Dear ASCA users, The intense shower of Leonid meteors is expected to appear on November 17. The peak of the shower is estimated to be around 19:00 (UT), but significant error would be happen on the shower maximum time. Hence to avoid possible risk of damage on ASCA due to the hits by meteors, we wish to move the ASCA XRT axis toward anti-direction to the shower stream and to set the solar paddle parallel to the stream to minimize the impact for the two days from November 16 to November 18. Fortunately, we find one (and only one) target that satisfy the required ASCA attitude, that is NGC 7252. Hence, we decided to direct ASCA for about two days toward NGC 7252. Awaki-san (PI of NGC 7252) would be a lucky-boy to receive exposure twice larger than the approved time, if there is no serious impact from the Leonid meteor shower and operation/observation progress normally. Leighly's targets once allocated in the span will be shifted to the next schedule, and Itoh's M108 is replaced to the span of November 9, once NGC 7252 was there. F. Nagase ----------------------------------------------------------------------------- A S C A WEEKLY OBSERVATION PLAN ----------------------------------------------------------------------------- November 9 - 22, 1998, ver-2 (98/10/13) (ISAS contact scientist: M.ISHIDA (ishida@astro.isas.ac.jp) ----------------------------------------------------------------------------- Date MNV Target Tag. Exp. Observation PI or start name Cat. (ks) Cat. Pri./TC ( PPI/Co-PI) ----------------------------------------------------------------------------- 11/ 9 18:40 M108 Gal. 40 JPN 2/n M. Itoh 11/10 15:20 Syg Loop S1 SNR 13 JPN 1/n E. Miyata (AO-6 Supplement) 11/11 1:00 Mrk 1224 AGN 40 JPN 2/n M. Imanishi 11/12 4:40 PG 0946+301 AGN 100 USJ 2/n P. Green 11/14 16:50 Mrk 705 AGN 35 ESJ 3/n M. Pfeiffer 11/15 16:20 1055+5644 AGN 40 ESJ 2/n J. Siebert 11/16 16:30 NGC 7252 GAL 40 JPN 3/n H. Awaki 11/18 17:40 SC 2357-610 #1 CG 50 JPN 2/n M. Tashiro 11/20 6:10 SC 2357-610 #2 CG 50 JPN 2/n M. Tashiro 11/21 12:30 MS 2254-37 AGN 30 USJ 2/n K. Leighly (11/22 11:20, MNV to next target) ----------------------------------------------------------------------------- (Note) Obs. Cat. JPN: Japan time, US: US time, JUS: Japan-US Collaboration, USJ: US-Japan Collaboration, MJU: Merged Japan-US (PPI=Japan), MUJ: Merged US-Japan (PPI=US), ESJ: ESA-Japan Program, MOT: Observatory Time (Calibration, maintenance), and TOO: Target of Opportunity