NGC 253-dw2

Date of the discovery: 24 January 2016

Short Description: NGC 253-dw2 is a dwarf spheroidal (dSph) galaxy candidate undergoing tidal disruption around the nearby galaxy NGC 253. It is the first such event discovered outside the local group. The galaxy was discovered by an amateur astronomer with a small-aperture amateur telescope.

Amateur astronomer(s): Alessandro Maggi, Mike Sidonio

Researchers in the discovery paper: Aaron J. Romanowsky, David Martínez-Delgado, Nicolas F. Martin, Gustavo Morales, Zachary G. Jennings, R. Jay GaBany, Jean P. Brodie, Eva K. Grebel, Johannes Schedler, Michael Sidonio

Link to paper in ADS: https://ui.adsabs.harvard.edu/abs/2016MNRAS.457L.103R/abstract

SIMBAD page: http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+253-dw2&submit=SIMBAD+search

Telescopes involved: Takahashi Epsilon 180ED astrograph (18-cm diameter at f/2.8), 12-in f/3.8 Newtonian, 0.5 m Black Bird Remote Observatory, Chilean Advanced Robotic Telescope (CHART32), Subaru telescope

Figure 1 of the paper, showing the amateur image by Mike Sidonio with the 12-in telescope. The color image of NGC 253 is from the 0.5 m Black Bird Remote Observatory and the zoomed-in region is from CHART32. On the right is the image by Subaru.
slv207fig1-1
Other pages:

wikipedia: https://en.wikipedia.org/wiki/Sculptor_Galaxy#Satellite

Credit for the header image: Romanowsky et al. 2016, Subaru

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