Monitored source ASASSN-26fc - Possible Galactic Nova

Position: 17:52:06.799 -23:43:20.71 · cameras: TTUQ1b1x1 TTUQ2b1x1 · 16 detections, 251 upper limits · 8 excluded from the lightcurve

Date range: 2026-02-22.48774 .. 2026-09-18.06653 (UTC) · JD 2461093.98774 .. 2461301.56653

Lightcurve - last 30 days

Lightcurve - full time range

Data files: lightcurve.dat (JD mag err camera field) · upperlimits.dat (JD limit_mag camera field) · lightcurve_aavso.txt (AAVSO Extended Format incl. fainter-than records)

Why these photometric measurements are not very precise

Photometric measurements obtained with a wide-field camera are not very precise, for a number of reasons:

Bad plate solution: errors in the astrometric calibration result in misplacement of the photometric aperture. This may create outlier measurements.
Undersampled PSF: star images occupy only a few pixels, so any uncorrected pixel-to-pixel and intra-pixel sensitivity variations affect the measurements more than they would for well-sampled telescopic images in which each star is spread across many pixels.
Low observing altitude: the fields are often imaged only 15-20 degrees above the horizon. This is a deliberate trade-off for an all-sky transient search, as the sky area at low elevation is far larger than the area near the zenith, but it is bad for photometric accuracy. An airmass-dependent magnitude zero-point correction is applied, but it is not perfect.
Color-dependent (second-order) extinction: a star's brightness measured relative to the comparison stars in the field is elevation-dependent if the star's color differs from the average color of the comparison stars.
Blending with nearby stars in crowded fields affects the measurements differently depending on the aperture size, which is adjusted for each image individually based on the seeing and focus quality.
Position-dependent PSF: the same star may fall closer to the image center in one field and farther from it in another, so a different fraction of its PSF is covered by the aperture even when the same aperture is used to measure both images. Field-to-field and camera-to-camera calibration is therefore an issue, and its magnitude differs from source to source.
Chromatic aberration: many wide-field lenses suffer from it, leaving extremely red stars out of focus while the focus is optimal for average-colored stars.
Clouds, if present, dramatically degrade the quality of the photometry across the entire image.

In practice, expect a photometric uncertainty of ~0.1 mag, or somewhat better in favorable conditions.

The intended use of these data is a quick check of the current state of a source (flaring or quiescent) - not precise photometry.

The photometric measurements are performed without a filter; the zero-point of the instrumental magnitude scale is set by the V magnitudes of the field stars. You are welcome to use these data in any way you see fit, providing a link to this page as the origin of the data.

Photometry table (newest measurements first)

