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Notes & Essays
Extragalactic astronomy, light from distant worlds.
April 26, 2023
Messier 101 (M101), also known as the Pinwheel Galaxy, is a grand design spiral galaxy in the constellation of Ursa Major. Located nearby – just…
April 2, 2023
Messier 86 (M86, NGC 4406) is one of the most prominent elliptical galaxies in the Virgo Cluster of galaxies, located relatively nearby – just 55.6…
Optically Variable Quasars in AllWISE/PS1
March 26, 2019
My latest publication (2018) abstract: Multi-wavelength variability, arising due to the supermassive black hole accretion instabilities, is one of the intrinsic characteristics of active galactic…
NGC 5907 and KAZF Extragalactic Globular Clusters
October 12, 2016
NGC 5907—”Splinter” Galaxy in Draco with identified Kissler-Patig+Ashman+Zepf+Freeman extragalactic globular clusters 50 million light years away.
October 8, 2016
Ultra-deep view of the Whirlpool Galaxy—a collaboration project initiated by Yuri Toropin.