SN 2023ixf is a bright supernova in the Pinwheel galaxy M 101 in constellation UMa. With actual brightness of V~11.0 mag (end of May 2023) it is easily reachable whithin the Alpy600 spectrograph.
It needs good weather conditions for sprctra recording. At start time of the spectroscopy session the object had an altitude of 77°, at the end it was at 54° a really comfortable position.
2023-05-26: I took the first spectrum starting at 22:21 UT with the following conditions: mostly clear sky, moon (34%) at the beginning in 18° altitude, later below horizon, low humidity, average seeing, wind: light air, temperature: 15° C
2023-06-03: Second recording of a spectrum starting at 22:30 UT under very good conditions: clear sky, no moon, low humidity, good seeing, wind: calm, temperature: 15° C
2023-06-09: Third recording of a spectrum starting at 22:47 UT under very good conditions: clear sky, no moon, low humidity, good seeing, wind: calm, temperature: 16° C
2023-05-21 22:09 - 22:26 UT, Roof Observatory Kaufering, 14" ACF teleskop on Taurus GM-60 mount, CCD camera: Moravian G2-8300FW, 3x3 Binning, L-filter, 42x60s; magnitude measured with Astrometrica: V=11.5 mag;
See SN 2023ixf at Latest Supernovae page for more information and images.
Spectra of this supernova:
2023-05-26 22:21 - 00:25 UT, Roof Observatory Kaufering,
Meade 14" ACF telescope on Taurus GM-60 mount, Astro Physics reducer CCDT67,
Alpy600 with guiding unit, CCD camera: Atik 428EX, guiding camera: ASI 120 MM; recording software: AstroArt, guiding software: PHD2
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs,
instrumental response calibration: with reference star HIP 67848 (HD 121489), A0V, data reduction: with
Integrated Spectrographic Innovative Software from Christian Buil;
The spectrum has been cut at the near UV end (3710 Å) due to strong noise.
2023-06-03 22:30 - 00:47 UT, Roof Observatory Kaufering,
Meade 14" ACF telescope on Taurus GM-60 mount, Astro Physics reducer CCDT67,
Alpy600 with guiding unit, CCD camera: Atik 428EX, guiding camera: ASI 120 MM; recording software: AstroArt, guiding software: PHD2
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs,
instrumental response calibration: with reference star HIP 67848 (HD 121489), A0V, data reduction: with
Integrated Spectrographic Innovative Software from Christian Buil;
The spectrum has been cut at the near UV end (3750 Å) due to strong noise.
2023-06-09 22:47 - 01:09 UT, Roof Observatory Kaufering,
Meade 14" ACF telescope on Taurus GM-60 mount, Astro Physics reducer CCDT67,
Alpy600 with guiding unit, CCD camera: Atik 428EX, guiding camera: ASI 120 MM; recording software: AstroArt, guiding software: PHD2
Wavelength calibration: Hg lines from energy saving lamp and Ne lines from flicker flame light bulbs,
instrumental response calibration: with reference star HIP 67848 (HD 121489), A0V, data reduction: with
Integrated Spectrographic Innovative Software from Christian Buil;
The spectrum has been cut at the near UV end (3710 Å) due to strong noise.
The classification with two independent methods shows a type II.
1) Classification with GELATO
(Padova-Asiago Supernova Group), see [1].
Spectrum from 2023-05-26 second best matches to SN 2008es (IIL pec) with an age of 12.5 d (Quality factor: 0.88)
Spectrum from 2023-06-03 second best matches to SN 2008es (IIL pec) with an age of 50.0 d (Quality factor: 1.13); the age is definitly wrong!
Spectrum from 2023-06-09 best matches to SN 2007od (IIP) with an age of 6.4 d (Quality factor: 1.65); the age is too young.
2) Classification with SNID
(SuperNova IDentification), see [2].
Spectrum from 2023-05-26 best matches to SN 2004et (IIP) with an age of -2 d
Assuming an age of -2 d, the maximum brightness must have been two days later, around May 29th 2023, 00:00 UT (probably three days too late).
Spectrum from 2023-06-03 11th match to SN 1979C (IIL) with an age of 13 d - visually the best match.
The given age of 13 d is probably 5 days too late.
Spectrum from 2023-06-09 11th match to SN 2006Y (IIP) with an age of 27 d - visually the best match.
The given age of 27 d is probably 15 days too late.
In both tools the red shift (z=0.000804) of host galaxy has been entered.
Note: The age in GELATO is given in days since explosion, wheras the age in SNID is given in days since maximum brightness.
