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16413+3136
STF2084
Zet Her

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

16413+3136 STF2084 (Zet Her)

16^h 41^m 17.16^s +31° 36' 09.8" P.A. 100.00 sep 1.5 mag 2.95,5.40 Sp G1IV dist. 10.72 pc (34.97 l.y.)

Coord 2000	16413+3136		Discov num	STF2084		Comp			Coord arcsec 2000	16 41 17.16 +31 36 09.8
Date first	1826		Date last	2019		Obs	856
Pa first	23		Pa last	110		P.A. Now (θ)	100°
Sep first	0.9		Sep last	1.6		Sep. Now (ρ)	1.47"
Mag pri	2.95		Mag sec	5.40		delta mag (ΔM)	2.45		Spectral class	G1IV (yellow)
Pri motion ra	-463		Sec motion ra
Pri motion dec	+345		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	110.3		Precise sep	1.63		Name	Zet Her		Constellation	Hercules
SAO	65485		HIP	81693		Tycho2	2582-03158-1		HD	150680
HR	6212		GC	22464		ADS	10157		GL	Gl 635A
BD	BD+31 2884		Bayer	Zeta Herculis		Bayer name	Zet Her		Flamsteed	40 Herculis
Flamsteed name	40 Her		Distance	10.72		Distance ly	34.97		last precise pa	110.3
last precise sep	1.63

ORBITAL ELEMENTS

Period (P)	34.4638y	± 0.0251	Periastron (T)	1933.3518y	± 0.0492	Semi-major axis (a)	1.32834a	± 0.00807
Eccentricity (e)	0.46342	± 0.00417	Inclination (i)	131.6°	± 0.578	Longitude of periastron (ω)	113.177°	± 0.803
Node (Ω)	50.601°	± 0.746	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label	rho	theta
2000	0.714	12.9
2001	0.533	343.9
2002	0.493	299.7
2003	0.624	263.3
2004	0.789	241.4
2005	0.915	226.5
2006	0.997	214.7
2007	1.046	204.4
2008	1.075	194.8
2009	1.094	185.6
2010	1.108	176.6
2011	1.124	167.9
2012	1.142	159.4
2013	1.166	151.3
2014	1.194	143.5
2015	1.228	136.1
2016	1.265	129.1
2017	1.306	122.6
2018	1.348	116.4
2019	1.391	110.6
2020	1.431	105.2
2021	1.469	100.0
2022	1.503	95.1
2023	1.530	90.4
2024	1.549	85.8
2025	1.559	81.3
2026	1.557	76.9
2027	1.542	72.4
2028	1.511	67.7
2029	1.461	62.8
2030	1.389	57.5

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds16413%2B3136c.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16413+3136	STF2084		2007	807	198	1.1	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2008	813	185	1.2	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2010	819	173	1.1	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2011	824	166	1.3	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2013	835	149	1.3	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2014	836	141	1.3	2.95	5.40	G1IV	NOD	164117.46+313607.0
16413+3136	STF2084		2015	837	134	1.3	2.95	5.40	G1IV	NO	164117.46+313607.0
16413+3136	STF2084		2016	840	126	1.5	2.95	5.40	G1IV	NO	164117.16+313609.8
16413+3136	STF2084		2017	845	121	1.6	2.95	5.40	G1IV	NO	164117.16+313609.8
16413+3136	STF2084		2018	846	115	1.6	2.95	5.40	G1IV	NO	164117.16+313609.8
16413+3136	STF2084		2019	856	110	1.6	2.95	5.40	G1IV	NO	164117.16+313609.8

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