Themis Demonstrator | T1H-1 — visibility, launch time & where to look
First low-altitude hop test of a Themis demonstrator, with a targeted altitude up to 100 m.
Launch time
- Sep 30, 2026, 12:00 AM UTC
- Sep 29, 2026, 8:00 PM Eastern
- Sep 29, 2026, 5:00 PM Pacific
This launch time is not yet confirmed. Rocket launches often slip by hours or days for weather, technical checks, or range scheduling — treat the time above as a target and re-check close to the date.
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Sky outlook at the pad
Daily cloud cover and rain chance at Esrange Space Center — liftoff is still beyond the 7-day forecast window:
- Today
- Tue
- Wed
- Thu
- Fri
- Sat
- Sun
Forecast at the launch site; check your own sky too — cloud over you can hide a launch the pad forecast says is clear.
Pro members get the 7-day outlook for their own saved locations + a weather go/no-go call. Pro — $19.99/yr
💥 Sonic boom expected
The booster returns to land at Launch Complex 3 Landing Pad — expect a sharp double sonic boom around the landing area a few minutes after liftoff.
The booster comes back to land around T+8 min; the boom then travels outward at the speed of sound — roughly a minute per 13 miles.
Not an explosion — it’s the sharp double crack of a returning booster going supersonic. Booster-landing sonic booms, explained →
Pro members get boom alerts for their saved spots → Pro — $19.99/yr
Which cities can see this launch?
Estimated visibility from major towns near US launch sites, assuming clear skies and an open horizon. The 10 most likely first:
| City | Visibility | Look toward | Distance to pad |
|---|---|---|---|
| Philadelphia, PA | Not visible | — | 3851 mi |
| Ocean City, NJ | Not visible | — | 3878 mi |
| Cape May, NJ | Not visible | — | 3907 mi |
| Dover, DE | Not visible | — | 3908 mi |
| Rehoboth Beach, DE | Not visible | — | 3925 mi |
| Baltimore, MD | Not visible | — | 3926 mi |
| Annapolis, MD | Not visible | — | 3943 mi |
| Ocean City, MD | Not visible | — | 3948 mi |
| Berlin, MD | Not visible | — | 3953 mi |
| Salisbury, MD | Not visible | — | 3960 mi |
Show all 94 cities
| City | Visibility | Look toward | Distance to pad |
|---|---|---|---|
| Washington, DC | Not visible | — | 3960 mi |
| Pocomoke City, MD | Not visible | — | 3977 mi |
| Chincoteague, VA | Not visible | — | 3981 mi |
| Wallops Island, VA | Not visible | — | 3986 mi |
| Onancock, VA | Not visible | — | 4004 mi |
| Exmore, VA | Not visible | — | 4016 mi |
| Cape Charles, VA | Not visible | — | 4037 mi |
| Richmond, VA | Not visible | — | 4055 mi |
| Newport News, VA | Not visible | — | 4059 mi |
| Virginia Beach, VA | Not visible | — | 4062 mi |
| Norfolk, VA | Not visible | — | 4070 mi |
| Myrtle Beach, SC | Not visible | — | 4330 mi |
| Charleston, SC | Not visible | — | 4412 mi |
| Hilton Head Island, SC | Not visible | — | 4467 mi |
| Savannah, GA | Not visible | — | 4484 mi |
| Brunswick, GA | Not visible | — | 4552 mi |
| Jacksonville, FL | Not visible | — | 4608 mi |
| Valdosta, GA | Not visible | — | 4615 mi |
| St. Augustine, FL | Not visible | — | 4627 mi |
| Palm Coast, FL | Not visible | — | 4645 mi |
| Tallahassee, FL | Not visible | — | 4663 mi |
| Daytona Beach, FL | Not visible | — | 4664 mi |
| Gainesville, FL | Not visible | — | 4667 mi |
| New Smyrna Beach, FL | Not visible | — | 4673 mi |
| Mims, FL | Not visible | — | 4694 mi |
| Sanford, FL | Not visible | — | 4696 mi |
| Titusville, FL | Not visible | — | 4697 mi |
| Port Canaveral, FL | Not visible | — | 4705 mi |
