Rob_K
01-04-2015, 12:41 PM
This was put up as PNV J17291350-1846120 on CBAT's Transient Objects Confirmation Page (TOCP) by Yukio Sakurai of Mito, Ibaraki-ken, Japan, discovery date 29.77 March 2015. Yukio is a prolific nova discoverer, congratulations on another! Discovery mag 12.2 so quite faint, although it appears to have now brightened into the high mag 11s. The object was quickly confirmed and a spectrum has been taken by Fujii consistent with it being a He/N type nova. No CBET has been issued yet.
http://www.cbat.eps.harvard.edu/unconf/followups/J17291350-1846120.html
http://otobs.org/FBO/fko/nova/pnv_j17291350-1846120_20150330.png
Anyway, at the start I thought being quite faint it might end up a dwarf nova but I checked the position anyway. There was something strangely familiar about it - then I twigged that I'd imaged the field a couple of nights before (27 March) when comet 218P was very close to the PNV position. When I checked the subs the object was clearly visible! The subs were rubbish but my best guess for the brightness was V~13.7. This was outside the limiting magnitude reported by observers who had picked up nothing in the position the night before (28 March). So I reported the pre-discovery detection to TOCP. It seems the nova rose quite slowly (1.5 mag in 2.1 days, from 13.7 to 12.2).
Far too faint for me to get a spectrum but I imaged it again last night (attached), est magnitude 11.8 (~V). Good luck to those able to attempt a spectrum!
Cheers -
http://www.cbat.eps.harvard.edu/unconf/followups/J17291350-1846120.html
http://otobs.org/FBO/fko/nova/pnv_j17291350-1846120_20150330.png
Anyway, at the start I thought being quite faint it might end up a dwarf nova but I checked the position anyway. There was something strangely familiar about it - then I twigged that I'd imaged the field a couple of nights before (27 March) when comet 218P was very close to the PNV position. When I checked the subs the object was clearly visible! The subs were rubbish but my best guess for the brightness was V~13.7. This was outside the limiting magnitude reported by observers who had picked up nothing in the position the night before (28 March). So I reported the pre-discovery detection to TOCP. It seems the nova rose quite slowly (1.5 mag in 2.1 days, from 13.7 to 12.2).
Far too faint for me to get a spectrum but I imaged it again last night (attached), est magnitude 11.8 (~V). Good luck to those able to attempt a spectrum!
Cheers -