Fid Drop: 2679

Fid Drop in Obsid 2679

2679 does not present a displacement before the fid drop. The pixel that suddenly appears very bright is likely due to a cosmic ray event. (Now that we're looking at pcad data too, could there be a displacement we don't see?, or is this drop solely due to the background change?) I'm not sure what to make of the BGDAVG values in the aca0 data... because those numbers don't match the numbers visible in aca_movie.pl .

ACA0 and PCAD0 telemetry around event

aca0	Time	D_Time	IMGFUNC1	BGDAVG	BGDRMS	BGDSTAT	IMGROW0	IMGCOL0
aca0	122559701.95	-14.18	1	21	9	255	366	34
aca0	122559706.05	-10.08	1	22	8	255	366	34
aca0	122559710.15	-5.98	1	22	7	255	366	34
aca0	122559714.25	-1.88	3	1023	1023	255	366	34
aca0	122559718.35	2.22	0	511			511	511
aca0	122559719.38	3.25	0	511			511	511
aca0	122559720.40	4.27	0	511			511	511
aca0	122559721.43	5.30	0	511			511	511
aca0	122559722.45	6.32	0	511			511	511
aca0	122559723.48	7.35	0	511			511	511
aca0	122559724.50	8.37	0	511			511	511

pcad0	Time	D_Time	AOACHIBK	AOPCADMD	AOACASEQ	AOACYAN	AOACZAN
pcad0	122559701.78	-14.35	OK	NPNT	KALM	-1813.05	166.62
pcad0	122559703.83	-12.30	OK	NPNT	KALM	-1813.05	166.65
pcad0	122559705.88	-10.25	OK	NPNT	KALM	-1813.05	166.65
pcad0	122559707.93	-8.20	OK	NPNT	KALM	-1813.03	166.65
pcad0	122559709.98	-6.15	OK	NPNT	KALM	-1813.03	166.65
pcad0	122559712.03	-4.10	OK	NPNT	KALM	-1813.05	166.65
pcad0	122559714.08	-2.05	OK	NPNT	KALM	-1813.03	166.65
pcad0	122559716.13	-0.00	OK	NPNT	KALM	-3276.80	-3276.80
pcad0	122559718.18	2.05	OK	NPNT	KALM	-3276.80	-3276.80
pcad0	122559720.23	4.10	OK	NPNT	KALM	-3276.80	-3276.80
pcad0	122559722.28	6.15	OK	NPNT	KALM	-3276.80	-3276.80

ACA0 pictures

Each picture is also a link to the full aca_movie screen shot.

Last modified:04/12/06

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory.
60 Garden Street, Cambridge, MA 02138 USA. Email: aspect_help@head.cfa.harvard.edu
Smithsonian Institution, Copyright © 1998-2004. All rights reserved.