Open observing resource

AGN Reference Fields

Finding charts and comparison-star sequences for differential optical photometry of active galactic nuclei.

Download APASS reference-star CSV Browse fields
5AGN fields
17comparison stars
IAC80CAMELOT2 optical monitoring

Indexed object pages

Dedicated static pages make each finding chart and comparison-star sequence directly discoverable by object name in search engines.

Mrk 42 CGCG 243-024 · 2MIG 1646

Finding chart + 4 comparison stars · IAC80 / CAMELOT2 · V band

IC 5287 2MIG 3128

Finding chart + 3 comparison stars · IAC80 / CAMELOT2 · V band

Mrk 845 MCG+09-25-022 · 2MIG 2067

Finding chart + 4 comparison stars · IAC80 / CAMELOT2 · V band

IC 1495 IC 5327 · MCG−02−59−024 · 2MIG 3166

Finding chart + 3 comparison stars · IAC80 / CAMELOT2 · R and V bands

UGC 12282 PGC 70163 · 2MIG 3110

Finding chart + 3 comparison stars · V-band reference sequence

Interactive reference fields

APASS CSV Core JSON IC 1495 CSV UGC 12282 CSV

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What this resource contains

AGN finding charts, local comparison-star sequences, IAC80/CAMELOT2 observing information where available, and machine-readable reference tables. Mrk 42, IC 5287 and Mrk 845 include APASS DR9 multiband catalogue photometry with J2000 comparison-star coordinates. IC 1495 includes APASS DR9 J2000 positions and V/g′/r′/i′ photometry for three comparison stars, together with Lupton-derived R estimates used for the R-band reduction. UGC 12282 includes the supplied J2000 positions, V magnitudes and B−V colours for its three numbered comparison stars and the original finding chart.