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88 IAU CONSTELLATIONS - SCREENING AT RAPA NUI (phi = -27.113 deg)
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C1: northernmost reference star h_max in [16.0, 20.0] deg
C2: conventionally cruciform sky figure (Bayer / Norton classification)
C3: northernmost bright reference star is the visual cross apex
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Constellation          Reference star            h_max  C1  C2  C3  Score
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Auriga                 Capella                   16.89  YES  -   -   1/3
Crux                   Gacrux                    60.00   -  YES YES  2/3
Cygnus                 Deneb                     17.61  YES YES YES  3/3
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C1 passes (band 16.0-20.0): 2 constellations: ['Auriga', 'Cygnus']
C2 passes (cruciform):              2 constellations: ['Crux', 'Cygnus']
C3 passes (apex is northernmost):   2 constellations: ['Crux', 'Cygnus']

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TRIPLE CONJUNCTION C1 AND C2 AND C3 : 1 of 88 constellations
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  * Cygnus -- reference star Deneb culminates at 17.61 deg

Result: Cygnus is the unique IAU constellation satisfying C1 AND C2 AND C3.
