20204+3840 SEI1088AB

Coord 2000	20204+3840		Discov num	SEI1088		Comp	AB		Coord arcsec 2000	20 20 18.47 +38 39 29.5
Date first	1896		Date last	2015		Obs	8
Pa first	241		Pa last	238		P.A. Now (θ)	238°
Sep first	4.2		Sep last	4.3		Sep. Now (ρ)	4.3"
Mag pri	10.30		Mag sec	11.60		delta mag (ΔM)	1.3		Spectral class
Pri motion ra	+036		Sec motion ra
Pri motion dec	+019		Sec motion dec
Notes	R (Red magnitudes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 20 18 +38 39 30	SEI 1088 AB	2015	8	238	4.3	10.30	11.60	1.30		<===
Show			20 20 18 +38 39 30	SEI 1089 AC	2015	11	17	28.2	10.30	10.47	0.17

Triple system
3 visible stars in this system

Precise pa	238		Precise sep	4.317		Constellation	Cygnus		Tycho2	3152-01617-1
Gaia DR2	2061287880623328384

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20204+3840	SEI1088	AB	1994	4	235	3.7	10.56	11.60			202019.18+383956.4
20204+3840	SEI1088	AB	2013	5	238	4.4	10.56	11.60			202019.18+383956.4
20204+3840	SEI1088	AB	2015	8	238	4.3	10.30	11.60		R	202018.47+383929.5

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