Jonathan McDowell
@planet4589.bsky.social
📤 19248
📥 1982
📝 3180
Astrophysicist
LAUNCH at 2113 UTC Nov 6 of Starlink 11-14 from Vandenberg
about 13 hours ago
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reposted by
Jonathan McDowell
Richard Easther
about 19 hours ago
My take on the
@methanesat.bsky.social
shambles on
@newsroom.co.nz
-- paywalled for 24 hours....
newsroom.co.nz/2025/11/07/h...
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Speed over safety – how MethaneSAT was lost in space
Analysis: Future 'national missions' cannot be designed by administrators and politicians without meaningful input from the science community. If we learn that, it may have been worth the $30 million,...
https://newsroom.co.nz/2025/11/07/how-kiwi-methanesat-was-lost-in-space/
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LAUNCH at 0131 UTC Nov 6 of Starlink 6-81 from Canaveral
1 day ago
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LAUNCH at 1951 UTC Nov 5 of a Rocket Lab Electron from Mahia with the QPS SAR 14 radar sat for Japan's iQPS
2 days ago
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At 0935 UTC Nov 5 the US Air Force carried out test launch GT254 of a Minuteman 3 ICBM from Vandenberg Space Force Base (likely silo LF09 or LF10) to Kwajalein Atoll in the Pacific.
2 days ago
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reposted by
Jonathan McDowell
John Scalzi
3 days ago
NYT just called it for Mamdani
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reposted by
Jonathan McDowell
BeijingPalmer
3 days ago
this is the most successful a CIA officer has been at toppling a government in years.
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GCAT updates will be postponed for a few days while I have fun breaking - er I mean upgrading - the underlying software
3 days ago
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Launch at 2102 UTC Nov 4 of an Ariane 6 from Kourou with the EU's Sentinel-1D radar satellite
3 days ago
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Yaogan 46 cataloged in a 2548 x 7562 km x 20.0 deg orbit, suggesting it is related to Yaogan 45 and is not a geostationary mission as some had suggested
3 days ago
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CMS-03/GSAT-7R and the LVM3 stage 2 rocket cataloged in a 179 x 26647 km x 21.3 deg transfer orbit.
4 days ago
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I'm still trying to identify the reentry seen over Aruba at 0112 UTC Oct 31 - I suspect it was 65564 / 2025-202B CZ-7A Y14 stage 3, which did reenter that day and whose orbit seems to roughly match. Can someone with better reentry prediction tools check me?
4 days ago
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LAUNCH at 0347 Nov 3 of a CZ-7A from Wenchang with the Yaogan 46 remote sensing satellite. Orbit not yet known.
4 days ago
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I'm a bit puzzled that there are only 27 gaps in the US sat catalog (66178 to 66204) for the 28 objects from the Starlink Group 10-21 launch (2025-243). We're getting SpaceX ephem data for all 28 so I'm not sure what the 18thSDS are doing here. If anyone knows the answer let me know!
5 days ago
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LAUNCH at 1156 UTC Nov 2 of India's LVM-3 from Sriharikota carrying the CMS-03 military comms sat for ISRO and the Indian Navy to a subsync geotransfer orbit.
5 days ago
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LAUNCH at 0510 UTC Nov 2 of a Falcon 9 from Canaveral pad 40 with the Bandwagon-4 rideshare mission, including as primary payload the fourth Korean Project 425 military radar sat
5 days ago
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reposted by
Jonathan McDowell
Heidi B. Hammel
7 days ago
I recommend this article by
@meghanbartels.bsky.social
and
@leebillings.bsky.social
for folks who are looking for *factual* information about why 3I/ATLAS is of interest to planetary astronomers:
www.scientificamerican.com/article/the-...
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The Race to Study an Interstellar Comet from Deep Space
Astronomers are hustling to use interplanetary spacecraft to study the interstellar comet dubbed 3I/ATLAS while the sun is hiding it from Earth
https://www.scientificamerican.com/article/the-interplanetary-race-to-study-interstellar-comet-3i-atlas
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The Chinese station made another orbit reboost on Oct 29, a couple of days before the Shenzhou-21 launch
6 days ago
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Casey Handmer's rant on NASA's Orion capsule is worth a read.
caseyhandmer.wordpress.com/2025/10/31/n...
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NASA’s Orion Space Capsule Is Flaming Garbage
For many years, readers have asked me a simple question: “Casey, why do you hate the SLS so much? Don’t you also hate Orion?” Yes, yes I do. But life is finite and my heart is mostly filled with lo…
https://caseyhandmer.wordpress.com/2025/10/31/nasas-orion-space-capsule-is-flaming-garbage/
7 days ago
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reposted by
Jonathan McDowell
Kat Lee
7 days ago
Are you a grad student interested in writing for Astrobites, or do you know one? We're recruiting! Apply by November 26 :)
astrobites.org/2025/10/31/a...
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Apply to Write for Astrobites 2025!
Love astronomy, astrophysics, and science communication? Come join the Astrobites team! Applications due November 26th.
https://astrobites.org/2025/10/31/apply-to-write-for-astrobites-2025/
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LAUNCH of Starlink Group 11-23 at 2041 UTC Oct 31 from Vandenberg Space Force Base
7 days ago
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Shenzhou-21 docked with the TIanhe forward docking port at 1922 UTC Oct 31
7 days ago
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reposted by
Jonathan McDowell
Cosmic Penguin
7 days ago
Exact T-0 was 15:44:46.441 UTC:
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LAUNCH at 1544 UTC of Shenzhou 21 on a Chang Zheng 2F from Jiuquan carrying three astronauts to the Chinese Space Station.
