ACE Weekly 05/13/2015 - 05/19/2015 All ACE spacecraft subsystems are performing as expected. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Orbit/Attitude: Type Attitude Date 05/19/2015 DOY 139 2015 Thrusters 2R 4R+ 4R- Duration 11:41 minutes Start 16:25:06z Stop 16:36:47z ra,decStart 58.26,31.76 ra,decStop 71.17,34.13 ra,decExpect 71.46,34.00 Deviation 0.22 deg (-1.9%) HGAStart -8.51 deg HGAStop +10.99 deg SunStart 12.29 deg SunStop 19.84 deg SpinStart 5.0230 rpm SpinStop 5.0264 rpm Nutation 0.18 deg Firing 59 pulses FuelUsed 0.1804 lbm FuelRemain 98.3336 lbm FinalSCMass 1332.594 lbm Maneuver Scheduling: Next attitude maneuver: Tuesday, 5/26/2015 Next station keeping maneuver: Tuesday, 5/26/2015 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D MOCRs: ACE-355: Relaxing the ACE antenna constraint from 9 to 11 degrees for the 2015 Summer Campaign. Reason for Request: As approved by the ACE Science Working Team (meeting held on May 7-8, 2015) the planned May-19 2015 attitude maneuver will relax the ACE spacecraft high gain antenna (HGA) angle from 9 to 11 degrees. The HGA constraint change will effectively allow slightly higher sun angles= , which in turn will improve the SWEPAM-I density measurement (approximately 5% improvement for each angle increase is expected). =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Activities: Data Capture: 99.999% DOY 130-137 2015 DOY 135 22:16:04 (UT) - 22:16:10 (UT); 6 second gap A proficiency pass with WS1 was scheduled on May 16 (DOY 136). =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Anomalies: DOY 133 05/13/2015 S-ACE-0702: NASCOM Network Problem with Controlled TDF S= witch Description: During the DSS-15 (May 13, 2015) ACE contact (BOT=3D17:20(UT) and EOT: 20:40 (UT)), NASCOM experienced problems with the controlled TDF Switch. NASCOM transferred the M-MOC to the backup switch and took control of the prime NASCOM switch, which the NASCOM Team was going to replace. Following investigation, NASCOM determined that there was nothing physically wrong with the prime switch, and the NASCOM Team concluded that the reset switch had been manually triggered - the switch, if depressed for 8 seconds, clears the configuration. The NASCOM team believes that the reset switch was inadvertently triggered perhaps by the portable hub that is located in the rack. For the future, the NASCOM Team disabled the feature allowing a reset after 8 seconds. The M-MOC System Administrators also relocated the portable hub to a different portion of the rack. Impact: No ACE data loss. However, during the event, the ACE FOT was not able to login into any of the M-MOC workstations. To workaround the issues accessing the LDAP (password) server, the M-MOC System Administrator provided direct M-MOC access to the operational workstations. Once the FOT gained access to the operational system, it was confirmed that the ACE pass procedure was still properly executing. Although, there were no direct indications that the M-MOC/ITOS was not receiving ACE spacecraft telemetry, the FOT independently verified (via inspection of the NOAA SWPC website) that the NOAA center was indeed receiving TLM (the latter data being routed via the M-MOC). DOY 135 05/15/2015 S-ACE-0703: DSS-54 RED due to Transmitter Problem (DR#M1= 08758) Description: The DSN Ops Chief informed the FOT that DSN-54 station was experiencing problems communicating with the TXR hardware (DR # M108758). The Transmitter Controller Assembly was declared RED, but a TLM bit rate of 498 was achieved for the whole support. Effectively, the M-MOC was able to receive low rate ACE telemetry, but had no commanding capabilities during the DSS-54 contact. Impact: Six second data loss on DOY 135. The DSN personnel performed a TXC reboot under maintenance instructions and communications were regained. With the aim of mitigating potential SSR management issues downstream, the FOT worked with the schedulers and converted some of the subsequent ranging passes over the weekend to tracking (with the re-planned working as intended). --_000_D1834A631824CDHumbertoMCalvaninasagov_ Content-Type: text/html; charset="us-ascii" Content-ID: <B6BC5629A5869E41B5333A0ACA0480EA@mail.nasa.gov> Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > </head> <body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin= e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami= ly: Calibri, sans-serif; "> <div style=3D"font-size: medium; font-family: Consolas; ">=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D</div> <div style=3D"font-size: medium; font-family: Consolas; ">ACE Weekly 05/13/= 2015 - 05/19/2015</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">All ACE spacecraf= t subsystems are performing as expected.