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coatesg

New transient in Monoceros (ASASSN-19de)

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From BAA VSS group - see image below as just taken:

 

Untitled.thumb.jpg.b41d44015d088da58bf64ee271e944b4.jpg

 

TCP J06373299-0935420 (UG:)

Discovery details:
R.A. 06h37m32.99s, Decl. -09°35'42.0" (J2000.0)
2019 Feb. 21.4516 UT, 10.4 mag (CCD, unfiltered)
Discoverer: Shizuo Kaneko (Kakegawa, Shizuoka-ken, Japan)

2019 02 21.452 UT
Discovered by S. Kaneko, Kakegawa, Shizuoka-ken, Japan, with
on 10-s exposure on eight frames using Canon 6D digital
camera + 200-mm f/2.8 lens under the limiting mag = 14.5,
who writes that nothing is visible at this location on a
frame taken on 2019 Feb. 20.447 UT with limit mag.= 14.7.

2019 02 21.65 UT
A (blue) progenitor candidate from Gaia DR2 is 0.3" away at
R.A. 06h37m33.004s, Decl. -09°35'42.15" (equinox J2000.0,
epoch 2015.5; Gmag. 19.21, parallax 2.7192 ± 0.4374 mas,
distance ~0.38 kpc). Other designations are
USNO-A2.0 0750-02439919 (Bmag. 18.6, Rmag. 18.9),
USNO-B1.0 0804-0087491, GSC2.3 S3BJ014199 (Fmag. 18.9,
Bjmag. 19.4), WISE J063733.02-093541.9,
PSO J063733.002-093542.127 (gmag. 19.47, rmag. 19.32).
Observations by the ASAS-SN Sky Patrol (Shappee et al.
2014ApJ...788...48S and Kochanek et al. 2017PASP..
129j4502K) of the current brightening:
2019 Feb. 13.291 UT, gmag. fainter than 16.45;
21.156, gmag. 12.56.
No previous eruptions or outbursts were recorded since
2012 Jan. 29; complete light curve at
https://asas-sn.osu.edu/light_curves/aef18120-7c35-4b28-9a31-2e083608bf8f
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

http://www.cbat.eps.harvard.edu/unconf/followups/J06373299-0935420.html

Multiband and time-resolved photometry, spectroscopy,
and precise astrometry are urgently required.

Edited by coatesg
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Chart:

X24204AKO.png

Updated - better chart with brighter comps.

Edited by coatesg
New chart
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