| Merritt Island, FL | Not visible | — | 4710 mi |
| Cocoa Beach, FL | Not visible | — | 4710 mi |
| Rockledge, FL | Not visible | — | 4712 mi |
| Orlando, FL | Not visible | — | 4715 mi |
| Satellite Beach, FL | Not visible | — | 4719 mi |
| Indialantic, FL | Not visible | — | 4724 mi |
| Melbourne, FL | Not visible | — | 4726 mi |
| Palm Bay, FL | Not visible | — | 4728 mi |
| Kissimmee, FL | Not visible | — | 4731 mi |
| Pensacola Beach, FL | Not visible | — | 4736 mi |
| Sebastian, FL | Not visible | — | 4739 mi |
| Vero Beach, FL | Not visible | — | 4748 mi |
| Gulf Shores, AL | Not visible | — | 4754 mi |
| Fort Pierce, FL | Not visible | — | 4759 mi |
| Lakeland, FL | Not visible | — | 4760 mi |
| Port St. Lucie, FL | Not visible | — | 4771 mi |
| Tampa, FL | Not visible | — | 4778 mi |
| West Palm Beach, FL | Not visible | — | 4799 mi |
| Fort Lauderdale, FL | Not visible | — | 4839 mi |
| Miami, FL | Not visible | — | 4863 mi |
| Grand Isle, LA | Not visible | — | 4871 mi |
| San Jose, CA | Not visible | — | 4918 mi |
| Fresno, CA | Not visible | — | 4930 mi |
| Bakersfield, CA | Not visible | — | 5011 mi |
| Mojave, CA | Not visible | — | 5020 mi |
| San Luis Obispo, CA | Not visible | — | 5040 mi |
| Pismo Beach, CA | Not visible | — | 5049 mi |
| Santa Maria, CA | Not visible | — | 5059 mi |
| Guadalupe, CA | Not visible | — | 5059 mi |
| Orcutt, CA | Not visible | — | 5065 mi |
| Los Alamos, CA | Not visible | — | 5070 mi |
| Vandenberg Village, CA | Not visible | — | 5075 mi |
| Solvang, CA | Not visible | — | 5078 mi |
| Buellton, CA | Not visible | — | 5078 mi |
| Pasadena, CA | Not visible | — | 5080 mi |
| Lompoc, CA | Not visible | — | 5080 mi |
| Santa Barbara, CA | Not visible | — | 5084 mi |
| Los Angeles, CA | Not visible | — | 5088 mi |
| Ventura, CA | Not visible | — | 5088 mi |
| Thousand Oaks, CA | Not visible | — | 5088 mi |
| Oxnard, CA | Not visible | — | 5091 mi |
| Malibu, CA | Not visible | — | 5095 mi |
| Rockport, TX | Not visible | — | 5103 mi |
| Long Beach, CA | Not visible | — | 5106 mi |
| Port Aransas, TX | Not visible | — | 5116 mi |
| Corpus Christi, TX | Not visible | — | 5125 mi |
| San Diego, CA | Not visible | — | 5160 mi |
| Laredo, TX | Not visible | — | 5187 mi |
| South Padre Island, TX | Not visible | — | 5230 mi |
| Laguna Vista, TX | Not visible | — | 5233 mi |
| Port Isabel, TX | Not visible | — | 5233 mi |
| Bayview, TX | Not visible | — | 5233 mi |
| Harlingen, TX | Not visible | — | 5236 mi |
| Los Fresnos, TX | Not visible | — | 5239 mi |
| McAllen, TX | Not visible | — | 5246 mi |
| Brownsville, TX | Not visible | — | 5250 mi |
Where to look
A rocket lifts off below the horizon for distant viewers, then climbs into view as it gains altitude and flies downrange. Closer to the pad you'll see it within seconds; a few hundred miles away it can take three to six minutes to rise over the horizon. Find an open view in the direction shown for your city and start watching at liftoff.
More from European Space Agency ↗
Before you go
- Launch times change — scrubs and delays are common. Re-check the day of.
- Clear skies matter. Low cloud near the pad or along the trajectory can hide the rocket.
- Twilight launches are the most dramatic; daytime launches are the hardest to see at distance.
- Trajectory and timing here are estimates from a representative ascent profile.
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Explore more
Launch data from TheSpaceDevs Launch Library 2. Page generated July 13, 2026.