Three satellites were deployed from the launch that was originally announced as Cosmos 2519: Cosmos 2519 itself (catnum 42798), Cosmos 2521 (catnum 42919) and Cosmos 2523 (catnum 42986). I have been following these satellites in detail since launch using the Two-Line Orbital Elements. I have just had one article about them published in the British Interplanetary Society's Spaceflight dated June 2018 (a second article is well underway) plus I have been posting data to the NASASpaceFlight.com forum thread about Cosmos 2519. My eyesight is lousy and on a clear dark night if it were possible, I might just be able to make out Venus at -4.4 magnitude. So my chances of seeing these satellites is the best approximation to zero that you will come across. I am wondering whether anyone has done any visual observations of these satellites which could give an idea of their visual magnitudes, whether they are steady in their brightness or whether the brightness varies (either due to tumbling or simply the different attitude of the satellite relative to the observer), etc. I would appreciate any information please. If I wish to use anything with my writing then I will check with the source first and naturally full credit will be given. If you wish, you can contact me directly rather than take up bandwidth on this mailing list: phillipclark_at_btinternet.com. Many thanks in advance for any information which anyone is willing to share. Phillip Clark _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri May 04 2018 - 10:01:34 UTC
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