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TCP J18104219-1534184 = Nova Serpentis 2020 (12.1 mag)




AAVSO Alert Notice 697: Nova in Sagittarius: 

V6566 Sagittarii = Nova Sagittarii 2020 = PNV J17561375-2942546

4 February 2020

Discovered independently by:
- Minoru Yamamoto (Okazaki, Aichi, Japan) (reported to CBAT by I. Endoh (NAO Japan))
- Yukio Sakurai (Mito, Ibaraki-ken, Japan) (reported to CBAT by S. Nakano (Sumoto, Japan))

Discovery magnitude:  
- Yamamoto: unfiltered CCD mag 11.5 (using a Canon 6D DSLR camera with a 180-mm f/3.5 lens)
- Sakurai: unfiltered CCD mag 10.5 (using a Nikon D7100 camera with a 180-mm f/2.8 lens)
 
Discovery date:
- Yamamoto: 2020 January 30.8568 UT
- Sakurai: 2020 January 31.841 UT

Coordinates (2000.0): R.A. 17 56 14.04   Decl. -29 42 58.2  (from VSX)

Spectra: Spectroscopy obtained by H. Akazawa (Funao, Kurashiki, Okayama, Japan) on 2020 Feb. 1.888 UT using a 0.35-m telescope (+ DSS-7 spectrograph + ST-402 camera) shows prominent H-alpha emission, characteristic of a nova.

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands as instrumentation permits are strongly encouraged as the nova evolves.

Observations reported to the AAVSO:
2020 Jan. 30.8568 UT, 11.5 CCD (M. Yamamoto, discovery image, via CBET 4720);
31.839, 11.5 CCD (Yamamoto, confirming image, via CBET 4720);  
31.841, 10.5 CCD (Y. Sakurai, discovery image, via CBET 4720);
Feb. 01.39604, 11.182 V +/-0.013 (J. Hambsch, Mol, Belgium);
01.39631, 11.187 V +/-0.014 (Hambsch);
01.39658, 9.303 I +/-0.031 (Hambsch);
01.39680, 9.344 I +/-0.031 (Hambsch);
01.39719, 12.451 B +/-0.028 (Hambsch);
01.39758, 12.385 B +/-0.029 (Hambsch);
01.752, 12.20 B (S. Kiyota, Kamagaya, Japan, iTelescope 0.50-m f/4.5 astrograph, Siding Spring, NSW, via CBET 4720);
01.752, 11.03 V (Kiyota);
01.752, 10.11 Rc (Kiyota);
01.752, 9.30 Ic (Kiyota);
01.83540, 11.6 (A. Pearce, Nedlands, WA, Australia);
01.876, 10.5 (K. Itagaki, Yamagata, Japan, via CBET 4720);
02.32569, <11.1 (C. Adib, Porto Alegre, Brazil);
02.39672, 11.673 V +/-0.016 (Hambsch);
02.39699, 11.666 V +/-0.017 (Hambsch);
02.39727, 9.662 I +/-0.033 (Hambsch);
02.39748, 9.685 I +/-0.035 (Hambsch);
02.39787, 12.926 B +/-0.039 (Hambsch);
02.39826, 12.855 B +/-0.041 (Hambsch);
02.83470, 11.7 (Pearce);
03.39734, 11.578 V +/-0.015 (Hambsch);
03.39762, 11.575 V +/-0.015 (Hambsch);
03.39790, 9.696 I +/-0.031 (Hambsch);
03.39811, 9.750 I +/-0.029 (Hambsch);
03.39851, 12.853 B +/-0.035 (Hambsch);
03.39889, 12.773 B +/-0.036 (Hambsch);
04.39804, 11.387 V +/-0.014 (Hambsch);
04.39831, 11.416 V +/-0.014 (Hambsch);
04.39859, 9.557 I +/-0.035 (Hambsch);
04.39880, 9.496 I +/-0.040 (Hambsch);
04.39920, 12.648 B +/-0.032 (Hambsch);
04.39958, 12.611 B +/-0.032 (Hambsch);

Charts: A sequence for V6566 Sgr is being prepared by the AAVSO Sequence Team. Once it is available, charts with comparison stars for the nova may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name V6566 SGR.

