20106+3338 STT 541BC

Coord 2000	20106+3338		Discov num	STT 541		Comp	BC		Coord arcsec 2000	20 10 38.34 +33 37 50.7
Date first	1840		Date last	2017		Obs	25
Pa first	194		Pa last	182		P.A. Now (θ)	182°
Sep first	1.5		Sep last	1.8		Sep. Now (ρ)	1.8"
Mag pri	8.43		Mag sec	9.73		delta mag (ΔM)	1.3		Spectral class	B8V (blue-white)
Pri motion ra	-003		Sec motion ra	-003
Pri motion dec	+000		Sec motion dec	+000
Notes	N (See Notes)

Visually invisible, K-band or other infrared star Nature of this double is uncertain.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		69553	20106+3338	S 738	AB	1797	2019	43	106	42.6	7.76	8.43	0.67
Show		69554	20106+3338	STT 541	BC	1840	2017	25	182	1.8	8.43	9.73	1.30		<===

Triple system
3 visible stars in this system

Precise pa	182		Precise sep	1.77		Constellation	Cygnus		SAO	69554
HIP	99416		Tycho2	2675-03000-1		Gaia DR2	34321271296		HD	191813
BD	BD+33 3780		Distance	444.44		Distance ly	1449.76

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20106+3338	STT 541	BC	1999	22	183	1.8	8.43	9.73		D	201038.34+333750.7
20106+3338	STT 541	BC	2011	24	182	1.7	8.43	9.73		N	201038.34+333750.7
20106+3338	STT 541	BC	2017	25	182	1.8	8.43	9.73	B8V	N	201038.34+333750.7

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