Launch week: August 31-September 6, 2026

Six launch records currently fall inside the August 31-September 6, 2026 UTC calendar: one Rocket Lab mission, one Galactic Energy test flight, one ISRO mission, one Isar Aerospace test flight, and two SpaceX Starlink missions. The main planning problems are a provisional Pallas-1 assignment, a current-status conflict for Isar's mission, and a September 5/6 date conflict for Starlink Group 15-24. 1 2

All times below are UTC. NET means no earlier than; TBD means the source has not settled or disclosed the field. A time shown as a window opening is labelled as such, so readers can separate the first possible liftoff from a source's target time.

Quick schedule

UTC date and time	Mission / vehicle	Launch organisation	Site and pad	Payload and destination	Status and webcast
Sep 1, 02:00 Window 01:52-04:09	Pallas-1 Demo Flight Pallas 1	Galactic Energy	Jiuquan Satellite Launch Center, Pallas-1 Launch Pad	Maiden test flight; payload and customer undisclosed; destination orbit TBD.	Provisional. The mission detail says assigning Pallas-1 to this slot is uncertain. Stream unlisted. 3
Sep 1, 11:30 NET	Owl Around The World Electron/Curie	Rocket Lab	Launch Complex 1, Māhia Peninsula, New Zealand; pad TBD	One Synspective StriX Earth-observation satellite to 575 km low Earth orbit.	NET. Rocket Lab live stream is the mission's webcast destination; the mission page gives no more precise date than NET September 1. 4
Sep 2, 07:46 Window 07:46-11:46	Starlink Group 15-23 Falcon 9 Block 5	SpaceX	Vandenberg Space Force Base, SLC-4E	27 Starlink V2 Mini satellites to low Earth orbit; booster B1063 targets the Of Course I Still Love You droneship.	Scheduled; delayed from Sep 1. SpaceX mission page and webcast. The listed 07:46 time is the window opening in Spaceflight Now and the liftoff target in Next Spaceflight. 2 5
Sep 3, 21:25 Window 21:00-01:00	EOS-05 (GISAT-1A) GSLV Mk II	ISRO	Satish Dhawan Space Centre, Second Launch Pad	One ISRO geostationary imaging satellite to geostationary transfer orbit; listed mass 2,367 kg.	Provisional listing. The current ISRO launch-missions table contains no future entry for this flight. Stream unlisted. 6 7
Sep 4, 20:00 Window 20:00-21:00	Onward and Upward Spectrum	Isar Aerospace	Andøya Rocket Range, Nordland, Norway, Orbital Launch Pad	Five CubeSats and one non-separable experiment under ESA's Boost! programme, to sun-synchronous orbit.	Date disputed; recheck before setting an alarm. Next Spaceflight lists Sep 4, while Isar's current mission page reports a stand-down and gives no replacement date. The detail lists NASASpaceflight.com as the watch destination; no official Isar stream page was returned. 8 9
Sep 6, 10:59 Window 10:59-14:59	Starlink Group 15-24 Falcon 9 Block 5	SpaceX	Vandenberg Space Force Base, SLC-4E	27 Starlink V2 Mini satellites to low Earth orbit; booster B1088 targets the Of Course I Still Love You droneship.	Schedule conflict. Next Spaceflight and SpaceX list Sep 6; Spaceflight Now lists Sep 5, with a 11:13 UTC window opening, delayed from Sep 4. SpaceX mission page and webcast. 2 10

Mission cards

Pallas-1 Demo Flight: Tuesday's uncertain debut

Galactic Energy's Pallas-1 has a listed liftoff target of 02:00 UTC on September 1, with a 01:52-04:09 UTC window from the Pallas-1 Launch Pad at Jiuquan. The mission is the rocket's first test flight. The detail page says that assigning Pallas-1 to this launch slot remains uncertain, so the time belongs on a calendar as a provisional alert. 3

The mission record names no payload, customer, or destination orbit. The launch is therefore useful for tracking a new vehicle's debut, while its mission purpose beyond the flight test remains TBD. The detail page lists no webcast.

Owl Around The World: Rocket Lab's NET mission

Rocket Lab's official mission page gives NET September 1 at 11:30 UTC for Owl Around The World. Electron will carry one StriX satellite for Synspective from Launch Complex 1 at the Māhia Peninsula. The satellite is intended for a 575 km low Earth orbit and will join Synspective's synthetic-aperture-radar imaging constellation. 4

Rocket Lab says the live stream starts about 30 minutes before launch and directs viewers to its live-stream page. The date remains NET, so the page is the correct place to recheck the launch window before watching.

