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

17146+1423 STF 2140 AB (Rasalgethi)

17^h 14^m 38.86^s +14° 23' 24.9" P.A. 102.00 sep 4.8 mag 3.48,5.40 Sp M5Ib-II dist. 110.25 pc (359.64 l.y.)

Coord 2000	17146+1423	Discov num	STF2140	Comp	AB	Coord arcsec 2000	17 14 38.86 +14 23 24.9
Date first	1779	Date last	2023	Obs	513
Pa first	112	Pa last	102.4	P.A. Now (θ)	102.4°
Sep first	4.8	Sep last	4.79	Sep. Now (ρ)	4.79"
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.

17146+1423 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		102680	17 14 39 +14 23 25	CHR 139 Aa,Ab	1991	3	231	0.2	3.48
Show	Rasalgethi	102680	17 14 39 +14 23 25	STF 2140 AB	2023	513	102	4.8	3.48	5.40	1.92	Y	<===
Show		102680	17 14 39 +14 23 25	AGC 16 AC	2020	10	296	16.6	3.48	15.50	12.02
Show		102680	17 14 39 +14 23 25	STF 2140 AD	2023	15	39	78.1	3.48	11.10	7.62

Quintuple system
5 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Rasalgethi	Var name	Alp Her	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	Bayer greek	α¹ Her

ORBITAL ELEMENTS

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°	Notes	n	Reference	Baz1978
Equinox		Last observation	1970	Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	104.5	4.648
2001	104.4	4.648
2002	104.3	4.647
2003	104.2	4.647
2004	104.1	4.647
2005	104.0	4.646
2006	103.9	4.646
2007	103.8	4.645
2008	103.7	4.645
2009	103.6	4.645
2010	103.6	4.644
2011	103.5	4.644
2012	103.4	4.644
2013	103.3	4.643
2014	103.2	4.643
2015	103.1	4.642
2016	103.0	4.642
2017	102.9	4.641
2018	102.8	4.641
2019	102.7	4.641
2020	102.6	4.640
2021	102.5	4.640
2022	102.4	4.639
2023	102.3	4.639
2024	102.3	4.639
2025	102.2	4.638
2026	102.1	4.638
2027	102.0	4.637
2028	101.9	4.637
2029	101.8	4.636
2030	101.7	4.636
2031	101.6	4.636
2032	101.5	4.635
2033	101.4	4.635
2034	101.3	4.634
2035	101.2	4.634
2036	101.1	4.633
2037	101.0	4.633
2038	101.0	4.632
2039	100.9	4.632
2040	100.8	4.632
2041	100.7	4.631
2042	100.6	4.631
2043	100.5	4.630
2044	100.4	4.630
2045	100.3	4.629
2046	100.2	4.629
2047	100.1	4.628
2048	100.0	4.628
2049	99.9	4.627
2050	99.8	4.627

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

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

WDS 17146+1423 STF 2140 AB (Rasalgethi) : NOTES

discov_num	notes	refcode
STF2140	alp Her = Rasalgethi. Star A is an irregular variable, and B is an
	SB1, P = 51.58 d. Spectrum composite; G5III+F2V. Radial velocity
	measures by Smith (1988 private comm.) for alp Her A since 1984
	have shown an increase in velocity by about 11 km/sec during a
	three-year interval, then an apparent turnover in velocity during
	the fourth year. This suggests a component with a period of the
	order of a decade; it now appears that this system may have at least
	5 physical components. Measure of 1927.43 made by triangulation of
	multiple measures.
	The 1779.66 measure by Herschel was corrected.	H__1804
	Mk III Limb-darkened diameter 36.026 +/- 0.439 mas.	MkT2003
CHR 139	Aa,Ab: A premature orbit has been computed.
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	Radial velocity measures by Smith (1988 private communication) for alp
	Her A since 1984 have shown an increase in velocity by about 11 km/sec
	during a three-year interval, then an apparent turnover in velocity
	during the fourth year. This suggests a component with a period of
	the order of a decade; it now appears that this system may have at
	least five physical components.
	Aa,Ab: Resolved 3 times 1986-1991 at separations 0.16-0.19"
	separations, but unresolved by Balega at the 6-m in 1997 and 10 times	Bag1999a
	1985-1997 at 4m and 2.5m telescopes	Hrt2009
STF2140	AB: H 2 2.	MEv2010

