Archival forced photometry results
Job 20261016-203043_NniyhSnN: position 03:53:28.87 +11:24:21.7; band: auto; submitted 2026-10-16 20:30:43 UTC from ::1.
36 of 36 image(s) yielded a measurement; 0 skipped (target off-frame or calibration failed; see the skip log).
| Date (UTC) | JD (UTC) | mag | err | Status | Band | Field | Cutout | Image |
|---|---|---|---|---|---|---|---|---|
| 2026-07-22.3972 | 2461243.8973 | 11.06 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-22.3967 | 2461243.8967 | 11.09 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-22.3936 | 2461243.8937 | 10.93 | 0.01 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-22.3931 | 2461243.8931 | 10.96 | 0.01 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-21.3946 | 2461242.8946 | 10.98 | 0.01 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-21.3832 | 2461242.8832 | 10.77 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-20.4502 | 2461241.9503 | 11.03 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-20.4184 | 2461241.9185 | 11.12 | 0.01 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-12.4003 | 2461233.9004 | 10.69 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-12.3998 | 2461233.8999 | 10.64 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-07.4323 | 2461228.9323 | 11.06 | 0.02 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-07.4316 | 2461228.9317 | 11.04 | 0.01 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-07-07.4311 | 2461228.9312 | 10.72 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-07-07.4304 | 2461228.9304 | 10.77 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-03-27.1174 | 2461126.6174 | 11.46 | 0.02 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-03-27.1169 | 2461126.6169 | 11.44 | 0.02 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-03-26.1084 | 2461125.6085 | 11.67 | 0.02 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-03-26.1078 | 2461125.6079 | 11.63 | 0.02 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-02-27.1467 | 2461098.6467 | 10.99 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-27.1461 | 2461098.6461 | 10.98 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-22.1577 | 2461093.6577 | 10.22 | 0.00 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-02-22.1572 | 2461093.6572 | 10.19 | 0.00 | detection | V | Tau-05-Q2b1x1 |  |  FITS |
| 2026-02-22.1514 | 2461093.6515 | 10.89 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-22.1504 | 2461093.6505 | 10.89 | 0.01 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-12.1686 | 2461083.6686 | 10.65 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-12.1681 | 2461083.6681 | 10.67 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-11.1826 | 2461082.6826 | 10.68 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-02-11.1821 | 2461082.6822 | 10.68 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-21.1856 | 2461061.6857 | 10.24 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-21.1851 | 2461061.6851 | 10.23 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-18.2021 | 2461058.7022 | 10.23 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-18.2016 | 2461058.7017 | 10.22 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-09.1723 | 2461049.6724 | 10.04 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2026-01-09.1717 | 2461049.6717 | 10.05 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2025-12-23.2425 | 2461032.7426 | 9.78 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
| 2025-12-23.2419 | 2461032.7420 | 9.78 | 0.00 | detection | V | Tau-05-Q1b1x1 |  |  FITS |
Data files: lightcurve.dat (detections), lightcurve.eps (EPS figure)
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.
Photometry table
date JD mag/limit err status field image 2026-07-22.3972 2461243.8973 11.06 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-22_04-31-53_20.00sec_0.00C_LIGHTs_0363.fits 2026-07-22.3967 2461243.8967 11.09 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-22_04-31-05_20.00sec_-0.00C_LIGHTs_0362.fits 2026-07-22.3936 2461243.8937 10.93 0.01 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-22_04-26-43_20.00sec_5.00C_LIGHT_0425.fits 2026-07-22.3931 2461243.8931 10.96 0.01 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-22_04-25-58_20.00sec_5.00C_LIGHT_0424.fits 2026-07-21.3946 2461242.8946 10.98 0.01 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-21_04-28-06_20.00sec_5.00C_LIGHT_0956.fits 2026-07-21.3832 2461242.8832 10.77 