January 31, 2018
Event: Nova in Circinus - Nova Cir 2018 = PNV J13532700-6725110 [FM Cir]
Discovered by: John Seach (Chatsworth Island, NSW, Australia)
Discovery magnitude: 9.1 unfiltered CCD (on three images, using DSLR with 50 mm f/1.2 lens)
Discovery date: 2018 January 19.708 UT
Coordinates (2000.0): R.A. 13 53 27.59 Decl. -67 25 00.9
Spectra: Low-resolution spectroscopy indicating that PNV J13532700-6725110 is a nova was obtained by S. Kiyota (Kamagaya, Japan) on 2018 January 20.5916 UT using the T17 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD at SSO, NSW, Australia. His spectrum may be seen at: http://meineko.sakura.ne.jp/ccd/PNV_J13532700-6725110-spe.jpg
J. Strader et al. (Michigan State) report (ATel #11209) that a spectrum obtained with the Goodman spectrograph on the SOAR telescope on 2018 Jan 21.36 UT shows PNV J13532700-6725110 to be a nova of the Fe II class.
Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands as instrumentation permits are strongly encouraged as the nova evolves. Dr. Koji Mukai (NASA Goddard Space Flight Center) recommends that observers use B, V, and I filters if possible to enable studying any color changes.
Target-of-opportunity observations requested by Dr. Mukai are taking place now through February 6 UT with the NASA Fermi Gamma-ray Space Telescope. To support these observations, observers are asked to make several observations per night.
Observations of this nova with the NASA Neil Gehrels Swift Observatory (formerly the Swift Gamma-Ray Burst Mission) have been requested.
Observations reported to the AAVSO:
2018 Jan. 18.7 UT, <11.0 (J. Seach, Chatsworth Island, NSW, Australia; CBET 4482);
18.341 UT, 15.75 V (ASAS-SN Sky Patrol, pre-discovery, probably contaminated by nearby stars; reported via CBET 4482 by P. Schmeer, Saarbruecken-Bischmisheim, Germany);
18.8375, 10.9 (A. Pearce, Nedlands, W. Australia);
19.339, 9.00: V (ASAS-SN);
19.86806, 8.2 (Pearce);
20.00140, 8.291 TG +/-0.022 (D. Blane, Henley-on-Klip, South Africa);
20.00140, 8.703 TB +/-0.028 (Blane);
20.01042, 8.2 (C. Adib, Porto Alegre, Brazil);
20.15848, 9.12 V (A. Chapman, Argentina; CBET 4482);
20.27778, 8.5 (A. Amorim, Florianapolis, Brazil);
20.48958, <9.6 (L. Shotter, Uniontown, PA);
20.5868, 8.22 Ic (S. Kiyota, Kamagaya, Japan; remotely at Siding Spring Obs., NSW, Australia; CBET 4482);
20.5868, 8.37 Rc (Kiyota);
20.5868, 8.48 V (Kiyota);
20.5868, 8.62 B (Kiyota);
20.602, 8.09 R (E. Guido; remotely at Siding Spring Obs., NSW, Australia; CBET 4482);
20.602, 8.33 V (Guido);
20.63303, 8.59 V +/-0.04 (L. Izzo, Rome, Italy);
20.63344, 8.54 R +/-0.03 (Izzo);
20.63400, 7.19 I +/-0.03 (Izzo);
20.65527, 8.739 B +/-0.007 (Pearce);
20.65910, 8.408 V +/-0.002 (Pearce);
20.65957, 8.393 R +/-0.005 (Pearce);
20.66017, 8.121 I +/-0.009 (Pearce);
20.78890, 8.5 (Pearce);
21.36042, 9.3 (R. Tyson, Freeport, NY);
21.38542, 8.454 V +/-0.019 (J.-F. Hambsch, Mol, Belgium; remotely at Atacama, Chile);
21.38558, 8.459 V +/-0.020 (Hambsch);
21.38576, 7.909 I +/-0.026 (Hambsch);
21.38594, 7.867 I +/-0.027 (Hambsch);
21.38625, 8.835 B +/-0.024 (Hambsch);
21.38652, 8.830 B +/-0.025 (Hambsch);
21.64236, 8.3 (C. Wyatt, Walcha, NSW, Australia);
21.78260, 8.6 (Pearce);
22.51806, 8.2 (Wyatt);
22.56800, 8.029 TR +/-0.137 (D. Benn, Klemzig, S. Australia);
22.56800, 8.195 TG +/-0.04 (Benn);
