PNV J15384000-4744500: possible nova (9.0 mag) in Lupus – another discovery by Rob Kaufman

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Mon, 06/04/2018 - 08:55

PNV J15384000-4744500 (N:)

R.A. 15h38m43.84s, Decl. -47°44'41.07" (J2000.0) (S. Kiyota)
2018 June 3.4306 UT, 9.1 mag (CCD, unfiltered)
Discoverer: Rob Kaufman (Bright, Victoria, Australia)

2018 06 03.4306 UT
Object discovered by Rob Kaufman (Bright, Victoria, Australia) at White Cliffs, NSW, Australia; object visible in 5 DSLR frames taken with 55mm lens. Position approximate - astrometry required. No minor planets or comets at this position, nor known variables in VSX. Last ASAS-SN observation 22 May 2018, nothing to 15.697 V. Discovery image here:…

2018 06 03.5670 UT
Photometry results were B=9.69, V=8.98, Rc=8.60 and Ic=8.19 with iTelescope T17 (0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD) at Siding Spring Observatory, NSW, Australia. Position end figures were 43.84 and 41.07 in R.A. and Dec. Low resolution spectrum, taken with same telescope, might show Ha emission but not significant.
Seiichiro Kiyota (Kamagaya, Japan)

2018 06 03.63 UT
A Gaia DR2 star of magnitude 19.36 G is 1.0" from the position reported by Kiyota-san; another designation for this star is GSC2.3 S8TZ090424 (15 38 43.898 -47 44 40.87; F= 17.55, Bj= 20.19, N= 17.70 mag). No previous outbursts or eruptions were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) since 2016 March; the latest available observation is 2018 May 22.2374 UT, fainter than magnitude 15.8 V:…
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

*** Spectroscopy and multiband photometry are urgently required. ***

Clear skies,

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Follow-up observations by Alexandre Amorim (AAX)

Copied from the 'Cataclysmic Variables (CVs)' forum:

While we waiting for inclusion on VSX, follows my visual observations
20180603 2116 UT, mag = 9.7 using 93 and 99 from Tycho-2 and 3 hours later
20180604 0016 UT, mag = 9.6 using same comps
90mm f/10 refractor eyepiece 25mm

with regards,

Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
SALT high-resolution spectroscopy of 'Nova Lupi 2018'

E. Aydi (South African Astronomical Observatory, University of Cape Town), D. A. H. Buckley (SAAO), S. Mohamed (SAAO, UCT), P. A. Whitelock (SAAO, UCT):
"SALT high-resolution spectroscopy of nova PNV J15384000-4744500"

American Association of Variable Star Observers (AAVSO)
Alert Notice 637 on N Lup 2018 = PNV J15384000-4744500

AAVSO Alert Notice 637 announces and reports on the discovery of Nova Lup 2018 = PNV J15384000-4744500. Please see notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

N Lup 2018 recent rebrightening

Not a huge number of observations of this nova coming in but the light curve appears to show a recent short-term brightening, centred on around 24-25 June 2018.  It had been drifting along in the low mag 10s, perhaps slightly fading, when it rose to mag 9.6-9.8.  It has since fallen.  From some shots I took at the time it appeared considerably brighter than the 9.9 comp star.  There may have been other peaks too, bit hard to tell with the paucity of observations and the scatter you seem to get with these red objects.  Anyway, worth following if you can.  Of course, I'm completely unbiased!

Cheers -

Rob Kaufman  KBJ