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: Content-Transfer-Encoding: quoted-printable
=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D
ACE Weekly 05/13/= 2015 - 05/19/2015

All ACE spacecraf= t 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  &= nbsp;        Attitude
Date  &= nbsp;        05/19/2015
DOY  &n= bsp;         139 2015
Thrusters &n= bsp;    2R 4R+ 4R-
Duration &nb= sp;     11:41 minutes
Start  =         16:25:06z
Stop  &= nbsp;        16:36:47z
ra,decStart =    58.26,31.76
ra,decStop &= nbsp;   71.17,34.13
ra,decExpect = ;  71.46,34.00
Deviation &n= bsp;     0.22 deg (-1.9%)
HGAStart &nb= sp;     -8.51 deg
HGAStop &nbs= p;     +10.99 deg
SunStart &nb= sp;     12.29 deg
SunStop &nbs= p;      19.84 deg
SpinStart &n= bsp;   5.0230 rpm
SpinStop &nb= sp;    5.0264 rpm
Nutation &nb= sp;      0.18 deg
Firing  = ;       59 pulses
FuelUsed &nb= sp;      0.1804 lbm
FuelRemain &= nbsp;   98.3336 lbm
FinalSCMass =   1332.594 lbm

Maneuver Scheduli= ng:

Next attitude man= euver:         Tuesday, 5/26/2015
Next station keep= ing 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 C= ampaign.

Reason for Reques= t: 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 spacecraf= t high gain antenna (HGA) angle from 9 to 11 degrees. 
The HGA constrain= t change will effectively allow slightly higher sun angles, 
which in tur= n will improve the SWEPAM-I density measurement (approximately
5% improveme= nt 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:&nbs= p; 99.999%  DOY 130-137 2015
DOY 135 22:16:04 (UT)&nbs= p; - 22:16:10 (UT); 6 second gap

A proficiency pas= s 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 05/13/201= 5 S-ACE-0702: NASCOM Network Problem with Controlled TDF Switch

Description:
During the DSS-15= (May 13, 2015) ACE contact (BOT=3D17:20(UT) and EOT:
20:40 (UT)), NASC= OM experienced problems with the controlled TDF Switch.
NASCOM transferre= d the M-MOC to the backup switch and took control of the
prime NASCOM swit= ch, which the NASCOM Team was going to replace.

Following investi= gation, NASCOM determined that there was nothing
physically wrong = with the prime switch, and the NASCOM Team concluded
that the reset sw= itch had been manually triggered - the switch, if
depressed for 8 s= econds, 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, t= he NASCOM Team disabled the feature allowing a reset
after 8 seconds.&= nbsp; 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 LDA= P (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 procedur= e was still properly executing.

Although, there w= ere no direct indications that the M-MOC/ITOS was not
receiving ACE spa= cecraft telemetry, the FOT independently verified (via
inspection of the= NOAA SWPC website) that the NOAA center was indeed
receiving TLM (th= e latter data being routed via the M-MOC).


DOY 135 05/15/201= 5 S-ACE-0703: DSS-54 RED due to Transmitter Problem (DR#M108758)

Description:
The DSN Ops Chief= informed the FOT that DSN-54 station was experiencing
problems communic= ating with the TXR hardware (DR # M108758). The
Transmitter = Controller Assembly was declared RED, but a TLM bit rate of 
498 was achi= eved for the whole support. Effectively, the M-MOC was able
to receive l= ow rate ACE telemetry, but had no commanding capabilities 
during the D= SS-54 contact.

Impact:
Six second data l= oss on DOY 135. The DSN personnel performed a TXC reboot
under mainte= nance instructions and communications were regained.

With the aim of m= itigating potential SSR management issues downstream, 
the FOT work= ed with the schedulers and converted some of the subsequent
ranging pass= es over the weekend to tracking (with the re-planned working as
intended).


--_000_D1834A631824CDHumbertoMCalvaninasagov_--