Photometry of Dwarf Nova in Gemini TCP J07094936+1412280 29

2022-01-04T20:54:18+00:003 January 2022|News, Nova, Other|

Still learning here but more consistent now with reprocessed data. Using AAVSO chart X27541GQ, comparison star 127, V mag. 12.701.

250mm f4.8 Newtonian
QHY168C @-15°C // Green channel only

29-12-2021 21:55 UT // TG mag. 12.48 // 540s
31-12-2021 23:31 UT // TG mag. 12.90 // 90s
01-01-2022 21:58 UT // TG mag. 13.29 // 90s
03-01-2022 21:58 UT // TG mag. 13.68 // 150s
04-01-2022 20:42 UT // TG mag. 13.88 // 150s

AAVSO X27541GQ data

Dwarf Nova in Gemini TCP J07094936+1412280 2022-01-01

2022-01-01T22:53:18+00:001 January 2022|News, Nova, Other|

Better conditions for photometry. V mag 13.29

31-Dec-2021 poor conditions, no image, gave 13.1

Main image is full colour (enhanced) but photometry using green channel only

Object IDTCP J07094936+1412280
Details01-01-2022 21:58:55 UT
Telescope250mm f4.8 Newtonian
MPCC
CameraQHY168C @-15°C
IDAS D2
Exposure(s)3x30s
darks, flats, bias
CaptureNINA
ProcessingPre-processed, stacked and channels separated in Siril
Photometry in AstroImageJ
Composition in Photoshop

Dwarf Nova in Gemini TCP J07094936+1412280

2021-12-31T18:41:42+00:0031 December 2021|News, Nova, Other|

Reported on 28 Dec 2021
britastro.org/node/26461
TCP J07094936+1412280
Photometry using AstroImageJ gave me on V mag of 12.3. Comparison stars may not be the best.

Main image is full colour (enhanced) but photometry using green channel only

Object IDTCP J07094936+1412280
Details29-12-2021 21:55 UT
Telescope250mm f4.8 Newtonian
MPCC
CameraQHY168C @-15°C
IDAS D2
Exposure(s)3x180s
darks, flats, bias
CaptureNINA
ProcessingPre-processed, stacked and channels separated in Siril
Photometry in AstroImageJ
Composition in Photoshop

Nova Delphinus 2013

2021-12-31T14:06:21+00:0031 August 2013|News, Nova, Other|

Mag 6+?
2013-08-30 21:28 UT
200mm f5 newtonian, unguided
4×30s ISO 800, darks
Canon EOS 350D modded, Astronomik CLS
Captured in APT, Processed in Nebulosity, PS CS5

Discovered 14 Aug 2013 by Koichi Itagaki of Yamagata, peaked at mag. 4.5.
It’s about 13,000 light years away. Was originally quite blue but is now much redder – this is what sometimes happens as novae evolve.

From Sky & Telescope

The nova was discovered by Koichi Itagaki of Yamagata, Japan, in an image taken at 14hhUniversal Time (2 p.m. EDT) on August 14th. It was not present in a photo that he took the previous day. Here is the announcement from the IAU’s Central Bureau for Astronomical Telegrams. The star was apparently 17th magnitude before erupting, so it brightened roughly 100,000-fold to its peak on August 16th.

A classical nova happens in a special kind of tightly-orbiting binary star system: one where a relatively normal star pours a stream of hydrogen onto the surface of a companion white dwarf. When the layer of fresh hydrogen on the white dwarf’s surface grows thick and dense enough, the bottom of the layer explodes in a runaway hydrogen-fusion reaction — a hydrogen bomb in the shape of a thin shell roughly the size of Earth. The underlying white dwarf remains intact, and as new hydrogen builds up, the process may repeat in a few years to tens of thousands of years.