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Nr 34 2020

Kometen går itu

Att något gått galet med ATLAS-kometen – eg. C/2019 Y4 (ATLAS) – det har vi ju förstått, om ingenting annat så visade ju Håkan Barregårds bild på den tilltagande fragmenteringen. Scrolla ner till Håkans bild här i W-bloggen nr 31.

Från The Astronomer´s Telegram uppfångar vi detta HST-bildbidrag, författare Quanzhi Ye (U. Maryland) och  Man-To Hui (U. Hawaii).  Vi kör på engelska i originalskicket:

”We report the continuing fragmentation of long-period comet C/2019 Y4 (ATLAS), initially reported by ATel #13620, #13622, and #13629, with four major fragments designated A to D in MPEC 2020-H28 using ground-based observations up to UT 2020 April 18. Single-epoch observation with Hubble Space Telescope on UT 2020 April 20.5 (HST/GO-16089, PI Ye) showed only two remaining major fragments, likely A and B in the Minor Planet Center identification, each consists of 1 to 2 brighter components and a couple more fainter components, situated 4 arcsec from each other along their common orbit. Fragments C and D seem to have been reduced into a handful of fainter fragments. At the time of the observation, the comet was at a heliocentric distance of 1.10 au and a geocentric distance of 0.98 au. A preliminary composite image can be found at https://www.astro.umd.edu/~qye/shared/2019Y4_HST_20200420.png.
This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program HST GO 16089.”

Toppmöte över Åhus

Tack till kompisen Christer Svärd som dokumenterat detta toppmöte över Åhus: Venus ovan, månen nedan. Tittips: Dubbelklicka upp bilden på din skärm!

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