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-21_04-11-38_20.00sec_-0.00C_LIGHTs_0788.fits 2026-07-20.4502 2461241.9503 11.03 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-20_05-48-14_20.00sec_0.00C_LIGHTs_0404.fits 2026-07-20.4184 2461241.9185 11.12 0.01 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-20_05-02-26_20.00sec_5.00C_LIGHT_0463.fits 2026-07-12.4003 2461233.9004 10.69 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-12_04-36-21_20.00sec_-0.00C_LIGHTs_0387.fits 2026-07-12.3998 2461233.8999 10.64 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-12_04-35-37_20.00sec_-0.00C_LIGHTs_0386.fits 2026-07-07.4323 2461228.9323 11.06 0.02 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-07_05-22-23_20.00sec_5.00C_LIGHT_0477.fits 2026-07-07.4316 2461228.9317 11.04 0.01 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-07-07_05-21-25_20.00sec_4.90C_LIGHT_0476.fits 2026-07-07.4311 2461228.9312 10.72 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-07_05-20-41_20.00sec_-0.00C_LIGHTs_0441.fits 2026-07-07.4304 2461228.9304 10.77 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-07-07_05-19-37_20.00sec_-0.00C_LIGHTs_0440.fits 2026-03-27.1174 2461126.6174 11.46 0.02 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-03-26_21-48-56_20.00sec_-10.00C_LIGHT_0059.fits 2026-03-27.1169 2461126.6169 11.44 0.02 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-03-26_21-48-10_20.00sec_-10.00C_LIGHT_0058.fits 2026-03-26.1084 2461125.6085 11.67 0.02 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-03-25_21-36-03_20.00sec_-10.00C_LIGHT_0285.fits 2026-03-26.1078 2461125.6079 11.63 0.02 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-03-25_21-35-11_20.00sec_-10.00C_LIGHT_0284.fits 2026-02-27.1467 2461098.6467 10.99 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-26_21-31-06_20.00sec_-15.00C_LIGHT_0102.fits 2026-02-27.1461 2461098.6461 10.98 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-26_21-30-16_20.00sec_-14.90C_LIGHT_0101.fits 2026-02-22.1577 2461093.6577 10.22 0.00 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-02-21_21-46-57_20.00sec_-15.00C_LIGHT_0093.fits 2026-02-22.1572 2461093.6572 10.19 0.00 detection Tau-05-Q2b1x1 wcs_fd_Tau-05-Q2b1x1_2026-02-21_21-46-12_20.00sec_-15.00C_LIGHT_0092.fits 2026-02-22.1514 2461093.6515 10.89 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-21_21-37-57_20.00sec_-15.00C_LIGHT_0101.fits 2026-02-22.1504 2461093.6505 10.89 0.01 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-21_21-36-31_20.00sec_-15.00C_LIGHT_0100.fits 2026-02-12.1686 2461083.6686 10.65 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-11_22-02-37_20.00sec_-15.00C_LIGHT_0128.fits 2026-02-12.1681 2461083.6681 10.67 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-11_22-01-56_20.00sec_-15.00C_LIGHT_0127.fits 2026-02-11.1826 2461082.6826 10.68 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-10_22-22-50_20.00sec_-15.00C_LIGHT_0129.fits 2026-02-11.1821 2461082.6822 10.68 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-02-10_22-22-08_20.00sec_-14.90C_LIGHT_0128.fits 2026-01-21.1856 2461061.6857 10.24 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-20_22-27-12_20.00sec_-14.90C_LIGHT_0185.fits 2026-01-21.1851 2461061.6851 10.23 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-20_22-26-23_20.00sec_-14.90C_LIGHT_0184.fits 2026-01-18.2021 2461058.7022 10.23 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-17_22-50-57_20.00sec_-15.00C_LIGHT_0177.fits 2026-01-18.2016 2461058.7017 10.22 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-17_22-50-13_20.00sec_-14.90C_LIGHT_0176.fits 2026-01-09.1723 2461049.6724 10.04 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-08_22-08-02_20.00sec_-14.90C_LIGHT_0138.fits 2026-01-09.1717 2461049.6717 10.05 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2026-01-08_22-07-04_20.00sec_-14.90C_LIGHT_0137.fits 2025-12-23.2425 2461032.7426 9.78 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2025-12-22_23-49-07_20.00sec_-15.00C_LIGHT_0265.fits 2025-12-23.2419 2461032.7420 9.78 0.00 detection Tau-05-Q1b1x1 wcs_fd_Tau-05-Q1b1x1_2025-12-22_23-48-17_20.00sec_-14.90C_LIGHT_0264.fits
Total computation time: 4 min 7.9 s (average 6.9 s per image over 36 processed).
UCAC5 plate-solve: 36 of 36 image(s) solved in parallel in 2 min 26.4 s (workers: 8); SExtractor catalogs reused: 0; funpacked: 0.
Measured on 2026-10-16 20:34:51 UTC.
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