21164+0421 GRV 442

21^h 16^m 27.55^s +04° 21' 52.7" P.A. 181.00 sep 52.9 mag 12.30,13.57

Coord 2000	21164+0421	Discov num	GRV 442	Comp		Coord arcsec 2000	21 16 27.55 +04 21 52.7
Date first	2000	Date last	2015	Obs	7
Pa first	181	Pa last	180.8	P.A. Now (θ)	180.8°
Sep first	53.1	Sep last	52.874	Sep. Now (ρ)	52.874"
Mag pri	12.30	Mag sec	13.57	delta mag (ΔM)	1.27	Spectral class
Pri motion ra	-024	Sec motion ra	-024
Pri motion dec	-042	Sec motion dec	-022
Notes

rPM=0.413

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Constellation

Equuleus

Gaia DR2

1732308916346445696

WDS 21164+0421 GRV 442 : 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
21164+0421	GRV 442		2000	2	181	53.1	12.40	13.60		D	211627.55+042152.7
21164+0421	GRV 442		2010	3	181	52.9	12.30	13.57			211627.55+042152.7
21164+0421	GRV 442		2015	4	181	52.9	12.30	13.57			211627.55+042152.7

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WDS 21164+0421 GRV 442 : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 21164+0421 GRV 442 : MEASURES

No records found.

WDS 21164+0421 : VIRTUAL EYEPIECE

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WDS 21164+0421 : ALADIN DSS IMAGE @ 21^h 16^m 27.55^s +04° 21' 52.7"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 21164+0421 GRV 442 : 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		21164+0421	GRV 442		181	52.9
Show		21156+0419	TDT2865		112	2.1	13
Show		21172+0438	HU 274		147	4.1	20
Show		21179+0407	BAL2559		283	3.9	27
Show		21149+0440	BAL2979		182	11.5	30
Show		21145+0441	BU 682	AB	102	5.7	35
Show		21145+0441	BU 682	AC	179	93.0	35
Show		21169+0347	UC 4426		251	27.3	36
Show		21147+0354	UC 4420		80	51.3	38
Show		21139+0427	BAL2977		305	17.1	39
Show		21140+0457	GWP3048		278	115.4	51
Show	Kitalpha	21158+0515	WRH 35		104	0.0	54
Show		21126+0437	HJ 3013		119	11.3	59
Show		21192+0339	J 1721		272	3.2	60
Show		21173+0323	BAL2050		181	18.3	60
Show		21184+0518	HDS3031		103	0.1	64
Show		21129+0333	UC 4407		306	58.2	73
Show		21211+0336	NSN 5		65	7.5	83
Show		21109+0352	HO 151		17	1.6	89
Show		21197+0537	J 2341		350	7.4	90
Show		21225+0403	UC 4462		71	29.2	92
Show		21217+0512	CBL 599		197	19.9	93
Show		21138+0545	KPP3367		245	1.8	93
Show		21189+0252	HEI 407		62	0.2	95
Show		21197+0256	CVR 893		85	21.0	99
Show		21209+0307	BU 838		156	1.6	101
Show		21232+0409	SKF2742		104	1.4	101
Show		21188+0245	BAL2051		166	2.6	103
Show		21101+0341	BAL2558		38	2.2	104
Show		21190+0559	HJ 3022	AB	76	17.3	105
Show		21190+0559	HJ 3022	AC	310	41.8	105
Show		21102+0331	UC 4396		215	59.1	107
Show		21130+0248	BU 1303		234	4.2	108
Show		21093+0410	BU 1330	AB	54	3.7	109
Show		21131+0558	GWP3043	AB	300	81.7	109
Show		21131+0558	GWP3044	AC	139	96.7	109
Show		21237+0422	STF2791		103	2.9	109
Show		21091+0429	J 848		141	2.8	110
Show		21185+0236	OSO 144		346	16.8	110
Show		21094+0502	STT 429		-1	-1.0	114
Show		21214+0253	STT 435		239	0.7	116
Show		21242+0422	CVR 898		250	13.6	116
Show		21090+0410	HJ 5515	AB	126	14.4	117
Show		21090+0410	HJ 5515	AC	68	47.8	117
Show		21243+0343	A 2288		227	0.4	125
Show		21243+0327	BAL2561		288	20.5	131
Show		21242+0323	BAL2052		256	16.9	131
Show		21105+0241	SKF1594		288	3.3	135
Show		21080+0509	STT 527		114	0.4	135
Show		21096+0550	TDT2793		354	0.5	136
Show		21251+0330	FMR 163		12	15.4	140

WDS 21164+0421 : COMPONENTS

	A
B	pa=180.8° sep=52.87"

21164+0421 A

Componente originario normalizzato	AB		Coord arcsec 2000	211627.55+042152.7		Mag	12.3		PmRA	-24.00
PmDE	-42.0

21164+0421 B

Componente originario normalizzato	AB		Coord arcsec 2000	211627.50+042059.8		Mag	13.57		PmRA	-24.00
PmDE	-22.0		Calc delta mag	1.27		Calc coord	yes