NOVA SAGITTARII 2012 No. 4

PNV J18202726-2744263
 

Discovered by Koichi Nishiyama, Kurume,Japan and Fujio Kabashima, Miyaki,Japan at mag.= 7.8 in Sgr on two 40-s unfiltered CCD frames taken around 2012 Jul. 07.4986 UT ( limiting magnitude=13.7 ), using a 105-mm f/4 camera lens (+SBIG STL6303E camera).

Position (2000.0) :  R.A. = 18 20 27.26, Decl. = -27 44 26.3


 LISA spectrograph guiding camera (Atik314L+) - C11 telescope - 20 sec. exposure (22/07/2012)

July 8.962, 2012 observation

Setup: Takahashi FSQ106 refractor (0.106-m diameter) + LISA spectrograph (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 7.9 (source AAVSO)
Exposure: 3 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120708_962.fit

July 9.859, 2012 observation

Setup: Takahashi FSQ85ED refractor (0.085-m diameter) + LISA spectrograph (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 8.2 (source AAVSO)
Exposure: 9 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120709_859.fit


 



Comparison of 8.962 July and 9.850 July observations.

July 12.883, 2012 observation

Setup: Takahashi FSQ85ED refractor (0.085-m diameter) + LISA spectrograph - near infrared version (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 8.5 (source AAVSO)
Exposure: 7 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120712_883.fit

July 12.977, 2012 observation

Setup: Takahashi FSQ85ED refractor (0.085-m diameter) + LISA spectrograph (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892.

V mag. = nearly 8.5 (source AAVSO)
Exposure: 6 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120712_977.fit


 



Fusion of 12.883 observation (IR) and 12.977 observation (visible). Click here for download the merged spectrum: _nova_sgr2012_4_20120712_930_full.fit

July 14.860, 2012 observation

Setup: Takahashi FSQ85ED refractor (0.085-m diameter) + LISA spectrograph (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 8.8 (source AAVSO)
Exposure: 6 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120714_860.fit

July 14.932, 2012 observation

Setup: Takahashi FSQ85ED refractor (0.085-m diameter) + LISA spectrograph - near infrared version (sampling = 2.1 A/pixel - R = 1000 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 8.8 (source AAVSO)
Exposure: 12 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120714_932.fit


 


Comparison of 12.9 / 07 / 2012 and 14.9 / 07 / 2012 spectra of nova Sgr 2012 No 4.
Click here for download the merged spectrum: _nova_sgr2012_4_20120714_896_full.fit

July 16.908, 2012 observation

Setup: Takahashi FSQ106 refractor (0.106-m diameter) + eShel spectrograph (R = 11000) + QSI-532 CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Sky background not removed

V mag. = nearly 9.0 (source AAVSO)
Exposure: 16 x 600 seconds
Download the spectrum : _nova_sgr_2012_4_20120716_908_full.fit




Part of the echelle spectrum - Detail of Halpha line.

July 18.858, 2012 observation

Setup: Celestron 11 telescope (0.280-m diameter) + eShel spectrograph (R = 11000) + QSI-532 CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Sky background not removed

V mag. = nearly 9.1 (source AAVSO)
Exposure: 14 x 600 seconds
Download the spectrum : _nova_sgr_2012_4_20120718_858_full.fit


 

 
Detail of nova Sgr 2012 No. 4 spectrum and identification of principal atmospheric parasitic lines.
Hg and Na lines are from sky pollution (Castanet-Tolosan is a suburban observatoty). Auroral lines come from an intense solar activity at the time of observation.

July 22.941, 2012 observation

Setup: Celestron 11 telescope (0.280-m diameter) + LISA spectrograph (sampling = 2.1 A/pixel - R = 950 - 23 microns slit) + Atik314L+ CCD camera - Data reduction : ISIS
Observatory: Castanet Tolosan (France)
Observer: Christian Buil
Note: Atmospheric extinction and instrumental response are evaluated from observation of star HD175892. Sky background removed.

V mag. = nearly 9.5 (source AAVSO)
Exposure: 12 x 300 seconds
Download the spectrum : _nova_sgr_2012_4_20120722_941.fit

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