16044-1122 STF 1998 AC

16^h 04^m 22.13^s -11° 22' 23.2" P.A. 45.00 sep 7.2 mag 4.84,7.30 Sp F5IV+G1V

Coord 2000	16044-1122	Discov num	STF1998	Comp	AC	Coord arcsec 2000	16 04 22.13 -11 22 23.2
Date first	1780	Date last	2019	Obs	389
Pa first	91	Pa last	44.6	P.A. Now (θ)	44.6°
Sep first	6.4	Sep last	7.15	Sep. Now (ρ)	7.15"
Mag pri	4.84	Mag sec	7.30	delta mag (ΔM)	2.46	Spectral class	F5IV+G1V (yellow-white/yellow)
Pri motion ra	-074	Sec motion ra	-075
Pri motion dec	-033	Sec motion dec	-012
Notes	N O (See Notes, Orbital solution)

rPM=0.259 (< 0.3, Physical double)

This double is physical.

16044-1122 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Xi Sco	159665	16 04 22 -11 22 23	STF 1998 AB	2020	630	12	1.2	4.84	4.86	0.02	Y
Show		159665	16 04 22 -11 22 23	STF 1998 AC	2019	389	45	7.2	4.84	7.30	2.46	Y	<===
Show		159665	16 04 22 -11 22 20	STF 1998 BC	2019	79	38	8.8	4.86	7.30	2.44

Triple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Scorpius	SAO	159665	HIP	78727	Tycho2	5619-01257-1
Gaia DR2	4343066192367555200	HD	144069	HR	5977	GC	21593
ADS	9909	BD	BD-10 4237	Bayer	Xi Scorpii	Bayer name	Xi Sco
Bayer greek	ξ Sco

ORBITAL ELEMENTS

Period (P)	1514.43y	Periastron (T)	2226.1y	Semi-major axis (a)	7.755a
Eccentricity (e)	0.041	Inclination (i)	131.5°	Longitude of periastron (ω)	59.3°
Node (Ω)	47.4°	Notes	n	Reference	Zir2008
Equinox	2000	Last observation	2005	Grade	5	(1=Definitive, 9=Indet.)

label	theta	rho
2000	46.3	7.574
2001	46.1	7.572
2002	46.0	7.571
2003	45.8	7.569
2004	45.6	7.567
2005	45.5	7.565
2006	45.3	7.563
2007	45.2	7.561
2008	45.0	7.558
2009	44.8	7.556
2010	44.7	7.554
2011	44.5	7.551
2012	44.3	7.549
2013	44.2	7.546
2014	44.0	7.543
2015	43.8	7.541
2016	43.7	7.538
2017	43.5	7.535
2018	43.3	7.532
2019	43.2	7.529
2020	43.0	7.526
2021	42.8	7.522
2022	42.7	7.519
2023	42.5	7.516
2024	42.3	7.512
2025	42.2	7.509
2026	42.0	7.505
2027	41.8	7.502
2028	41.6	7.498
2029	41.5	7.494
2030	41.3	7.490

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

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

WDS 16044-1122 STF 1998 AC : NOTES

discov_num	notes	refcode
STF1998	51 Lib = xi Sco. Quintuple.
	AB: Mt. Wilson spectral type F3s.
	Masses and bolometric magnitudes are derived for the two components
	of this system by Mason et al. (1999), based on assumed spectral types	Msn1999a
	and available parallaxes.
	AB: H 1 33. AC: H 2 20.	MEv2010
	AB,C triple solution by Soderhjelm (1999). (Failed HIP solution due to	Sod1999
	bad pointing with C comp at IFOV edge).
	Star C (mag. 7.30, 7", G1V) is in retrograde motion, and ADS 9910
	(mags. 7.4-8.0, 11", dG6) is 281" distant and shares proper motion.
	Appears to be a common proper motion pair associated with RST3949	Tok2010b
	(16278-0822).
	AC: Additional notes may be found in Fatou (1941).	Fat1941
	Mass = 1.53, 1.53, 1.00 \msun for A, B, C, respectively.	Tok2020d
	Teff = 6532, 6532, 5705 K for A, B, C, respectively.
	Physical quintuple with 16044-1127STF1999AB with P ~ 300 kyr.

REFERENCES

refcode	metd	author	reference
Fat1941	Ma -	Fatou, P.	1941JO.....24...29F
Fat1941		J. Obs. 24, 29, 1941
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Msn1999a	Su j	Mason, B.D., Douglass, G.G., & Hartkopf, W.I.	1999AJ....117.1023M
Msn1999a	+orb	AJ 117, 1023, 1999
Sod1999	orb -	Soderhjelm, S.	1999A&A...341..121S
Sod1999		A&A 341, 121, 1999
Tok2010b	S -	Tokovinin, A.	...................
Tok2010b		private communication
Tok2020d	orb j	Tokovinin, A.	2020AJ....159..265T
Tok2020d		AJ 159, 265, 2020
Zir2008	orb -	Zirm, H.	2008IAUDS.166....1Z
Zir2008		Inf. Circ. 166, 1, 2008

DISCOVERER

idgroup	discov	author
1	STF	Struve, F.G.W.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16044-1122	STF1998	AC	2005	366	41	7.9	4.90	7.30	G1V	NO	160421.63-112224.8
16044-1122	STF1998	AC	2009	369	42	7.9	4.90	7.30	G1V	NO	160421.63-112224.8
16044-1122	STF1998	AC	2012	379	47	6.9	5.16	7.30	G1V	NO	160421.63-112224.8
16044-1122	STF1998	AC	2014	381	48	7.0	5.16	7.30	G1V	NOD	160421.63-112224.8
16044-1122	STF1998	AC	2016	384	45	7.6	5.16	7.30	G1V	NO	160422.13-112223.2
16044-1122	STF1998	AC	2018	386	43	7.7	5.16	7.30	G1V	NO	160422.13-112223.2
16044-1122	STF1998	AC	2019	388	45	7.2	4.84	7.30	F5IV+G1V	NO	160422.13-112223.2

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

WDS 16044-1122 STF 1998 AC : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 16044-1122 STF 1998 AC : MEASURES

No records found.

