... (NED)¹ https://ned.ipac.caltech.edu

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... IRAF² IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation

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... photometry³ https://gea.esac.esa.int/archive/documentation/GDR3/ Gaia_archive/chap_datamodel/sec_dm_performance_verification/ ssec_dm_synthetic_photometry_gspc.html

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... Calculator⁴ https: //edd.ifa.hawaii.edu/NAMcalculator

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