Assassin Picture of the Week

2013 August 11

Neptune Discovered!

OK, so maybe we are not the first to discover Neptune, but we were certainly glad to see it in recent Brutus data. Why? Planets and asteroids move, so they provide an excellent test for any transient detection system like ASAS-SN. In fact, we have been using asteroids to obtain approximate estimate of our detection efficiency and to refine our detection algorithms. In this case we are glad to see Neptune because it is so bright (V~8 mag) that it is saturated in our CCD data (the ring-like protrusions are actually saturation "bleeding columns"), and yet it was detected and passed various cuts we employ to seperate cosmic rays, image subtraction artifacts etc. from real transients.
See previous APOWs:

Multiband photometric follow-up of ASASSN-13aw (SN 2013dr);

"Assassin" Unit 1: Brutus;

How ASAS-SN Discovers Supernovae: Case of Supernova ASASSN-13bb;

NGC 2617: Dramatic Seyfert Type Change;

ASASSN-13/SN 2013da: Our First Supernova Three Weeks Later;

M31 and Companions;

This homepage is maintained by Ben Shappee and Kris Stanek. Sun Aug 11 10:30:51 EDT 2013

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