April 14, 2021
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/asassn-21fh-possible-nova-mag-104-scorpius-0
- Novae: https://www.aavso.org/asassn-21fh-possible-nova-mag-104-scorpius
Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!
Event: Nova in Scorpius: V1710 Sco = N Sco 2021 = ASASSN-21fh = PNV J17091000-3730500
Discovered independently by:
- All-Sky Automated Survey for Supernovae (ASAS-SN)
- Paul Camilleri (Katherine, Northern Territory, Australia)
Discovery magnitude:
- ASAS-SN: 11.13 g
- Camilleri: 9.5 unfiltered DSLR (using a Nikon D3200 DSLR 85mm F/2 Lens)
Discovery date:
- ASAS-SN: 2021 April 12.1675 UT
- Camilleri: 2021 April 12.7625 UT
Coordinates (2000.0): R.A. 17 09 08.11 Decl. -37 30 40.9 (from VSX page for V1710 Sco)
Spectra: Spectra indicating the object to be a Fe II nova early in outburst were obtained by V. Joshi et al. (ATel #14544) on 2021 Apr. 12.916 UT using the Mt. Abu Faint Object Spectrograph and Camera - Pathfinder (MFOSC-P) on the PRL 1.2m Telescope at Mt. Abu Observatory (Rajasthan, India).
A spectrum showing the object to be a nova was obtained by S. K. Sng (Singapore, AAVSO observer code SSEC); it will be made available for viewing/downloading via the AAVSO Spectroscopic Database (AVSpec).
Observing recommendations: Please observe V1710 Sco as it continues to evolve, with observations of all types (visual, CCD, DSLR, PEP, spectroscopy) and multiple bands as instrumentation permits. Dr. Fred Walter (Stony Brook University) recommends observations every few hours in the early stages if the nova continues to brighten. Frequency of observation once past peak depends on the rate of decline, but should be a minimum of one observation per night per band. For spectroscopy, he recommends spectra in blue to observe He II 4686, H-beta, and the Bowen blend (4640A), in addition to H-alpha, with a cadence of one spectrum per clear night.
Observations reported to the AAVSO:
2021 Apr. 09.72014 UT, <11.0 (A. Pearce, Nedlands, W. Australia);
11.395, <16.76 g (ASAS-SN, via P. Schmeer, Saarbrücken-Bischmisheim, Germany);
11.682, <13.8 unfiltered (R. McNaught, Coonabarabran, NSW, Australia, via CBET 4955);
11.7583, <12 DSLR (P. Camilleri, Katherine, Northern Territory, Australia);
11.794, <13.5 unfiltered (McNaught, via CBET 4955);
12.168, 11.13 g (ASAS-SN, discovery image, via Schmeer);
12.408, 10.36 g (ASAS-SN, via Schmeer);
12.55, 9.5 TG (R. Kaufman, Bright, Victoria, Australia, via CBET 4955);
12.583, 9.6 unfiltered (McNaught, via CBET 4955);
12.687, 9.5 unfiltered (McNaught, via CBET 4955);
12.7625, 9.5 DSLR (Camilleri, discovery image);
12.796, 9.4 unfiltered (McNaught, via CBET 4955);
12.81390, 10.635 B +/-0.002 (R. Fidrich, Budapest, Hungary, using 0.50m f/6.8 reflector + FLI-PL6303E CCD camera at Siding Spring, Australia (T30, iTelescope.NET));
12.95500, 8.032 R +/-0.002 (V. Agnihotri, Kota, Rajasthan, India);
12.96500, 7.093 I +/-0.001 (Agnihotri);
12.97200, 8.841 V +/-0.001 (Agnihotri);
13.04120, 8.901 TG +/-0.012 (D. Blane, Henley-on-Klip, S. Africa);
