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04254+2218
STF 541 AB
Kap Tau

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

04254+2218 STF 541 AB (Kap Tau)

04^h 25^m 22.16^s +22° 17' 37.9" P.A. 174.00 sep 339.4 mag 4.22,5.29 Sp A7IV/V dist. 47.19 pc (153.93 l.y.)

Coord 2000	04254+2218		Discov num	STF 541		Comp	AB		Coord arcsec 2000	04 25 22.16 +22 17 37.9
Date first	1836		Date last	2016		Obs	34
Pa first	173		Pa last	173.9		P.A. Now (θ)	173.9°
Sep first	339.1		Sep last	339.44		Sep. Now (ρ)	339.44"
Mag pri	4.22		Mag sec	5.29		delta mag (ΔM)	1.07		Spectral class	A7IV/V (white)
Pri motion ra	+105		Sec motion ra	+112
Pri motion dec	-045		Sec motion dec	-048
Notes	N Z (See Notes, Parallax indicates components are physical)

rPM=0.062 (< 0.3, Physical double)

This double is physical.

04254+2218 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		76601	04 25 22 +22 17 38	OCC 327 Aa,Ab	1993	0	-1	0.0	5.20	5.20	0.00
Show	Kap Tau	76601	04 25 22 +22 17 38	STF 541 AB	2016	34	174	339.4	4.22	5.29	1.07		<===
Show		76601	04 25 22 +22 17 38	STF 541 A,CD	2013	6	176	177.6	4.22	10.59	6.37
Show		76601	04 25 22 +22 17 38	STF 541 AE	2014	5	269	146.5	4.22	13.08	8.86
Show		76602	04 25 25 +22 12 00	STF 541 B,CD	2014	6	350	163.3	5.29	9.50	4.21
Show		76602	04 25 25 +22 12 00	STF 541 BF	2014	5	216	108.3	5.29	13.70	8.41
Show			04 25 23 +22 14 38	STF 541 CD	2020	25	329	5.5	10.60	10.00	0.60

Septuple system
7 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	Kap Tau		Var name	NSV1593 Tau		Constellation	Taurus		SAO	76601
HIP	20635		Tycho2	1277-01626-1		Gaia DR2	145674574739951872		HD	27934
HR	1387		GC	5350		ADS	3201		BD	BD+21 642
Bayer	Kappa Tauri		Bayer name	Kap Tau		Flamsteed	65 Tauri		Flamsteed name	65 Tau
Distance	47.19		Distance ly	153.93		Bayer greek	κ Tau