20136+4644 STFA 50 AC (Omi1 Cyg)

Coord 2000	20136+4644		Discov num	STFA 50		Comp	AC		Coord arcsec 2000	20 13 37.90 +46 44 28.8
Date first	1779		Date last	2016		Obs	46
Pa first	183		Pa last	172.7		P.A. Now (θ)	172.7°
Sep first	100.0		Sep last	108.6		Sep. Now (ρ)	108.6"
Mag pri	3.93		Mag sec	6.97		delta mag (ΔM)	3.04		Spectral class	K2II (yellow-orange)
Pri motion ra	+005		Sec motion ra	+003
Pri motion dec	+001		Sec motion dec	+003
Notes	N (See Notes)

rPM=0.555 Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49337	20 13 38 +46 44 29	WRH 33 Aa,Ab	1985	6	111	0.0	3.93			Y
Show		49337	20 13 38 +46 44 29	HJ 1495 AB	2015	12	328	36.5	3.93	13.40	9.47
Show	Omi1 Cyg	49337	20 13 38 +46 44 29	STFA 50 AC	2016	46	173	108.6	3.93	6.97	3.04		<===
Show		49337	20 13 38 +46 44 29	STFA 50 AD	2016	38	322	336.7	3.93	4.83	0.90
Show		49337	20 13 38 +46 44 29	BU 1483 AF	2015	4	168	43.5	3.93	13.90	9.97
Show		49338	20 13 39 +46 42 43	BU 1483 CG	2003	3	95	37.9	6.97	14.20	7.23
Show		49338	20 13 39 +46 42 43	BU 1483 CH	2014	4	62	60.6	6.97	12.60	5.63
Show		49338	20 13 39 +46 42 43	BU 1483 CI	2015	7	136	60.2	6.97	12.26	5.29
Show		49332	20 13 18 +46 48 56	GUI 30 DC	2003	27	150	431.8	4.83	6.97	2.14
Show		49332	20 13 18 +46 48 56	ES 26 DE	2003	4	252	36.3	4.83	13.20	8.37
Show			20 13 39 +46 43 46	SMR 68 FJ	2021	4	218	4.0	13.90	15.10	1.20
Show			20 13 44 +46 43 11	SMR 68 HK	2021	9	263	9.0	11.74	10.87	0.87

12-fold system
11 estimated visually detectable stars in this system

Name	Omi1 Cyg		Var name	V695 Cyg		Constellation	Cygnus		SAO	49337
HIP	99675		Tycho2	3559-02797-1		Gaia DR2	2082600852678091904		HD	192577
HR	7735		GC	28099		ADS	13554		BD	BD+46 2882
Bayer	Omicron 1 Cygni		Bayer name	Omi1 Cyg		Flamsteed	31 Cygni		Flamsteed name	31 Cyg
FK5	757		Distance	271		Distance ly	884		Bayer greek	ο1 Cyg

discov_num	notes	refcode
WRH 33	Aa,Ab: 31 Cyg = omi 1 Cyg. A spectroscopic, eclipsing, astrometric,
	interferometric binary. A is the zeta Aurigae-type binary V695 Cyg.
	It is spectrum K4Ib+B3-4.
	Aa,Ab: Star D noted as single. See Wilson (1950) for extensive notes
	on comparison of measures with orbits, mass estimates, etc.	WRH1950a
	Aa,Ab: Reality of these measures would seem more questionable than
	those published in 1950.	WRH1951
	Aa,Ab: Attempted to observe visually this 10yr binary which passed
	eclipse late in 1951.	WRH1954b
	Aa,Ab: Correction for magnitude difference should increase this
	estimated separation.	WRH1955
	Aa,Ab seen single in 1953, resolved once again by McAlister in 1980.	McA1983
	1983.4905: Our ACFs do not resolve the system with much confidence
	(theta ~168 deg, rho ~0".029).	Bag1984a
	Hipparcos astrometric solution adopted some elements from the orbit of	HIP1997d
	Wright (1970).	Wri1970
	Mk III Limb-darkened diameter 4.47 +/- 0.06 mas.	MkT2001
	Mk III Limb-darkened diameter 4.362 +/- 0.044 mas.	MkT2003
	NPOI Limb-darkened diameter 4.49 +/- 0.06 mas.	NOI2001b
GUI 30	D: 30 Cyg.
STFA 50	STTA204.
	AC: H 6 10.	MEv2010

refcode	metd	author	reference
Bag1984a	S j	Balega, Y.Y. & Ryadchenko, V.P.	1984SvAL...10...95B
Bag1984a		SvAL 10, 95, 1984
HIP1997d	orb -	Hipparcos	1997yCat.1239....0E
HIP1997d		Hipparcos Catalog, ESA SP-1200, 1997
HIP1997d		(DMSA/O Orbital Solutions)
McA1983	Sc j	McAlister, H.A., Hendry, E.M., Hartkopf, W.I., Campbell, B.G., & Fekel, F.C.	1983ApJS...51..309M
McA1983		ApJS 51, 309, 1983
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT2001	not j	Nordgren, T.E., Sudol, J.J. & Mozurkewich, D.	2001AJ....122.2707N
MkT2001		AJ 122, 2707, 2001	.
MkT2003	Km -	Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A.,	2003AJ....126.2502M
MkT2003	+not	Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003		AJ 126, 2502, 2003
NOI2001b	not j	Nordgren, T.E., Sudol, J.J. & Mozurkewich, D.	2001AJ....122.2707N
NOI2001b		AJ 122, 2707, 2001	.
WRH1950a	J j	Wilson, R.H.	1950AJ.....55..153W
WRH1950a	+Ma	AJ 55, 153, 1950
WRH1950a		(U and T coded observations per van den Bos, J Obs 34, 85, 1951)	1951JO.....34...85V
WRH1951	J j	Wilson, R.H.	1951AJ.....56...69W
WRH1951	+Ma	AJ 56, 69, 1951
WRH1951		(U and T coded observations per van den Bos, J Obs 34, 85, 1951)	1951JO.....34...85V
WRH1954b	J j	Wilson, R.H.	1954AJ.....59..256W
WRH1954b	+Ma	AJ 59, 256, 1954
WRH1955	J j	Wilson, R.H.	1955AJ.....60..446W
WRH1955	+Ma	AJ 60, 446, 1955
Wri1970	-	Wright, K.O.	1970VA.....12..147W
Wri1970		Vistas Astr. 12, 147, 1970

idgroup	discov	author
1	BU	Burnham, S.W. (BU 1 - 81)
179	ES	Espin, T.E.
274	GUI	Guillaume, J.
279	HJ	Herschel, J.F.W.
328	SMR	Schlimmer, J.
383	STF	Struve, F.G.W.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20136+4644	STFA 50	AC	2008	38	174	106.7	3.93	6.97	K2II	D	201337.90+464428.8
20136+4644	STFA 50	AC	2011	40	174	111.0	3.93	6.97	K2II	N D	201337.90+464428.8
20136+4644	STFA 50	AC	2014	43	173	106.8	3.93	6.97	K2II	N D	201337.90+464428.8
20136+4644	STFA 50	AC	2015	45	173	106.8	3.93	6.97	K2II	N	201337.90+464428.8
20136+4644	STFA 50	AC	2016	46	173	108.6	3.93	6.97	K2II	N	201337.90+464428.8

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

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	13/10/09	gianluca.paone	easy	separated	176	interesting	Pa estim 176°

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