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Doubles in session

Current system

20136+3553
SEI 1021 AB

Selections

Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20136+3553 SEI 1021 AB

20^h 13^m 34.11^s +35° 52' 53.8" P.A. 248.00 sep 13.4 mag 10.90,12.40

Coord 2000	20136+3553		Discov num	SEI1021		Comp	AB		Coord arcsec 2000	20 13 34.11 +35 52 53.8
Date first	1896		Date last	2015		Obs	8
Pa first	241		Pa last	247.5		P.A. Now (θ)	247.5°
Sep first	14.7		Sep last	13.408		Sep. Now (ρ)	13.408"
Mag pri	10.90		Mag sec	12.40		delta mag (ΔM)	1.5		Spectral class
Pri motion ra	-007		Sec motion ra	+004
Pri motion dec	-009		Sec motion dec	+007
Notes

rPM=1.703

This double is not physical.

20136+3553 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20 13 34 +35 52 54	SEI 1021 AB	2015	8	248	13.4	10.90	12.40	1.50		<===
Show			20 13 34 +35 52 54	SEI 1021 AC	2015	2	253	10.3	10.90	14.20	3.30
Show			20 13 34 +35 52 54	SEI 1021 AD	2015	7	121	6.9	10.90	15.10	4.20
Show			20 13 33 +35 52 48	SEI 1021 BC	2016	3	52	3.3	12.40	14.20	1.80

Quadruple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Tycho2

2683-03118-1

Gaia DR2

2058916891197902336