20181+4044 STF 2666 AB (HD 193322)

Coord 2000	20181+4044		Discov num	STF2666		Comp	AB		Coord arcsec 2000	20 18 06.99 +40 43 55.6
Date first	1831		Date last	2018		Obs	86
Pa first	242		Pa last	244.8		P.A. Now (θ)	244.8°
Sep first	2.7		Sep last	2.758		Sep. Now (ρ)	2.758"
Mag pri	5.96		Mag sec	8.24		delta mag (ΔM)	2.28		Spectral class	O9IV+B1.5 (blue/blue-white)
Pri motion ra	+001		Sec motion ra	+001
Pri motion dec	-010		Sec motion dec	-010
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49438	20 18 07 +40 43 56	CHR 96 Aa,Ab	2018	31	151	0.1	6.60	6.80	0.20	Y
Show	HD 193322	49438	20 18 07 +40 43 56	STF 2666 AB	2018	86	245	2.8	5.96	8.24	2.28		<===
Show		49438	20 18 07 +40 43 56	STF 2666 AC	2006	13	207	34.0	5.96	10.70	4.74
Show		49438	20 18 07 +40 43 56	TAR 5 AD	2006	8	181	49.6	5.96	11.00	5.04
Show			20 18 06 +40 43 25	STF 2666 CD	2018	13	142	24.1	10.70	11.00	0.30

Quintuple system
4 estimated visually detectable stars in this system

Name	HD 193322		Constellation	Cygnus		SAO	49438		HIP	100069
Tycho2	3155-02321-1		Gaia DR2	2062360626011542272		HD	193322		HR	7767
GC	28228		ADS	13672		BD	BD+40 4103		Distance	595.24
Distance ly	1941.67

discov_num	notes	refcode
CHR 96	Aa,Ab: 1985.8396, 1988.6630, 1989.7061: These new observations were
	found from reprocessing unpublished archival data. We are currently	McA1993
	undertaking a duplicity survey of all bright (V<8) galactic O stars;
	this is one of four new binaries found by us so far in this survey.	McA1987a
	This system is also a known spectroscopic binary, and we are
	reanalyzing archival radial velocity data in an attempt to derive
	masses via a combined interferometric/spectroscopic orbit (see Gies et	Gie1993
	al. 1993 for a similar combined solution of the O star 15 Mon).
	The estimated period of the speckle binary orbit (CHR 96 Aa) is 31 y.
	The orbit quality rating in Table 1 is our own. The system is
	currently unresolved with the Mt. Wilson Hooker telescope, but we
	continue to observe this target. The brighter star of the speckle
	pair is also a 311-day, single-lined spectroscopic binary (McKibben et	Bgn1998
	al. 1998). The classifications of the C and D components are from	Hof1991
	Hoffleit & Warren (1991).	Msn1998a
	Cluster/Main-Sequence fitting determines a cluster distance of	Rbr2010b
	741 +/- 36 pc.
CHR 96	ten Brummelaar et al. (2011) use a combination of spectroscopic and	CIA2011b
CIA 6	astrometric data, including speckle and CHARA Array long-baseline
	interferometry, to derive orbits for both the Aa,Ab and Ab1,Ab2 pairs.
	Masses for Aa, Ab1, and Ab2 are 21, 23, and 9 Msun, respectively,
	effective temperatures are 33, 32.5, and 20 kK.
	Distance to Collinder 419 is 1006(+37-34) pc, yielding a mass sum of	MzA2019b
	76.1(+9.9-7.4) \msun.

refcode	metd	author	reference
Bgn1998	orb -	McKibben, W.P., Bagnuolo, W.G., Gies, D.R., Hahula, M.E., Hartkopf, W.I., Roberts,	1998PASP..110..900M
Bgn1998		L.C., Bolton, C.T., Fullerton, A.W., et al.
Bgn1998		PASP 110, 900, 1998
CIA2011b	Kf j	ten Brummelaar, T.A., O'Brien, D.P., Mason, B.D., Farrington, C.D.,	2011AJ....142...21T
CIA2011b	+Xh	Fullerton, A.W., Gies, D.R., Grundstrom, E.D., Hartkopf, W.I., et al.
CIA2011b	+orb	AJ 142, 21, 2011
Gie1993	Sc -	Gies, D.R., Mason, B.D., Hartkopf, W.I., McAlister, H.A., Frazin, R.A., Hahula,	1993AJ....106.2072G
Gie1993		M.E., Penny, L.R., Thaller, M.L., et al.
Gie1993		AJ 106, 2072, 1993
Hof1991	-	Hoffleit, D. & Jaschek, C.	1991bsc..book.....H
Hof1991		The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
McA1987a	Sc j	McAlister, H.A., Hartkopf, W., Hutter, D., Shara, M., & Franz, O.	1987AJ.....92..183M
McA1987a		AJ 92, 183, 1987
McA1993	Sc j	McAlister, H.A., Mason, B.D., Hartkopf, W.I., & Shara, M.M.	1993AJ....106.1639M
McA1993	+orb	AJ 106, 1639, 1993
Msn1998a	Sc j	Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G.,	1998AJ....115..821M
Msn1998a		ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a		AJ 115, 821, 1998
MzA2019b	orb+-	Maiz Apellaniz, J.	2019A&A...630A.119M
MzA2019b	+not	A&A 630, 119, 2019
Rbr2010b	C -	Roberts, L.C., Jr., Gies, D.R., Parks, J.R., Grundstrom, E.D., McSwain, M.,	2010AJ....140..744R
Rbr2010b		Berger, D., Mason, B., ten Brummelaar, T. & Turner, N.
Rbr2010b		AJ 140, 744, 2010

idgroup	discov	author
1	CHR	Center for High Ang. Res. Astronomy (speckle interferometry systems)
3	STF	Struve, F.G.W.
36	TAR	Tarrant, K.J.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20181+4044	STF2666	AB	2006	70	246	2.9	5.80	8.24	O9V	D	201806.99+404355.6
20181+4044	STF2666	AB	2007	76	245	2.8	5.80	8.24	O9V+B1.5V	N D	201806.99+404355.6
20181+4044	STF2666	AB	2008	77	245	2.7	5.80	8.24	O9V+B1.5V	N D	201806.99+404355.6
20181+4044	STF2666	AB	2011	79	245	2.8	5.80	8.24	O9V B1.5V	N D	201806.99+404355.6
20181+4044	STF2666	AB	2013	79	246	2.7	5.80	8.24	O9V B1.5V	N D	201806.99+404355.6
20181+4044	STF2666	AB	2018	86	245	2.8	5.96	8.24	O9IV+B1.5	N	201806.99+404355.6

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	23/07/24	Daedalus1	mean difficulty	separated	245		Primary is brilliant, surrounded by a group of much dimmer stars. The companion is also much dimmer than the primary; it is blue-grey.

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	12/07/07	northisup	easy	3.00		250.00		2.00	1	nice rich star field large mag diff
Show	23/07/24	Daedalus1	mean difficulty	2.88	0.07	245.00	0.00	2.27	12	Seeing: Pickering 5, poor

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

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