Date (UTC) JD(UTC) mag err status camera image 2026-09-18.06653 2461301.56652878 12.8415 0.0847 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-17_20-35-38_20.00sec_-0.00C_LIGHT_0003.fits 2026-09-18.06600 2461301.56600383 12.8331 0.0843 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-17_20-34-52_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-18.06572 2461301.56571869 12.8673 0.0937 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-17_20-34-28_20.00sec_-0.00C_LIGHT_0002.fits 2026-09-18.06537 2461301.56537154 12.9800 0.1045 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-17_20-33-58_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-15.06922 2461298.56921809 12.3418 0.0555 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-14_20-39-30_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-15.06837 2461298.56837075 12.4350 0.0629 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-14_20-38-17_20.00sec_0.00C_LIGHTs_0000.fits 2026-09-12.07175 2461295.57175446 11.6623 0.0297 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-11_20-43-09_20.00sec_0.00C_LIGHTs_0001.fits 2026-09-12.07125 2461295.57125272 11.5958 0.0280 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-11_20-42-26_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-10.07636 2461293.57636122 10.2975 0.0071 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-09_20-49-47_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-10.07571 2461293.57571483 10.2647 0.0071 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-09_20-48-51_20.00sec_-0.00C_LIGHT_0004.fits 2026-09-10.07359 2461293.57358951 9.9743 0.0098 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-09_20-45-48_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-10.07299 2461293.57298874 9.9576 0.0099 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-09_20-44-56_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-08.07756 2461291.57756061 13.5442 0.2041 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-07_20-51-31_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-08.07708 2461291.57707530 13.6064 0.2237 detection TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-07_20-50-49_20.00sec_0.00C_LIGHT_0004.fits 2026-09-08.07549 2461291.57549027 12.8655 0.1590 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-07_20-48-32_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-08.07495 2461291.57494519 13.1455 0.2118 detection TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-07_20-47-45_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-07.07641 2461290.57640660 13.9126 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-06_20-49-51_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-07.07588 2461290.57588181 13.8657 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-06_20-49-06_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-06.08412 2461289.58412404 14.7451 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-05_21-00-58_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-06.08366 2461289.58365973 14.7060 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-05_21-00-18_20.00sec_-0.00C_LIGHT_0004.fits 2026-09-06.08175 2461289.58174669 14.3078 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-05_20-57-32_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-06.08124 2461289.58123545 14.3148 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-05_20-56-48_20.00sec_0.00C_LIGHTs_0000.fits 2026-09-03.09430 2461286.59430266 14.6051 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-02_21-15-37_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-03.09355 2461286.59355391 14.6434 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-02_21-14-33_20.00sec_-0.00C_LIGHT_0004.fits 2026-09-03.09144 2461286.59144051 14.3189 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-02_21-11-30_20.00sec_-0.00C_LIGHTs_0001.fits 2026-09-03.09062 2461286.59061932 14.2840 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-09-02_21-10-19_20.00sec_-0.00C_LIGHTs_0000.fits 2026-09-01.08464 2461284.58464250 14.1898 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-31_21-01-43_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-01.08410 2461284.58410426 14.2073 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-31_21-00-56_20.00sec_-0.00C_LIGHT_0004.fits 2026-09-01.08232 2461284.58231866 13.8274 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-31_20-58-22_20.00sec_0.00C_LIGHTs_0001.fits 2026-09-01.08168 2461284.58168149 13.7703 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-31_20-57-27_20.00sec_-0.00C_LIGHTs_0000.fits 2026-08-31.08556 2461283.58556388 14.3038 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-30_21-03-02_20.00sec_-0.00C_LIGHT_0005.fits 2026-08-31.08495 2461283.58494824 14.2741 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-30_21-02-09_20.00sec_-0.00C_LIGHT_0004.fits 2026-08-31.08486 2461283.58486380 14.1508 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-30_21-02-02_20.00sec_0.00C_LIGHTs_0003.fits 2026-08-31.08431 2461283.58431001 14.0961 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-30_21-01-14_20.00sec_-0.00C_LIGHTs_0002.fits 2026-08-30.08744 2461282.58744330 14.2317 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-29_21-05-45_20.00sec_0.00C_LIGHT_0005.fits 2026-08-30.08693 2461282.58693330 14.2439 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-29_21-05-01_20.00sec_-0.00C_LIGHT_0004.fits 2026-08-30.08513 2461282.58512699 13.9693 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-29_21-02-24_20.00sec_0.00C_LIGHTs_0003.fits 2026-08-30.08463 2461282.58462853 13.9518 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-29_21-01-41_20.00sec_-0.00C_LIGHTs_0002.fits 2026-08-29.08973 2461281.58973449 14.3352 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-28_21-09-03_20.00sec_-0.00C_LIGHT_0007.fits 2026-08-29.08927 2461281.58926844 14.3540 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-28_21-08-22_20.00sec_-0.00C_LIGHT_0006.fits 2026-08-29.08855 2461281.58855108 14.2631 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-28_21-07-20_20.00sec_-0.00C_LIGHTs_0005.fits 2026-08-29.08774 2461281.58773917 14.1699 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-28_21-06-10_20.00sec_-0.00C_LIGHTs_0004.fits 2026-08-28.14631 2461280.64631081 14.4539 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-27_22-30-31_20.00sec_0.00C_LIGHT_0001.fits 2026-08-28.14577 2461280.64577116 14.3070 