17146+1423 STF2140AB (Rasalgethi)

Coord 2000	17146+1423		Discov num	STF2140		Comp	AB		Coord arcsec 2000	17 14 38.86 +14 23 24.9
Date first	1777		Date last	2017		Obs	500
Pa first	117		Pa last	103		P.A. Now (θ)	102.7°
Sep first	9.0		Sep last	4.7		Sep. Now (ρ)	4.64"
Mag pri	3.48		Mag sec	5.40		delta mag (ΔM)	1.92		Spectral class	M5Ib-II (red)
Pri motion ra	-017		Sec motion ra	-007
Pri motion dec	+047		Sec motion dec	+033
Notes	N O (See Notes, Orbital solution)

rPM=0.344 This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		102680	17146+1423	CHR 139	Aa,Ab	1986	1991	3	231	0.2	3.48
Show	Rasalgethi	102680	17146+1423	STF2140	AB	1777	2017	500	103	4.6	3.48	5.40	1.92	Y	<===
Show		102680	17146+1423	AGC 16	AC	1888	1995	8	297	19.9	3.48	15.50	12.02
Show		102680	17146+1423	STF2140	AD	1878	2002	14	39	79.2	3.48	11.10	7.62

Quintuple system
4 visible stars in this system

Precise pa	102.8		Precise sep	4.7		Common name	Rasalgethi		Constellation	Hercules
SAO	102680		HIP	84345		Tycho2	0990-02133-1		Gaia DR2	4541877995116193408
HD	156014		HR	6406		GC	23277		ADS	10418
BD	BD+14 3207		Bayer	Alpha 1 Herculis		Bayer name	Alp1 Her		Flamsteed	64 Herculis
Flamsteed name	64 Her		Distance	110.25		Distance ly	359.64		last precise pa	102.8
last precise sep	4.7

Period (P)	3600y		Periastron (T)	1835y		Semi-major axis (a)	4.68a
Eccentricity (e)	0		Inclination (i)	155.8°		Longitude of periastron (ω)	0°
Node (Ω)	119.6°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	1970

label rho theta 2000 4.648 104.5 2001 4.648 104.4 2002 4.647 104.3 2003 4.647 104.2 2004 4.647 104.1 2005 4.646 104.0 2006 4.646 103.9 2007 4.645 103.8 2008 4.645 103.7 2009 4.645 103.6 2010 4.644 103.6 2011 4.644 103.5 2012 4.644 103.4 2013 4.643 103.3 2014 4.643 103.2 2015 4.642 103.1 2016 4.642 103.0 2017 4.641 102.9 2018 4.641 102.8 2019 4.641 102.7 2020 4.640 102.6 2021 4.640 102.5 2022 4.639 102.4 2023 4.639 102.3 2024 4.639 102.3 2025 4.638 102.2 2026 4.638 102.1 2027 4.637 102.0 2028 4.637 101.9 2029 4.636 101.8 2030 4.636 101.7 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
17146+1423	STF2140	AB	2007	438	105	4.8	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2009	448	105	4.9	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2010	459	103	4.7	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2012	462	104	4.6	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2013	471	103	4.8	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2014	476	103	4.8	3.48	5.40	M5Ib-II	NOD	171438.86+142324.9
17146+1423	STF2140	AB	2015	484	104	4.9	3.48	5.40	M5Ib-II	NO	171438.86+142324.9
17146+1423	STF2140	AB	2016	495	104	4.8	3.48	5.40	M5Ib-II	NO	171438.86+142324.9
17146+1423	STF2140	AB	2017	498	104	4.8	3.48	5.40	M5Ib-II	NO	171438.86+142324.9

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