NGC 7331 or Caldwell 30. Galaxy with a recent super nova that was still visible on September 8th, 2026. The Supernova is just below the galaxy core in this image. The Supernova was first observed mid July, so by September it has faded quite a bit.
Also visible is Stephen’s Quintet galaxy cluster in the lower right. Image taken with Celestron XLT 150, Coma Corrector, ASI2600MM with LRGB filters on an AM5 mount.
Have a previous image of NGC 7331 from September of 2023: https://nielsennotes.com/2023/08/20/deer-lick-cluster-ngc7331-and-stephens-quintet-ngc7320-others/
Below is a zoomed in view to see the Supernova:
BITPIX = -32 / number of bits per data pixel
NAXIS = 3 / number of data axes
NAXIS1 = 3748 / length of data axis 1
NAXIS2 = 2811 / length of data axis 2
NAXIS3 = 3 / length of data axis 3
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in ‘Astronomy
COMMENT and Astrophysics’, volume 376, page 359; bibcode: 2001A&A…376..359H
BZERO = 0. / Offset data range to that of unsigned short
BSCALE = 1. / Default scaling factor
PROGRAM = ‘Siril 1.4.4’ / Software that created this HDU
FILENAME= ‘2026-09-08_21-37-03_Rd_-10.00_180.00s_0003.fits’
DATE = ‘2026-09-09T22:59:09’ / UTC date that FITS file was created
DATE-OBS= ‘2026-09-09T02:15:14.158000’ / YYYY-MM-DDThh:mm:ss observation start,
IMAGETYP= ‘LIGHT ‘ / Type of image
ROWORDER= ‘BOTTOM-UP’ / Order of the rows in image array
EXPTIME = 180. / [s] Exposure time duration
TELESCOP= ‘Celestron XLT 150’ / Telescope used to acquire this image
FILTER = ‘mixed ‘ / Active filter name
FOCALLEN= 713.285 / [mm] Focal length
CENTALT = 54.3033333333333 / [deg] Altitude of telescope
CENTAZ = 93.2519444444444 / [deg] Azimuth of telescope
XBINNING= 1 / Camera binning mode
YBINNING= 1 / Camera binning mode
XPIXSZ = 3.75999999046326 / [um] Pixel X axis size
YPIXSZ = 3.75999999046326 / [um] Pixel Y axis size
INSTRUME= ‘ZWO ASI2600MM Pro’ / Instrument name
CCD-TEMP= -10. / [degC] CCD temperature
SET-TEMP= -10. / [degC] CCD temperature setpoint
GAIN = 101 / Sensor gain
OFFSET = 70 / Sensor gain offset
CVF = 0.240082889795303 / [e-/ADU] Electrons per A/D unit
FOCNAME = ‘ZWO Focuser (1)’ / Focusing equipment name
FOCPOS = 1890 / [step] Focuser position
FOCUSSZ = 0 / [um] Focuser step size
FOCTEMP = 27.7600002288818 / [degC] Focuser temperature
STACKCNT= 31 / Stack frames
LIVETIME= 5580. / [s] Exposure time after deadtime correction
EXPSTART= 2461292.58262017 / [JD] Exposure start time (standard Julian date)
EXPEND = 2461292.72884926 / [JD] Exposure end time (standard Julian date)
OBJECT = ‘Caldwell 30’ / Name of the object of interest
AIRMASS = 1.23067175106063 / Airmass at frame center (Gueymard 1993)
SITELAT = 46.4630555555556 / [deg] Observation site latitude
SITELONG= -93.535 / [deg] Observation site longitude
SITEELEV= 300. / [m] Observation site elevation
OBJCTRA = ’22 36 47.352′ / [H M S] Image center Right Ascension
OBJCTDEC= ‘+34 17 10.402’ / [D M S] Image center Declination
RA = 339.197299114262 / [deg] Image center Right Ascension
DEC = 34.2862228292128 / [deg] Image center Declination
CTYPE1 = ‘RA—TAN-SIP’ / TAN (gnomic) projection + SIP distortions
CTYPE2 = ‘DEC–TAN-SIP’ / TAN (gnomic) projection + SIP distortions
CUNIT1 = ‘deg ‘ / Unit of coordinates
CUNIT2 = ‘deg ‘ / Unit of coordinates
EQUINOX = 2000. / Equatorial equinox
CRPIX1 = 1649. / Axis1 reference pixel
CRPIX2 = 1397.5 / Axis2 reference pixel
CRVAL1 = 339.257997282594 / [deg] Axis1 reference value
CRVAL2 = 34.3323693581151 / [deg] Axis2 reference value
LONPOLE = 180. / Native longitude of celestial pole
CDELT1 = -0.000302043710323381 / [deg] X pixel size
CDELT2 = 0.00030201238664519 / [deg] Y pixel size
PC1_1 = 0.709838812964528 / Linear transformation matrix (1, 1)
PC1_2 = 0.704364152700228 / Linear transformation matrix (1, 2)
PC2_1 = -0.704189159376949 / Linear transformation matrix (2, 1)
PC2_2 = 0.710012413846396 / Linear transformation matrix (2, 2)
A_ORDER = 3 / SIP polynomial degree, axis 1, pixel-to-sky
A_0_0 = 0.
A_1_0 = 0.
A_0_1 = 0.
A_2_0 = -2.7208490017803E-07
A_1_1 = -3.19299612510796E-08
A_0_2 = -9.8317710752354E-08
A_3_0 = -6.03596244238502E-10
A_2_1 = -4.36174893614628E-12
A_1_2 = -6.04574969378408E-10
A_0_3 = -1.47367978041488E-11
B_ORDER = 3 / SIP polynomial degree, axis 2, pixel-to-sky
B_0_0 = 0.
