20494+4458 GRV 384

20^h 49^m 25.63^s +44° 58' 20.1" P.A. 222.00 sep 22.1 mag 10.71,11.45

Coord 2000	20494+4458	Discov num	GRV 384	Comp		Coord arcsec 2000	20 49 25.63 +44 58 20.1
Date first	1892	Date last	2015	Obs	12
Pa first	223	Pa last	221.8	P.A. Now (θ)	221.8°
Sep first	21.8	Sep last	22.136	Sep. Now (ρ)	22.136"
Mag pri	10.71	Mag sec	11.45	delta mag (ΔM)	0.74	Spectral class
Pri motion ra	-007	Sec motion ra	-009
Pri motion dec	-029	Sec motion dec	-031
Notes

rPM=0.088 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Tycho2

3178-00020-1

Gaia DR2

2163214296442976000

WDS 20494+4458 GRV 384 : NOTES

No records found.

REFERENCES

refcode	metd	author	reference
Grv2004	Eu -	Greaves, J.	2004MNRAS.355..585G
Grv2004		MNRAS 355, 585, 2004
Grv2005a	Es -	Greaves, J.	...................
Grv2005a	+C	Webb Soc., Double Star Circ. 13, 2005 (GRV 973 - 1147)
Grv2005a		(Note: RA for all WDS designations inadvertently truncated to integer minute)
Grv2005b	Pa -	Greaves, J.	...................
Grv2005b		private communication
Grv2005c	C -	Greaves, J.	2005JDSO....1...41G
Grv2005c		JDSO 1, 41, 2005
Grv2006	-	Greaves, J.	...................
Grv2006		private communication, 2006
Grv2006		(measures done using LSPM-north, see Vizier On-line Data Catalog I/298;
Grv2006		Lepine & Shara 2005)
Grv2006b	Es -	Greaves, J.	...................
Grv2006b		private Communication, 2006
Grv2006b		(Reduction of SDSS data. Calculated position is to J2000, but actual observation
Grv2006b		epoch is unknown and proper motion may or may not have been applied.)
Grv2006c	Ey -	Greaves, J.	...................
Grv2006c		private Communication, 2006
Grv2006c		(Reduction of SPM3.3 data. Calculated position is to 1991.25, but actual
Grv2006c		observation epoch is unknown and proper motion may or may not have been applied.)
Grv2008	Es -	Greaves, J.	...................
Grv2008		Webb Soc., Double Star Circ. 16, 2008
Grv2011	C -	Greaves, J.	...................
Grv2011		Webb Soc., Double Star Circ. 19, 2011
Grv2011		These carry a discovery designation of SPM and come from the SPM4 Catalog	2011AJ....142...15G
Grv2019a	Hg u	Greaves, J.	2019JDSO...15...59G
Grv2019a		JDSO 15, 59, 2019
Grv2019b	Hg u	Greaves, J.	2019JDSO...15...77G
Grv2019b		JDSO 15, 59, 2019
Grv2019c	Hg u	Greaves, J.	...................
Grv2019c		private communication, 2019 (17 April 2019 email)
Grv2019d	Hg -	Greaves, J.	.
Grv2019d		private communication, 2019 (4 Nov 2019 email)
Grv2020a	not -	Greaves, J.	.
Grv2020a		private communication, 2020 (14 Mar 2020 email)
Grv2020b	Hg j	Greaves, J.	.
Grv2020b		Webb Soc., Double Star Circ. 28, 23, 2020
Grv2020c	Hg j	Greaves, J.	.
Grv2020c		Webb Soc., Double Star Circ. 28, 35, 2020
Grv2020d	Hg j	Greaves, J.	.
Grv2020d		Webb Soc., Double Star Circ. 28, 39, 2020
Grv2020e	Hg u	Greaves, J.	2020JDSO...16..317G
Grv2020e		JDSO 16, 317, 2020
Grv2020f	Hg	Greaves, J.	2020JDSO...16..362G
Grv2020f		JDSO 16, 362, 2020
Grv2020g	Hg -	Greaves, J.	.
Grv2020g		private communication, 2020 (29 Nov 2020 email)
Grv2020h	Hg -	Greaves, J.	.
Grv2020h		private communication, 2020 (10 Dec 2020 email)
Grv2020i	Hg -	Greaves, J.	.
Grv2020i		private communication, 2020 (12 Dec 2020 email)
Grv2020j	Hg -	Greaves, J.	.
Grv2020j		private communication, 2020 (21 Dec 2020 email)
Grv2021a	not -	Greaves, J.	.
Grv2021a		private communication, 2021 (18 Feb 2021 email)
Grv2021b	not -	Greaves, J.	.
Grv2021b		private communication, 2021 (23 Feb 2021 email)
Grv2021c	Hg+ -	Greaves, J., Rica Romero, F.M. & Otero, S.	2021JDSO...17..137G
Grv2021c	+orb	JDSO 17, 137, 2021
Grv2021d	Hg -	Greaves, J.	.
Grv2021d		private communication, 2021 (23 Aug 2021 email)
Grv2021e	Hg -	Greaves, J.	.
Grv2021e		private communication, 2021 (24 Aug 2021 email)
Grv2022	Hg j	Greaves, J. .
Grv2022		Webb Soc., Double Star Circ. 30, 27, 2022
Grv2023a	Hg -	Greaves, J.	.
Grv2023a		private communication, 2023 (15 Feb 2023 email)

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20494+4458	GRV 384		2000	5	222	21.9	10.71	11.45		D	204925.63+445820.1
20494+4458	GRV 384		2002	6	222	22.0	10.71	11.45		D	204925.63+445820.1
20494+4458	GRV 384		2010	6	222	22.0	10.71	11.45			204925.63+445820.1
20494+4458	GRV 384		2015	7	222	22.1	10.71	11.45			204925.63+445820.1

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

WDS 20494+4458 GRV 384 : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20494+4458 GRV 384 : MEASURES

No records found.

