16540-4148 SNA 51 Fa,Fb

Coord 2000	16540-4148		Discov num	SNA  51		Comp	Fa,Fb		Coord arcsec 2000	16 54 03.58 -41 47 29.9
Date first	2011		Date last	2014		Obs	16
Pa first	46		Pa last	54.2		P.A. Now (θ)	54.2°
Sep first	0.0		Sep last	0.004		Sep. Now (ρ)	0.004"
Mag pri	6.30		Mag sec	8.30		delta mag (ΔM)	2		Spectral class	O6Ib (blue)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-009		Sec motion dec
Notes	N V K (See Notes, Proper motion indicates physical, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		227377	16 54 02 -41 48 23	SNA 51 Aa,Ab	2011	1	153	0.0	5.10	7.00	1.90
Show	HD 152234	227377	16 54 02 -41 48 23	B 1833 AB	2006	8	75	0.5	5.65	7.92	2.27
Show		227377	16 54 02 -41 48 23	B 1833 AC	2015	2	99	5.4	5.65	13.80	8.15
Show		227377	16 54 02 -41 48 23	SEE 293 AD	1999	4	127	19.1	5.66	13.70	8.04
Show		227377	16 54 02 -41 48 23	SEE 293 AE	1999	5	281	20.5	5.66	13.00	7.34
Show		227377	16 54 02 -41 48 23	JC 23 AF	2018	15	19	56.7	5.65	6.56	0.91
Show		227380	16 54 04 -41 47 30	SNA 51 Fa,Fb	2014	16	54	0.0	6.30	8.30	2.00	Y	<===
Show		227380	16 54 04 -41 47 30	SEE 294 FG	2015	5	47	6.7	6.59	13.00	6.41
Show		227380	16 54 04 -41 47 30	HJ 4892 FH	2015	13	300	8.8	6.59	9.60	3.01

Decuple system
8 estimated visually detectable stars in this system

Constellation	Scorpius		SAO	227380		Tycho2	7876-02254-1		Gaia DR2	5966510229078336768
HD	152233

Period (P)	871.3d (2.39y)	± 4.6	Periastron (T)	56276d (2012.954y)	± 11	Semi-major axis (a)	4.15m	± 0.09
Eccentricity (e)	0.543	± 0.011	Inclination (i)	84.7°	± 1.5	Longitude of periastron (ω)	192°	± 5.1
Node (Ω)	49.4°	± 1	Notes	n		Reference	LeB2017
Equinox			Last observation			Grade	5	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 51.4 0.006 2001-01-01 229.0 0.002 2002-01-01 49.4 0.006 2003-01-01 61.4 0.002 2004-01-01 46.9 0.005 2005-01-01 53.0 0.005 2006-01-01 24.6 0.001 2007-01-01 50.6 0.006 2008-01-01 213.6 0.001 2009-01-01 48.6 0.006 2010-01-01 55.9 0.003 2011-01-01 44.9 0.003 2012-01-01 51.9 0.006 2013-01-01 233.7 0.002 2014-01-01 49.8 0.006 2015-01-01 69.8 0.001 2016-01-01 47.5 0.005 2017-01-01 53.7 0.004 2018-01-01 39.2 0.002 2019-01-01 51.0 0.006 2020-01-01 223.8 0.002 2021-01-01 49.0 0.006 2022-01-01 57.6 0.003 2023-01-01 46.0 0.004 2024-01-01 52.3 0.005 2025-01-01 247.3 0.001 2026-01-01 50.1 0.006 2027-01-01 121.2 2028-01-01 48.0 0.006 2029-01-01 54.5 0.004 2030-01-01 42.9 0.002		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
B 1833	This O star is the F component of a multiple system. The A component
SEE 293	is HD 152234 which is a B0.5Ia star (Hoffleit & Warren 1991). The	Hof1991
SEE 294	AB system is a 0".5 binary which was observed and resolved 3 times.	Msn1998a
SNA 51	Aa,Ab: HD 152234 is a 125d SB2 (Sana et al. 2012); the spectroscopic	Sna2012
	companion is marginally resolved in PIONIER observations with
	rho=0.9+/-1.9mas and dH=1.37.	Sna2014
SNA 51	Fa,Fb: We resolve for the first time this long-period SB2 discussed in	Sna2008a
	Sana et al. (2008a, 2012)	Sna2014

refcode	metd	author	reference
Hof1991	-	Hoffleit, D. & Jaschek, C.	1991bsc..book.....H
Hof1991		The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
LeB2017	orb j	Le Bouquin, J.-B., Sana, H., Gosset, E., De Becker, M., Duvert, G., Absil, O.,	2017A&A...601A...34
LeB2017	+Kv	Anthonioz, F., Berger, J.-P., Ertel, S., Grellmann, R., Guieu, S., Kervella, P.,
LeB2017		Rabus, M., & Willson, M.
LeB2017		A&A 601, A34, 2017
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
Sna2008a	not -	Sana, H., Gosset, E., Naze, Y., Rauw, G., & Linder, N.	2008MNRAS.386..447S
Sna2008a		MNRAS 386, 447, 2008
Sna2012	not -	Sana, H., de Mink, S.E., de Koter, A., et al.	2012Sci...337..444S
Sna2012		Science 337, 444, 2012
Sna2014	Kv j	Sana, H., LeBouquin, J.-B., Lacour, S., Berger, J.-P., Duvert, G., Gauchet, L.,	2014ApJS..215...15S
Sna2014	+A	Norris, B., Olofsson, J., Pickel, D., Zins, G., Absil, O., de Koter, A.,
Sna2014		Kratter, K., Schnurr, O., & Zinnecker, H.
Sna2014		ApJS 215, 15, 2014
Sna2014		(NACO companions in Table 6 assumed physical if quoted probability of spurious
Sna2014		detection <10%, optical if >90%, otherwise indeterminate)

idgroup	discov	author
1	B	van den Bos, W.H.
212	HJ	Herschel, J.F.W.
261	JC	Jacob, W.S.
300	SEE	See, T.J.J.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16540-4148	SNA 51	Fa,Fb	2012	1	60	0.0	6.30	8.30	O6Ib	NV K	165403.58-414729.9
16540-4148	SNA 51	Fa,Fb	2014	16	54	0.0	6.30	8.30	O6Ib	NV K	165403.58-414729.9

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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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