20490+3947 STF 2731 AB (HD 198436)

20^h 49^m 00.64^s +39° 47' 29.9" P.A. 86.00 sep 4.1 mag 7.65,9.59 Sp B9IV dist. 497.51 pc (1622.88 l.y.)

Coord 2000	20490+3947	Discov num	STF2731	Comp	AB	Coord arcsec 2000	20 49 00.64 +39 47 29.9
Date first	1830	Date last	2016	Obs	26
Pa first	86	Pa last	86.4	P.A. Now (θ)	86.4°
Sep first	4.0	Sep last	4.126	Sep. Now (ρ)	4.126"
Mag pri	7.65	Mag sec	9.59	delta mag (ΔM)	1.94	Spectral class	B9IV (blue-white)
Pri motion ra	+005	Sec motion ra	+005
Pri motion dec	-003	Sec motion dec	-003
Notes

Nature of this double is uncertain.

20490+3947 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 198436	70541	20 49 01 +39 47 30	STF 2731 AB	2016	26	86	4.1	7.65	9.59	1.94		<===
Show		70541	20 49 01 +39 47 30	HO 596 AC	2002	7	178	18.0	7.65	13.64	5.99
Show		70541	20 49 01 +39 47 30	HO 596 AD	2002	8	247	18.2	7.65	13.56	5.91

Quadruple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 198436	Constellation	Cygnus	SAO	70541	HIP	102731
Tycho2	3170-00189-1	Gaia DR2	2065019558668586624	HD	198436	GC	29031
ADS	14334	BD	BD+39 4331	Distance	497.51	Distance ly	1622.88

WDS 20490+3947 STF 2731 AB (HD 198436) : NOTES

No records found.

REFERENCES

refcode	metd	author	reference
Ho_1883	Ma j	Hough, G.W.	1883MNRAS..43..371H
Ho_1883		MNRAS 43, 371, 1883 (data also in Ho_1890)	1890AN....125....1H
Ho_1884	Ma j	Hough, G.W.	1884MNRAS..44..365H
Ho_1884		MNRAS 44, 365, 1884 (data also in Ho_1890)	1890AN....125....1H
Ho_1885	Ma j	Hough, G.W.	1885MNRAS..45..417H
Ho_1885		MNRAS 45, 417, 1885 (data also in Ho_1890)	1890AN....125....1H
Ho_1886	Ma j	Hough, G.W.	1886MNRAS..46..393H
Ho_1886		MNRAS 46, 393, 1886 (data also in Ho_1890)	1890AN....125....1H
Ho_1887	Ma j	Hough, G.W.	1887AN....116..273H
Ho_1887		AN 116, 273, 1887
Ho_1890	Ma j	Hough, G.W.	1890AN....125....1H
Ho_1890		AN 125, 1, 1890
Ho_1890b	Ma j	Hough, G.W.	1890AJ......9..177H
Ho_1890b		AJ 9, 177, 1890 (some data also in Ho_1890 or Ho_1894b)	1890AN....125....1H
Ho_1894a	Ma -	Hough, G.W.	1894MNRAS..54..251H
Ho_1894a		MNRAS 54, 251, 1894
Ho_1894b	Ma j	Hough, G.W. (HO 304 - 490)	1894AN....135..281H
Ho_1894b		AN 135, 281, 1894
Ho_1894c	Ma -	Hough, G.W. (measure by Dembowski, H.)	1894AN....135..281H
Ho_1894c		AN 135, 281, 1894
Ho_1899a	Ma j	Hough, G.W.	1899AN....149..65H
Ho_1899a		AN 149, 65, 1899
Ho_1899b	Ma -	Hough, G.W. (measure by Burnham, S.W.)	1899AN....149..65H
Ho_1899b		AN 149, 65, 1899
Ho_1907	Ma -	Hough, G.W.	1907PFAO....3c...1D
Ho_1907		Pub. Univ. Penn. 3, Pt. 3, 1907 (measures sent to Doolittle)
Ho_1932A	Ma -	Hough, G.W.	1932QB821.A43......
Ho_1932A		cited in ADS, 1932 (unpublished measures sent to Aitken in manuscript by Fox)
STFA		(F. Struve DD - Appendix list #1)	...................
STFB		(F. Struve DD - Appendix list #2)	...................
StF1833A	Ma -	Struve, F.G.W.	1833MmRAS...5...13H
StF1833A	+Mc	cited by Herschel (MemRAS 5, 13, 1833)
StF1833B	Ma -	Struve, F.G.W.	1833AN.....10..389B
StF1833B		cited by Bessel (AN 10, 389, 1833)
StF1837	Ma -	Struve, F.G.W.	1837AN.....14...249
StF1837		Stellarum duplicium et multiplicium mensurae micrometricae...
StF1837		(Dorpat, Academiae scientiarum caesareae petropolitaneifique), 1837
StF1844A	Ma -	Struve, F.G.W.	1844QB43.S66.......
StF1844A		cited by Smyth (Cycle of Celestial Objects 2, 1844)
StF1852A	Ma -	Struve, F.G.W.	.
StF1852A		cited by Bishop (Bishop Obs. Astron. Observations 1852)
StF1865A	Ma -	Struve, F.G.W.	1865AN.....64...81E
StF1865A		cited by Engelmann (AN 64, 81, #1518, 1865)
StF1875A	Ma -	Struve, F.G.W.	1875AN.....85..323D
StF1875A		cited by Doberck, 1875 (see Dob1875b,f,g,h)
StF1878	Ma -	Struve, F.G.W.	.
StF1878		Pulkova Observations 9, 1878
StF1878B	Ma -	Struve, F.G.W.	1878Obs.....2..239G
StF1878B		cited by Gledhill (Obs 2, 239, 1878)
StF1880A	Ma -	Struve, F.G.W.	1880Obs.....3..535G
StF1880A		cited by Gledhill (Obs 3, 535, 1880)
StF1906A	Ma -	Struve, F.G.W.	1906QB821.B972.....
StF1906A		cited in BDS (Burnham Double Star Cat.), 1906
StF1906B	Ma -	Struve, F.G.W.	1906MmRAS..56....1L
StF1906B		cited by Lewis (MemRAS 56, 1, 1906)
StF1922A	Ma -	Struve, F.G.W.	1922AN....216...49R
StF1922A		cited by Rabe (AN 216, 49, 1922)
StF1932A	Ma -	Struve, F.G.W.	1932QB821.A43......
StF1932A		cited in ADS (Aitken Double Star Cat.), 1932
StF2002	- -	Weis, J.
StF2002		F. G. W. Struve's double stars : the Dorpat catalogue; the Pulkovo catalogue
StF2002		USNO Library : QB 821 .S8 W49 2002
StF2022	- -	email note from Jan Weis: 6 July 2022
StF9999	Ma -	Struve, F.G.W.	...................
StF9999		Unpublished, manuscript or reference not found.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20490+3947	STF2731	AB	1999	22	87	4.1	7.65	9.59	B9IV	D	204900.64+394729.9
20490+3947	STF2731	AB	2008	23	86	4.1	7.65	9.59	B9IV	D	204900.64+394729.9
20490+3947	STF2731	AB	2011	25	85	4.2	7.65	9.59	B9IV		204900.64+394729.9
20490+3947	STF2731	AB	2016	26	86	4.1	7.65	9.59	B9IV		204900.64+394729.9