B_1_0 = 0.
B_0_1 = 0.
B_2_0 = -5.28316895949776E-08
B_1_1 = -1.99084954624273E-07
B_0_2 = -7.73687813052879E-08
B_3_0 = -5.96294520493931E-12
B_2_1 = -6.01182781310738E-10
B_1_2 = -3.27984971099407E-12
B_0_3 = -6.08752473731785E-10
AP_ORDER= 3 / SIP polynomial degree, axis 1, sky-to-pixel
AP_0_0 = -0.0096798181992603
AP_1_0 = -5.61034295644136E-05
AP_0_1 = -3.38727426044869E-07
AP_2_0 = 2.80958880256036E-07
AP_1_1 = 3.34527314688171E-08
AP_0_2 = 1.01293651923428E-07
AP_3_0 = 6.20789879205101E-10
AP_2_1 = 4.70457980514831E-12
AP_1_2 = 6.24346441313052E-10
AP_0_3 = 1.49925413349655E-11
BP_ORDER= 3 / SIP polynomial degree, axis 2, sky-to-pixel
BP_0_0 = -0.00306985543070806
BP_1_0 = -2.62874586897804E-08
BP_0_1 = -3.92751843423245E-05
BP_2_0 = 5.43127217566999E-08
BP_1_1 = 2.03681946027906E-07
BP_0_2 = 7.93005295604693E-08
BP_3_0 = 6.16918387941802E-12
BP_2_1 = 6.18146586153237E-10
BP_1_2 = 3.30274432670733E-12
BP_0_3 = 6.22174846224709E-10
PLTSOLVD= T / Siril internal solver
HISTORY Crop (x=1463, y=633, w=3748, h=2811)
DATE-LOC= ‘2026-09-08T21:37:03.359’ / Time of observation (local)
DATE-AVG= ‘2026-09-09T02:38:33.624’ / Averaged midpoint time (UTC)
CAMERAID= ‘ZWO ASI2600MM Pro’ / Imaging instrument identifier
USBLIMIT= 40 / Camera-specific USB setting
FOCRATIO= 4.75 / Focal ratio
PIERSIDE= ‘West’ / Telescope pointing state
FWHEEL = ‘EFW’ / Filter Wheel name
OBJCTROT= 315.0 / [deg] planned rotation of imaged object
ROTNAME = ‘ZWO CAA’ / Rotator equipment name
ROTATOR = 346.470001220703 / [deg] Mechanical rotator angle
ROTATANG= 346.470001220703 / [deg] Mechanical rotator angle
ROTSTPSZ= 0.0 / [deg] Rotator step size
BG-EXTR = ‘GraXpert’
CBG-1 = 0.0017920921
CBG-2 = 0.0017920921
CBG-3 = 0.0017920921
INTP-OPT= ‘RBF ‘
HIERARCH SMOOTHING = 0.0
HIERARCH CORR-TYPE = ‘Subtraction’
HIERARCH SAMPLE-SIZE = 25
HIERARCH RBF-KERNEL = ‘thin_plate’
HIERARCH SPLINE-ORDER = 3
BG-PTS = ‘[[287, 188, 1], [911, 238, 1], [1535, 238, 1], [2209, 188, 1], &’
CONTINUE ‘[2833, 188, 1], [3457, 188, 1], [4031, 238, 1], [4655, 188, 1], &’
CONTINUE ‘[5279, 238, 1], [5903, 188, 1], [337, 862, 1], [961, 812, 1], &’
CONTINUE ‘[1585, 812, 1], [2159, 862, 1], [2783, 812, 1], [3407, 812, 1], &’
CONTINUE ‘[4031, 812, 1], [4655, 862, 1], [5279, 862, 1], [5953, 812, 1], &’
CONTINUE ‘[337, 1436, 1], [961, 1436, 1], [1535, 1436, 1], [2159, 1486, 1], &’
CONTINUE ‘[2783, 1486, 1], [3432, 1461, 1], [4031, 1486, 1], [4705, 1436, &’
CONTINUE ‘1], [5329, 1486, 1], [5903, 1486, 1], [287, 2110, 1], [961, 2110, &’
CONTINUE ‘1], [1585, 2060, 1], [2159, 2060, 1], [2783, 2060, 1], [3407, &’
CONTINUE ‘2060, 1], [4031, 2060, 1], [4655, 2060, 1], [5279, 2110, 1], &’
CONTINUE ‘[5928, 2085, 1], [287, 2734, 1], [961, 2734, 1], [1535, 2734, 1], &’
CONTINUE ‘[2209, 2684, 1], [2833, 2734, 1], [3457, 2684, 1], [4056, 2709, &’
CONTINUE ‘1], [4680, 2709, 1], [5329, 2684, 1], [5903, 2684, 1], [287, 3358, &’
CONTINUE ‘1], [911, 3358, 1], [1535, 3308, 1], [2184, 3333, 1], [2783, 3358, &’
CONTINUE ‘1], [3407, 3308, 1], [4081, 3358, 1], [4655, 3358, 1], [5304, &’
CONTINUE ‘3333, 1], [5928, 3333, 1], [337, 3982, 1], [961, 3932, 1], [1585, &’
CONTINUE ‘3982, 1], [2184, 3957, 1], [2783, 3982, 1], [3457, 3982, 1], &’
CONTINUE ‘[4081, 3932, 1], [4705, 3932, 1], [5279, 3982, 1], [5903, 3982, &’
CONTINUE ‘1], [3144.7188533627345, 2702.659316427784, 1.0]]’
END