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-27_22-29-44_20.00sec_-0.00C_LIGHT_0000.fits 2026-08-25.11115 2461277.61114890 14.1833 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-24_21-39-53_20.00sec_-0.00C_LIGHT_0005.fits 2026-08-25.11045 2461277.61045311 14.2626 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-24_21-38-53_20.00sec_-0.00C_LIGHT_0004.fits 2026-08-25.10851 2461277.60850831 14.0183 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-24_21-36-05_20.00sec_-0.00C_LIGHTs_0001.fits 2026-08-25.10794 2461277.60794471 14.0059 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-24_21-35-16_20.00sec_-0.00C_LIGHTs_0000.fits 2026-08-24.09344 2461276.59344469 13.6360 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-23_21-14-23_20.00sec_-0.00C_LIGHT_0007.fits 2026-08-24.09285 2461276.59285171 13.6026 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-23_21-13-32_20.00sec_-0.00C_LIGHT_0006.fits 2026-08-20.11210 2461272.61210450 14.5695 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-19_21-41-15_20.00sec_-0.00C_LIGHTs_0005.fits 2026-08-20.11159 2461272.61159001 14.5967 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-19_21-40-31_20.00sec_-0.00C_LIGHTs_0004.fits 2026-08-20.09736 2461272.59736076 14.3316 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-19_21-20-01_20.00sec_-0.00C_LIGHT_0007.fits 2026-08-20.09692 2461272.59692312 14.3860 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-19_21-19-24_20.00sec_-0.00C_LIGHT_0006.fits 2026-08-19.10698 2461271.60698197 14.8798 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-18_21-33-53_20.00sec_0.00C_LIGHT_0007.fits 2026-08-19.10666 2461271.60665848 14.7993 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-18_21-33-25_20.00sec_0.00C_LIGHTs_0005.fits 2026-08-19.10640 2461271.60640330 14.7922 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-18_21-33-03_20.00sec_-0.00C_LIGHT_0006.fits 2026-08-19.10584 2461271.60584258 14.7505 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-18_21-32-14_20.00sec_0.00C_LIGHTs_0004.fits 2026-08-18.10021 2461270.60020926 14.4368 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-17_21-24-08_20.00sec_-0.00C_LIGHT_0009.fits 2026-08-18.09954 2461270.59954088 14.4124 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-17_21-23-10_20.00sec_-0.00C_LIGHT_0008.fits 2026-08-18.09736 2461270.59735897 14.1109 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-17_21-20-01_20.00sec_0.00C_LIGHTs_0005.fits 2026-08-18.09672 2461270.59671895 13.9898 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-17_21-19-06_20.00sec_0.00C_LIGHTs_0004.fits 2026-08-17.10088 2461269.60088115 14.5335 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-16_21-25-06_20.00sec_-0.00C_LIGHT_0009.fits 2026-08-17.10024 2461269.60024088 14.4566 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-16_21-24-10_20.00sec_-0.00C_LIGHT_0008.fits 2026-08-17.09804 2461269.59804399 14.1922 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-16_21-21-01_20.00sec_-0.00C_LIGHTs_0005.fits 2026-08-17.09738 2461269.59738310 14.1238 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-16_21-20-03_20.00sec_-0.00C_LIGHTs_0004.fits 2026-08-16.10202 2461268.60202049 14.4433 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-15_21-26-44_20.00sec_-0.00C_LIGHT_0009.fits 2026-08-16.10157 2461268.60157198 14.4596 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-15_21-26-05_20.00sec_-0.00C_LIGHT_0008.fits 2026-08-16.09947 2461268.59946912 14.2201 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-15_21-23-04_20.00sec_0.00C_LIGHTs_0005.fits 2026-08-16.09853 2461268.59852615 14.1318 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-15_21-21-42_20.00sec_-0.00C_LIGHTs_0004.fits 2026-08-15.11781 2461267.61781090 14.7228 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-14_21-49-28_20.00sec_-0.00C_LIGHTs_0005.fits 2026-08-15.11720 2461267.61720242 14.7315 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-08-14_21-48-36_20.00sec_-0.00C_LIGHTs_0004.fits 2026-08-15.10208 2461267.60208057 14.4084 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-14_21-26-49_20.00sec_-0.00C_LIGHT_0009.fits 2026-08-15.10160 2461267.60160350 14.4087 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-14_21-26-08_20.00sec_-0.00C_LIGHT_0008.fits 2026-08-13.13989 2461265.63989498 14.7236 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-08-12_22-21-16_20.00sec_-0.00C_LIGHT_0005.fits 2026-08-13.13940 2461265.63940102 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2461119.94511617 14.8573 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-03-20_05-40-48_20.00sec_-15.00C_LIGHT_0458.fits 2026-03-20.44461 2461119.94460639 14.8799 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-03-20_05-40-03_20.00sec_-15.00C_LIGHT_0457.fits 2026-03-19.48266 2461118.98266234 15.0047 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-03-19_06-34-52_20.00sec_-14.90C_LIGHT_0220.fits 2026-03-19.48183 2461118.98182816 15.0040 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-03-19_06-33-39_20.00sec_-14.90C_LIGHT_0219.fits 2026-02-27.51164 2461099.01164393 14.9567 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-27_06-16-36_20.00sec_-14.90C_LIGHT_0070.fits 2026-02-27.51089 2461099.01088971 14.9675 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-27_06-15-30_20.00sec_-15.00C_LIGHT_0069.fits 2026-02-27.47625 2461098.97625263 14.7794 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-02-27_05-25-38_20.00sec_-15.00C_LIGHT_0272.fits 2026-02-27.47575 2461098.97574767 14.7839 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-02-27_05-24-54_20.00sec_-15.00C_LIGHT_0271.fits 2026-02-27.47459 2461098.97458916 14.8848 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-27_05-23-14_20.00sec_-14.90C_LIGHT_0024.fits 2026-02-27.47404 2461098.97403815 14.9010 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-27_05-22-26_20.00sec_-15.00C_LIGHT_0023.fits 2026-02-22.49558 2461093.99557662 14.8507 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-02-22_05-53-27_20.00sec_-14.90C_LIGHT_0483.fits 2026-02-22.49500 2461093.99500249 14.8562 99.0000 upperlimit TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-02-22_05-52-38_20.00sec_-15.00C_LIGHT_0482.fits 2026-02-22.48853 2461093.98852902 14.9331 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-22_05-43-18_20.00sec_-15.00C_LIGHT_0578.fits 2026-02-22.48774 2461093.98773768 14.9337 99.0000 upperlimit TTUQ1b1x1 wcs_fd_Sgr-04-Q1b1x1_2026-02-22_05-42-10_20.00sec_-14.90C_LIGHT_0577.fits