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

WDS 20490+3947 STF 2731 AB (HD 198436) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20490+3947 STF 2731 AB (HD 198436) : MEASURES

No records found.

WDS 20490+3947 (HD 198436) : 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 20490+3947 (HD 198436) : ALADIN DSS IMAGE @ 20^h 49^m 00.64^s +39° 47' 29.9"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20490+3947 STF 2731 AB (HD 198436) : 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		20490+3947	STF2731	AB	86	4.1	1
Show		20490+3947	HO 596	AC	178	18.0	1
Show		20490+3947	HO 596	AD	247	18.2	1
Show		20478+3944	GRV 381		340	35.8	14
Show		20486+4000	TOB 198		96	21.0	15
Show		20481+3958	CVR 231		359	9.7	15
Show		20498+3958	SEI1267		308	3.1	15
Show		20484+4002	SEI1255	AB	338	24.4	17
Show		20484+4002	J 1237	BC	355	5.6	17
Show		20490+3925	TDT2560		38	1.1	23
Show		20493+3923	SEI1263	AB	98	23.6	25
Show		20493+3923	ALI 952	BC	50	4.9	25
Show		20493+3923	DAM 26	BD	53	9.5	25
Show		20514+3945	MLB 779	AB	124	9.0	28
Show		20514+3945	DAM 316	AC	79	6.3	28
Show		20514+3945	DAM 316	AD	304	13.8	28
Show		20515+3944	DAM 317	AB	95	14.8	29
Show		20515+3944	DAM 317	AC	357	15.2	29
Show		20489+3919	TDT2558		191	1.1	29
Show		20480+3917	A 1434	AB	178	0.0	33
Show		20480+3917	A 1434	AB,C	256	2.5	33
Show		20514+3927	TDT2581		146	0.8	35
Show		20488+4024	ALI1192		2	16.5	37
Show		20510+3915	SEI1279	AB	147	12.9	40
Show		20510+3915	SEI1279	BC	189	7.3	40
Show		20520+4009	MLB 955		27	6.6	42
Show		20466+4020	ES 1982		301	3.9	44
Show		20456+4014	TDT2519		347	1.3	48
Show		20531+3940	SEI1292		205	24.8	48
Show		20454+4011	TDT2518		203	0.7	48
Show		20495+4035	COU2426		328	1.2	49
Show		20498+3900	MLB 983		191	3.8	49
Show		20528+3925	SEI1290		222	14.2	49
Show		20453+4010	COU2293		201	1.1	49
Show		20457+3917	SEI1241		309	7.1	50
Show		20519+3911	SEI1283		1	22.8	50
Show		20476+4038	CNT 9		292	9.0	53
Show		20485+4041	ES 1682		152	3.1	54
Show		20454+4023	OSO 133	AB	114	12.0	55
Show		20454+4023	OSO 133	AC	236	11.7	55
Show		20454+4023	OSO 133	AD	67	21.8	55
Show		20454+4023	OSO 133	AE	8	22.4	55
Show		20526+4024	GRV 391		144	59.5	56
Show		20509+3855	SEI1278		135	25.5	57
Show		20445+3921	HJ 1572		280	15.6	59
Show		20461+3858	CRB 11		272	10.8	60
Show		20441+3927	ES 1981		310	4.5	61
Show		20471+3850	HJ 1575		51	14.9	62
Show		20449+3908	SEI1236		318	27.4	63
Show		20438+3928	SEI1230		124	25.3	64
Show		20545+3937	BRT2281		73	3.6	64

