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AAVSO Alert Notice 609

Nova Muscae 2018 – PNV J11261220-6531086

15 January 2018

Event: Nova in Musca – Nova Muscae 2018 = PNV J11261220-6531086

Discovered by: Rob Kaufman (Bright, Victoria, Australia)

Discovery magnitude: 7.0 V (on four frames, using Canon 650D and 55mm lens)

Discovery date: 2018 January 14.4861 UT

Coordinates (2000.0): R.A. 11 26 15.16 Decl. -65 31 23.3

Position from VSX; measured by Daniel Bamberger (Marburg, Germany) on frames taken by Robert Fidrich (Bakonycsernye, Hungary).

Spectra: Low-resolution spectroscopy indicating that PNV J11261220-6531086 is an FeII-type classical nova was obtained by Rob Kaufman on 2018 January 14.6035 UT. His spectrum is here:

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands (BVI in particular) as instrumentation permits are strongly encouraged as the nova evolves.
Observations reported to the AAVSO:2018 Jan. 14.92620 UT, 6.714 TG +/-0.012 (D. Blane, Henley-on-Klip, South Africa);
15.19700, 6.85 (S. Otero, Buenos Aires, Argentina; visual obs);
15.3887, 6.5: V (J. Hambsch, Mol Belgium; image overexposed);
15.3887, 7.1: B (Hambsch; image overexposed);
15.51, 6.60 V (A. Henden, AAVSOnet BSM_S data; V obs nearly saturated);
15.51, 7.10 V (Henden, AAVSOnet BSM_S data);
15.54372, 6.7 (D. Benn, Klemzig, S. Australia);
15.57, 6.3: R (E. Guido and A. Noschese, remotely using iTelescope Observatory, Siding Spring; via TOCP);
15.57932, 6.974 V +/-0.001 (A. Pearce, Nedlands, W. Australia);
15.67277, 7.507 B +/-0.002 (Pearce);
15.71, 7.4: V (A. Valvasori, Siding Spring; via CBET 4472);

Charts: Charts with a comparison star sequence for PNV J11261220-6531086 may be created using the AAVSO Variable Star Plotter (VSP). Observers are cautioned that there is a magnitude 15.2 star 6" to the S. The name Nova Mus 2018 is being added to VSX; once it has been added, charts may be made using that name.

Submit observations: Please submit observations to the AAVSO International Database using the name PNV J11261220-6531086. The name Nova Mus 2018 is being added to VSX; once it has been added, observations should be submitted using that name. Once a formal GCVS name is announced in an IAU Circular or CBET, please use that name.


a. Designated PNV J11261220-6531086 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Unless otherwise noted and except for observations reported to the AAVSO, the information in this Alert Notice is taken from IAU CBET 4472.

b. P. Schmeer (Saarbrücken-Bischmisheim, Germany) reports that according to ASAS-SN Sky Patrol observations (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) and using the position determined by Bamberger, this nova eruption apparently began between 2018 January 1.25 and 3.24 UT (maximum brightness V = 8.8 mag on Jan. 3.24 UT):

d. Position end figures

- R. Kaufman (2018 January 14.4861 UT; discovery image): 12.20s, 08.6"

- E. Guido and A. Noschese (iTelescope Observatory, Siding Spring, 2018 Jan. 15.57 UT): 14.95s, 24.1".

- A. Valvasori (2018 Jan. 15.71 UT): 14.94s, 24.9"

e. P. Schmeer reports a Gaia DR1 source (G = 18.02 mag) is located 1.3" from Bamberger's position. Also, S. Otero (Buenos Aires, Argentina) in VSX identifies star Gaia DR1 5237407060614222336 (G = 18.0) at 11 26 15.00 -65 31 24.2 (2015.0) as a likely counterpart. He notes that the area is crowded.

f. Images

- R. Kaufman (Bright, VIC, Australia, 2018 Jan. 14.4861 UT; discovery image):

- E. Guido and A. Noschese (iTelescope Observatory, Siding Spring, 2018 Jan. 15.57 UT):

-A. Valvasori (2018 Jan. 15.71 UT):

g. Animation by E. Guido and A. Noschese (2018 Jan. 15.57 UT), comparing their image above with archive POSS2/UKSTU Red plate (1998-03-19):

Congratulations to Rob Kaufman on his latest discovery!

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

It’s all about the  standstills, those episodes where the star gets stuck at a mid-point between maximum and minimum. If it doesn’t exhibit standstills it isn’t a Z Cam star.

Data from Catalina Real Time Survey 

Drake et al. 2009, ApJ, 696, 87

Northern CVs brighter than 17th magnitude here.

Southern CV's brighter than 17th magnitude here.


Last updated 16:29 UT on 17 January 2018

New outbursts and unusual activity reported in the last 72 hours


NN Cen
V342 Cen
EI Psc
VZ Pyx
UW Tuc

AG Aps
V803 Cen
BE Oct

AR And

UV Gem
BI Ori
BX Pup
CRTS J174033.4+414756
SDSS J073208.11+413008.7
SDSS J074859.55+312512.6 

Current superoutbursts (since ...)
HV Aur (20180113; 
precursor on 20180110)
V1024 Per (20180113; precursor on 20180110)
KS UMa (20180111)
ASASSN-15rs (20180106)
Gaia18aak (20180101; superhump period ~0.068 d)
2QZ J015940.6-281040 # (20171231; Psh=
SDSS J032015.29+441059.3 (20171227)
MN Dra (20171226)
PTF1 J071912.13+485834.0 (171226; Psh=0.01858d)
RZ LMi (20171223; ER UMa subtype)
NSV 2026 (20171221)
V844 Her (20171219)
V1159 Ori (20171218; ER UMa subtype)
PNV J06501960+3002449 (20171217; Psh=0.06742d)
ASASSN-17pn (171122; 2nd outb. 1215, reb. 180113)

Z Cam-type dwarf novae at standstill
TZ Per (since 20171226)
HL CMa (since 20171221) 
IW And (since about 20171219)
Z Cam (20170405–20171207, 246 days)
IW And (20170812–20170831, 19 days)
OQ Car (20160415–20170826, 498 days)

# indicates a noteworthy or unusual outburst
:  indicates confirmation required
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.


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