02318+8916 STF  93AB (Polaris)

Coord 2000	02318+8916		Discov num	STF  93		Comp	AB		Coord arcsec 2000	02 31 49.09 +89 15 50.7
Date first	1779		Date last	2016		Obs	65
Pa first	203		Pa last	236		P.A. Now (θ)	236°
Sep first	17.3		Sep last	18.4		Sep. Now (ρ)	18.4"
Mag pri	2.04		Mag sec	9.10		delta mag (ΔM)	7.06		Spectral class	F7Ib+F3V (yellow-white/yellow-white)
Pri motion ra	+038		Sec motion ra
Pri motion dec	-015		Sec motion dec
Notes	N V (See Notes, Proper motion indicates physical)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		308	02 31 49 +89 15 51	WRH 39 Aa,Ab	2014	8	134	0.1	2.30	4.30	2.00	Y
Show	Polaris	308	02 31 49 +89 15 51	STF 93 AB	2016	65	236	18.4	2.04	9.10	7.06		<===
Show		308	02 31 49 +89 15 51	STF 93 AC	2016	7	103	39.0	2.04	13.80	11.76
Show		308	02 31 49 +89 15 51	STF 93 AD	2016	8	194	83.2	2.04	14.30	12.26
Show		305	02 30 43 +89 15 39	STF 93 BC	2015	4	83	53.1	9.10	13.80	4.70
Show		305	02 30 43 +89 15 39	STF 93 BD	2014	3	179	69.4	9.10	14.30	5.20

Quintuple system
4 visible stars in this system

Precise pa	235.7		Precise sep	18.39		Common name	Polaris		Other names	Lodestar, Cynosura, Alruccabah, Phoenice, Polare, Stella Polare, Tramontana, Angel Stern, Navigatoria, Star of Arcady, Yilduz, Mismar, Polyarnaya
Constellation	Ursa Minor		SAO	308		HIP	11767		Gaia DR2	576402619921505664
HD	8890		HR	424		GC	2243		BD	BD+88 8
Bayer	Alpha Ursae Minoris		Bayer name	Alp Umi		Flamsteed	1 Ursae Minoris		Flamsteed name	1 Umi
Distance	132.63		Distance ly	432.64

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
02318+8916	STF 93	AB	2006	59	231	18.2	2.10	9.10	F7:Ib-IIv	N D	023147.08+891550.9
02318+8916	STF 93	AB	2009	60	232	18.2	2.10	9.10	F7:Ib-IIv	N D	023147.08+891550.9
02318+8916	STF 93	AB	2013	63	233	18.1	2.04	9.10	F7:Ib-IIv	N D	023147.08+891550.9
02318+8916	STF 93	AB	2016	64	236	18.4	2.04	9.10	F7:Ib-IIv	NV	023149.09+891550.7

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