WDS 20490+3947 : COMPONENTS

	A	B	C
B	pa=85.3° sep=3.17"
C	pa=178.2° sep=17.96"	pa=188.1° sep=18.39"
D	pa=241.6° sep=14.69"	pa=245.7° sep=17.64"	pa=309.1° sep=17.38"

20490+3947 A

Name	HD 198436	Coord arcsec 2000	204900.64+394729.9	Mag	7.65	Spectral class	B9IV (blue-white)
PmRA	5.00	PmDE	-3.0	SAO	70541	HIP	102731
Tycho2	3170-00189-1	HD	198436	GC	29031	ADS	14334
BD	BD+39 4331

Tycho2

Tycho2	3170-00189-1	Pflag		RAmdeg	312.25264225	DEmdeg	39.79163555
PmRA	-6.7	PmDE	-4.4	E RAmdeg	4	E DEmdeg	4
E pmRA	1.6	E pmDE	1.6	EpRAm	1991.62	EpDEm	1991.62
Num	4	Q RAmdeg	1.8	Q DEmdeg	1.0	Q pmRA	1.7
Q pmDE	1.0	BTmag	7.607	E BTmag	0.015	VTmag	7.651
E VTmag	0.011	Prox	41	TYC	T	HIP	102731
CCDM	A	RAdeg	312.25266250	DEdeg	39.79164583	EpRA 1990	1.69
EpDE 1990	1.69	E RAdeg	4.2	E DEdeg	4.2	Posflg
Corr	0.0

SAO

SAO	70541	DelFlag		RA1950		PmRA1950	0.0011
DE1950		PmDE1950	0.001	Vmag	7.3	SpType	A0
Double code		Source	70	CatNum	29031	DM	BD+39 4331
DMcomp		BDsup		HD	198436	M HD	0
GC	29031	RA1950rad	5.4416516	DE1950rad	0.69124444	PmRA2000	0.0014
PmDE2000	-0.002

Hipparcos

Catalog	H	HIP	102731	Proxy	H	RAhms	20 49 00.64
DEdms	+39 47 29.9	Vmag	7.52	VarFlag		R Vmag	H
RAdeg	312.253	DEdeg	39.7916	AstroRef	A	Plx	2.26
CCDM	20490+3948	N CCDM	I	Nsys	1	Ncomp	2
MultFlag	C	Source		Qual	A	M HIP	AB
Theta	86	Rho	4.127	HD	198436	BD	BD+39 4331
CD		CP		Dm number	+39 4331	VIred	-0.03
SpType	A0...	R SpType		Coord arcsec 2000	204900.64+394729.9

Hipparcos 2

HIP	102731	Sn	15	So	3	Nc	2
RArad	5.4498370161	DErad	0.6944952486	Plx	2.01	PmRA	4.17
PmDE	-2.09	E RArad	0.51	E DErad	0.45	E Plx	0.65
E pmRA	0.5	E pmDE	0.55	Hpmag	7.5303	E Hpmag	0.0013
SHp	0.013	VA	0	BV	-0.003	E BV	0.014
VI	0.02

20490+3947 B

Coord arcsec 2000	204900.91+394730.2		Mag	9.59		PmRA	5.00		PmDE	-3.0
Calc delta mag	1.94		Calc coord	yes

20490+3947 C

Coord arcsec 2000	204900.69+394712.0		Mag	13.64		PmRA	-14.00		PmDE	-13.0
Calc delta mag	5.99		Calc coord	yes

20490+3947 D

Coord arcsec 2000	204859.52+394722.9		Mag	13.56		PmRA	-10.00		PmDE	8.0
Calc delta mag	5.91		Calc coord	yes