19401+1801 J   121AB (Sham)

Coord 2000	19401+1801		Discov num	J   121		Comp	AB		Coord arcsec 2000	19 40 05.78 +18 00 50.2
Date first	1910		Date last	2015		Obs	11
Pa first	200		Pa last	180		P.A. Now (θ)	180°
Sep first	20.0		Sep last	28.9		Sep. Now (ρ)	28.9"
Mag pri	4.37		Mag sec	13.20		delta mag (ΔM)	8.83		Spectral class	G1III (yellow)
Pri motion ra	+015		Sec motion ra	+009
Pri motion dec	-020		Sec motion dec	+017
Notes	N (See Notes)

rPM=1.499 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Sham	105120	19401+1801	J 121	AB	1910	2015	11	180	28.9	4.37	13.20	8.83		<===
Show			19401+1801	J 121	AC	1910	2013	5	244	35.4	4.37	14.90	10.53
Show			19401+1801	WAL 118	AD	1897	2013	7	148	82.6	4.37	11.21	6.84

Quadruple system
4 visible stars in this system

Precise pa	180		Precise sep	28.9		Common name	Sham		Other names	ALSAHM
Constellation	Sagitta		SAO	105120		HIP	96757		Tycho2	1606-02341-1
Gaia DR2	55360974720		HD	185758		HR	7479		GC	27215
BD	BD+17 4042		Bayer	Alpha Sagittae		Bayer name	Alp Sge		Flamsteed	5 Sagittae
Flamsteed name	5 Sge		Distance	130.38		Distance ly	425.3

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19401+1801	J 121	AB	2007	6	180	30.2	4.37	13.20	G1III	N D	194005.78+180050.2
19401+1801	J 121	AB	2009	7	178	29.9	4.37	13.20	G1III	N D	194005.78+180050.2
19401+1801	J 121	AB	2013	9	181	29.5	4.37	13.20	G1III	N	194005.78+180050.2
19401+1801	J 121	AB	2015	11	180	28.9	4.37	13.20	G1III	N	194005.78+180050.2

If you need more information about this double, apply for a data request form to the WDS.