I have used the navigation warning to produce a track map for the ascent trajectory: http://www.zarya.info/Diaries/blog/tracks.php?event=TacRL-2 My conclusion on the orbit differs slightly from Marco's and it is possible to narrow the intended launch window to a period of about 30 minutes. Robert Christy > On 9 Jun 2021, at 15:40, Marco Langbroek via Seesat-l <seesat-l_at_satobs.org> wrote: > > A Navigational Warning has appeared that looks to be for an airborne launch on > 13-14 June. > > It most likely is a Pegasus-XL launch with TacRL-2, a Responsive Launch demo by > the Space Force (the alternative is Virgin Orbit's LauncherOne launch of amongst > others Brik-II, but that is said to be scheduled for the last week of June). > > The line-up of the hazard areas indicates a ~98 degree polar (and likely > sun-synchronous) orbit. > > 090844Z JUN 21 > NAVAREA XII 257/21(18,83). > EASTERN NORTH PACIFIC. > CALIFORNIA. > 1. HAZARDOUS OPERATIONS 0739Z TO 0855Z DAILY > 13 AND 14 JUN IN AREAS BOUND BY: > A. 35-19N 123-44W, 35-13N 122-58W, > 31-11N 124-05W, 31-16N 124-30W. > B. 29-34N 125-03W, 29-28N 124-29W, > 27-32N 124-53W, 27-38N 125-26W. > C. 20-19N 127-23W, 20-02N 125-41W, > 15-26N 126-30W, 15-43N 128-11W. > D. 01-20N 131-46W, 00-35N 127-20W, > 01-52S 127-44W, 01-06S 132-11W. > 2. CANCEL THIS MSG 140955Z JUN 21. > > > The elset below is for an assumed sun-synchronous orbital altitude of ~660 km > and launch at the start of the launch window: > > TacRL-2 for launch at launch 13 Jun 2021 07:40:00 UT > 1 70000U 21999A 21164.31944444 .00000000 00000-0 00000-0 0 07 > 2 70000 098.0000 070.0141 0007104 159.5631 326.6111 14.70334902 04 > > Lot's of assumptions in this elset (including precise orbital inclination and > orbital altitude), so be prepared for large deviations. > > About TacRL-2: > https://spaceflightnow.com/2021/03/17/northrop-grummans-pegasus-rocket-selected-for-responsive-launch-demo/ > > > - Marco > > > ----- > Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. > e-mail: sattrackcam_at_langbroek.org > > launchtower: http://launchtower.langbroek.org > Station (b)log: http://sattrackcam.blogspot.com > Twitter: _at_Marco_Langbroek > ----- > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Thu Jun 10 2021 - 06:08:28 UTC
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