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ASASSN-19ado: new transient (12.8 mag) in Perseus

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Mon, 12/23/2019 - 07:51

ASASSN-19ado = AT 2019xim (UG/N)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=1500094

Discovery details:
R.A. 02h15m29.99s, Decl. +57°17'53.4" (J2000.0)
2019 December 22.202 UT, gmag. 13.9
Discoverer: All-Sky Automated Survey for Supernovae (ASAS-SN)
https://wis-tns.weizmann.ac.il/object/2019xim

Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve: https://asas-sn.osu.edu/light_curves/3318ffd2-2779-45e3-987d-e082fa0f93…

Spectroscopy, precise astrometry, and multiband as well as time-resolved photometry are urgently required.

Clear skies,
Patrick

Deconinck Michel
Affiliation
American Association of Variable Star Observers (AAVSO)
Mon, 12/23/2019 - 21:15
Thank you Patrick 

Thank you Patrick 

I just made a visual observation 23/12 - 17h54 UT magn.: 12.9 with some Gaïa stars as comparison.

Clear skies

Michel

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Mon, 12/23/2019 - 22:31
Re: Thank you Patrick

My pleasure, Michel.
You wrote: "12.9 with some Gaïa stars as comparison."
I recommend APASS stars as comparison stars (and Gaia DR2 reference stars for astrometry).

Patrick

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Tue, 12/24/2019 - 19:05
Spectroscopic confirmation as a dwarf nova in outburst

Hiroyuki Maehara (National Astronomical Observatory of Japan): "Spectroscopic classification of ASASSN-19ado = AT 2019xim" (ATel #13371)
http://www.astronomerstelegram.org/?read=13371

Time-resolved photometry is urgently required (precise astrometry, too).

Clear skies,
Patrick