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@cosmos4u@scicomm.xyz
2026-06-26 19:17:27

A Potential Signature of HD 7977's Passage Among Observed Long-Period #Comet Orbits: arxiv.org/abs/2606.25069 -> Long-Period Comets’ Orbits Reflect Close Passage by Star HD 7977: psi.edu/blog/long-period-comet

@cosmos4u@scicomm.xyz
2026-04-25 22:23:23

The #comet C/2025 R3 (PANSTARRS) will soon leave the FOV of CCOR-1: cropped pictures from 18:15 and 21:30 UTC on 25 April - and the also the bottom of skyweek.wordpress.com/2026/04/ for many more images!

@cosmos4u@scicomm.xyz
2026-04-26 20:59:58

Byebye, #comet C/2025 R3 (PANSTARRS), now also exiting the LASCO C3 FOV: time lapses at facebook.com/watch/?v=10061436 and facebook.com/watch/?v=19915760, a 9:30 UTC still with the funny new tail feature better visible at bsky.app/profile/huubeggen.bsk, CCOR time lapses at x.com/frapepppemaria/status/20 and x.com/swnews/status/2048180407 and bsky.app/profile/aretsch.bsky. and a HI2 time lapse - with the plasma tail wagging - at x.com/swnews/status/2048007525.

@cosmos4u@scicomm.xyz
2026-04-24 14:37:12

The #comet C/2025 R3 (PANSTARRS) is now also in the field of view of the coronagraph CCOR-1: ccor.nrl.navy.mil/ccor_realtim = the latest image (the one here is from 14:00 UTC), ccor.nrl.navy.mil/realtime-mov = an animation up to now (and see soho.nascom.nasa.gov/data/real for the LASCO C3 view).

@cosmos4u@scicomm.xyz
2026-04-24 22:29:01

The #comet C/2025 R3 (PANSTARRS) is joined by a nice CME in the CCOR-1 image from 22:00 UTC.

@cosmos4u@scicomm.xyz
2026-04-15 08:35:22

Attempting to pick #comet C/2025 R3 (PANSTARRS) ouf of dawn today in MŸn at 55°N, at 4:13, :33 and :39 CEDT: solar depressions 14.5°, 12 1/3° and 11 3/4°, comet elevations 7 1/3°, 10° and 10 3/4° - so darker sky is more important that higher elevation. Visually the comet was underwhelming in 11x70 binoculars: that's certainly one for (bigger) cameras, not the eye. And the viewing window is closing fast anyway.

@cosmos4u@scicomm.xyz
2026-04-10 00:27:56

The most interesting #comet right now, C/2025 R3 (PANSTARRS), imaged by Michael Jäger and Gerald Rhemann on the morning of 9 April in Martinsberg, Lower Austria with a 12"/4 Lacerta-Newton QHY 600 - the brightness at that time was around 5.5 mag. so the hoped-for forward scattering surge is much subdued ... too little dust in the coma? If it stays that way the coma brightness would only rise by another magnitude or so before the comet is lost in the twilight mid-month - but enjoy its great plasma tail (even accessible to low-end smart telescopes, by the way) while you can.

@cosmos4u@scicomm.xyz
2026-05-04 00:05:00

What #comet C/2025 R3 (PANSTARRS) looks like now - for a 12-inch telescope in Namibia last evening, by Gerald Rhemann & Michael Jäger: the dust tail, lacking the forward scatter enhancement around solar conjunction, is invisible again, the plasma tail is just as gorgeous as in April.

@BBC3MusicBot@mastodonapp.uk
2026-04-12 21:24:37

🇺🇦 #NowPlaying on BBCRadio3's #NightTracks
Giovanni de Macque & Comet Musicke:
🎵 Capriccio sopra re fa mi sol
#GiovannideMacque #CometMusicke
open.spotify.com/track/7L5gttB

@cosmos4u@scicomm.xyz
2026-06-02 22:33:01

The #comet 220P/McNaught has suffered a major outburst and shines now - in this Rhemann / Jäger image from a few hours ago with a faint plasma tail even - at about 8th magnitude: groups.io/g/comets-ml/topic/11 = a thread, bsky.app/profile/lukemeister.b = the light curve, facebook.com/photo/?fbid=26645 and facebook.com/photo/?fbid=10240 and facebook.com/photo/?fbid=29512 and facebook.com/photo/?fbid=44320 and x.com/kpheider/status/20617920 = pictures from 2 June.

@cosmos4u@scicomm.xyz
2026-06-03 17:18:25

Electron Affinity of the Carbon Dimer from Threshold Photodetachment Spectroscopy: #comet spectra) -> Prä­zi­si­ons­mes­sung lie­fert neuen Rekord­wert: uibk.ac.at/de/newsroom/2026/pr - ein Team um den Inns­bru­cker Physiker Roland Wester hat eine funda­men­tale Eigen­schaft des Kohlen­stoff-Dimers mit bisher uner­reichter Genau­ig­keit im Labor bestimmt.

@cosmos4u@scicomm.xyz
2026-03-29 00:46:13

What #comet C/2025 R3 (PANSTARRS) - more pictures from the 28th in danilopivato.com/solar_system/ and facebook.com/photo/?fbid=34496 and x.com/hositosorekara/status/20 and facebook.com/groups/2270023586 - may be up to brightness-wise and what the viewing geometry will be in central Europe: explanations in skyweek.wordpress.com/2026/03/

@cosmos4u@scicomm.xyz
2026-03-28 15:35:01

Lots of fascinating detail in the plasma tail of #comet C/2025 R3 (PANSTARRS) this morning in an image by Christoph Gerhard with a 30-cm telescope: klostersternwarte.de/aktuelles - this one will stay with us (Northerners) for another three week low before/at dawn before getting lost in the Sun's glare (when dust forward scattering could brighten it even more).