SSOC Tohban Report for Week 49 (5 - 11 December 1994) KSC : M.Takahashi and T.Takano SSOC: Dhani H. and H.Tonooka 1. Solar Activity ------------------------------------------------------------ Solar activity has been roughly calm in this week, but C-class flares were observed in some active regions. 2. Standard Operation -------------------------------------------------------- 2.1 SXT Table Uploads DATE TABLE ID 5 Dec pass 2: 941205 P2 MONDAY 6 Dec pass 4: 941206 P4 ARS1 DKCAL FAST 7 Dec pass 2: 941207 P2 WEDNESDAY 8 Dec pass 2: 941208 P2 THURSDAY 9 Dec pass 2: 941209 P2 FRIDAY 10 Dec pass 2: 941210 P2 SATURDAY pass 4: 941210B P4 SATURDAY-2 2.2 STT Timer Set STT Timer was set on Monday (Pass2 on 5 Dec-94). 2.3 OG write A set of new OGs for the terminator image was written on pass 1, 6 Dec. New OGs are the followings, each value for the angle is the differences with the current normal pointing. OG 35(decimal): "EAST" east 6.09 arcmin OG 36(decimal): "WEST" west 3.15 arcmin OG 87(decimal): "NORMAL" east 2.08 arcmin 2.4 S/C off pointing To obtain the terminator images for correction of the Spartan93 observations held on 11-12 April 1993, the OGs above were used on some opportunities for the terminator observations. 3. Special Operation ------------------------------------------------------- Terminators: We are expected to take the terminator images with new OGs for 9 Dec (16:33:35) and 10 Dec (07:08:47). See 4.2.2. 4. Errors & Problems -------------------------------------------------------- 4.1 K S C 1. A trouble on MS on Monday After ASUKA's final operation at 7:00(jst) to 16:20(jst), MS had been down because of cooler trouble, and re-started at 16:20(jst). Then, since the SXT table had not arrived, KSC tohban picked up the table from SSOC computer at 19:10(jst), and uploaded it. 2. Failure of receiving new orbital element for KSC, even now!! New orbital element has not arrived to KSC from Wednesday afternoon, so that they could not print out the Week Visible Diagram. SSOC made temporary format of the Week Visible Diagram, after discussing with KSC. This caused delay for fixing conflicts with ASUKA. We asked to Syutou-san to check it and KSC tohban has asked to FACOM technician also. 3. 20m antenna. Before the AOS of Pass1 on Tuesday, the operator did not set the antenna to REMOTE status, and the antenna was not in position to catch the satellite. Recovery by manual operation could track the satellite again succesfully. 4.2 S S O C 1. SXT error On the Pass1 on Tuesday, the SXT error was occured. Its status was "SXT ERR 2 UERR DATRG". Recovery on Pass2 was successfully done. 2. Misunderstanding of the operation for offpointing No offpointing observation. Actually two sets of terminator with 35(dec) and 36(dec) OGs were appeared on Friday. However, SSOC tohbans did not recognize the operation written on SXT FAX. When we found it, OP was already sent to the spacecraft. We tried to revise one, but we did not have enough time to do that. We are very sorry for this failure operation. We inserted the 35(dec) OG command on Monday, 12 Dec. 5. DSN Communications ------------------------------------------------------ 5.1 DSN Strawman Schedule for W52 We got the strawman schedule on Friday, and cancelled 11 DSN passes. There were 3 DSN conflict passes with ASUKA on that week. 5.2 DSN Preliminary Schedule for W51 No cancellation was done. 5.3 DSN Final Schedule for W49 and W50 There were that too many contact during the holiday, so we cancelled 2 of W49 and 1 for w50 on Friday. Two cancellations of W50 were already done on Wednesday just after we got the latest one. 6. Yohkoh/ASCA Pass Conflicts -------------------------------------------- In the week 49, 2 KCS conflict passes with ASCA occured on pass5 of 7.Dec and 8.Dec. In the week 50, 4 conflict passes will appear on pass5 of 12.Dec, pass4 of 13.Dec, and both of pass5 and 6 of 16 Dec. Conflicts with ASCA for the week 52 strawman schedule were resolved in a meeting between Katano-san, Hudson-san and Skinner-san on Friday. 7. Holiday Schedule ------------------------------------------------------- The next holiday will be on Sunday Dec 18. 8. Hikitsugi Items -------------------------------------------------------- 8.1 Tohbans for Week 50 SSOC : T.Shinkawa and K.Marubashi K S C: M.Takahashi and S.Masuda(from 16.Dec) 8.2 STT timer setting The next STT timer set is due on Monday (12-Dec-94). It has already been prepared. Please prepare the next one. 8.3 Offpoint terminator images An interval between 'DAY' and 'CMPN OBS OFF' OGs is 6 blocks. 'OP_FIRST_GUESS' says that it is 4 blocks, so tohban-sans have to change it to 6 blocks on the mainframe.