WDS 16044-1122 : 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 16044-1122 : ALADIN DSS IMAGE @ 16^h 04^m 22.13^s -11° 22' 23.2"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 16044-1122 STF 1998 AC : 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		16044-1122	STF1998	AB	12	1.2
Show		16044-1122	STF1998	AC	45	7.2
Show		16044-1122	STF1998	BC	38	8.8	1
Show		16044-1127	STF1999	AB	98	11.9	5
Show		16044-1127	STF1999	AD	351	278.5	5
Show		16044-1127	STF1999	AC	85	84.5	5
Show		16044-1127	STF1999	BC	82	73.0	5
Show		16030-1125	KPP1937		48	15.3	21
Show		16020-1118	HDS2261		31	0.1	36
Show		16071-1110	KPP1054		40	8.4	42
Show		16077-1103	BWL 42		149	0.7	53
Show		16077-1155	LSC 62		255	0.2	60
Show		16006-1059	GWP2574		92	73.5	61
Show		16047-1014	LDS4628		343	50.2	68
Show		16026-1230	HDS2263		225	0.1	73
Show		16092-1057	HDS2279		326	0.3	76
Show		15597-1048	FAL 51		257	15.5	78
Show		16035-1247	UC 3109		66	50.1	86
Show		16076-1245	BU 39	AB	259	3.3	96
Show		16076-1245	BU 39	AC	321	29.5	96
Show		16085-1006	BU 949		45	0.0	98
Show		16090-1239	UC 3124		241	62.4	103
Show		16086-1245	HU 155		255	0.8	104
Show		16109-1204	HU 156		84	2.9	105
Show		16073-1309	KPP2778		1	4.2	116
Show		16031-1321	GWP2581		19	14.0	120
Show		16084-1308	GIC 139	AB		15.1	122
Show		16109-1006	WRH 24		87	0.2	124
Show		16090-0939	WSI 85		321	0.1	125
Show		16129-1052	KPP2445		165	21.5	129
Show		16038-1345	UC 3113			42.0	144
Show		16140-1152	RST3935		137	1.8	146
Show		16138-1034	CLL 10		181	57.7	147
Show		15542-1134	KPP1299		5	9.9	150
Show		16045-0851	A 2591		5	2.9	151
Show		15542-1152	UC 3085		141	28.8	153
Show		15584-0916	GWP2566		348	134.4	155
Show		15583-0913	TSN 93		168	134.4	157
Show		16143-1025	RST3936	AB	269	0.3	157
Show		16143-1025	STF2019	AB,C	153	22.3	157
Show		15539-1039	GWP2560		40	119.5	161
Show		15581-0908	GIC 137		114	10.9	164
Show		16071-1404	NSN 153		259	36.9	167
Show		16127-1319	SKF 440	AB	130	8.6	169
Show		15549-0945	KPP 659		319	5.9	171
Show		16105-0857	GWP2605		333	14.8	172
Show		16036-1417	TVB 283		142	21.8	175
Show		15542-0945	OCC9008		-1	7.0	180
Show		16072-1418	UC 3120		131	46.1	180
Show		15545-1311	LDS4599		69	158.3	181
Show		16072-1424	LDS4631		36	59.4	187

WDS 16044-1122 : COMPONENTS

	A	B
B	pa=8.4° sep=3.03"
C	pa=44.0° sep=7.08"	pa=65.0° sep=4.94"

16044-1122 A

Name	Xi Sco	Coord arcsec 2000	160422.13-112223.2	Mag	4.84	Spectral class	F5IV (yellow-white)
PmRA	-74.00	PmDE	-33.0	ADS	9909	DM	BD-10 4237
Bayer	Xi	Bayer name	Xi

16044-1122 B

Coord arcsec 2000	160422.16-112220.2	Coord calc	160422.16-112220.2	Mag	4.86	Spectral class	F5IV (yellow-white)
PmRA	-42.00	PmDE	-19.0	SAO	159665	HD	144069
HR	5978	ADS	9909	DM	BD-10 4237	Calc delta mag	0.02

SAO

SAO	159665	DelFlag		RA1950		PmRA1950	-0.0043
DE1950		PmDE1950	-0.033	Vmag	4.2	SpType	F8
Double code		Source	70	CatNum	21593	DM	BD-10 4237
DMcomp	A	BDsup		HD	144069	M HD	9
GC	21593	RA1950rad	4.19583614	DE1950rad	-0.19611819	PmRA2000	-0.0041
PmDE2000	-0.029

16044-1122 C

Coord arcsec 2000	160422.46-112218.1		Mag	7.3		Spectral class	G1V (yellow)		PmRA	-75.00
PmDE	-12.0		Calc delta mag	2.46		Calc coord	yes