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18168-1631
SNA 84 AB

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

18168-1631 SNA 84 AB

18^h 16^m 49.65^s -16° 31' 04.3" P.A. 117.00 sep 5.1 mag 7.35,12.94 Sp O6.5V dist. 649.35 pc (2118.18 l.y.)

Coord 2000	18168-1631		Discov num	SNA 84		Comp	AB		Coord arcsec 2000	18 16 49.65 -16 31 04.3
Date first	2012		Date last	2012		Obs	1
Pa first	117		Pa last	117.4		P.A. Now (θ)	117.4°
Sep first	5.1		Sep last	5.06		Sep. Now (ρ)	5.06"
Mag pri	7.35		Mag sec	12.94		delta mag (ΔM)	5.59		Spectral class	O6.5V (blue)
Pri motion ra	+001		Sec motion ra
Pri motion dec	-003		Sec motion dec
Notes	N K (See Notes, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes

Nature of this double is uncertain.

18168-1631 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		161251	18 16 50 -16 31 04	SNA 84 AB	2012	1	117	5.1	7.35	12.94	5.59		<===
Show	HD 167633	161251	18 16 50 -16 31 04	SNA 84 AC	2015	3	199	5.5	7.35	10.62	3.27
Show		161251	18 16 50 -16 31 04	SNA 84 AD	2015	3	261	6.8	7.35	13.07	5.72

Quadruple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Sagittarius		SAO	161251		HIP	89584		Tycho2	6265-02178-1
Gaia DR2	4097600496363078912		HD	167633		BD	BD-16 4786		Distance	649.35
Distance ly	2118.18

WDS 18168-1631 SNA 84 AB : NOTES

discov_num	notes	refcode
SNA 84	We detect three previously unreported distant companions in the NACO
	FOV, but lack PIONIER observations to investigate possible closer
	companions. The object was reported as SB1? by Abt et al. (1972), a	AbH1972b
	fact not confirmed by Chini et al. (2012), who prefer a RV stable	Cii2012
	classification.	Sna2014
HD 167633	LS 4864. Additional radial velocities are reported by Crampton &
	Fisher (1974 Pub DAO 14, 283). The star appears within the boundaries
	and at the same distance of Ser OB1 in the LSC.	Msn1998a

REFERENCES

refcode	metd	author	reference
AbH1972b	not -	Abt. H.A., Levy, S.G., & Gandet, T.L.	1972AJ.....77..138A
AbH1972b		AJ 77, 138, 1972
Cii2012	not -	Chini, R., Hoffmeister, V.H., Nasseri, A., Stahl, O., & Zinnecker, H.	2012MNRAS.424.1925C
Cii2012		MNRAS 424, 1925, 2012
Msn1998a	Sc j	Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G.,	1998AJ....115..821M
Msn1998a		ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a		AJ 115, 821, 1998
Sna2014	Kv j	Sana, H., LeBouquin, J.-B., Lacour, S., Berger, J.-P., Duvert, G., Gauchet, L.,	2014ApJS..215...15S
Sna2014	+A	Norris, B., Olofsson, J., Pickel, D., Zins, G., Absil, O., de Koter, A.,
Sna2014		Kratter, K., Schnurr, O., & Zinnecker, H.
Sna2014		ApJS 215, 15, 2014
Sna2014		(NACO companions in Table 6 assumed physical if quoted probability of spurious
Sna2014		detection <10%, optical if >90%, otherwise indeterminate)

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18168-1631	SNA 84	AB	2012	1	117	5.1	7.35	12.94	O6.5V	N K	181649.65-163104.3

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

WDS 18168-1631 SNA 84 AB : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 18168-1631 SNA 84 AB : MEASURES

No records found.

WDS 18168-1631 : VIRTUAL EYEPIECE

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 18168-1631 : ALADIN DSS IMAGE @ 18^h 16^m 49.65^s -16° 31' 04.3"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 18168-1631 SNA 84 AB : NEIGHBORHOODS

