[vsnet-alert 25774] ATLAS21nlm = AT 2021koe: large-amplitude object in Orion

Denis Denisenko d.v.denisenko@gmail.com via vsnet-alert vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Thu Apr 29 01:30:00 JST 2021

ATLAS21nlm was posted by ATLAS team (J. Tonry et al.) to TNS as AT 2021koe,
see https://www.wis-tns.org/object/2021koe

ATLAS forced photometry (Tonry et al., 2018; Heinze et al., 2018):

  20210409.2629  <204c   ATLAS
  20210425.2320  16.34o  ATLAS
  20210427.2347  16.46o  ATLAS
  20210427.2379  16.57o  ATLAS
  20210427.2434  16.52o  ATLAS
  20210427.2535  16.59o  ATLAS

Pan-STARRS DR1 position: 05 12 46.98 +13 53 43.8
i=17.63+/-0.02 z=17.10+/-0.01

Outburst to z=17.1 on 2013-09-21.578 UT PanSTARRS-1 image, fading to y~21
on 2013-10-19.486 UT, then brightening to i=17.6 on 2013-11-06.600 and
06.612 UT.

It is not clear whether PS1 detection on Nov. 06 was another outburst or
the rebrightening after the September 2013 outburst. Since there were no
other outbursts in 6 years of ATLAS data, those detections were likely two
parts of one superoutburst.

Unfortunately this potentially interesting object in Orion will be in the
solar conjunction on June 9th.

Denis Denisenko

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