7 days ago
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reposted by
Jonathan McDowell
Heidi B. Hammel
7 days ago
3I/ATLAS is behaving just as a comet should. No shenanigans. Looking forward to the possibility of JUICE (a European spacecraft heading eventually to Jupiter) observing this object in the coming weeks!
add a skeleton here at some point
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Chinese astronauts Col. Zhang Lu, Maj. Wu Fei and Dr. Zhang Hongzhang are aboard the Shenzhou-21 spaceship scheduled for launch shortly (1544 UTC)
7 days ago
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Starlink Group 10-37 launched at 1635 UTC Oct 29 from Canaveral. Japan's HTV-X1 cargo ship arrived at ISS Oct 29 and was berthed at the nadir port on Harmony at 1850 UTC
9 days ago
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Astronauts Ryzhikov and Dubritskiy made spacewalk VKD-65 from the Poisk airlock on Oct 28, with hatch open from 1418 to 2112 UTC and depressurization from 1357 to 2115 UTC. Among other activities they installed the IPI-500 experiment on the Nauka module
10 days ago
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The first 10 Lockheed Martin SDA T1TL-C sats launched on Oct 14 (out of 21 aboard) have been cataloged in Space-Track as SDA-1664 to SDA-1673
10 days ago
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LAUNCH at 0043 UTC Oct 28 of Starlink Group 11-21 from Vandenberg
11 days ago
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Three elsets now available for HTV-X1, showing it successively in a 302 x 334 km, 347 x 389 km and 406 x 412 km orbit.
11 days ago
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Based on analysis of TLEs, the Chinese Space Station made a 3.2 m/s reboost on Oct 17 at about 0947 UTC
12 days ago
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I suspect that 2025 US6 is actually SSN 60058, the Chinese DRO-B lunar probe, in a 144000 x 382000 km x 28.2 deg orbit
add a skeleton here at some point
12 days ago
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Three objects from China's GF14-02 launch cataloged in 477 x 491 km, 372 x 516 km, and 484 x 545 km sun sync orbits with 10:26 LTDN orbit plane. No orbit data yet for Japan's HTV-X1.
12 days ago
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LAUNCH at 1500 UTC of Starlink 10-21 from Canaveral
12 days ago
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LAUNCH at 0355 UTC Oct 26 of a CZ-3B from Xichang with the 高分十四号02星 (Gao Fen 14-02) topographic mapping satellite to sun-sync orbit.
12 days ago
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LAUNCH at 0000 UTC Oct 26 of JAXA H3 flight F7 with the ISS-bound HTV-X1 cargo ship.
13 days ago
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Space-Track has cataloged another payload deployed from the 2024-134 USSF-51 launch (which went up in July 2024). It's now clear that one of the three main USSF-51 payloads is an ESPA-class tug like the LDPE-2 one on 2022-144 with lots of subsats
13 days ago
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LAUNCH at 1420 UTC Oct 25 of Starlink Group 11-12 from Vandenberg
13 days ago
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reposted by
Jonathan McDowell
COMSPOC Corp.
14 days ago
Spacebook.com
consolidates a comprehensive set of space object information and metadata. It draws upon a rich set of space object databases and historical archives, including Space-Track.org, CelesTrak, Jonathan McDowell’s (
@planet4589.bsky.social
) GCAT, and COMSPOC. (1/4)
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New orbit data for Spainsat NG-II showing it in a 409 x 62984 km x 26.8 deg orbit.
14 days ago
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One of two expected objects from the TJS-20 launch cataloged in a 178 x 41620 km x 16.4 deg geotransfer orbit. Spainsat NG-2 cataloged in a 32 x 60537 km x 26.7 deg supersync transfer orbit with very low (possibly spurious?) perigee height
14 days ago
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Via ABC news, Planet imagery showing the change in the view from space of the White House over the past month
15 days ago
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LAUNCH at 1430 UTC Oct 23 of a Chang Zheng 5 from Wenchang with the Tongxin Jishu Shiyan 20 sat, probably to geotransfer orbit. LAUNCH at 0130 UTC Oct 24 of Falcon 9 from Canaveral with the Spainsat NG-II comms sat for Hisdesat; stage 1 not to be recovered
15 days ago
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LAUNCH at 1416 UTC Oct 22 of Starlink 11-5 from Vandenberg
16 days ago
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North Korea's Manligyeong-1 F3 spy sat, launched in 2023, made another orbit reboost on Oct 2, showing that it is still working.
17 days ago
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Nice review article in Nature Astronomy celebrating 25 years of the Chandra mission
www.nature.com/articles/s41...
17 days ago
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Looks like the UA1093 incident is tentatively confirmed to be a balloon and not space debris, per this exchange on the other site
18 days ago
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Alternative explanation for the UA1093 incident
add a skeleton here at some point
18 days ago
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reposted by
Jonathan McDowell
Astronomer Royal for Scotland | Catherine Heymans
18 days ago
🔊Announcing a new Physics/Astro PhD scholarship scheme in Edinburgh, for students from a Black heritage, inc mixed Black background. Please help me spread the word. The scholarship covers all tuition fees, living costs & research travel.
#blackinSTEM
🔭👩🔬⚛️ ℹ️:
www.ph.ed.ac.uk/studying/pos...
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