Week in Space Data, every Friday.
Slip Watch · weekly
1 launch date slipped a day or more this week, 9.3 days in total. 1 lost a firm date. Placeholder date rolls (8) are recorded and not counted. 28 changes our sync saw late are listed separately and not counted.
Frozen edition. Published September 28, 2026; these figures will not change. Corrections, if any, are logged on /corrections.
Correction, September 29, 2026
What was wrong: The edition counted 28 date changes that our sync only caught up with during this week as if they had happened in it. Our sync had not been refreshing those launches when their dates changed (until 2026-09-24 it refreshed only the next 100 upcoming launches), so it recorded each backlog change on the day it next saw the launch, and the day each change was made is not known from our records. Launch Library 2's own records date 25 of them before this week, 19 of those before our recording began on 2026-08-29. As frozen, the edition read: 48 date changes: 1 slip (9.3 days), 0 pulled in, 6 same-day changes, 6 firmed, 3 lost a firm date, 32 placeholder rolls.
What it says now: Counting only changes our sync saw when they happened (method 1.1): 20 date changes: 1 slip (9.3 days), 0 pulled in, 6 same-day changes, 4 firmed, 1 lost a firm date, 8 placeholder rolls. The slip and pull-in figures are unchanged. The 28 caught-up changes are listed on the edition page, labelled, and not counted.
The edition as frozen is kept as it was; the figures below apply the correction. Logged on /corrections.
| Mission | Provider | From, to | Kind |
|---|
Method v1.0: how moves are classified and launches scored. Data: Launch Library 2 (The Space Devs, a volunteer nonprofit; support them on Patreon) manifest, observed and recorded by SpaceNexus since August 29, 2026. Licence CC BY 4.0: cite “SpaceNexus Launch Ledger”. No sponsor sees or shapes this ledger (policy).
| Move |
|---|
| Observed |
|---|
| Falcon 9 Block 5 | Starlink Group 15-25 | SpaceX | Sep 30, 2026 to Oct 10, 2026 | Slip | +9.3 d | Sep 21 |
|---|
| Provider | Slips | Launches slipped | Days lost | Median slip | Pulled in | Same-day | Firmed | Lost a date | Placeholder rolls |
|---|---|---|---|---|---|---|---|---|---|
| SpaceX | 1 | 1 | 9.3 | 9.3 d | 0 | 3 | 3 | 0 | 1 |
| Arianespace | 0 | 0 | 0 | n/a | 0 | 0 | 0 | 1 | 0 |
| China Aerospace Science and Technology Corporation | 0 | 0 | 0 | n/a | 0 | 1 | 0 | 0 | 0 |
| Indian Space Research Organization | 0 | 0 | 0 | n/a | 0 | 0 | 1 | 0 | 7 |
| Rocket Lab | 0 | 0 | 0 | n/a | 0 | 2 | 0 | 0 | 0 |
| Provider | Flew | Scored | Within 1 day | Within 7 days | Average delay | Median delay |
|---|---|---|---|---|---|---|
| All providers | 4 | 4 | 75% | 75% | +2.8 d | 0 d |
| China Aerospace Science and Technology Corporation | 2 | 2 | too few (2) | too few (2) | +6 d | +6 d |
| Rocket Lab | 1 | 1 | too few (1) | too few (1) | 0 d | 0 d |
| SpaceX | 1 | 1 | too few (1) | too few (1) | -0.9 d | -0.9 d |
Shares are shown once a group has 3 or more scored launches. Delay is liftoff minus the first firm date on record; negative means it flew early.
No launch was pulled in by a day or more.
| Mission | Provider | From, to | Kind | Move | Observed |
|---|---|---|---|---|---|
| Ariane 64 Block 2 | Amazon Leo (LE-04) | Arianespace | Oct 7, 2026 to Oct 2026 | Lost its date | not a slip | Sep 25 |
Launch Library parks an undated launch at the end of a period (“NET 2026” is stored as Dec 31, 2026). When that placeholder moves, nothing was announced and nothing slipped, so these rows are listed for completeness and never counted.
