18181-1215 SS 7 AF (MY Ser)

Coord 2000	18181-1215		Discov num	SS    7		Comp	AF		Coord arcsec 2000	18 18 05.90 -12 14 33.3
Date first	1906		Date last	2018		Obs	14
Pa first	17		Pa last	15.5		P.A. Now (θ)	15.5°
Sep first	30.0		Sep last	30.108		Sep. Now (ρ)	30.108"
Mag pri	7.45		Mag sec	10.80		delta mag (ΔM)	3.35		Spectral class	O8Ia+B0 (blue/blue-white)
Pri motion ra	-000		Sec motion ra	-002
Pri motion dec	-003		Sec motion dec	-001
Notes	N (See Notes)

rPM=0.943 This double is not physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		161292	18 18 06 -12 14 33	DBK 1 Aa,Ab	2019	16	262	0.0	5.80	6.00	0.20	Y
Show		161292	18 18 06 -12 14 33	TRN 27 AB	2012	3	40	4.8	7.45	16.00	8.55
Show		161292	18 18 06 -12 14 33	SS 7 AC	2015	6	191	14.4	7.45	14.30	6.85
Show		161292	18 18 06 -12 14 33	SS 7 AD	2015	9	260	18.1	7.45	12.90	5.45
Show		161292	18 18 06 -12 14 33	SS 7 AE	2015	9	217	18.1	7.45	13.00	5.55
Show	MY Ser	161292	18 18 06 -12 14 33	SS 7 AF	2018	14	16	30.1	7.45	10.80	3.35		<===
Show		161292	18 18 06 -12 14 33	SS 7 AG	2015	7	9	39.4	7.45	15.50	8.05
Show		161292	18 18 06 -12 14 33	SS 7 AH	2018	12	268	40.8	7.45	9.80	2.35
Show		161292	18 18 06 -12 14 33	SS 7 AI	2015	5	299	45.7	7.45	13.70	6.25
Show		161292	18 18 06 -12 14 33	SS 7 AJ	2015	7	258	45.4	7.45	11.42	3.97
Show		161292	18 18 06 -12 14 33	SS 7 AK	2015	6	262	48.6	7.45	10.51	3.06
Show		161292	18 18 06 -12 14 33	SS 7 AL	2015	7	348	51.8	7.45	14.50	7.05
Show		161292	18 18 06 -12 14 33	SS 7 AM	2015	7	255	64.4	7.45	15.30	7.85
Show		161292	18 18 06 -12 14 33	SS 7 AN	2015	7	280	71.3	7.45	15.10	7.65
Show		161292	18 18 06 -12 14 33	SS 7 AO	2015	7	305	72.1	7.45	15.90	8.45
Show		161292	18 18 06 -12 14 33	SS 7 AP	2018	11	285	72.5	7.45	10.40	2.95
Show		161292	18 18 06 -12 14 33	SS 7 AQ	2015	9	291	84.9	7.45	11.70	4.25
Show			18 18 03 -12 14 40	BRT 2749 KJ	2015	8	121	4.3	10.51	11.42	0.91

18-fold system
17 estimated visually detectable stars in this system

Var name	MY Ser		Constellation	Serpens		SAO	161292		HIP	89681
Tycho2	5685-04419-1		Gaia DR2	4153657378750644864		HD	167971		BD	BD-12 4980
Distance	662.25		Distance ly	2160.26

discov_num	notes	refcode
TRN 27	MY Ser.
TRN 27	The image rotator was in an unknown state, so two possible theta
	values are listed for the 2001.7447 observation - one for zenith up
	and one for north up.	Trn2008
HD 167971	Leitherer et al. (1987 A&A 185, 121) argue that this is a triple
	system consisting of a close eclipsing pair and a brighter, distant O
	star; the spectral classification presumably applies to the latter
	star.	Msn1998a
DBK 1	Aa,Ab: System includes a 3.3d eclipsing binary, unresolved in the VLTI
	observations. De Becker et al. (2012) assume the components of the
	close pair are both O6.5V, and the wide component is O8I. V=7.35 for
	the system yields a distance of about 1.8 kpc, in good agreement with
	the 1.7 kpc distance determined by Reipurth (2008 Handbook of Star
	Forming Regions, vol 2, 590) for the NGC 6604 open cluster. The Aa,Ab
	orbit is thought to be very eccentric.	DBk2012

refcode	metd	author	reference
DBk2012	Kv j	De Becker, M., Sana, H., Absil, O., Le Bouquin, J.-B., & Blomme, R.	2012MNRAS.423.2711D
DBk2012	+orb	MNRAS 423, 2711, 2012
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
Trn2008	Ac j	Turner, N.H., ten Brummelaar, T.A., Roberts, L.C., Mason, B.D., Hartkopf, W.I., &	2008AJ....136..554T
Trn2008	+E2	Gies, D.R.
Trn2008	+A	AJ 136, 554, 2008
Trn2008		(Note: For some observations the image derotator was in an unknown state. In these
Trn2008		cases the theta value is either left blank or two possible values are listed - one
Trn2008		for zenith up and one for north up. For unresolved objects, the listed rho value
Trn2008		is the FWHM of the corrected stellar PSF. Larger FWHM values are indicative of
Trn2008		poorer seeing and/or non-optimal AO system tuning.)

idgroup	discov	author
1	BRT	Barton, S.G.
61	SS	Sharpless, S.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18181-1215	SS 7	AF	2000	4	16	30.2	7.45	10.80	O8Ia+B0	N	181805.90-121433.3
18181-1215	SS 7	AF	2015	11	16	30.2	7.45	10.80	O8Ia+B0	N	181805.90-121433.3
18181-1215	SS 7	AF	2018	14	16	30.1	7.45	10.80	O8Ia+B0	N	181805.90-121433.3

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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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