Notes:
a. Designated PNV J17561375-2942546 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Information in this Alert Notice is taken from IAU CBAT CBET 4720 (D. W. E. Green, ed.) except for observations not indicated as coming via CBET 4720.

b. E. Kazarovets reports that a red star (magnitudes B = 18.6, R = 16.6) is located at position end figures 13.781s, 57.68" (USNO-A2.0 0600-29573251).

c. E. Kazarovets reports the GCVS name V6566 Sgr has been assigned to N Sgr 2020.

d. Position end figures
- H. Kaneda (measured Yamamoto's image of 2020 January 30.8568 UT): 13.75s, 54.6"
- Sakurai (2020 Jan. 31.841 UT): 14.11s, 54.9"
- S. Kiyota (2020 Feb. 01.752 UT): 14.04s, 58.0"
- K. Itagaki (2020 Feb. 01.876 UT): 14.06s, 58.6"

e. Images
- S. Kiyota (2020 Feb. 01.752 UT): http://meineko.sakura.ne.jp/ccd/PNV_J17561375-2942546.jpg)
- K. Itagaki (2020 Feb. 01.876 UT): http://k-itagaki.jp/images/sgr-2020-1.jpg)

Congratulations to Minoru Yamamoto and Yukio Sakurai on their independent discoveries!

This Alert Notice was compiled by Elizabeth O. Waagen.




The Z CamPaign


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.



ACTIVITY AT A GLANCE

Last updated 16:53 UT on 23 February 2020

New outbursts and unusual activity reported in the last 72 hours

YYYYMMDD

20200223
ASASSN-17qh

20200222
GZ Cnc
NY Her
WX Hyi
SS UMi
TW Vul
NSV 2026
CRTS J082603.7+113821
CRTS J084127.4+210054

20200221
DT Aps
BF Ara
GZ Cnc
V485 Cen
AB Nor
HP Nor
DT Oct
BX Pup
CL Pup
V729 Sgr
V730 Sgr
VW Tuc
ASASSN-14dw
CRTS J124507.8-381322
MGAB-V299


...
20200201
HS 0218+3229 # (UGSS, spectroscopy and multiband photometry are encouraged)


Current superoutbursts (since ...)
V1024 Per (20200217, UGSU)
V528 Cam # (20200207, UGWZ, Psh= 0.0571(3) d, time-resolved photometry is required)
DDE 169 (20200207, UGSU, Psh= 0.07613(5) d)
AY Lyr (20200205, UGSU)
1RXS J003828.7+250920 (20200205, UGSU, eclipsing)
ASASSN-16le (20200204; UGSU, but not "new"; aka Gaia18awg and AT 2018asi, see also ATel #13468)
ASASSN-17qh (20200204, precursor outburst on 20200201)
QW Ser (20200202, UGSU)
HW Boo # (20200201, UGSU, Psh= 0.0622(10) dtime-resolved photometry is required)
ASASSN-16ni (20200131)
ASASSN-16og (20200131)
SDSS J091147.02+315101.8 (20200130, UGSU)
ASASSN-18cm (20200129)
TCP J06073081-0101501 # (20200127, UGWZ, time-resolved photometry is required)
ASASSN-14fe : (20200123; UGSU:, time-resolved photometry is urgently required)
MGAB-V1111 (20200121; UGSU:, precursor outburst 20200117)
RU Hor (20200120)
ASASSN-20av (20200118)


Z Cam-type dwarf novae at standstill
HL CMa (since 20191106 or earlier)
Z Cam (since 20181012)
V2837 Ori (20191106–20191123; IW And star, eclipsing, Porb= 0.2761069 d)
CK Eri (20190925–20191029, outburst 20191030; IW And star?)
RX And (20190614–20190714)
V507 Cyg (20190403–20190706, IW And star)
AT Cnc (20190212 – 20190603)
1RXS J062954.6-033520 (20190228–20190316)
UY Pup (20181129–20181217)


# 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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