ISAR Spectrum FLIGHT 2 edit: "the launch window DOES ALLOW FOR A 'Twilight Effect' as the upper stage travels over the North Pole" On Mon, Mar 16, 2026 at 2:37 PM Dillon Shropshire < dillon.shropshire2006_at_gmail.com> wrote: > As we close in on the second test flight of ISAR's Spectrum rocket, I have > released preliminary Predictive TLEs derived from completed Marine and Air > Hazard Notices. > > Available here and on my website: https://dillonsspacepage.com/pretle > (Check website for updated RAAN values as launch time changes occur) > > > NET: Mar 19 2026 20:00:00 UTC > Onward and Upward PO 192000.00 > 1 70044U 26057A 26078.83935185 .00000000 00000-0 00000-0 0 9990 > 2 70044 97.3943 154.0733 0254696 083.2149 000.0000 15.62204037 04 > Onward and Upward 192000.00 > 1 70044U 26057A 26078.87128472 .00000000 00000-0 00000-0 0 9997 > 2 70044 97.3943 154.0407 0004731 083.2244 179.6270 15.05080073 02 > > Estimating a ~548 x 555km x 97.39 deg orbit (exact eccentricity unknown) > > The launch window does inhibit a 'Twilight Effect' as the upper stage > travels over the North Pole... for > observers in UK/Northern EU I would be watching around 1hr 37mins into > flight for the upper stage to exit Earth's shadow. This MAY be accompanied > by fuel venting post de-orbit burn. > > Hazard Map Snapshots > https://ibb.co/FLrmrHGs > https://ibb.co/4RnNRDQ2 > https://ibb.co/B2z0F2Kt > _______________________________________________ Seesat-l mailing list https://lists.seesatmail.org/mailman/listinfo/seesat-lReceived on Mon Mar 16 2026 - 11:56:08 UTC
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