Per magnitude I am still not satisfied with my precision of brightness reduction of the data obtained on two previous mornings (15,17), struggling with the number of objects and accuracy since stars between mag 4 and 6 will blink out inconsistently with their values. Either a matter of where pixels fall on color sensor, bad seeing conditions (lots of twinkling) maybe even star spectrum differences. Estimates of usual magnitude 5 with decent conditions seem safe, with optimum illumination getting some mag. 4 or brighter. No momentary flares seen so far. Brightening events are extended. Less than ideal conditions show faint passes dimmer to mag. 8... If this is helpful to anyone tracking the Starlink objects, here is my data from the 17th from capturing 43 objects solved manually after eliminating some false positives that were other satellites/r-b's. The identifiers () were ones I missed because they were out of FOV as I was tracking another. I quickly noted some that were especially bright. Note two brights have not completed final orbit altitude. I note altitudes at the time for those not in final position that were observed. I am having difficulty determining the difference between mag.4-6 in my videos as the transparency wasn't great,etc. As the passes went on they moved closer to horizon so objects got fainter mag. 6-8 plus thin clouds. Special note AA(44259) was no where to be seen on multiple nights. Noticing it's history the elements had it co-located with other objects (esp. T-44252), but on multiple nights no more than one object could be differentiated. Also the elements of AA weren't updated in a few days.. Apologies to the community for breaking convention of data layout NORAD chron ID time late 44287 1 BE 0:06 44237 2 C 0:07 (J) 44254 3 V 0:01 44258 4 Z 0:02 44282 5 AZ 0:03 496 x 499 km; 53:0° 44261 6 AC 0:03 44250 7 R 0:02 44249 8 Q 0:01 >mag 4 534 x 536 km; 53:0° 44264 9 AF 0:02 44272 10 AP 0:03 44244 11 K 0:01 44263 12 AE 0:02 >mag 4 44247 13 N 0:03 44285 14 BC 0:01 44283 15 BA 0:03 44284 16 BB 0:02 44280 17 AX 0:03 (AT) 44255 18 W 0:02 44277 19 AU 0:01 44257 20 Y 0:01 483 x 484 km; 53:0° 44267 21 AJ 0:01 44281 21 AY 0:01 44286 23 BD 0:04 >mag 4 540 x 544 km; 53:0° 44279 24 AW 0:04 (AV) 44275 25 AS 0 44274 26 AR 0:02 (AQ) 44265 27 AG 0:03 44270 28 AM 0:05 44271 29 AN 0:01 44269 31 AL 0:01 44294 31 BM 0:01 44236 32 B 0:01 44242 33 H 0:02 44266 34 AH 0 44251 35 S 0:01 547 x 553 km; 53:0° 44238 36 D 0:01 44268 37 AK 0 44248 38 P 0:01 early 44292 39 BK 0:01 early 44291 40 BJ 0 44239 41 E 0 (AA) not seen, old elements 44252 42 T 0:01 early 44288 43 BF 0:02 early () denotes missed pass times mm:ss denotes late compared with elements published that morning unless noted early.... _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Mon Jul 22 2019 - 02:19:49 UTC
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