Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Wed, 10/26/2016 - 06:17
ASAS-SN Discovery of A Likely Galactic Nova ASASSN-16ma on the Rise (Krzysztof Stanek et al., ATel #9669):
http://www.astronomerstelegram.org/?read=9669
Coordinates: R.A. 18h20m52.12s, Decl. -28°22'13.52" (J2000.0)
Quote:
"ASASSN-16ma was discovered in images obtained on 2016-10-25.02 at V~13.7 and proceed to brighten to V~11.6 a day later (UT 2016-10-26.02). We do not detect (V>17.3) the object in images taken on UT 2016-10-20.04 and before. No previous outbursts are detected at this location since ASAS-SN started observing the Galactic center in March 2016."
Thanks Kris and Patrick for the timely notifications.
I was able to obtain the following:
000-BMC-060 Oct 26.0567 11.76B (0.07)
000-BMC-060 Oct 26.0575 11.44V (0.03)
000-BMC-060 Oct 26.0590 11.44Clear (0.12)
comparisons used were 88 (000-BJJ-246, quite close to the transient), 92 (000-BCC-012, quite distant), and 115 (000-BCB-974, quite distant).
Best regards,
Steve
Meanwhile this probable nova was found in Japan, too:
"2016 10 26.380 UT: Discovered on frames by Yukio Sakurai, Mito, Japan, using Nikon D7100 digital camera + 180-mm f/2.8 lens. Nothing is visible at this location on two frames (limit mag.= 11.0) taken on 2016 Oct. 23.398 UT."
http://www.cbat.eps.harvard.edu/unconf/followups/J18205200-2822100.html
Paul Luckas (International Centre for Radio Astronomy Research, Univ. of Western Australia; ARAS Group):
Spectroscopic confirmation of ASASSN-16ma as a classical nova in the Fe-curtain stage
http://www.astronomerstelegram.org/?read=9678
Plot of this spectrum: http://www.astrosurf.com/aras/Aras_DataBase/Novae/2016_NovaSgr2016d.htm
Roberto K. Saito et al.: The likely progenitor of Nova ASASSN-16ma
http://www.astronomerstelegram.org/?read=9680
OGLE-IV pre-discovery observations (ATel #9683)
Two classical novae located toward the Galactic bulge were recently discovered. Both objects are located in the area that is regularly monitored by the OGLE-IV Survey.
...
ASASSN-16ma (ATels #9669, #9678, #9680) is located in the OGLE-IV field BLG531. We measured the nova centroid on two 10-s exposures acquired on October 27: R.A. = 18:20:52.25, Decl. = -28:22:12.1 (J2000.0). The accuracy of astrometric transformations is about 0.1 arcsec. The progenitor is undetected in the OGLE deep template image, meaning I > 22 mag. Saito et al. (ATel #9680) proposed that star VVV J182052.14-282212.8 is the pre-nova. That star is located 1.6 arcsec from the nova and it cannot be the progenitor. Finding charts can be found here: http://ogle.astrouw.edu.pl/cont/4_main/var/ASASSN-16ma.pdf
...
AAVSO Alert Notice 561 announces and reports on the nova in Sgr, ASASSN-16ma = PNV J18205200-2822100. Please see the notice for details and observing instructions.
Many thanks, and good observing,
Elizabeth Waagen, AAVSO HQ
I have only a very small window to observe the two novae but it's possible from 45°N.
While TCP J18102829-2729590 is fading this second one is brillant now.
My visual estimation tonight was +6.9 / +6.8 with a nice orange-red color. Very interesting!
Michel