter LAT-LONG/2 and ALT when asked for, while in lunar orbit you may use some LMK codes stored into the AGC … for Apollo 8 there is only code 01 which is the pseudo landing site B-1 (I used it many times in P22 while in lunar orbit, while for CP-1, -2 and -3 I entered their coordinates as written on the flight plan)…so I suppose that setting 00110 in R2 is wrong, as the code #10 is not supported while in Earth orbit … this seems to be confirmed also by the original checklists, where for star/landmark it says to enter: R1 000DE, R2 00100 (Earth orbit), R3 00000; while in Lunar orbit it says to set for R2 002XX where XX is the stored AGC LMK code....the G&C checklist in the doc format is no clear about that....
ANYWAY, here what I did and it worked well.
After V37E 23E I entered on F 05 70 the following information: 00015, 00100, 00000, after PRO I got F 05 89 and I entered the coordinates of Punta Yoyameko = P.Y. in short (+29039 -56292 +00010), after PRO I got the auto-maneuver done and the LMK was there in the SXT (I had to use RCS in impulse mode to center it and KILL ROT to keep it steady … I know cheating a little bit here), than OPT CMC and in the SCT I got star 15, back to SXT, “V” and superimpose, after the mark I got again F 05 71 with 00015, 00100, 00000 and after PRO I got again F 05 89 with the old P.Y. coordinates … PRO and I got DR=+00053, DV=+00017, which I accepted!
I repeated all over again with star 16, 00016, 00100, 00000, this time the coordinates of P.Y. where already there, I move the CSM out of alignment to check if the auto-maneuver was finding the LMK again and it did…some story, small IMP jests, kill rot, star acquisition and marking and I got 000xx errors again.
Last I tried to mark another LMK: I did all over again, star 15 and P.Y. coordinates and when centered to P.Y. I manually moved out of alignment to see/center in the SXT Punta Parinas (LMK 110 on Apollo Earth Landmark document in the NASSP doc folder) … I center it into the SXT, kill rot again, than OPT CMC, star 15 in the SCT, back to SXT view, V, superimpose and mark. At F 05 71 still the same information: 00015, 00100, 00000, and when F 05 89 the old P.Y. coordinates where there, but I entered the new coordinates of Punta Parinas, -04699, -40664, -00253 PRO and I got a DR and a DV of the order of 000xx again.
So you can change the LMK coordinates later on, after the mark is done, you don’t need to stick to the original LMK entered at the beginning (I suppose this freedom is there as you don’t know in real life if the LMK will be visible or not, so you must have the possibility to change and mark a visible one…)....by the way the same is valid also during P52....if you mark another stars different from the one chosen when in F 05 50 as soon as you notify to the AGC in F 05 51 the new star code used in reality you alignment is still valid.
What is suspicious is why there is the possibility to enter a CODE (DE) in R2 while in Earth Orbit, but as said at the beginning the original checklist for P23 didn't allow this entry: so I am still puzzled, as after all it seems that entering the code 10 (I mean R2 00110) the AGC do something, it moves the CSM, but maybe the coordinates stored under code 10 are not the ones corresponding to Punta Yoyameko that’s why after the auto-maneuver we always end up in the middle of the pacific near Venezuela cost…maybe it simply means that we were not suppose to enter such kind of code ...
out of curiosity let’s see if some developers will tell us more details or if we are doing right or wrong this time
thanks.
Paolo