</div> <div style=3D"font-size: medium; font-family: Consolas; ">=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div> <div style=3D"font-size: medium; font-family: Consolas; ">Orbit/Attitude:</= div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Type &= nbsp; Attitude</div> <div style=3D"font-size: medium; font-family: Consolas; ">Date &= nbsp; 05/19/2015</div> <div style=3D"font-size: medium; font-family: Consolas; ">DOY &n= bsp; 139 2015</div> <div style=3D"font-size: medium; font-family: Consolas; ">Thrusters &n= bsp; 2R 4R+ 4R-</div> <div style=3D"font-size: medium; font-family: Consolas; ">Duration &nb= sp; 11:41 minutes</div> <div style=3D"font-size: medium; font-family: Consolas; ">Start = 16:25:06z</div> <div style=3D"font-size: medium; font-family: Consolas; ">Stop &= nbsp; 16:36:47z</div> <div style=3D"font-size: medium; font-family: Consolas; ">ra,decStart = 58.26,31.76</div> <div style=3D"font-size: medium; font-family: Consolas; ">ra,decStop &= nbsp; 71.17,34.13</div> <div style=3D"font-size: medium; font-family: Consolas; ">ra,decExpect = ; 71.46,34.00</div> <div style=3D"font-size: medium; font-family: Consolas; ">Deviation &n= bsp; 0.22 deg (-1.9%)</div> <div style=3D"font-size: medium; font-family: Consolas; ">HGAStart &nb= sp; -8.51 deg</div> <div style=3D"font-size: medium; font-family: Consolas; ">HGAStop &nbs= p; +10.99 deg</div> <div style=3D"font-size: medium; font-family: Consolas; ">SunStart &nb= sp; 12.29 deg</div> <div style=3D"font-size: medium; font-family: Consolas; ">SunStop &nbs= p; 19.84 deg</div> <div style=3D"font-size: medium; font-family: Consolas; ">SpinStart &n= bsp; 5.0230 rpm</div> <div style=3D"font-size: medium; font-family: Consolas; ">SpinStop &nb= sp; 5.0264 rpm</div> <div style=3D"font-size: medium; font-family: Consolas; ">Nutation &nb= sp; 0.18 deg</div> <div style=3D"font-size: medium; font-family: Consolas; ">Firing  = ; 59 pulses</div> <div style=3D"font-size: medium; font-family: Consolas; ">FuelUsed &nb= sp; 0.1804 lbm</div> <div style=3D"font-size: medium; font-family: Consolas; ">FuelRemain &= nbsp; 98.3336 lbm</div> <div style=3D"font-size: medium; font-family: Consolas; ">FinalSCMass = 1332.594 lbm</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Maneuver Scheduli= ng:</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Next attitude man= euver: Tuesday, 5/26/2015</div> <div style=3D"font-size: medium; font-family: Consolas; ">Next station keep= ing maneuver: Tuesday, 5/26/2015</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div> <div style=3D"font-size: medium; font-family: Consolas; ">MOCRs:</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">ACE-355: Relaxing= the ACE antenna constraint from 9 to 11 degrees for</div> <div style=3D"font-size: medium; font-family: Consolas; ">the 2015 Summer C= ampaign.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Reason for Reques= t: As approved by the ACE Science Working Team (meeting </div> <div style=3D"font-size: medium; font-family: Consolas; ">held on May 7-8, = 2015) the planned May-19 2015 attitude maneuver will relax</div> <div style=3D"font-size: medium; font-family: Consolas; ">the ACE spacecraf= t high gain antenna (HGA) angle from 9 to 11 degrees. </div> <div style=3D"font-size: medium; font-family: Consolas; ">The HGA constrain= t change will effectively allow slightly higher sun angles, </div> <div style=3D"font-size: medium; font-family: Consolas; ">which in tur= n will improve the SWEPAM-I density measurement (approximately</div> <div style=3D"font-size: medium; font-family: Consolas; ">5% improveme= nt for each angle increase is expected).</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div> <div style=3D"font-size: medium; font-family: Consolas; ">Activities:</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Data Capture:&nbs= p; 99.999% DOY 130-137 2015</div> <div style=3D"font-size: medium; font-family: Consolas; "><span class=3D"Ap= ple-tab-span" style=3D"white-space: pre; "></span>DOY 135 22:16:04 (UT)&nbs= p; - 22:16:10 (UT); 6 second gap</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">A proficiency pas= s with WS1 was scheduled on May 16 (DOY 136).</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div> <div style=3D"font-size: medium; font-family: Consolas; ">Anomalies:</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">DOY 133 05/13/201= 5 S-ACE-0702: NASCOM Network Problem with Controlled TDF Switch</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Description:</div= > <div style=3D"font-size: medium; font-family: Consolas; ">During the DSS-15= (May 13, 2015) ACE contact (BOT=3D17:20(UT) and EOT:</div> <div style=3D"font-size: medium; font-family: Consolas; ">20:40 (UT)), NASC= OM experienced problems with the controlled TDF Switch.