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21148+3803
LEP 100 AI

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Binocular doubles
Binary Systems
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Neglected List I
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

21148+3803 LEP 100 AI

21^h 14^m 47.49^s +38° 02' 43.1" P.A. 77.00 sep 534.5 mag 3.83,16.02 Sp F3V dist. 20.34 pc (66.35 l.y.)

Coord 2000	21148+3803		Discov num	LEP 100		Comp	AI		Coord arcsec 2000	21 14 47.49 +38 02 43.1
Date first	1998		Date last	2002		Obs	2
Pa first	77		Pa last	77.3		P.A. Now (θ)	77.3°
Sep first	534.1		Sep last	534.495		Sep. Now (ρ)	534.495"
Mag pri	3.83		Mag sec	16.02		delta mag (ΔM)	12.19		Spectral class	F3V (yellow-white)
Pri motion ra	+196		Sec motion ra	+216
Pri motion dec	+410		Sec motion dec	+453
Notes	N (See Notes)

rPM=0.094 (< 0.3, Physical double)

This double is physical.

21148+3803 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Tau Cyg	71121	21 14 47 +38 02 43	AGC 13 AB	2017	358	190	1.1	3.83	6.57	2.74	Y
Show		71121	21 14 47 +38 02 43	AGC 13 AC	2012	11	211	73.0	3.83	12.20	8.37
Show		71121	21 14 47 +38 02 43	AGC 13 AB,D	2004	15	208	205.4	3.83	9.94	6.11
Show		71121	21 14 47 +38 02 43	AGC 13 AE	2012	6	257	86.9	3.83	12.40	8.57
Show		71121	21 14 47 +38 02 43	AGC 13 AF	2012	37	184	89.5	3.83	11.95	8.12
Show		71121	21 14 47 +38 02 43	DAL 38 AG	2007	4	109	120.9	3.83	12.50	8.67
Show		71121	21 14 47 +38 02 43	LEP 100 AI	2002	2	77	534.5	3.83	16.02	12.19		<===
Show		71121	21 14 47 +38 02 43	FYM 110 AJ	2012	3	127	49.7	3.83	14.00	10.17
Show		71121	21 14 47 +38 02 43	FYM 110 AK	2012	3	316	99.0	3.83	14.40	10.57
Show		71121	21 14 47 +38 02 43	FYM 110 AL	2012	2	290	32.8	3.83	14.90	11.07
Show			21 14 57 +38 02 09	DAL 38 GH	2015	7	108	8.6	12.50	13.20	0.70
Show			21 14 47 +38 01 14	JOD 20 Fa,Fb	2018	4	349	0.9	12.20	13.80	1.60

13-fold system
13 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Cygnus		SAO	71121		HIP	104887		Tycho2	3169-03876-1
HD	202444		HR	8130		GC	29723		ADS	14787
GL	Gl 822.1A		BD	BD+37 4240		Bayer	Tau Cygni		Bayer name	Tau Cyg
Flamsteed	65 Cygni		Flamsteed name	65 Cyg		Distance	20.34		Distance ly	66.35
Bayer greek	τ Cyg