WDS 20494+4458 : VIRTUAL EYEPIECE

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

WDS 20494+4458 : ALADIN DSS IMAGE @ 20^h 49^m 25.63^s +44° 58' 20.1"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20494+4458 GRV 384 : 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		20494+4458	GRV 384		222	22.1
Show		20494+4452	TDS1103		200	0.8	7
Show		20504+4518	SMA 121		32	11.6	12
Show		20511+4459	LDS2459		228	43.7	18
Show		20500+4521	ES 2702		348	8.6	24
Show		20485+4519	LDS2456		236	18.0	25
Show		20492+4525	COU2646		266	0.4	27
Show		20490+4525	SMA 120		313	4.3	28
Show		20504+4525	LDS5912		252	17.4	29
Show		20514+4519	ARG 40		250	9.2	30
Show		20521+4438	HER 18		85	60.7	35
Show		20461+4452	ES 30		57	17.1	37
Show		20459+4448	ES 2701		81	50.9	39
Show		20472+4427	COU2424		255	0.5	39
Show		20489+4537	HDS2965		282	0.1	40
Show		20506+4421	CHN 29		52	5.3	40
Show		20509+4421	CHN 30	AB	92	2.7	41
Show		20509+4421	CHN 30	Aa,Ab	108	0.6	41
Show		20473+4535	HO 280		75	11.7	43
Show		20525+4430	BRT2279		5	4.5	44
Show		20519+4537	SMA 122		262	7.4	47
Show		20512+4415	CHN 31		47	6.7	48
Show		20538+4443	LDS5914		124	6.2	50
Show		20535+4523	HDS2975		191	0.2	50
Show		20542+4508	LDS5915		43	18.0	51
Show		20532+4423	LSC 94		183	0.3	54
Show		20501+4404	STT 595	AB	48	55.4	56
Show		20501+4404	STG 9	AC	83	102.7	56
Show		20501+4404	FYM 92	AD	242	51.8	56
Show		20501+4404	FYM 92	AE	190	35.2	56
Show		20501+4404	FYM 92	AF	80	46.9	56
Show		20541+4507	STT 422		332	2.6	58
Show		20549+4451	LDS2466		287	4.8	59
Show		20449+4425	ES 1332		325	7.0	60
Show		20527+4547	TDT2597		327	1.3	60
Show		20461+4410	BRT2275		10	2.8	61
Show		20464+4551	CVR 230		7	112.9	62
Show		20440+4521	KPP3361		134	2.2	62
Show		20528+4551	COU2647		225	0.4	64
Show		20436+4514	CBL 85		166	17.7	64
Show		20434+4501	ES 668	AB	68	5.2	64
Show		20434+4501	ES 668	AC	269	23.4	64
Show		20434+4501	FYM 322	AD	200	18.7	64
Show		20433+4456	ES 2699		296	40.1	66
Show		20556+4453	COU2648		21	1.3	66
Show		20432+4458	BKO 159		37	13.2	67
Show		20558+4448	ES 674		94	5.6	69
Show		20489+4607	HJ 1581		170	22.4	69
Show		20432+4431	COU2422		236	1.3	73
Show		20563+4447	ES 675	BC	108	3.7	73
Show		20461+4353	GRV 378		135	35.3	74

WDS 20494+4458 : COMPONENTS

	A
B	pa=212.3° sep=19.53"

20494+4458 A

Componente originario normalizzato	AB		Coord arcsec 2000	204925.63+445820.1		Mag	10.71		PmRA	-7.00
PmDE	-29.0		Tycho2	3178-00020-1

Tycho2

Tycho2	3178-00020-1	Pflag		RAmdeg	312.35680894	DEmdeg	44.97226217
PmRA	-12.5	PmDE	-28.4	E RAmdeg	27	E DEmdeg	29
E pmRA	1.5	E pmDE	1.5	EpRAm	1986.99	EpDEm	1986.49
Num	4	Q RAmdeg	1.0	Q DEmdeg	0.5	Q pmRA	1.1
Q pmDE	0.5	BTmag	11.211	E BTmag	0.052	VTmag	10.712
E VTmag	0.050	Prox	221	TYC	T	HIP
CCDM		RAdeg	312.35684750	DEdeg	44.97232611	EpRA 1990	1.67
EpDE 1990	1.63	E RAdeg	30.7	E DEdeg	32.1	Posflg
Corr	0.1

20494+4458 B

Componente originario normalizzato	AB		Coord arcsec 2000	204924.65+445803.6		Mag	11.45		PmRA	-9.00
PmDE	-31.0		Tycho2	3178-00056-1		Calc delta mag	0.74		Calc coord	yes

Tycho2

Tycho2	3178-00056-1	Pflag		RAmdeg	312.35102594	DEmdeg	44.96766243
PmRA	-10.5	PmDE	-31.2	E RAmdeg	56	E DEmdeg	59
E pmRA	1.9	E pmDE	1.8	EpRAm	1981.95	EpDEm	1978.97
Num	3	Q RAmdeg	0.3	Q DEmdeg	0.3	Q pmRA	0.3
Q pmDE	0.3	BTmag	12.270	E BTmag	0.144	VTmag	11.451
E VTmag	0.091	Prox	221	TYC	T	HIP
CCDM		RAdeg	312.35106028	DEdeg	44.96773500	EpRA 1990	1.69
EpDE 1990	1.64	E RAdeg	59.3	E DEdeg	62.5	Posflg
Corr	0.1