Jonathan McDowell ✓

@planet4589 · Somerville, MA, USA · joined 22 Jan 2009

Astronomer commenting on space launches. Orbital Police. All plots CC-BY. https://t.co/MjaOE0FEqR

172 899Followers

4 702Following

83 223Posts total

94.4KViews on collected posts

Ultimi post

Jonathan McDowell ✓@planet45898 Sep

The @AvantiComms Hylas 2 satellite relocated in 2024 from 31E to 142E, and then in early 2025 to 72.5W; it started relocating again in Jul 2026. Anyone out there know the specific reason for these relocations? Leased as BIU or something, and if so for who? 5.8K views · 66 likes · 3 reposts · 4 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

LAUNCH at 1426 UTC Sep 6 of Starlink Group 15-24 from Vandenberg 7.3K views · 67 likes · 4 reposts · 0 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

To be clear: the other possibility is that the sixth object is a debris object and the deorbit burn did happen. Will become more clear with further data (or a statement from ISAR?) 18.2K views · 194 likes · 13 reposts · 4 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

@planet4589 good to see spectrum make orbit. the missing deorbit burn bugs me though - 520x600 km sun-sync will be up there for years 749 views · 3 likes · 0 reposts · 0 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

@planet4589 Maybe they didn‘t deorbit on purpose for the experiment that was attached to the rocket… 1.2K views · 15 likes · 0 reposts · 1 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

@planet4589 There was a payload that was designed to stay on the 2. stage, yeah 962 views · 12 likes · 0 reposts · 0 replies Open on X →

Jonathan McDowell ✓@planet45896 Sep

Six objects cataloged in a 520 x 600 km x 97.4 deg, 1036 LTDN sun-sync orbit consistent with launch from Andoya, confirming success of the ISAR Spectrum launch, although suggesting that stage 2 may not have performed a deorbit burn. 38.3K views · 447 likes · 22 reposts · 6 replies Open on X →

Jonathan McDowell ✓@planet45895 Sep

Confirmation from ISAR - congrats to them. Now we wait for USSF TLEs for independent confirmation, hopefully sometime tomorrow. 22K views · 545 likes · 20 reposts · 3 replies Open on X →

Rispetto ad account della stessa dimensione

8 post degli ultimi 90 giorni, accanto alla fascia di 100K–1M follower. arriva a più persone rispetto ad account della stessa dimensione.

Visualizzazioni mediane6 546questo account6 028mediana per 100K–1M

Copertura, %3.79%questo account1.90%mediana per 100K–1M

Interazione, %1.25%questo account1.16%mediana per 100K–1M

Metrica	Questo account	Mediana per 100K–1M	Rapporto
Visualizzazioni mediane per post	6 546	6 028	1.09×
Copertura (visualizzazioni ÷ follower)	3.79%	1.90%	1.99×
Tasso di interazione	1.25%	1.16%	1.08×

Altri account di questa fascia → Confronta con un altro account → Come sono costruiti questi parametri →

Growth & engagement

How the posts we collected actually performed: views and reaction rate post by post, what the audience did with them, and where the follower count goes.

Views per post

22K5 Sep

38.3K6 Sep

962

1.2K

749

18.2K

7.3K

5.8K8 Sep

Last 8 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

Engagement rate per post

2.58%5 Sep

1.24%6 Sep

1.25%

1.37%

0.40%

1.16%

0.97%

1.26%8 Sep

Reactions — likes, reposts, replies and quotes — divided by views. Median for 100K–1M accounts is 1.16%.

What the audience does

Likes92.3%1 349 in total

Reposts4.2%62 in total

Replies1.2%18 in total

Bookmarks2.2%32 in total

Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

The follower curve appears once this account has two daily snapshots — we take one a day, and this one is on its first.

Ultimi post

Rispetto ad account della stessa dimensione

Growth & engagement

Views per post

Engagement rate per post

What the audience does

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