18281-2048 RSS 32 (HD 169991)

18^h 28^m 08.47^s -20° 48' 06.8" P.A. 223.00 sep 45.7 mag 8.94,9.85 Sp B9II dist. 2777.78 pc (9061.12 l.y.)

Coord 2000	18281-2048	Discov num	RSS 32	Comp		Coord arcsec 2000	18 28 08.47 -20 48 06.8
Date first	1894	Date last	2017	Obs	13
Pa first	224	Pa last	223.1	P.A. Now (θ)	223.1°
Sep first	45.4	Sep last	45.654	Sep. Now (ρ)	45.654"
Mag pri	8.94	Mag sec	9.85	delta mag (ΔM)	0.91	Spectral class	B9II (blue-white)
Pri motion ra	-003	Sec motion ra	-001
Pri motion dec	-007	Sec motion dec	-003
Notes	N (See Notes)

rPM=0.587

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 169991	Constellation	Sagittarius	SAO	186850	HIP	90508
Tycho2	6278-01671-1	Gaia DR2	4090393850533483648	HD	169991	BD	BD-20 5146
Distance	2777.78	Distance ly	9061.12

WDS 18281-2048 RSS 32 (HD 169991) : NOTES

discov_num	notes	refcode
RSS 32	This previously uncataloged double star was a Hipparcos double entry
	system. The first measure is determinedfrom the individual positions
	listed by Rousseau et al.	Rss1996

REFERENCES

refcode	metd	author	reference
Rss1996	Pa -	Rousseau, J.M., Perie, J.P., & Gachard, M.T.	1996A&AS..116..301R
Rss1996		A&AS 116, 301, 1996

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18281-2048	RSS 32		1998	9	223	45.8	8.94	9.85	B9II	N D	182808.47-204806.8
18281-2048	RSS 32		1999	11	223	45.7	8.94	9.85	B9II	N D	182808.47-204806.8
18281-2048	RSS 32		2010	11	223	45.7	8.94	9.85	B9II	N	182808.47-204806.8
18281-2048	RSS 32		2017	12	224	45.7	8.94	9.85	B9II	N	182808.47-204806.8

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

WDS 18281-2048 RSS 32 (HD 169991) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 18281-2048 RSS 32 (HD 169991) : MEASURES

No records found.