REFERENCES

refcode	metd	author	reference
Bag1999a	S j	Balega, I.I., Balega, Y.Y., Maksimov, A.F., Pluzhnik, E.A., Shkhagosheva, Z.U., &	1999A&AS..140..287B
Bag1999a		Vasyuk, V.A.
Bag1999a		A&AS 140, 287, 1999
Baz1978	orb -	Baize, P.	1978IAUDS..76....1B
Baz1978		Inf. Circ. 76, 1, 1978
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
H__1804	Mb -	Herschel, W.	1804RSPT...94..353H
H__1804		Phil. Trans. R. Soc. 94, 353, 1804
Hrt2009	Su j	Hartkopf, W.I. & Mason, B.D.	2009AJ....138..813H
Hrt2009	+orb	AJ 138, 813, 2009
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT2003	Km -	Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A.,	2003AJ....126.2502M
MkT2003	+not	Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003		AJ 126, 2502, 2003

DISCOVERER

discov	author
AGC	Clark, A.G.
BAG	Balega, I.I., Balega, Y.Y., Belkin, I.N., Maximov, A.F., Orlov, V.G., Pluzhnik,
BAG	E.A., Shkhagosheva, Z.U., & Vasyuk, V.A.
BAG	Balega, I.I., Balega, Yu.Yu., Falcke, H., Osterbart, R., Reinheimer, T., Scholler,
BAG	M., & Weigelt, G.
BAG	Balega, I.I., Balega, Yu.Yu., Hofmann, K.-H., Maksimov, A.F., Pluzhnik, E.A.,
BAG	Schertl, D., Shkhagosheva, Z.U., & Weigelt, G.
BAG	Balega, I.I., Balega, Y.Y., Maksimov, A.F., Pluzhnik, E.A., Schertl, D.,
BAG	Shkhagosheva, Z.U., & Weigelt, G.
BAG	Balega, I.I., Balega, Y.Y., Hofmann, K.-H., Pluzhnik, E.A., Schertl, D.,
BAG	Shkhagosheva, Z.U., & Weigelt, G.
BAG	Balega, I.I., Balega, Y.Y., Hoffmann, K.-H., Malogolovets, E., Schertl, D.,
BAG	Shkhagosheva, Z.U., & Weigelt, G.
BAG	Balega, I.I., Balega, Yu.Yu., Maksimov, A.F., Malogolovets, E.V., Pluzhnik, E.A.,
BAG	& Shkhagosheva, Z.
BAG	Balega, Y.Y., Beuzit, J.-L., Delfosse, X., Forveille, T., Perrier, C., Mayor, M.,
BAG	Segransan, D., Udry, S., et al.
BAG	Balega, I.I., Balega, Yu.Yu., Maksimov, A.F., Malogolovets, E.V., Rastegaev, D.A.,
BAG	Shkhagosheva, Z.U., & Weigelt, G.
BAG	Balega, Yu.Yu., Dyachenko, V.V., Maksimov, A.F., & Malogolovets, E.V.,
BAG	Rastegaev, D.A., & Romanyuk, I.I.
BAG	Balega, Yu.Yu., Dyachenko, V.V., Maksimov, A.F., & Malogolovets, E.V.,
BAG	Rastegaev, D.A., & Romanyuk, I.I.
BAG	Balega, I.I., Balega, Yu.Yu., Gasanova, L.T., Dyachenko, V.V., Maksimov, A.F.,
BAG	Malogolovets, E.V., Rastegaev, D.A., & Shkhagosheva, Z.U.
HRT	Hartkopf, W.I., McAlister, H.A., Mason, B.D., ten Brummelaar, T.A., Roberts, J.C.,
HRT	Jr., Turner, N.H., & Wilson, J.W.
HRT	Hartkopf, W.I., W.I., Mason, B.D., Gies, D.R., ten Brummelaar, T.,
