18551+4051 HEI  73

Coord 2000	18551+4051		Discov num	HEI  73		Comp			Coord arcsec 2000	18 55 06.56 +40 50 31.6
Date first	1979		Date last	2015		Obs	7
Pa first	321		Pa last	322		P.A. Now (θ)	322°
Sep first	0.5		Sep last	0.8		Sep. Now (ρ)	0.8"
Mag pri	10.95		Mag sec	11.10		delta mag (ΔM)	0.15		Spectral class
Pri motion ra	-002		Sec motion ra	-002
Pri motion dec	-004		Sec motion dec	-004
Notes	N (See Notes)

Nature of this double is uncertain.

Precise pa	322		Precise sep	0.77		Constellation	Lyra		Tycho2	3123-01256-1
Gaia DR2	2103677528500608896

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18551+4051	HEI 73		1997	5	358	0.3	10.95	11.10			185506.56+405031.6
18551+4051	HEI 73		2008	6	319	0.7	10.95	11.10			185506.56+405031.6
18551+4051	HEI 73		2015	7	322	0.8	10.95	11.10			185506.56+405031.6

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