WDS 18281-2048 (HD 169991) : 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 18281-2048 (HD 169991) : ALADIN DSS IMAGE @ 18^h 28^m 08.47^s -20° 48' 06.8"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 18281-2048 RSS 32 (HD 169991) : 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		18281-2048	RSS 32		223	45.7
Show		18278-2052	ARA1151		40	16.1	7
Show		18282-2114	HJ 2832		21	23.1	27
Show		18259-2053	BRT1537		284	3.4	33
Show		18264-2111	ARA1534		270	13.2	34
Show		18289-2122	HU 241	AB	34	4.1	36
Show		18289-2122	HU 241	AC	301	63.0	36
Show		18257-2102	HLD 144	AB	42	2.8	38
Show		18257-2102	HLD 144	AC	281	68.8	38
Show		18257-2102	HLD 144	CD	159	7.5	39
Show		18261-2019	SKF 101		35	2.9	41
Show		18254-2033	JC 6		280	1.7	43
Show		18280-2135	HU 240		35	4.7	48
Show		18288-2138	HU 242		279	1.2	51
Show		18273-2140	HU 239		185	3.1	53
Show		18296-2138	ARA1536		147	15.5	55
Show		18302-2135	ARA1537		77	13.4	56
Show		18321-2040	ARA1152		134	14.5	56
Show		18306-2133	ARA1538		255	9.4	58
Show		18314-2124	ARA1539		4	5.0	59
Show		18247-2012	OCC 409		-1	0.0	61
Show		18258-1953	ARA 750		112	3.6	65
Show		18273-2154	ARA1535		38	11.4	68
Show		18315-2138	ARA1540		10	14.8	69
Show		18254-2146	ARA1533		336	13.3	70
Show		18328-2022	KPP 416		159	4.9	71
Show		18239-2129	BRT1535		307	4.5	73
Show		18230-2115	ARA1529		307	11.8	77
Show		18236-2133	RST5112		25	0.3	78
Show		18337-2048	ARA1154		288	7.2	78
Show		18324-2138	ARA1541		349	7.1	79
Show		18239-2139	BRT1536		71	3.5	79
Show		18336-2030	DON 911		348	2.1	79
Show		18246-1944	OCC 459		-1	2.5	81
Show		18231-2009	DON 897		129	1.6	82
Show		18338-2119	ARA1543		253	8.5	85
Show		18234-2143	ARA1530		101	14.5	86
Show		18333-2003	ARA1153		295	12.5	86
Show		18223-2018	BHA 27		236	7.0	86
Show		18337-2132	ARA1542		114	11.6	90
Show		18242-1935	BU 49	AB	45	8.2	93
Show		18242-1935	BU 49	AC	304	22.4	93
Show		18242-1935	BU 49	AD	149	23.4	93
Show		18216-2052	BRT1530		337	5.5	94
Show		18237-1936	ARA 746		280	12.9	96
Show		18317-2211	ARA1890		289	11.5	97
Show		18258-2220	ARA1887		187	6.0	97
Show		18238-1930	LEO 16		84	1.2	99
Show		18282-2227	ARA1889		9	9.0	100
Show		18281-2228	ARA1888		250	13.7	100
Show		18237-2209	BRT1534		117	4.7	102

WDS 18281-2048 : COMPONENTS

	A
B	pa=221.2° sep=44.29"

18281-2048 A

Componente originario normalizzato	AB	Name	HD 170015	Coord arcsec 2000	182808.47-204806.8	Mag	8.94
Spectral class	B9II (blue-white)	PmRA	-3.00	PmDE	-7.0	HIP	90515
Tycho2	6278-01671-1	HD	170015	BD	BD-20 5147

Tycho2

Tycho2	6278-01671-1	Pflag		RAmdeg	277.03530001	DEmdeg	-20.80189579
PmRA	-4.8	PmDE	-7.1	E RAmdeg	10	E DEmdeg	12
E pmRA	1.5	E pmDE	1.5	EpRAm	1989.71	EpDEm	1989.24
Num	8	Q RAmdeg	0.8	Q DEmdeg	1.0	Q pmRA	0.7
Q pmDE	1.0	BTmag	9.062	E BTmag	0.021	VTmag	8.938
E VTmag	0.021	Prox	457	TYC	T	HIP	90515
CCDM		RAdeg	277.03531111	DEdeg	-20.80187861	EpRA 1990	1.65
EpDE 1990	1.59	E RAdeg	10.5	E DEdeg	12.7	Posflg
Corr	0.1

Hipparcos

Catalog	H	HIP	90515	Proxy		RAhms	18 28 08.48
DEdms	-20 48 06.8	Vmag	8.9	VarFlag		R Vmag	H
RAdeg	277.035	DEdeg	-20.8019	AstroRef		Plx	1.92
CCDM	18281-2048	N CCDM	I	Nsys	2	Ncomp	1
MultFlag		Source		Qual		M HIP
Theta		Rho		HD	170015	BD	BD-20 5147
CD		CP		Dm number	-20 5147	VIred	0.09
SpType	B9II	R SpType		Coord arcsec 2000	182808.48-204806.8

Hipparcos 2

HIP	90515	Sn	5	So	0	Nc	1
RArad	4.8351783687	DErad	-0.3630612287	Plx	3.43	PmRA	-2.35
PmDE	-9.29	E RArad	1.65	E DErad	1.07	E Plx	1.65
E pmRA	2.07	E pmDE	1.38	Hpmag	8.9453	E Hpmag	0.0049
SHp	0.025	VA	0	BV	0.134	E BV	0.038
VI	0.15

