20440+4030 SLN 85

20^h 44^m 01.03^s +40° 30' 14.4" P.A. 203.00 sep 9.1 mag 15.30,17.90 Sp DA+DAH

Coord 2000	20440+4030	Discov num	SLN 85	Comp		Coord arcsec 2000	20 44 01.03 +40 30 14.4
Date first	1998	Date last	2016	Obs	7
Pa first	203	Pa last	203	P.A. Now (θ)	203°
Sep first	9.3	Sep last	9.07	Sep. Now (ρ)	9.07"
Mag pri	15.30	Mag sec	17.90	delta mag (ΔM)	2.6	Spectral class	DA+DAH (white dwarf/white dwarf)
Pri motion ra	+019	Sec motion ra
Pri motion dec	+047	Sec motion dec
Notes	V (Proper motion indicates physical)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Gaia DR2

2066035777984385664

WDS 20440+4030 SLN 85 : NOTES

No records found.

REFERENCES

refcode	metd	author	reference
SLN		Sloan Digital Sky Survey	...................
Sln2009	Es j	Abazajian, K.N., Adelman-McCarthy, J.K., Agueros, M.A., Allam, S.S.,	2009ApJS..182..543A
Sln2009		Allende Prieto, C., An, D., Anderson, K.S.J., Anderson, S.F., Annis J.,
Sln2009		Bahcall, N.A., Bailer-Jones, C.A.L., Barentine, J.C., et al.
Sln2009		ApJS 182, 543, 2009 (The SDSS Photometric Catalog, Release 7)
Sln2012	Es -	Ahn C.P., Alexandroff R., Allende Prieto C., Anderson S.F., Anderton T.,	2012ApJS..203...21A
Sln2012		Andrews B.H., Aubourg E., Bailey S., Balbinot E., Barnes R., Bautista J.,
Sln2012		Beers T.C., et al.
Sln2012		ApJS 203, 21, 2012 (The SDSS Photometric Catalog, Release 9)
Sln2014	Es -	Baxter, R.B., Dobbie, P.D., Parker, Q.A., Casewell, S.L., Lodieu, N.,	2014MNRAS.440.3184B
Sln2014		Burleigh, M.R., Lawrie, K.A., Kulebi, B., Koester, D. & Holland, B.R.
Sln2014		MNRAS 440, 3184, 2014
Sln2014		(Paper gives no dates or position angles. Coarse date of 2004.5 assigned to all Es
Sln2014		photometry. Theta derived from coordinates in Table 1.)
Sln2015	Es -	Andrews, J.J., Agueros, M.A., Gianninas, A., Kilic, M., Dhital, S. & Anderson, S.	2015ApJ...815...63A
Sln2015		ApJ 815, 63, 2015

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20440+4030	SLN 85		1998	1	203	9.3	15.30	17.90	DA+DAH	V	204401.03+403014.4
20440+4030	SLN 85		2000	2	209	9.9	15.30	17.90	DA+DAH	V	204401.03+403014.4
20440+4030	SLN 85		2015	2	203	9.1	15.30	17.90	DA+DAH	V	204401.03+403014.4
20440+4030	SLN 85		2016	7	203	9.1	15.30	17.90	DA+DAH	V	204401.03+403014.4

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WDS 20440+4030 SLN 85 : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20440+4030 SLN 85 : MEASURES

No records found.

WDS 20440+4030 : VIRTUAL EYEPIECE

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WDS 20440+4030 : ALADIN DSS IMAGE @ 20^h 44^m 01.03^s +40° 30' 14.4"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20440+4030 SLN 85 : NEIGHBORHOODS

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Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show		20440+4030	SLN 85		203	9.1	1
Show		20444+4027	TDT2510		157	0.9	6
Show		20436+4024	DAM1256		106	9.6	8
Show		20432+4026	COU2421		110	0.3	10
Show		20446+4040	HJ 1573		274	9.8	12
Show		20446+4041	HJ 1574		278	7.4	13
Show		20429+4036	MLB 24		175	5.9	16
Show		20454+4023	OSO 133	AB	114	12.0	18
Show		20454+4023	OSO 133	AC	236	11.7	18
Show		20454+4023	OSO 133	AD	67	21.8	18
Show		20454+4023	OSO 133	AE	8	22.4	18
Show		20426+4013	TDT2488		138	0.5	24
Show		20422+4041	MLB 23		41	7.6	24
Show		20456+4014	TDT2519		347	1.3	24
Show		20454+4011	TDT2518		203	0.7	25
Show		20453+4010	COU2293		201	1.1	25
Show		20420+4015	A 1433		24	0.8	28
Show		20466+4020	ES 1982		301	3.9	31
Show		20434+4001	BRT2272		285	5.1	31
Show		20444+4103	COU2423	AB	180	0.3	34
Show		20444+4103	GRV 375	AC	197	31.4	34
Show		20413+4051	COU2419		69	0.8	38
Show		20476+4038	CNT 9		292	9.0	42
Show		20419+3956	SEI1221		254	2.0	43
Show		20419+3953	SEI1222		77	25.4	45
Show		20405+4010	TOB 196	BC	32	23.4	45
Show		20405+4010	SEI1214	AB	78	20.3	46
Show		20427+3947	TDT2491		275	1.4	46
Show		20434+3943	TDT2497		317	0.5	48
Show		20416+3950	COU2290		43	0.5	50
Show		20396+4035	STT 410	AB	3	0.9	52
Show		20396+4035	STT 410	AB,C	70	68.6	52
Show		20396+4035	STT 410	AB,D	327	106.6	52
Show		20485+4041	ES 1682		152	3.1	52
Show		20428+4123	RAO 619		141	0.6	55
Show		20488+4024	ALI1192		2	16.5	55
Show		20402+3953	MLB 885		72	1.7	57
Show		20481+3958	CVR 231		359	9.7	58
Show		20484+4002	J 1237	BC	355	5.6	58
Show		20484+4002	SEI1255	AB	338	24.4	58
Show		20392+4017	ES 1980		60	8.3	59
Show		20421+4125	COU2420		90	0.5	59
Show		20395+4002	BRT2269		199	5.0	60
Show		20486+4000	TOB 198		96	21.0	61
Show		20447+4131	MLB 25		207	5.7	61
Show		20434+4131	HJ 1571		59	7.3	62
Show		20495+4035	COU2426		328	1.2	63
Show		20438+3928	SEI1230		124	25.3	63
Show		20428+4132	ES 1571		39	7.4	63
Show		20441+3927	ES 1981		310	4.5	64
Show		20478+3944	GRV 381		340	35.8	64

WDS 20440+4030 : COMPONENTS

	A
B	pa=197.9° sep=8.77"

20440+4030 A

Componente originario normalizzato	AB		Coord arcsec 2000	204401.03+403014.4		Mag	15.3		Spectral class	DA (white dwarf)
PmRA	19.00		PmDE	47.0

20440+4030 B

Componente originario normalizzato	AB		Coord arcsec 2000	204400.79+403006.1		Mag	17.9		Spectral class	DAH (white dwarf)
Calc delta mag	2.6		Calc coord	yes