SOT shift report 2001-05-29 M677
Start at 2001:149:17:00 GMT
       = 2001 May 29 01:00pm EDT
End                  03:00pm EDT


SOT Lead	Mark Freeman

Plan:

OBSID 02016, NGC4382 (M85) 2001:149:14:43, ACIS-S NONE - RESOLVING
THE X-RAY BINARY POPULATION IN EARLY-TYPE GALAXIES "spatially resolve
the emission from 4 ... X-ray faint early-type galaxies."

Radiation situation is not critical, but the accumulated fluence
since perigee is high and the flux levels unstable.  See note 1.

Events						GMT	OBSID
----------------------				----	-----
Start shift					1700
AOS (DSS-34)					1730
Chandra status nominal (note 2)			1743	02016
LOS						1830
End shift					1900

NOTES/ISSUES/PROBLEMS
---------------------

(1) RADIATION SUMMARY				Observed Limit

ACE 2 hr fluence 				8.3e6	 3.6e8.
*ACIS* Orbital fluence (since perigee)		8.9e8	 1.0e9.

Note that orbital fluence is approaching the basics limit of 1.0e+09
(although I the current cumulative ACIS dose plots show red limit of 2e9).
At the current flux of about 1.2e+03, we would exceed the 1e9 limit in 
about 24 hrs, by which time we would be safed for the next perigee
passage.  However, the rates are unstable and currently on a slight upward
slope, so though not exceptionally risky, the situation bears watching.

(2) Chandra's state was:

UTC 2001:149:17:43:24 (May29) f_ACE 1.19e+03 F_CRM 8.87e+08 Kp 2.7 R km 131727D
OBT 2001:149:17:43:00  CTUVCDU  6352031  OBC s/w NRML  FMT2_SSR    CPEstat NORM
OBT      107545380.29  ONLVCDU  6352016  OBC Errs   0
                                                     OBSID   2016  EPState  SUN
SIM TTpos   75623  HETG Angle 79.84  PCADMODE NPNT   RA   186.338  Bus V  31.02
SIM FApos    -467  LETG Angle 77.96  PCONTROL NPNT   Dec   18.198  Bus I  24.69
                                     AOFSTAR  GUID   Roll 238.479
ACA Object FFFSSSSS    Dither  ENAB                                HRC-I HV OFF
ACA ImFunc TTTTTTTT    Dith Yang   7.79    Yaw Rate     -0.13      HRC-S HV  ON
ACA CCD Temp  -10.4    Dith Zang  -1.52    Pitch Rate   -0.01      OBSMode NEXT
ACA Int Time  1.698                        Roll Rate    -0.07      Door OP UNAC
AOACSTAT         OK    FSS SunBeta  SUN                            Door CL UNAC
                       FSS Alfa   -0.29    Batt 1 SOC  100.00%
Avg HRMA Temp 70.61    FSS Beta  -19.05    Batt 2 SOC  100.00%  ACIS Stat7-0 65
Avg OBA Temp  51.05    SA Resolv 109.04    Batt 3 SOC  100.00%  Cold Rad -127.9
OBA Tavg Fault NFLT    SA Sun Pres ILLM                         Warm Rad  -82.0
OBA Trng Fault NFLT                        +Y SA Amps   11.79   RadMon     ENAB
HRMA power     0.00    SCS 128   ACT       -Y SA Amps   12.76   EPHIN Geom LARG
OBA power    102.50    SCS 129   ACT       +Y SA Temp  109.58   E150        1.6
                       SCS 130   ACT       -Y SA Temp  109.58   E300        0.1
Roll Mom.    -2.028    SCS 107  INAC                            E1300       0.0
Pitch Mom.    0.868   UpL Cmd Acc  13082   EPH A-Leak  1.0200   P4GM        0.0
Yaw Mom.     10.103   Cmd Rej A      105   EPH B-Leak  0.2680   P41GM       0.0

(3) CDE on 'coot' had died before the current shift.  Needed to reboot
    and restart the typical process set.


See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_29_2001_M677.txt