grafico limitrofi

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		18168-1631	SNA 84	AB	117	5.1
Show		18168-1631	SNA 84	AC	199	5.5
Show		18168-1631	SNA 84	AD	261	6.8
Show		18168-1622	J 1650		249	4.5	9
Show		18174-1639	TOB 279		194	13.2	12
Show		18175-1639	TOB 280		290	14.9	13
Show		18175-1638	HJ 2829	AB	320	5.0	13
Show		18175-1638	HJ 2829	AC	167	6.3	13
Show		18167-1649	TOB 278	AB	108	25.7	18
Show		18167-1649	TOB 278	BC	113	17.2	19
Show		18165-1652	HJ 2826	AB	257	8.9	20
Show		18165-1652	DAM 104	AC	55	5.5	20
Show		18165-1652	WFC 290	AD	204	5.3	20
Show		18154-1622	J 1649		337	3.4	22
Show		18177-1611	ARA 102		95	10.6	24
Show		18177-1652	BU 463		103	2.0	24
Show		18169-1656	ADP 1		47	4.5	25
Show		18196-1630	WRH 10	AB	296	6.1	26
Show		18196-1630	WRH 10	AC	153	37.5	26
Show		18172-1656	ADP 3		180	3.4	26
Show		18154-1648	HJ 2824		74	21.9	27
Show		18187-1631	TOB 281		80	21.3	27
Show		18171-1700	WSI 143		75	25.8	29
Show		18170-1700	ADP 2		298	5.3	30
Show		18157-1658	FOX 223		325	5.6	32
Show		18156-1602	AOT 72		348	8.4	35
Show		18143-1631	J 1648		90	6.2	36
Show		18159-1706	FOX 224		42	6.5	38
Show		18194-1618	BRT 628		319	4.4	40
Show		18158-1554	RST4005		313	0.4	40
Show		18195-1647	TOB 284	AB	178	13.3	42
Show		18195-1647	TOB 284	AC	63	20.0	42
Show		18160-1713	ARA 273		271	8.7	44
Show		18170-1548	J 2513		274	4.0	44
Show		18196-1601	OL 13		176	4.6	46
Show		18201-1631	TDT 802		349	1.8	48
Show		18197-1655	TOB 285		194	19.4	49
Show		18196-1600	DAM 106		340	5.8	51
Show		18204-1630	TOB 287		196	14.5	53
Show		18199-1704	SMY9003		134	24.8	56
Show		18178-1537	J 2205	AB	100	4.6	56
Show		18178-1537	J 2205	AC	47	13.9	56
Show		18128-1618	HJ 2821	AB	278	7.8	60
Show		18128-1618	BU 1463	AC	12	53.1	60
Show		18210-1633	BRT 630		354	5.5	60
Show		18202-1707	TDT 803		195	0.7	61
Show		18190-1724	TVB 301		184	7.2	62
Show		18169-1734	SKF 98		243	4.0	63
Show		18205-1706	TDT 806		101	0.5	64
Show		18213-1622	FGS 31		202	1.1	66
Show		18158-1527	SKF2388		48	12.2	66

WDS 18168-1631 : COMPONENTS

	A	B	C
B	pa=118.4° sep=4.90"
C	pa=198.5° sep=5.48"	pa=244.6° sep=6.69"
D	pa=260.2° sep=6.52"	pa=276.5° sep=10.80"	pa=311.0° sep=6.22"

18168-1631 A

Coord arcsec 2000	181649.65-163104.3		Mag	7.35		Spectral class	O6.5V (blue)		PmRA	1.00
PmDE	-3.0		SAO	161251		HIP	89584		Tycho2	6265-02178-1
HD	167633		BD	BD-16 4786

Tycho2

Tycho2	6265-02178-1		Pflag			RAmdeg	274.20690042		DEmdeg	-16.51785986
PmRA	0.0		PmDE	0.2		E RAmdeg	6		E DEmdeg	8
E pmRA	1.2		E pmDE	1.3		EpRAm	1990.89		EpDEm	1990.53
Num	13		Q RAmdeg	0.7		Q DEmdeg	1.5		Q pmRA	0.7
Q pmDE	1.5		BTmag	8.389		E BTmag	0.018		VTmag	8.206
E VTmag	0.014		Prox	999		TYC	T		HIP	89584
CCDM			RAdeg	274.20690028		DEdeg	-16.51786083		EpRA 1990	1.79
EpDE 1990	1.72		E RAdeg	5.9		E DEdeg	8.0		Posflg
Corr	0.1

SAO

SAO	161251		DelFlag			RA1950			PmRA1950	-0.001
DE1950			PmDE1950	-0.004		Vmag	8.8		SpType	Oe5
Double code			Source	21		CatNum	6635		DM	BD-16 4786
DMcomp			BDsup			HD	167633		M HD	0
GC			RA1950rad	4.77319088		DE1950rad	-0.2886173		PmRA2000	-0.0008
PmDE2000	-0.003

Hipparcos

Catalog	H		HIP	89584		Proxy			RAhms	18 16 49.65
DEdms	-16 31 04.3		Vmag	8.13		VarFlag			R Vmag	G
RAdeg	274.207		DEdeg	-16.5179		AstroRef			Plx	2.21
CCDM			N CCDM			Nsys			Ncomp	1
MultFlag			Source			Qual			M HIP
Theta			Rho			HD	167633		BD	BD-16 4786
CD			CP			Dm number	-16 4786		VIred	0.32
SpType	O6		R SpType			Coord arcsec 2000	181649.65-163104.3

Hipparcos 2

HIP	89584		Sn	5		So	0		Nc	1
RArad	4.7858131505		DErad	-0.2882910187		Plx	1.54		PmRA	0.93
PmDE	-2.52		E RArad	0.94		E DErad	0.44		E Plx	1.03
E pmRA	0.93		E pmDE	0.51		Hpmag	8.2018		E Hpmag	0.0013
SHp	0.009		VA	0		BV	0.2		E BV	0.02
VI	0.22

18168-1631 B

Coord arcsec 2000

181649.95-163106.6

Mag

12.94

Calc delta mag

5.59

Calc coord

yes

18168-1631 C

Coord arcsec 2000

181649.53-163109.5

Mag

10.62

Calc delta mag

3.27

Calc coord

yes

18168-1631 D

Coord arcsec 2000

181649.20-163105.4

Mag

13.07

Calc delta mag

5.72

Calc coord

yes