20231+5504 OL 74

20^h 21^m 09.13^s +55° 03' 19.9" P.A. 41.00 sep 3.9 mag 12.80,12.90

Coord 2000	20231+5504	Discov num	OL 74	Comp		Coord arcsec 2000	20 21 09.13 +55 03 19.9
Date first	1916	Date last	2015	Obs	4
Pa first	41	Pa last	41.1	P.A. Now (θ)	41.1°
Sep first	3.8	Sep last	3.938	Sep. Now (ρ)	3.938"
Mag pri	12.80	Mag sec	12.90	delta mag (ΔM)	0.1	Spectral class
Pri motion ra	-013	Sec motion ra	+073
Pri motion dec	-012	Sec motion dec	+076
Notes	N R (See Notes, Red magnitudes)

rPM=1.168

This double is not physical.

OTHER CATALOGS AND DESIGNATIONS

Constellation

Cygnus

Gaia DR2

2185312624734214656

ADS

13800

WDS 20231+5504 OL 74 : NOTES

discov_num	notes	refcode
OL 74	Although listed as a measure of OL 77 by Olivier (1920), neither	Ol_1920a
	the coordinates nor the measure agreed with that pair, so it has been
	assigned a new designation. Previously listed in the WDS as OL 80.
	Although this measure (40.7deg, 3.79") could conceivably be a measure
	of OL 80 with a 100deg theta error (expected values are about
	140deg, 3.5"), the near-zero magnitude difference does not agree with
	the ~2 magnitude estimates for OL 80. Finally, the coordinates of
	OL 80 are 18547-1946, making such a misidentification implausible.

REFERENCES

refcode	metd	author	reference
Ol_1920a	Po j	Olivier, C.P.	.
Ol_1920a		Pub. McCormick Obs. 3, 679, 1920

DISCOVERER

idgroup	discov	author
1	OL	Olivier, C.P.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20231+5504	OL 74		2003	3	40	3.9	12.80	12.90		N R	202109.13+550319.9
20231+5504	OL 74		2015	4	41	3.9	12.80	12.90		N R	202109.13+550319.9

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WDS 20231+5504 OL 74 : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20231+5504 OL 74 : MEASURES

No records found.

WDS 20231+5504 : VIRTUAL EYEPIECE

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WDS 20231+5504 : ALADIN DSS IMAGE @ 20^h 21^m 09.13^s +55° 03' 19.9"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20231+5504 OL 74 : 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		20231+5504	OL 74		41	3.9	1
Show		20209+5511	TDT2197		241	2.0	8
Show		20189+5503	KPP 932		255	7.7	20
Show		20222+5437	STI2521		123	7.1	27
Show		20244+5509	TDT2241		263	1.7	29
Show		20184+5524	STF2671	CD	138	5.3	31
Show		20184+5524	STF2671	AB	337	3.8	32
Show		20184+5524	STF2671	AC	53	87.2	32
Show		20184+5524	WOR 52	AE	54	30.3	32
Show		20247+5446	TDT2247		213	0.6	36
Show		20246+5527	MLR 588		245	0.2	38
Show		20202+5540	STI2519		119	13.2	38
Show		20257+5508	A 1429		187	0.7	40
Show		20248+5534	TDS1071		184	0.9	44
Show		20252+5437	STI2524		60	14.0	44
Show		20255+5441	HJ 1516	AB	147	47.3	44
Show		20255+5441	HJ 1516	AC	204	50.3	44
Show		20185+5542	BU 1260		135	0.3	45
Show		20264+5500	STI2528		214	10.1	46
Show		20260+5526	STI2527		81	5.2	48
Show		20255+5434	GIC 157		298	27.6	48
Show		20239+5420	HDS2914		213	0.2	50
Show		20147+5509	TDT2115		265	2.2	56
Show		20256+5544	KPP4196		114	2.7	56
Show		20164+5542	KR 49		114	1.7	56
Show		20278+5456	TDT2293		261	0.8	58
Show		20143+5501	TDT2111		154	2.0	59
Show		20281+5513	STI2533		198	10.0	60
Show		20153+5429	TDT2122		342	0.5	62
Show		20153+5428	TDT2123		328	2.0	62
Show		20142+5445	A 1422		351	2.8	63
Show		20155+5546	STI2515		83	13.5	65
Show		20243+5602	TDT2239		256	1.7	65
Show		20194+5607	STF2669	AB	259	23.4	66
Show		20194+5607	BU 1486	AC	162	18.4	66
Show		20241+5358	MLR 608		278	1.9	70
Show		20284+5430	STF2693		12	13.7	71
Show		20140+5428	TDT2108		311	0.8	72
Show		20152+5409	HO 455	BC	176	4.0	75
Show		20152+5409	HO 455	BE	30	5.6	75
Show		20152+5409	HO 455	AB	83	35.1	75
Show		20152+5409	HO 455	AD	263	31.4	75
Show		20152+5409	HO 455	AE	71	39.6	75
Show		20264+5402	FRK 9		238	59.8	77
Show		20124+5447	TDT2082		349	2.2	77
Show		20131+5538	STI2513		333	5.0	77
Show		20258+5612	TDT2262		95	0.8	80
Show		20298+5436	STI2536		91	7.5	80
Show		20131+5544	STI2512		107	10.5	80
Show		20140+5557	TOK 5		90	0.0	82
Show		20134+5416	STI2514		203	7.9	83

WDS 20231+5504 : COMPONENTS

	A
B	pa=26.5° sep=3.32"

20231+5504 A

Componente originario normalizzato	AB		Coord arcsec 2000	202109.13+550319.9		Mag	12.8		PmRA	-13.00
PmDE	-12.0		ADS	13800

20231+5504 B

Componente originario normalizzato	AB		Coord arcsec 2000	202109.30+550322.9		Mag	12.9		PmRA	73.00
PmDE	76.0		Calc delta mag	0.1		Calc coord	yes