ASCA Weekly

[Fumiaki NAGASE <nagase@astro.isas.ac.jp>]

Dear ASCA users:

The replacement of S1 gyro to S2 gyro and first tuning of on-board 
parameters have been successfully finished till December 3.  Attitude 
pointing stability after locked to the tracking stars is fine but yet small 
errors arose after  large angle maneuvers at the time after December 3, 
which were adjusted every time at the contact passes of KSC. Based on 
the result of a large angle maneuver on December 4, we have refined the 
on-board ACS parameters on December 7. After then, the two large angle 
maneuvers between Dec. 7 and Dec. 8 were successful with required 
accuracy.

Since December 2,  we have been observing the scheduled targets in 
parallel with the refinement of the ACS system. I believe that we are able 
hereafter to continue stable operation along the scheduled observation 
plan. High priority targets, which were scheduled but left unobserved 
during the event, will be rescheduled in the revised long-term timeline. 
The revised long-term timeline will be released next week.

In the following, I have attached an weekly observation plan for the rest of 
this year.

Fumiaki Nagase

Note for the last ASCA Weekly:
	3C273 and 3C279, both  allocated on Dec. 16, are both the first
	10 ks of the four times observations simultaneous with GRO 
	observations. 3C273 is a Japanese proposal by F. Makino and 3C279 is
	a joint Japan/US proposals, by F. Makino (PPI) and J. Kurfess (Co-PI).


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A S C A     WEEKLY  OBSERVATION   PLAN
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 December 18 - 28,  1993:  
(ISAS contact scientist:   M. Ishida,  ishida@astro.isas.ac.jp)
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Date	MNV	Target 		Tag. 	Exp.	Observation		 	
	start	name		Cat.	(ks)	Cat.  Pri./TC	PI (or PPI)	
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12/18	 2:20	Mkn 766		AGN	40	USJ	2/Y	K. Leighly
							(ROSAT simultaneous)
12/19	 0:40	NGC7383		AGN	40	US	2/n	I. George

12/19	21:30	MR2251-178	AGN	10	JPN	2/Y	T. Otani

12/20	 6:40	3C273 (No. 2)	AGN	10	JPN	2/Y	F. Makino
							(GRO simultaneous)
12/20	13:40	3C273 (Cal. 2)	AGN	40	PV  (SIS Cal. SIS-team)
						
12/21	12:00	3C279 (No. 2)	AGN	10	JUS	2/Y	Makino/Kurfess
							(GRO simultaneous)
12/21	19:50	Deep S. (Area-5) CXB	80	JPN	1/n	T. Kii

12/23	16:30	3C279 (No. 3)	AGN	10	JUS	2/Y	Makino/Kurfess
							(GRO simultaneous)
12/23	23:00	3C273 (No. 3)	AGN	10	JPN	2/Y	F. Makino
							(GRO simultaneous)
12/24	 5:40	MR2251-178	AGN	10	JPN	2/Y	T. Otani

12/24	13:00	Deep S. (Area-5) CXB	80	JPN	1/n	T. Kii

12/26	10:20	MSS (Point-A)	CXB	40	JPN	1/n	T. Tsuru

12/27	10:10	3C273 (No. 4)	AGN	10	JPN	2/Y	F. Makino
							(GRO simultaneous)
12/27	18:00	3C279 (No. 4)	AGN	10	JUS	2/Y	Makino/Kurfess
							(GRO simultaneous)
12/28	 0:30	PSR1259-63	Bin.	20	USJ	1/Y	Tavani/Nagase
							(Phase constrainted)
12/28	12:50	Deep S. (Area-5) CXB	80	JPN	1/n	T. Kii

(Last ASCA operation in 1993; pass-5 (20:34-20:46 UT) on 1993 Dec. 28 
 First ASCA operation in 1994; pass-1 (10:15-10-26 UT) on 1994 Jan. 4)
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