</div> <div style=3D"font-size: medium; font-family: Consolas; ">NASCOM transferre= d the M-MOC to the backup switch and took control of the</div> <div style=3D"font-size: medium; font-family: Consolas; ">prime NASCOM swit= ch, which the NASCOM Team was going to replace.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Following investi= gation, NASCOM determined that there was nothing</div> <div style=3D"font-size: medium; font-family: Consolas; ">physically wrong = with the prime switch, and the NASCOM Team concluded</div> <div style=3D"font-size: medium; font-family: Consolas; ">that the reset sw= itch had been manually triggered - the switch, if</div> <div style=3D"font-size: medium; font-family: Consolas; ">depressed for 8 s= econds, clears the configuration. The NASCOM team</div> <div style=3D"font-size: medium; font-family: Consolas; ">believes that the= reset switch was inadvertently triggered perhaps by</div> <div style=3D"font-size: medium; font-family: Consolas; ">the portable hub = that is located in the rack.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">For the future, t= he NASCOM Team disabled the feature allowing a reset</div> <div style=3D"font-size: medium; font-family: Consolas; ">after 8 seconds.&= nbsp; The M-MOC System Administrators also relocated the</div> <div style=3D"font-size: medium; font-family: Consolas; ">portable hub to a= different portion of the rack.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Impact:</div> <div style=3D"font-size: medium; font-family: Consolas; ">No ACE data loss.= However, during the event, the ACE FOT was not able</div> <div style=3D"font-size: medium; font-family: Consolas; ">to login into any= of the M-MOC workstations. To workaround the issues</div> <div style=3D"font-size: medium; font-family: Consolas; ">accessing the LDA= P (password) server, the M-MOC System Administrator</div> <div style=3D"font-size: medium; font-family: Consolas; ">provided direct M= -MOC access to the operational workstations. Once the</div> <div style=3D"font-size: medium; font-family: Consolas; ">FOT gained access= to the operational system, it was confirmed that the</div> <div style=3D"font-size: medium; font-family: Consolas; ">ACE pass procedur= e was still properly executing.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Although, there w= ere no direct indications that the M-MOC/ITOS was not</div> <div style=3D"font-size: medium; font-family: Consolas; ">receiving ACE spa= cecraft telemetry, the FOT independently verified (via</div> <div style=3D"font-size: medium; font-family: Consolas; ">inspection of the= NOAA SWPC website) that the NOAA center was indeed</div> <div style=3D"font-size: medium; font-family: Consolas; ">receiving TLM (th= e latter data being routed via the M-MOC).</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">DOY 135 05/15/201= 5 S-ACE-0703: DSS-54 RED due to Transmitter Problem (DR#M108758)</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Description:</div= > <div style=3D"font-size: medium; font-family: Consolas; ">The DSN Ops Chief= informed the FOT that DSN-54 station was experiencing</div> <div style=3D"font-size: medium; font-family: Consolas; ">problems communic= ating with the TXR hardware (DR # M108758). The</div> <div style=3D"font-size: medium; font-family: Consolas; ">Transmitter = Controller Assembly was declared RED, but a TLM bit rate of </div> <div style=3D"font-size: medium; font-family: Consolas; ">498 was achi= eved for the whole support. Effectively, the M-MOC was able</div> <div style=3D"font-size: medium; font-family: Consolas; ">to receive l= ow rate ACE telemetry, but had no commanding capabilities </div> <div style=3D"font-size: medium; font-family: Consolas; ">during the D= SS-54 contact.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">Impact:</div> <div style=3D"font-size: medium; font-family: Consolas; ">Six second data l= oss on DOY 135. The DSN personnel performed a TXC reboot</div> <div style=3D"font-size: medium; font-family: Consolas; ">under mainte= nance instructions and communications were regained.</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; ">With the aim of m= itigating potential SSR management issues downstream, </div> <div style=3D"font-size: medium; font-family: Consolas; ">the FOT work= ed with the schedulers and converted some of the subsequent</div> <div style=3D"font-size: medium; font-family: Consolas; ">ranging pass= es over the weekend to tracking (with the re-planned working as</= div> <div style=3D"font-size: medium; font-family: Consolas; ">intended).</div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> <div style=3D"font-size: medium; font-family: Consolas; "><br> </div> </body> </html> --_000_D1834A631824CDHumbertoMCalvaninasagov_--