HRT	McAlister, H.A., Moffat, A.F.J., Shara, M.M., & Wallace, D.J.
HRT	Mason, B.D., Martin, C., Hartkopf, W.I., Barry, D.J., Germain, M.E.,
HRT	Douglass, G.G., Worley, C.E., ten Brummelaar, T.A., et al.
HRT	Hartkopf, W.I., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr., Turner, N.H.,
HRT	ten Brummelaar, T.A., Prieto, C.M., Ling, J.F., & Franz, O.G.
HRT	Mason, B.D., Henry, T.J., Soderblom. D.R., Hartkopf, W.I., Holdenreid, E.R.,
HRT	Rafferty, T.J., & Urban, S.E.
MKT	Shao, M., Colavita, M.M., Hines, B.E., Staelin, D.H., Hutter, D.J., Johnston, K.J.,
MKT	Mozurkewich, D., Simon, R.S., Hershey, J.L., Hughes, J.A. & Kaplan, G.H.
MKT	Hutter, D.J., Johnston, K.J., Mozurkewich, D., Simon, R.S., Colavita, M.M., Pan,
MKT	X.P., Shao, M., Hines, B.E., Staelin, D.H., Hershey, J.L., Hughes, J.A. & Kaplan,
MKT	G.H.
MKT	Mozurkewich, D., Johnston, K.J., Simon, R.S., Bowers, P.F., Gaume, R., Hutter,
MKT	D.J., Colavita, M.M., Shao, M. & Pan, X.P.
MKT	Pan, X.P., Shao, M., Colavita, M.M., Armstrong, J.T., Mozurkewich, D.,
MKT	Vivekanand, M., Denison, C.S., Simon, R.S., et al.
MKT	Armstrong, J.T., Mozurkewich, D., Vivekanand, M., Simon, R.S., Denison, C.S.,
MKT	Johnston, K.J., Pan, X.-P., Shao, M., et al.
MKT	Armstrong, J.T., Hummel, C.A., Quirrenbach, A., Buscher, D.F., Mozurkewich, D.,
MKT	Vivekanand, M., Simon, R.S., Denison, C.S., et al.
MKT	Hummel, C.A., Armstrong, J.T., Quirrenbach, A., Buscher, D.F., Mozurkewich, D.,
MKT	Simon, R.S., & Johnston, K.J.
MKT	Hummel, C.A., Armstrong, J.T., Quirrenbach, A., Buscher, D.F., Mozurkewich, D.,
MKT	Elias, N.M., & Wilson, R.E.
MKT	Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A.,
MKT	Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MKT	Armstrong, J.T., Mozurkewich, D., Hajian, A.R., Johnston, K.J., Thessin, R.N.,
MKT	Peterson, D.M., Hummel, C.A., & Gilbreath, G.C.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	dm_number	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
17146+1423	STF2140	AB	2018	501	104	4.8	3.48	5.40	M5Ib-II		NO	171438.86+142324.9
17146+1423	STF2140	AB	2019	505	103	5.0	3.48	5.40	M5Ib-II		NO	171438.86+142324.9
17146+1423	STF2140	AB	2020	511	102	4.9	3.48	5.40	M5Ib-II		NO	171438.86+142324.9
17146+1423	STF2140	AB	2022	514	104	4.9	3.48	5.40	M5Ib-II		NO	171438.86+142324.9
17146+1423	STF2140	AB	2023	512	103	4.7	3.48	5.40	M5Ib-II		NO	171438.86+142324.9

If you need more information about this double, apply for a data request form to the WDS.

