02543+5246 EDG 1 AB (Tau Per)

02^h 54^m 15.46^s +52° 45' 45.0" P.A. 107.00 sep 51.0 mag 3.95,12.28 Sp G4III+A4V dist. 77.94 pc (254.24 l.y.)

Coord 2000	02543+5246		Discov num	EDG 1		Comp	AB		Coord arcsec 2000	02 54 15.46 +52 45 45.0
Date first	1878		Date last	2015		Obs	9
Pa first	109		Pa last	107.1		P.A. Now (θ)	107.1°
Sep first	47.3		Sep last	50.997		Sep. Now (ρ)	50.997"
Mag pri	3.95		Mag sec	12.28		delta mag (ΔM)	8.33		Spectral class	G4III+A4V (yellow/white)
Pri motion ra	-001		Sec motion ra	+002
Pri motion dec	-004		Sec motion dec	-001
Notes	N (See Notes)

rPM=1.029

This double is not physical.

02543+5246 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		23685	02 54 15 +52 45 45	LAB 1 Aa,Ab	2010	13	277	0.1	4.20	5.90	1.70	Y
Show	Tau Per	23685	02 54 15 +52 45 45	EDG 1 AB	2015	9	107	51.0	3.95	12.28	8.33		<===
Show		23685	02 54 15 +52 45 45	BU 1376 AC	2014	5	107	50.9	3.95	12.70	8.75
Show		23685	02 54 15 +52 45 45	BU 1376 AD	2015	4	338	41.9	3.95	11.50	7.55
Show			02 54 21 +52 45 30	BU 1376 BC	2009	7	86	4.2	12.28	12.70	0.42

Quintuple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	Tau Per		Constellation	Perseus		SAO	23685		HIP	13531
Tycho2	3701-01394-1		Gaia DR2	441161693272720640		HD	17878		HR	854
GC	3462		ADS	2202		BD	BD+52 641		Bayer	Tau Persei
Bayer name	Tau Per		Flamsteed	18 Persei		Flamsteed name	18 Per		FK5	103
Distance	77.94		Distance ly	254.24		Bayer greek	τ Per