CCDM

Ccdm	18281-2048	RComp		Comp	A	Note1
Note2		Discov num		DRAs	2.48	DDEs	-6.9
R dRAs	40	Year		Theta		Rho
Obs	2	Vmag	8.9	Sp	B9	PmNote
PmRA		PmDE		Dm number	-20 5147	Cat1	BD
Name2		Cat2		HD	170015	M HD
ADS BDS		M ADS BDS		N IDS	*	IDS	18222S2052A
HIC	90515

18281-2048 B

Componente originario normalizzato	AB	Coord arcsec 2000	182806.39-204840.1	Mag	9.85	PmRA	-1.00
PmDE	-3.0	SAO	186850	HIP	90508	Tycho2	6278-01733-1
HD	169991	BD	BD-20 5146	Calc delta mag	0.91	Calc coord	yes

Tycho2

Tycho2	6278-01733-1	Pflag		RAmdeg	277.02598870	DEmdeg	-20.81112421
PmRA	-2.4	PmDE	-4.0	E RAmdeg	20	E DEmdeg	23
E pmRA	1.8	E pmDE	1.7	EpRAm	1987.58	EpDEm	1984.21
Num	6	Q RAmdeg	0.8	Q DEmdeg	0.8	Q pmRA	0.7
Q pmDE	0.8	BTmag	10.032	E BTmag	0.037	VTmag	9.851
E VTmag	0.043	Prox	457	TYC	T	HIP	90508
CCDM		RAdeg	277.02599611	DEdeg	-20.81111444	EpRA 1990	1.68
EpDE 1990	1.61	E RAdeg	22.3	E DEdeg	27.7	Posflg
Corr	0.2

SAO

SAO	186850	DelFlag		RA1950		PmRA1950	-0.0011
DE1950		PmDE1950	0.002	Vmag	8.9	SpType	A
Double code		Source	23	CatNum	7709	DM	BD-20 5146
DMcomp		BDsup		HD	169991	M HD	0
GC		RA1950rad	4.82199359	DE1950rad	-0.36378467	PmRA2000	-0.0011
PmDE2000	0.003

Hipparcos

Catalog	H	HIP	90508	Proxy		RAhms	18 28 06.24
DEdms	-20 48 40.0	Vmag	9.84	VarFlag		R Vmag	H
RAdeg	277.026	DEdeg	-20.8111	AstroRef		Plx	-1.64
CCDM	18281-2048	N CCDM	I	Nsys	2	Ncomp	1
MultFlag		Source		Qual		M HIP
Theta		Rho		HD	169991	BD	BD-20 5146
CD		CP		Dm number	-20 5146	VIred	0.67
SpType	B8/B9II/III	R SpType		Coord arcsec 2000	182806.24-204840.0

Hipparcos 2

HIP	90508	Sn	5	So	0	Nc	1
RArad	4.8350156193	DErad	-0.3632225056	Plx	-0.36	PmRA	-6.35
PmDE	-5.56	E RArad	2.39	E DErad	1.53	E Plx	2.43
E pmRA	3.19	E pmDE	2.21	Hpmag	9.892	E Hpmag	0.0064
SHp	0.034	VA	0	BV	0.156	E BV	0.072
VI	0.17

CCDM

Ccdm	18281-2048	RComp		Comp	B	Note1
Note2		Discov num	RSU	DRAs	0.18	DDEs	-39.9
R dRAs	40	Year	1977	Theta	224	Rho	45.7
Obs	1	Vmag	9.4	Sp	A	PmNote	*
PmRA	-15	PmDE	2	Dm number	-20 5146	Cat1	BD
Name2	186850	Cat2	SAO	HD	169991	M HD
ADS BDS		M ADS BDS		N IDS	*	IDS	18222S2052B
HIC	90508