20312+1116 STF2690A,BC

Coord 2000	20312+1116		Discov num	STF2690		Comp	A,BC		Coord arcsec 2000	20 31 11.94 +11 15 33.7
Date first	1777		Date last	2019		Obs	160
Pa first	281		Pa last	255		P.A. Now (θ)	255°
Sep first	15.0		Sep last	17.8		Sep. Now (ρ)	17.8"
Mag pri	7.12		Mag sec	7.39		delta mag (ΔM)	0.27		Spectral class	B8V (blue-white)
Pri motion ra	-004		Sec motion ra	-006
Pri motion dec	-003		Sec motion dec	-010
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.624 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		106196	20312+1116	CHR 99	Aa,Ab	1983	2016	14	142	0.4	7.10
Show		106195	20312+1116	STF2690	A,BC	1777	2019	160	255	17.8	7.12	7.39	0.27		<===
Show		106195	20312+1116	HJ 269	AD	1825	2016	17	108	23.0	7.12	12.10	4.98
Show		106195	20312+1116	DA 1	BC	1840	2016	98	190	0.4	7.90	8.00	0.10	Y

Quintuple system
5 visible stars in this system

Precise pa	255		Precise sep	17.766		Constellation	Delphinus		SAO	106195
HIP	101233		Tycho2	1095-01695-1		Gaia DR2	88501616128		HD	195482
Distance	59.99		Distance ly	195.69

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20312+1116	STF2690	A,BC	2006	144	255	17.4	7.12	7.39	B8V	D	203111.94+111533.7
20312+1116	STF2690	A,BC	2008	145	255	17.7	7.12	7.39	B8V	D	203111.94+111533.7
20312+1116	STF2690	A,BC	2009	149	255	17.3	7.12	7.39	B8V	N D	203111.94+111533.7
20312+1116	STF2690	A,BC	2011	150	256	17.7	7.12	7.39	B8V	N D	203111.94+111533.7
20312+1116	STF2690	A,BC	2013	155	255	17.6	7.12	7.39	B8V	N D	203111.94+111533.7
20312+1116	STF2690	A,BC	2017	157	256	17.7	7.12	7.39	B8V	N	203111.94+111533.7
20312+1116	STF2690	A,BC	2018	158	256	17.7	7.12	7.39	B8V	N	203111.94+111533.7
20312+1116	STF2690	A,BC	2019	160	255	17.8	7.12	7.39	B8V	N	203111.94+111533.7

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