Close binaries for March.

Close binary challenges for March.
These are mainly 2″ of separation of less. I’ve observed these in a 150 refractor and the wider ones in 102.These are at the limits of what our poor atmosphere can give you to observe. Historical records ( such as Burnham) and the Washington double star data base are an indication of widening or closing pairs.
Ursa Major.
Iota (Talitha) (SAO 42630 ) 4.1″ at +3.1 and +9.2, I’d note this as difficult with a white and blue in the glare.
Σ1559 (SAO 15580) 1.8″ at +6.8 and +8.0, a lovely delicate speck.
ΟΣ 200 (SAO 27246) 1.3″ at +6.5 and +8.6.
78 UMa (SAO 28601) 1.2″ at +5 and +7.9, white and blue.
Σ1770 (SAO 28819) 1.7″ at +6.9 and +8.2.

Ursa Minor.
Σ 2034 (SAO 2625) 1.1″ at +7.7 and +8.0, bright and near equal.

Leo.
Σ1406 (SAO 61853) 1.0″ at +8 and +8.5.
ΟΣ 215 (SAO 99032) 2.4″ at +7.2 and +7.5 Blue and white at x160,
Σ 1500 (SAO 137933) 1.4″ at +7.9 and +8.3.
Iota (SAO 99587) 1.7″, a yellow and blue at x216.
Σ 1555 (SAO 81893) given at.7″, I got this at x216 and it appeared much wider.

Canes Venatici
25 CNv (SAO 63648) 1.8″ at +5.0 and +7.0, a white and blue.

Coma Berenices.
Σ1639 (SAO 82293) 1.7″ at +6.7 and +7.8, green and white and widening.
35 (Σ1687) triple from 1.2″ to 27.9″.
ΟΣ 266 at 13h28.4m. +15 43′ , 2″ separation at +8.0 and +8.4, caught in the 102mm.

These are challenging and require patience , good seeing and a bit of aperture under

Clear skies! Nick.