WDS 17146+1423 STF 2140 AB (Rasalgethi) : VISUAL OBSERVATIONS REPORTS

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	25/06/12	daedalus1	mean difficulty	separated	103		Beautiful yellow-gold primary, very bright. Companion is pale blue, somewhat subdued.
Show	22/06/29	daedalus1	mean difficulty	separated	103	do not miss it!	Seeing Pickering 5, poor. Measures: theta 103, rho 4.6 +/- 0.516. Very beautiful star system.
Show	22/06/05	oldscope	easy	separated		very interesting	A surprisingly beautiful pair, with enough difference in the magnitudes and colors to warrant periodic visits.
Show	10/06/24	kapp8	very easy	separated		do not miss it!	Bellissima! Forse la mia doppia preferita. E' una stella molto Naif!

WDS 17146+1423 STF 2140 AB (Rasalgethi) : MEASURES

Records found: 2

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	12/06/08	northisup	very easy	4.00		103.00			1
Show	25/06/12	daedalus1	mean difficulty	4.52	0.07	103.00	0.00	1.99	12	Seeing: Pickering 4, poor.

WDS 17146+1423 (Rasalgethi) : VIRTUAL EYEPIECE

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

WDS 17146+1423 (Rasalgethi) : ALADIN DSS IMAGE @ 17^h 14^m 38.86^s +14° 23' 24.9"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 17146+1423 STF 2140 AB (Rasalgethi) : NEIGHBORHOODS

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show	Rasalgethi	17146+1423	CHR 139	Aa,Ab	231	0.2	0
Show	Rasalgethi	17146+1423	STF2140	AB	102	4.8	0
Show	Rasalgethi	17146+1423	AGC 16	AC	296	16.6	0
Show	Rasalgethi	17146+1423	STF2140	AD	39	78.1	0
Show		17166+1440	BU 1200		338	0.6	33
Show		17117+1353	DAM 977	AB	283	8.3	53
Show		17117+1353	DAM 977	BC	45	2.5	53
Show		17155+1332	GWP2699		93	229.2	53
Show		17154+1329	RAO 604		225	0.8	56
Show		17107+1427	BPM 676		242	77.0	57
Show		17118+1338	KPP2297	AB	59	19.3	62
Show		17102+1349	DAM 941		266	2.6	74
Show		17174+1319	HDS2444		284	0.2	77
Show		17164+1303	LDS 990		359	4.4	82
Show		17091+1503	LDS4723		30	1.5	89
Show		17139+1557	STF2137		144	4.1	95
Show		17088+1504	DAM 700		55	11.8	95
Show		17099+1318	DAM 929	AB	336	2.1	95
Show		17099+1318	DAM 929	AC	305	8.0	95
Show		17134+1249	DAM 990	AB	136	25.6	96
Show		17134+1249	DAM 990	BC	32	1.7	97
Show		17093+1326	DAM 912		58	5.2	97
Show		17081+1447	TDT 224		50	1.5	98
Show		17099+1532	DAM 928	AB	134	4.0	98
Show		17099+1532	GKM9368	Aa,Ab	51	0.1	98
Show		17097+1532	DAM 923		47	7.7	100
Show		17150+1238	HDS2439		169	0.5	106
Show		17207+1524	J 452		300	2.8	107
Show		17182+1559	HEI 246		45	1.2	108
Show		17113+1246	JNN 152		162	34.5	110
Show		17126+1609	LDS4725		202	7.5	110
Show		17140+1234	TDT 275		167	2.2	110
Show		17222+1358	BPM 679		20	28.4	114
Show		17080+1322	MMA 39		272	15.4	115
Show		17224+1447	TDT 322		188	1.4	115
Show		17213+1521	J 3252		356	7.7	115
Show		17225+1441	UC 228		225	77.4	115
Show		17140+1621	HO 557		323	4.5	119
Show		17105+1606	GWP2696		16	74.1	119
Show		17231+1454	BU 1284		168	1.9	127
Show		17194+1611	LDS 992		267	6.2	129
Show		17110+1622	HEI 168		65	0.8	129
Show		17099+1229	GWP2692		251	5.6	134
Show		17051+1353	HDS2417		206	0.1	143
Show		17236+1324	BU 46		203	2.2	144
Show		17250+1350	HU 1281	AB	283	1.9	154
Show		17219+1230	HDS2451		81	0.4	156
Show		17252+1355	BPM 680		45	19.1	156
Show		17105+1650	HEI 166		142	3.4	157
Show		17107+1651	HEI 167		99	0.4	158
Show		17044+1330	BPM 674		144	115.5	160

