20001+1737 S   730AC

Coord 2000	20001+1737		Discov num	S   730		Comp	AC		Coord arcsec 2000	20 00 08.28 +17 36 38.6
Date first	1879		Date last	2015		Obs	23
Pa first	339		Pa last	338		P.A. Now (θ)	338°
Sep first	80.3		Sep last	78.6		Sep. Now (ρ)	78.6"
Mag pri	7.16		Mag sec	10.21		delta mag (ΔM)	3.05		Spectral class	K0 (yellow-orange)
Pri motion ra	+005		Sec motion ra	+000
Pri motion dec	+011		Sec motion dec	-004
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=1.309 This double is not physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		105523	20001+1737	S 730	AB	1825	2014	27	14	112.8	7.16	8.45	1.29
Show		105523	20001+1737	S 730	AC	1879	2015	23	338	78.6	7.16	10.21	3.05		<===
Show		105523	20001+1737	S 730	AD	1879	2015	17	198	41.1	7.16	9.90	2.74
Show		105523	20001+1737	HO 638	AE	1889	1928	4	283	2.7	7.16	10.20	3.04
Show		105525	20001+1737	S 730	BC	1879	2019	17	237	68.6	8.45	10.21	1.76

Quintuple system
5 visible stars in this system

Precise pa	337.5		Precise sep	78.605		Constellation	Sagitta		SAO	105523
HIP	98443		Tycho2	1621-01879-1		Gaia DR2	68613989504		HD	189576
BD	BD+17 4185		Distance	666.67		Distance ly	2174.68

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20001+1737	S 730	AC	2002	12	338	79.0	7.16	10.21	K0	N D	200008.28+173638.6
20001+1737	S 730	AC	2010	14	338	78.5	7.16	10.21	K0	N D	200008.28+173638.6
20001+1737	S 730	AC	2011	17	338	78.9	7.16	10.21	K0	N D	200008.28+173638.6
20001+1737	S 730	AC	2012	18	338	78.5	7.16	10.21	K0	N D	200008.28+173638.6
20001+1737	S 730	AC	2013	20	338	78.8	7.16	10.21	K0	N	200008.28+173638.6
20001+1737	S 730	AC	2014	22	338	78.5	7.16	10.21	K0	N	200008.28+173638.6
20001+1737	S 730	AC	2015	23	338	78.6	7.16	10.21	K0	N	200008.28+173638.6

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