Starlink Group 15-23: Wednesday from Vandenberg

Next Spaceflight lists 07:46 UTC on September 2 from SLC-4E, with a four-hour window through 11:46 UTC. Spaceflight Now gives the same 07:46 UTC opening and records a delay from September 1. SpaceX's mission page gives the corresponding 15:46-19:46 China Standard Time range, which converts to 07:46-11:46 UTC. 2 5 11

The payload is 27 Starlink V2 Mini satellites for low Earth orbit. SpaceX identifies B1063 as the first-stage booster and says the stage will land on Of Course I Still Love You in the Pacific Ocean. The webcast begins about 10 minutes before liftoff on the mission page. 11

EOS-05 (GISAT-1A): an ISRO date that needs confirmation

The current Next Spaceflight detail lists 21:25 UTC on September 3, with a window opening at 21:00 UTC and closing at 01:00 UTC on September 4. GSLV Mk II is assigned to the Second Launch Pad at Satish Dhawan Space Centre. The mission record describes EOS-05/GISAT-1A as an ISRO geostationary imaging satellite bound for geostationary transfer orbit. 6

The official ISRO launch-missions table retrieved for this issue ends with the January 2026 PSLV-C62 entry and carries no EOS-05 date. The September 3 record therefore stays provisional until ISRO publishes a matching mission notice. The current detail page lists the webcast as unavailable. 7

Onward and Upward: an Isar date in conflict with the operator page

Next Spaceflight lists Isar Aerospace's second Spectrum flight for 20:00 UTC on September 4, with a one-hour window from Andøya's Orbital Launch Pad. The payload is five CubeSats and the non-separable Let It Go experiment, supported by ESA's Boost! programme, for sun-synchronous orbit. 8

Isar's mission-updates page currently says the company is standing down from a launch attempt while teams analyse off-nominal fluid-system behaviour. The page contains older NET dates, including June 15, and gives no current replacement date after the stand-down. The September 4 date is therefore a tracker listing rather than a confirmed operator date. The Next Spaceflight record names NASASpaceflight.com as the watch destination, while the retrieved Isar page supplies no official webcast URL. 9 12

Starlink Group 15-24: Sunday on one source, Saturday on another

Next Spaceflight lists 10:59 UTC on September 6 from SLC-4E, with a window through 14:59 UTC. SpaceX's mission page gives September 6, 18:59-22:59 China Standard Time, which converts to the same 10:59-14:59 UTC window. 10 13

Spaceflight Now instead lists September 5 and a window opening at 11:13 UTC, marked as delayed from September 4. Both records describe 27 Starlink V2 Mini satellites and booster B1088 landing on Of Course I Still Love You. Keep both dates visible until SpaceX or the range posts a single current schedule. The SpaceX mission page is the direct webcast destination and says the live feed begins about 10 minutes before liftoff. 2 13

Watch priorities

Set a provisional early-morning alert for September 1, 02:00 UTC for Pallas-1. The launch window is dated, but the mission detail warns that the assignment remains uncertain and gives no stream.
Keep September 1, 11:30 UTC open for Rocket Lab. The official mission page supplies the NET time, payload, orbit and a concrete live-stream page.
Use the SpaceX pages for the September 2 and September 5/6 entries. Starlink 15-23 has a consistent September 2 window across the retrieved sources. Starlink 15-24 needs a schedule check because the retrieved sources disagree by one day and 14 minutes at window opening. 2 11 13
Recheck EOS-05 and Onward and Upward before watching. Both have tracker dates inside the week, while their operator-facing pages leave the current date unresolved. 6 7 8 9

Coverage notes

The six entries above come from dated mission details or an operator mission page inside the August 31-September 6 UTC window. Month-only records remain outside the count because a month does not establish a Monday-Sunday placement. 1

Rocket Lab's official page places Owl Around The World on NET September 1 at 11:30 UTC, so the mission is included even though its date remains subject to change. 4

NASA's current events material places the Nancy Grace Roman Space Telescope on August 30, before this issue's window. The NASA entry is therefore outside this week's count. 14 15

The retrieved ESA launch page adds no dated ESA launch inside this week's window. The current Blue Origin Missions page also shows completed missions through New Glenn's April 19 flight and no dated mission for this week; an independent Blue Origin schedule likewise lists its next displayed missions outside the window. 16 17 18

The current ISRO table contains no EOS-05 entry, and Isar's current mission page gives no replacement date after its stand-down. Those two records remain in the schedule because dated tracker details place them inside the week, with the source limitation visible in their cards. 6 7 8 9

Launch times, windows and webcasts can change after publication. Recheck the operator page before setting an alarm, especially for Pallas-1, EOS-05, Onward and Upward, and Starlink Group 15-24.