Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J17091000-3730500

PNV J17091000-3730500   2021 04 12.7625*  17 09 10.00 -37 30 50.0   9.5 U             SCO       0 0

2021 04 12.7625

17h 09m 50s -37d 30’ 50” (2000) Mag 9.5 2021 April 11.7583UT mag (12 = Object not visible on 3 images to a limit of mag 12. 2021 April 12.7625UT mag 9.5 = Object visible on 3 images taken with a Nikon D3200 DSLR 85mm F/2 Lens 5 sec Exp Object has an orange colour on the DSLR images. Paul Camilleri Katherine Northern Territory Australia

2021 04 12.1675

This possible nova had already been discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) and reported as ASASSN-21fh, see https://www.wis-tns.org/object/2021jiu —— The most recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) observations are 2021 April 11.395 UT, fainter than gmag. 16.76; 12.168, gmag. 11.13; 12.408, gmag. 10.36; complete data and light curve at https://asas-sn.osu.edu/sky-patrol/coordinate/f9c61af9-11cb-4857-9663-35c8b21633b9 —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2021 04 12.8139

Photometry result was B=10,635. Position end figures 08s.11, 40".9 measured with a 0.50m f/6.8 reflector + FLI-PL6303E CCD camera at Siding Spring, Australia (T30, iTelescope.NET). Unfortunately the 10s V-band images were already saturated, but visual inspection of the images showed the nova candidate slightly brighter than 9.0 magnitudes. Thus B-V seems to be at least 1.5 magnitudes. The variable is indeed very red. Photo: http://vendegcsillagkereso.blogspot.com/2021/04/asassn-21fh-fenyes-nova-skorpioban.html Robert Fidrich (Budapest, Hungary)

2021 04 12.55

Object visible at mag 9.5 (green channel of DSLR image, ~V) in 5 images taken with Canon 800D and 200mm lens. Observer Rob Kaufman, Bright, Victoria, Australia. Image here: tinyurl.com/4t5akzyy

2021 04 13.12

mag 8.9U; 17 09 08.32 -37 30 42.6 focal length 195 mm f/2.8 lens + CCD sbigST8300. Median stack = 3x30s. Observer F. Kugel, Banon 04, France.

2021 04 11.682

Follow up observations: Nova suspect not visible to a limiting magnitude of 13.8 on image taken on Apr. 11.682 UT and limiting magnitude 13.5 on Apr. 11.794 UT all unfiltered, using Canon 6D camera, focal length 135-mm, f/2.8 (59s exposures). Further positive observation on Apr. 12.583 UT at magnitude 9.6, Apr. 12.687 UT at magnitude 9.5 and Apr. 12.796 UT at magnitude 9.4 (unfiltered). Rob McNaught (Coonabarabran, NSW, Australia).

2021 04 13.632

Position end figures 08s.10, 40".9 measured with 0.43m f/6.8 reflector + CCD at Siding Spring, Australia. J2000, Gaia DR2 positions. Photometry as follows: Apr. 13.632 UT V = 8.53, Apr. 13.633 UT B = 10.32 & Apr. 13.634 UT I = 6.58. Visual magnitude estimate 8.8 on Apr. 13.732 UT Andrew Pearce, Nedlands, W.Australia

2021 04 13.78683

Follow-up observation: 2021 Apr. 13.78683 (JD 2459318.28683) UT. Mag.= 8.53 TG +/-0.05 using Canon EOS 60D camera, focal length 135-mm, f/5.6 (stacked 5x5 sec., ISO-6400). Haze. Filipp Romanov (Yuzhno-Morskoy, Nakhodka, Russia). My photo (stacked 115x5 sec.): https://www.flickr.com/photos/filipp-romanov/51114244018