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Comets & Asteroids - Summary for April & May 2018

31 May 2018, 13:59 UTC
Comets & Asteroids - Summary for April & May 2018
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During the 2-month period April through May 2018, 1 new comet was discovered, cometary activity was detected for 2 previously discovered object (earlier designated as an asteroid) and there was 1 comet recovery. "Current comet magnitudes" & "Daily updated asteroid flybys" pages are available at the top of this blog (or just click on the underline text here). See below for the "Other news" section.The dates below refer to the date of issuance of CBET (Central Bureau Electronic Telegram) which reported the official news & designations.- Comet DiscoveriesApr 26 Discovery of P/2018 H2 (PANSTARRS)- Cometary activity detectedApr 17 Cometary activity detected in A/2018 F4 = C/2018 F4 (PANSTARRS) *Apr 20 Cometary activity detected in 2018 EF9 = C/2018 EF9 (Lemmon)* This object initially received the unusual designation A/2018 F4 by G. V. Williams on MPEC 2018-F139 because of the hyperbolic orbit.See also MPEC 2018-H21: "This object, originally announced as A/2018 F4, is being redesignated as a comet. K. Sarneczky, Konkoly Observatory, reports that five stacked 120-s unfiltered CCD images taken on Apr. 9.9 UT with the 0.60-m Schmidt telescope at Piszkesteto, Hungary, show a broad fan-shaped coma of diameter nearly 6", elongated toward the east. R. Weryk (University of Hawaii) ...

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