AGASC ID 76683080

Info

Last Obs. 2026:259:10:40
magcatalog 9.89 ± 0.02
mag3 arcsec 9.86 ± 0.04
mag5 arcsec 9.86 ± 0.04
Nobs 9 (0 bad)
fok 95.9%
f3 arcsec 99.4%
f5 arcsec 99.7%

Timeline

Observation Info

OBSID Time Slot Row Col N Nmag est ok Nout fmag est ok fdr3 fdbox5 fmag est ok 3 ⟨ δ mag ⟩ 100s ⟨ mag ⟩ σmag Comments
7867 2007:273:23:56:21.304 4 117.9 389.7 10881 10781 22 99.8% 100.0% 100.0% 99.8% 0.04 9.86 0.00 --
7868 2008:023:19:32:57.523 5 17.1 409.5 14780 14620 38 99.4% 100.0% 100.0% 99.4% 0.03 9.84 0.00 --
8601 2008:218:04:02:53.363 5 -131.5 -232.5 4527 4475 8 99.8% 100.0% 100.0% 99.8% 0.04 9.85 0.00 --
8606 2008:218:17:31:49.957 4 -56.3 -422.1 4430 4228 6 96.5% 100.0% 100.0% 96.5% 0.03 9.84 0.00 --
19517 2017:205:05:37:21.637 5 -347.1 282.7 5506 5428 8 99.5% 100.0% 100.0% 99.5% 0.09 9.81 0.00 --
22526 2019:278:00:17:15.394 4 215.3 -358.7 14894 12921 54 87.3% 98.1% 98.5% 85.6% 0.11 9.92 0.00 --
41141 2026:258:23:16:46.226 7 -315.0 386.3 754 719 0 100.0% 93.6% 100.0% 93.6% 0.11 9.92 0.00 --
41139 2026:259:03:15:57.786 7 -329.9 373.3 1721 1668 1 99.6% 98.4% 100.0% 98.0% 0.16 9.91 0.00 --
41136 2026:259:10:40:56.737 6 -356.0 347.7 733 690 0 100.0% 95.8% 100.0% 95.8% 0.12 9.94 0.00 --

  • sample: One sample of ACA image telemetry. This could be a real image readout or it could be a null 4x4 image when the ACA is not tracking. Be aware that the sample period is faster for null 4x4 images (1.025 sec) than for typical 6x6 or 8x8 tracked images (2.05 or 4.1 sec respectively).
  • Kalman samples: Subset of samples when ACA could be tracking stars (AOPCADMD == NPNT & AOACASEQ == KALM)
  • dr3: Subset of tracked Kalman samples with radial centroid residual < 3 arcsec. This corresponds to "high quality" readouts. This effectively includes the track subset (AOACFCT == TRAK) because readouts with no TRAK are assigned an infinite centroid residual.
  • dbox5: Subset of tracked Kalman samples with centroid residual within a 5 arcsec box. This corresponds to spatial filter used by the OBC for inclusion in Kalman filter. This effectively includes the track subset (AOACFCT == TRAK) because readouts with no TRAK are assigned an infinite centroid residual.
  • track: Subset of Kalman samples where the image is being tracked (AOACFCT == TRAK)
  • sat_pix: Subset of Kalman samples with saturated pixel flag OK (AOACISP == OK)
  • ion_rad: Subset of Kalman samples with ionizing radiation flag OK (AOACIIR == OK)
  • mag_est_ok: Subset of Kalman samples that have a magnitude estimate (track & ion_rad)
  • n_total: Total number of sample regardless of OBC PCAD status
  • n: Synonym for n_total
  • n_kalman: Number of Kalman samples
  • n_dr3: Number of dr3 samples.
  • n_dbox5: Number of dbox5 samples.
  • n_track: Number of track samples.
  • n_ok_3: Number of (track & sat_pix & ion_rad & dr3) samples
  • n_ok_5: Number of (track & sat_pix & ion_rad & dbox5) samples
  • n_mag_est_ok: Number of (track & ion_rad) samples
  • n_mag_est_ok_3: Number of (track & ion_rad & dr3) samples
  • n_mag_est_ok_5: Number of (track & ion_rad & dbox5) samples
  • f_dr3: Fraction of mag-est-ok samples with centroid residual < 3 arcsec((mag_est_ok & n_dr3)/n_mag_est_ok)
  • f_dbox5: Fraction of mag-est-ok samples with centroid within 5 arcsec box((mag_est_ok & n_dbox5)/n_mag_est_ok)
  • f_mag_est_ok: n_mag_est_ok_3/n_kalman. This is a measure of the fraction of time during an observation that a magnitude estimate is available.
  • f_mag_est_ok_3: n_mag_est_ok_3/n_kalman.
  • f_mag_est_ok_5: n_mag_est_ok_5/n_kalman.
  • f_ok: n_ok_5 / n_kalman. Same as f_ok_5
  • f_ok_3: n_ok_3 / n_kalman. This is a measure of the fraction of time during an observation that the Kalman filter is getting high-quality star centroids.
  • f_ok_5: n_ok_5 / n_kalman. This is a measure of the fraction of time during an observation that the Kalman filter is getting any star centroid at all. This includes measurements out to 5 arcsec box halfwidth, so potentially 7 arcsec radial offset.