18170-1858 SNA 85 Aa,Ab

Coord 2000	18170-1858		Discov num	SNA  85		Comp	Aa,Ab		Coord arcsec 2000	18 16 58.56 -18 58 05.1
Date first	2012		Date last	2012		Obs	2
Pa first	266		Pa last	265.2		P.A. Now (θ)	265.2°
Sep first	0.1		Sep last	0.047		Sep. Now (ρ)	0.047"
Mag pri	6.80		Mag sec	9.30		delta mag (ΔM)	2.5		Spectral class	O7II-III (blue)
Pri motion ra	+000		Sec motion ra
Pri motion dec	-002		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		161255	18 16 59 -18 58 05	SNA 85 Aa,Ab	2012	2	265	0.0	6.80	9.30	2.50		<===
Show		161255	18 16 59 -18 58 05	MZA 23 AB	2009	4	227	17.5	7.40	13.50	6.10
Show		161255	18 16 59 -18 58 05	SNA 85 AC	2012	1	88	5.1	6.67	12.57	5.90
Show		161255	18 16 59 -18 58 05	SNA 85 AD	2012	1	247	5.8	6.67	13.63	6.96
Show		161255	18 16 59 -18 58 05	SNA 85 AE	2012	1	58	7.3	6.67	14.01	7.34

Sextuple system
5 estimated visually detectable stars in this system

Constellation	Sagittarius		SAO	161255		Tycho2	6273-00422-1		Gaia DR2	4094790350826867584
HD	167659

discov_num	notes	refcode
SNA 85	Aa,Ab: Both NACO/SAM and PIONIER resolved the A componnet as a 50mas
	pair, which probably corresponds to the 80mas pair detected through	Rad1980
	occultation (Radick & Lien 1980). The object may further be an SB1
	(Gamen et al. 2008, RevMexAA 33, 54)	Sna2014
HD 167659	Hilt 730. The 3 speckle observations all indicate a single star, so we
	cannot confirm the existence of a companion found by lunar occultation	Msn1998a
	(Radick & Lien 1980).	Rad1980

refcode	metd	author	reference
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
Rad1980	O j	Radick, R.R. & Lien, D.	1980AJ.....85.1053R
Rad1980		AJ 85, 1053, 1980
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	MZA	Maiz-Apellaniz, J., Walborn, N.R., Morrell, N.I., Niemela, V.S., & Nelan, E.P.
4	MZA	Maiz-Apellaniz, J., Negueruela, I., Barba, R.H., Walborn, N.R., Pellerin, A.,
4	MZA	Simon-Diaz, S., Sota, A., Marco, A., Alonso-Santiago, J., Sanchez-Bermudez, J.,
4	MZA	Gamen, R.C., & Lorenzo, J.
5	MZA	Maiz-Apellaniz, J., Sota, A., Arias, J.I., Barba, R.H., Walborn, N.R., Simon-Diaz,
5	MZA	S., Negueruela, I., Marco, A., Leao, J.R., Herrero, A., Gamen, R.C. & Alfaro, E.J.
7	MZA	Maiz-Apellaniz, J., Barba, R.H., Simon-Diaz, S., Sota, A., Trigueros Paez, E.,
7	MZA	Caballero, J.A. & Alfaro, E.J.
9	MZA	Maiz Apellaniz, J., Trigueros Paez, E., Negueruela, I., Barba, R.H., Simon-Diaz,
9	MZA	S., Lorenzo, J., Sota, A., Gamen, R.C., Farina, C., Salas, J., Caballero, J.A.,
9	MZA	Morrell, N.I., Pellerin, A., Alfaro, E.J., Herrero, A., Arias, J.I. & Marco, A.
13	MZA	Maiz Apellaniz, J., Trigueros Paez, E., Negueruela, I., Barba, R.H., Simon-Diaz,
13	MZA	S., Lorenzo, J., Sota, A., Gamen, R.C., Farina, C., Salas, J., Caballero, J.A.,
13	MZA	Morrell, N.I., Pellerin, A., Alfaro, E.J., Herrero, A., Arias, J.I. & Marco, A.
14	MZA	Maiz Apellaniz, J., Barba, R.H., Farina, C., Sota, A., Pantaleoni Gonzalez, M.,
14	MZA	Holgado, G., Negueruela, I. & Simon-Diaz, S.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18170-1858	SNA 85	Aa,Ab	2012	2	265	0.0	6.80	9.30	O7II-III	NV K	181658.56-185805.1

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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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