13.06806, 8.8 (A. Amorim, Florianopolis, Brazil);
13.09169, 7.8281 R +/-0.0089 (V. Buso, Rosario, Argentina);
13.09297, 10.3440 B +/-0.0209 (Buso);
13.09342, 8.7688 V +/-0.0124 (Buso);
13.10288, 8.899 V +/-0.036 (J. Sanchez, Rosario, Argentina);
13.10623, 7.0029 I +/-0.0120 (Buso);
13.11111, 8.7 (Amorim);
13.12, 8.9 unfiltered CCD (F. Kugel, Banon, France, via CBET 4955);
13.12847, 8.9 (L. Araujo, Pelotas, Brazil);
13.18749, 8.807 V +/-0.03 (Sanchez);
13.22880, 7.6608 R +/-0.0076 (Buso);
13.22887, 6.8221 I +/-0.0109 (Buso);
13.22919, 8.5845 V +/-0.0104 (Buso);
13.22959, 10.1197 B +/-0.0160 (Buso);
13.34167, 8.7 (Amorim);
13.37150, 9.708 B +/-0.027 (J. Backman, Lappeenranta, Finland);
13.40052, 7.882 TR +/-0.050 (Backman);
13.40100, 8.914 TG +/-0.045 (Backman);
13.42201, 10.051 B +/-0.007 (J.-F. Hambsch, Mol, Belgium);
13.42256, 10.100 B +/-0.017 (Hambsch);
13.42306, 6.743 I +/-0.015 (Hambsch);
13.42333, 6.926 I +/-0.014 (Hambsch);
13.42369, 8.693 V +/-0.006 (Hambsch);
13.42409, 8.591 V +/-0.013 (Hambsch);
13.63211, 8.526 V +/-0.014 (A. Pearce, Nedlands, W. Australia, using 0.43m f/6.8 reflector + CCD at Siding Spring, Australia);
13.63291, 10.325 B +/-0.004 (Pearce);
13.63387, 6.575 I +/-0.007 (Pearce);
13.65600, 8.8 (N. Brown, Yanchep, W. Australia);
13.70139, 8.5 (Camilleri);
13.71528, 8.8 (C. Wyatt, Walcha, NSW, Australia);
13.73264, 8.8 (Pearce);
13.78464, 8.63 TG +/-0.05 (F. Romanov, Yuzhno-Morskoy, Nakhodka, Russia);
13.78683, 8.53 TG +/-0.05 (Romanov);
13.79167, 9.0 (Romanov);
14.08194, 9.0 (P. Reis-Fernandes, Brasilia, Brazil);
14.16224, 8.928 V +/-0.129 (Sanchez);
Charts: Charts with comparison stars for V1710 Sco may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations using the name V1710 SCO.
- Submit optical observations to the AAVSO International Database using WebObs (see below)
- Submit spectra to the AAVSO Spectroscopy Database (AVSpec)
Notes:
a. Designated PNV J17091000-3730500 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Some information in this Alert Notice is taken from IAU CBAT Central Bureau Electronic Telegram 4955 (D. W. E. Green, Ed).
b. P. Camilleri notes that the nova has an orange color on the DSLR discovery images.
c. E. Kazarovets reports that N Sco 2021 has been assigned the permanent GCVS name V1710 Sco (via CBET 4955).
d. Position end figures:
- ASAS-SN (2021 Apr. 12.168 UT): 08.11s,40.4"
- P. Camilleri (2021 Apr. 12.7625 UT): 50s, 50”
- R. Fidrich (2021 Apr. 12.8139 UT): 08.11s, 40.9"
- F. Kugel (2021 Apr. 13.12 UT): 08.32s, 42.6"
- A. Pearce (2021 Apr. 13.632 UT): 08.10s, 40.9"
e. Images:
- R. Kaufman (2021 Apr. 12.55 UT): http://tinyurl.com/4t5akzyy
- R. Fidrich (2021 Apr. 12.8139 UT): http://vendegcsillagkereso.blogspot.com/2021/04/asassn-21fh-fenyes-nova-skorpioban.html
- F. Romanov (2021 Apr. 13.787 UT): https://www.flickr.com/photos/filipp-romanov/51114244018
Congratulations to the ASAS-SN team and to Paul Camilleri on their independent discoveries!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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