22.56800, 8.435 TB +/-0.057 (Benn);
22.75000, 8.3 (N. Brown, Two Rocks, W. Australia);
22.81880, 8.4 (Pearce);
23.00347, 8.3 (Adib);
23.31528, 8.3 (Amorim);
23.59271, 7.760 TR +/-0.058 (Benn);
23.59271, 7.943 TG +/-0.012 (Benn);
23.59271, 8.234 TB +/-0.015 (Benn);
23.64550, 7.79 V +/-0.01 (M. Urbanik, Cadca, Slovakia);
23.64628, 7.89 V +/-0.01 (Urbanik);
23.74806, 8.001 B +/-0.005 (Pearce);
23.74882, 7.797 V +/-0.003 (Pearce);
23.75490, 8.2 (Pearce);
24.02083, 7.8 (Adib);
24.80070, 7.8 (Pearce);
25.25694, 7.2 (W. De Souza, Sao Paulo, Brazil);
25.36875, 8.0 (Tyson);
25.45486, 7.2 (R. Kaufman, Bright, VIC, Australia);
25.53472, 7.2 (S. Dieters, Australia);
25.82150, 7.3 (Pearce);
26.60070, 6.853 TR +/-0.034 (Benn);
26.60070, 7.055 TG +/-0.007 (Benn);
26.60070, 7.362 TB +/-0.020 (Benn);
26.76000, 6.8 (Brown);
26.80000, 7.0 (Pearce);
27.09722, 6.7 (Adib);
27.35486, 7.5 (Tyson);
27.46181, 6.6 (Kaufman);
27.55063, 6.124 TR +/-0.071 (Benn);
27.55063, 6.323 TG +/-0.018 (Benn);
27.55063, 6.637 TB +/-0.044 (Benn);
27.78900, 6.4 (Pearce);
28.62847, 6.4 (Kaufman);
28.76320, 6.4 (Pearce);
29.76670, 7.3 (Pearce);
30.08472, 7.3 (Amorim);
30.82640, 7.4 (Pearce);
31.08333, 7.5 (Adib);
31.55556, 7.4 (Kaufman);
31.58890, 7.4 (Pearce);
Charts: Charts with a comparison star sequence for Nova Cir 2018 may be created using the AAVSO Variable Star Plotter (VSP) using the name Nova Cir 2018. To see the brighter end of the sequence, request a 'b' or even an 'ab' scale chart.
Submit observations: Please submit observations to the AAVSO International Database using the name NOVA CIR 2018. Once a GCVS name is announced in an IAU Circular or CBET, please use that name.
Nova Cir 2018 is the topic of the AAVSO Time Sensitive Alerts forum thread https://www.aavso.org/pnv-j13532700-6725110-possible-nova-91-mag-circinus-near-border-musca and the Novae forum thread https://www.aavso.org/pnv-j13532700-6725110-possible-nova-91-mag-circinus-near-border-musca-0.
Notes:
a. Designated PNV J13532700-6725110 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 4482. Spectroscopy details are in ATel #11209.
b. Seach reports that nothing was seen at the position on the relevant DSS2-red plate.
c. P. Schmeer reports no previous eruptions or outbursts of this object were detected by the ASAS-SN Sky Patrol since 2016 February. An ASAS-SN light curve through Jan. 19 may be seen at: https://asas-sn.osu.edu/light_curves/cc250347-447a-4d9e-9d76-ef0ce071e66c
d. P. Schmeer reports a Gaia DR1 source (position end figures 27.59s, 00.9"; G= 17.28 mag) is located only 0.3" from Chapman's position, which has an uncertainty of 0.3". He also reports the UV source GALEX J135327.5-672500 (position end figures 27.57s, 00.7"; NUV= 18.9 mag) is only 0.2" away.
e. Position end figures (J2000.0)
- A. Chapman (2018 Jan. 20.15848 UT): 27.60s, 00.7"
- E. Guido (2018 Jan. 20.602 UT): 27.57s, 01.0"
- A. Pearce (2018 Jan. 20.659 UT): 27.55s, 00.9"
f. Images
- E. Guido (2018 Jan. 20.602 UT): http://bit.ly/2Dlr6Ko
g. Animation by E. Guido (2018 Jan. 20.6 UT) showing a comparison between the confirmation image and the archive POSS2/UKSTU Red plate (1997-03-31): http://bit.ly/2DkMlw4
Congratulations to John Seach on his latest discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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