WDS 17146+1423 : COMPONENTS

	A	Ab	B	C
Ab	pa=230.7° sep=0.19"
B	pa=102.4° sep=4.79"	pa=100.6° sep=4.91"
C	pa=295.7° sep=16.56"	pa=296.3° sep=16.48"	pa=292.7° sep=21.25"
D	pa=38.6° sep=78.12"	pa=38.6° sep=78.31"	pa=35.4° sep=76.13"	pa=49.8° sep=83.39"

17146+1423 A

Common name	Rasalgethi	Coord arcsec 2000	171438.86+142324.9	Mag	3.48	Spectral class	M5Ib (red)
PmRA	-17.00	PmDE	47.0	HIP	84345	Tycho2	0990-02133-1
HD	156014	HR	6406	GC	23277	BD	BD+14 3207
Bayer	Alpha 1 Herculis	Bayer name	alp1 Her	Flamsteed	64 Herculis	Flamsteed name	64 Her

Tycho2

Tycho2	0990-02133-1	Pflag		RAmdeg	258.66188627	DEmdeg	14.39036763
PmRA	-17.0	PmDE	47.0	E RAmdeg	4	E DEmdeg	4
E pmRA	2.1	E pmDE	1.9	EpRAm	1991.37	EpDEm	1991.63
Num	3	Q RAmdeg	0.8	Q DEmdeg	0.0	Q pmRA	0.8
Q pmDE	0.1	BTmag	5.077	E BTmag	0.014	VTmag	3.480
E VTmag	0.009	Prox	48	TYC	T	HIP	84345
CCDM	A	RAdeg	258.66192833	DEdeg	14.39025889	EpRA 1990	1.41
EpDE 1990	1.68	E RAdeg	3.8	E DEdeg	3.6	Posflg
Corr	-0.3

Hipparcos

Catalog	H	HIP	84345	Proxy	H	RAhms	17 14 38.86
DEdms	+14 23 24.9	Vmag	2.78	VarFlag	2	R Vmag	H
RAdeg	258.662	DEdeg	14.3903	AstroRef	A	Plx	8.53
CCDM	-6.71	N CCDM	I	Nsys	1	Ncomp	2
MultFlag	C	Source		Qual	D	M HIP	AB
Theta	105	Rho	4.841	HD		BD	BD+14 3207
CD		CP		Dm number	+14 3207	VIred	3.2
SpType	M5IIvar	R SpType		Coord arcsec 2000	171438.86+142324.9

Hipparcos 2

HIP	84345	Sn	15	So	3	Nc	2
RArad	4.5145022838	DErad	0.251157294	Plx	9.07	PmRA	-7.32
PmDE	36.07	E RArad	0.94	E DErad	0.88	E Plx	1.32
E pmRA	0.92	E pmDE	0.97	Hpmag		E Hpmag	0.0189
SHp	0.144	VA	2	BV	1.164	E BV	0.031
VI	1.13

17146+1423 Ab

Coord arcsec 2000

171438.85+142324.8

Spectral class

Delta magnitude

3.48

Coordinate calculated

yes

17146+1423 B

Coord arcsec 2000	171439.18+142323.9		Mag	5.4		Spectral class	II		PmRA	-7.00
PmDE	33.0		Delta magnitude	1.92		Coordinate calculated	yes

17146+1423 C

Coord arcsec 2000	171437.83+142332.1		Mag	15.5		Spectral class	II		Delta magnitude	12.02
Coordinate calculated	yes

17146+1423 D

Coord arcsec 2000	171442.21+142426.0		Mag	11.1		Spectral class	II		PmRA	3.00
PmDE	-42.0		Delta magnitude	7.62		Coordinate calculated	yes