| Mission | Provider | From, to | Kind | Move | Observed |
|---|---|---|---|---|---|
| PSLV-XL | EOS-10 (Oceansat-3A) | Indian Space Research Organization | Mar 2027 to Jan 2027 | Placeholder roll | not a slip | Sep 26 |
| PSLV | RISAT-2A | Indian Space Research Organization | Dec 31, 2026 (placeholder) to 2027 | Placeholder roll | not a slip | Sep 26 |
| PSLV | ConnectedCosmos | Indian Space Research Organization | Dec 31, 2026 (placeholder) to 2027 | Placeholder roll | not a slip | Sep 26 |
| GSLV Mk II | IDRSS-2 | Indian Space Research Organization | Dec 31, 2026 (placeholder) to 2027 | Placeholder roll | not a slip | Sep 26 |
| GSLV Mk II | IDRSS-1 | Indian Space Research Organization | Dec 31, 2026 (placeholder) to 2027 | Placeholder roll | not a slip | Sep 26 |
| PSLV-XL | TDS-01 | Indian Space Research Organization | Dec 31, 2026 (placeholder) to Nov 2026 | Placeholder roll | not a slip | Sep 26 |
| LVM-3 | Gaganyaan-1 | Indian Space Research Organization | Dec 31, 2026 (placeholder) to Nov 2026 | Placeholder roll | not a slip | Sep 26 |
| Falcon 9 Block 5 | Crew-14 | SpaceX | Dec 31, 2027 (placeholder) to Mar 2027 | Placeholder roll | not a slip | Sep 25 |
| Falcon 9 Block 5 | SDA Tranche 1 Transport Layer A | SpaceX | Oct 31, 2026 (placeholder) to Oct 5, 2026 | Firmed | not a slip | Sep 25 |
| Falcon Heavy | NROL-97 | SpaceX | Oct 31, 2026 (placeholder) to Oct 2, 2026 | Firmed | not a slip | Sep 24 |
| GSLV Mk II | IRNSS-1L (NVS-03) | Indian Space Research Organization | Dec 31, 2026 (placeholder) to Oct 15, 2026 | Firmed | not a slip | Sep 22 |
| Falcon 9 Block 5 | Transporter 18 (Dedicated SSO Rideshare) | SpaceX | Oct 31, 2026 (placeholder) to Oct 1, 2026 | Firmed | not a slip | Sep 21 |
These date changes were recorded in this period but did not happen in it: the launch was outside the part of the manifest our sync was refreshing when its date changed, so we only saw the change later. They are listed so nothing is hidden, and are in none of the figures above.
| Mission | Provider | From, to | Kind | Move | Observed |
|---|---|---|---|---|---|
| SSLV | Space MAITRI | Indian Space Research Organization | Dec 31, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Soyuz 2.1a/Fregat-M | MKA Kinosputnik, KOEN and others | Russian Federal Space Agency (ROSCOSMOS) | Nov 19, 2026 to 2027 | Lost its dateCaught up: seen late | not counted | Sep 24 |
| Neutron | Maiden Flight | Rocket Lab | Dec 31, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Long March 5 | Chang'e 7 | China Aerospace Science and Technology Corporation | Sep 30, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Firefly Alpha Block 2 | INCUS | Firefly Aerospace | Oct 31, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Falcon 9 Block 5 | Blue Ghost Lunar Lander Mission 2 | SpaceX | Dec 31, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Atlas V N22 | Starliner-2 | United Launch Alliance | Dec 31, 2026 (placeholder) to 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Falcon 9 Block 5 | KOMPSAT-7A | SpaceX | Nov 30, 2026 (placeholder) to Jun 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Vega-C | KOMPSAT-6 & PLATiNO 1 | Avio S.p.A | Nov 30, 2026 (placeholder) to Apr 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| New Glenn | Blue Moon Pathfinder | Blue Origin | Sep 30, 2026 (placeholder) to Q1 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Falcon 9 Block 5 | Nova-C IM-3 | SpaceX | Dec 31, 2026 (placeholder) to Q1 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Falcon 9 Block 5 | 5x Astranis MicroGEO | SpaceX | Dec 31, 2026 (placeholder) to Q1 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Eris-1 | Flight Two | Gilmour Space Technologies | Dec 31, 2026 (placeholder) to Q1 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| PSLV-XL | EOS-10 (Oceansat-3A) | Indian Space Research Organization | Mar 31, 2026 (placeholder) to Mar 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Firefly Alpha Block 2 | QuickSounder | Firefly Aerospace | Dec 31, 2026 (placeholder) to Feb 15, 2027 | FirmedCaught up: seen late | not counted | Sep 24 |
| Astra Rocket 4 | Maiden Flight | Astra Space | Dec 31, 2026 (placeholder) to Q1 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Falcon 9 Block 5 | SDA Tranche 2 Transport Layer C | SpaceX | Oct 31, 2026 (placeholder) to Jan 2027 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Electron | Aspera | Rocket Lab | Dec 31, 2026 (placeholder) to Jan 29, 2027 | FirmedCaught up: seen late | not counted | Sep 24 |
| Vulcan | USSF-57 | United Launch Alliance | May 31, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Vulcan | SDA Tranche 2 Transport Layer B | United Launch Alliance | Sep 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Vulcan | SDA Tranche 1 Tracking Layer D | United Launch Alliance | Jun 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Vulcan | SDA Tranche 1 Tracking Layer B | United Launch Alliance | Jun 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Vulcan | NROL-64 | United Launch Alliance | Jun 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| Themis Demonstrator | T1H-1 | European Space Agency | Sep 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| RFA One | Maiden Flight | Rocket Factory Augsburg | Aug 31, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| PSLV-XL | TDS-01 | Indian Space Research Organization | Mar 31, 2026 (placeholder) to Dec 31, 2026 (placeholder) | Placeholder rollCaught up: seen late | not counted | Sep 24 |
| New Glenn | Amazon Leo (LN-01) | Blue Origin | Jun 4, 2026 to 2026 | Lost its dateCaught up: seen late | not counted | Sep 24 |
| Nebula-1 | Demo Flight | Deep Blue Aerospace | Jun 30, 2026 (placeholder) to 2026 | Placeholder rollCaught up: seen late | not counted | Sep 21 |