Measurements excluded from the lightcurve

These measurements are excluded from the lightcurve, the plot and the AAVSO file. Reason visit_inconsistent: frames of the same field taken minutes apart disagree by more than the expected measurement scatter - a real star cannot change that fast, so at least one frame of the visit is corrupted (typically by patchy clouds) and there is no way to tell which one. Reason cloudy_frame: the frame failed the cloud check - its field stars disagree with the reference frame in a way uniform transparency loss cannot explain. The remaining reasons mean the measurement could not be made on that image at all, so no magnitude is shown: bad_ccd_region - the position falls on a masked part of the detector (bad_region.lst of that camera); saturated - the star is there but too bright to measure; blank_pixels_in_aperture, magnitude_calibration_failed and measurement_failed - the aperture contained blank pixels, the frame could not be calibrated, or the measuring tool failed. These images WERE taken and WERE measured: they are listed here so that a rejected measurement is never mistaken for a gap in the coverage. The excluded rows are kept in excluded_measurements.dat.

Date (UTC) JD(UTC) mag err reason camera image 2026-09-19.06657 2461302.56657296 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-18_20-35-41_20.00sec_-0.00C_LIGHT_0003.fits 2026-09-19.06578 2461302.56577868 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-18_20-34-33_20.00sec_-0.00C_LIGHT_0002.fits 2026-09-15.06948 2461298.56947617 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-14_20-39-52_20.00sec_-0.00C_LIGHT_0003.fits 2026-09-15.06892 2461298.56892084 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-14_20-39-04_20.00sec_-0.00C_LIGHT_0002.fits 2026-09-14.07030 2461297.57029778 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-13_20-41-03_20.00sec_0.00C_LIGHT_0003.fits 2026-09-14.06973 2461297.56973497 - - bad_ccd_region TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-13_20-40-15_20.00sec_-0.00C_LIGHT_0002.fits 2026-09-07.07934 2461290.57934027 14.4329 99.0000 visit_inconsistent TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-06_20-54-04_20.00sec_-0.00C_LIGHT_0005.fits 2026-09-07.07839 2461290.57838647 14.1960 0.3338 visit_inconsistent TTUQ2b1x1 wcs_fd_Sgr-04-Q2b1x1_2026-09-06_20-52-42_20.00sec_-0.00C_LIGHT_0004.fits