Talk:Marat Arakelian

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Measurements of galactic survey[edit]

One of my sources describes Arakelian’s 1975 survey of high-surface-brightness galaxies as “a list of 621 objects with surface brightness at least 22.0 magnitudes from an area of 1 sq. arcsec. The sample contained 4% of all galaxies in an area of with d>-3° and |b|>20°.”

I get what 22.0 mag and the area of 1 sq. arc second are. I believe “|b|>20°” is the galactic latitude per Galactic coordinate system. But I can’t figure out what “ d>-3°” is. - TimDWilliamson ^speak