rodsladen@crosswinds.net ("Rod Sladen") writes: > 1. Double flares may actually be fairly common, but are missed ... > Only if checking timings or positions carefully is is evident that the > flare is not symmetric about the predicted flare maximum time. Following up my earlier message referencing http://www2.satellite.eu.org/seesat/Jul-1998/0367.html and http://www2.satellite.eu.org/seesat/Sep-1998/0013.html : I ran an old version of IRIDFLAR, reaching deep into the realm of faintness, and this is what it generated for 2001-03-23, only a few hours prior to the ditching of the Mir Complex: Iridium Coordinates Range Sat Solar Peak Std Maximum Flare Ir Date Time Azm El RA Decl (km) N Ill Azm Elev M FlrAng Mag Mag Mag Latitude Longitude 53 1- 3-23 1:13:45.0 110 41 10h58 13.7 1125.7 D Lit 288 -17.2 R 8.33 4.6 -8.0 4.3 41.0754 -79.3979 84 1- 3-23 1:22:48.2 115 50 10h29 17.5 987.3 D Lit 289 -18.8 R 0.48 -3.3 -8.2 -3.3 41.3607 -81.7416 9 1- 3-23 1:31:55.0 127 60 9h48 20.1 889.9 D Lit 291 -20.4 R 9.45 4.5 -8.4 4.6 41.4335 -83.9921 which I reformatted to be consistent with my archaic version of QuickSat: 1 13 45 ? 41 110 D 4.6 1125 1058 13.7 Iridium 53 1 22 48 ? 50 115 D -3.3 987 1029 17.5 Iridium 84 1 31 55 ? 60 127 D 4.5 889 948 20.1 Iridium 9 I then consulted my table of the Iridia which shows the order in which they pass over in the successive planes. I was then able to make the following OBS: Ir P47 50/53 not seen Ir P48 56 mag 6 or 7 A Denebola 20010323 055 difficult to see Ir P49 52/50 located mag 5 or 6 A Denebola 20010323 10420? glint mag 5? 20010323 10545.84 lost mag 7? 20010323 10555.40 Ir P4A 53/54 located mag 6? 20010323 11218.55 up to mag 5? 20010323 11252.02 glint mag 4 or 5 20010323 11332.76 glint mag 4? 20010323 11359.50 glint mag 4 or 5 20010323 11431.30 glint mag 4? 20010323 11456.30 down to mag 5? 20010323 115 4 lost mag 7? 20010323 115 8.51 Ir P40 84 located mag 6? 20010323 12116.58 up to mag 5? 20010323 122 9.89 glint mag -4?? naked eye 20010323 12249.30 down to mag 5? 20010323 12344.03 glint mag 4? 20010323 124 7.74 down to mag 5? 20010323 124 9.80 lost mag 7? 20010323 12414.02 EOO As usual, personal equation, estimated to be .25 seconds, is not applied, UTC and CE are used, use of 7x35 binocs is not noted, and since I use UTC comprehensively, no village-idiot time is provided. As has been the case in the past when high-multiplicity glints were observed, the dips and peaks were quite shallow, demanding close attention. The asymmetries, with respect both to the predicted times and the observed instants of mag 5, should be evident. Iridial glints produce narrow North-South tracks. It would be interesting to see if two or more observers could verify the asymmetries. Also, note that the prediction for the quadruple glint would not have been generated by a search less deep than mag 5 or so. I look for mag 6, and then expand from that. I see a lot more that way. I hope you see a lot more, too, and will let us know about it. Cheers. Walter Nissen wnissen@tfn.net -81.8637, 41.3735, 256m elevation --- Take Back the Diamond-Studded Velvet: Support your local dark sky: http://www.darksky.org --- Iridium 52 4.0 1.8 0.0 6.0 d 8.4 1 25169U 98010A 01076.15698527 -.00000453 00000-0 -16898-3 0 4116 2 25169 86.3982 310.8210 0002503 82.6689 277.4796 14.34214968160961 Iridium 56 4.0 1.8 0.0 6.0 d 11 1 25170U 98010B 01073.70874618 +.00000085 +00000-0 +23327-4 0 01542 2 25170 086.3968 311.8246 0002540 078.2604 281.9039 14.34218276160591 Iridium 50 4.0 1.8 0.0 6.0 d 9.2 1 25172U 98010D 01076.77221399 -.00000021 00000-0 -14509-4 0 4071 2 25172 86.3965 310.5434 0002515 68.6575 291.4854 14.34217639161030 Iridium 53 4.0 1.8 0.0 6.0 d 9.4 1 25173U 98010E 01076.16332575 .00000075 00000-0 19870-4 0 3997 2 25173 86.3967 310.8010 0002582 78.2148 281.9327 14.34218525160957 Iridium 84 4.0 1.8 0.0 6.0 d 6.9 1 25530U 98066D 01077.14642667 .00000133 00000-0 40415-4 0 1947 2 25530 86.4017 310.3411 0001768 34.3630 325.7679 14.34218707126327 ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Sun Mar 25 2001 - 09:51:43 PST