Image archives
Survey and observatory archives are useful for historical context, object confirmation, and comparison across filters or epochs.
Data index
Open archives and reduction notes
A practical map of public astronomy data sources, image calibration concerns, and repeatable checks used before drawing conclusions from pretty pictures.
Alert streams
Transient brokers help filter candidates by brightness, color, motion, host association, and prior detection history.
Ephemerides
Accurate timing and sky position checks are essential for planets, comets, occultations, and small-body follow-up.
Calibration workflow
Frame selection
Discard frames with tracking jumps, cloud gradients, saturated targets, or obvious aircraft trails.
Bias and dark treatment
Match temperature, exposure time, and gain when master calibration frames are available.
Flat-field review
Check for dust pattern drift and uneven illumination before trusting faint background structures.
Photometric check
Compare catalog stars and avoid interpreting color differences from unbalanced processing.
Data quality hints
Seeingstable starspreferred
Transparencylow cloud gradientcritical
Moon phasebackground controltarget dependent
Filter setcolor reliabilitydocumented
Plate solveposition confidencerequired