18152-2023 SNA 83 AD

Coord 2000	18152-2023		Discov num	SNA  83		Comp	AD		Coord arcsec 2000	18 15 12.97 -20 23 16.7
Date first	2012		Date last	2012		Obs	1
Pa first	281		Pa last	280.8		P.A. Now (θ)	280.8°
Sep first	6.5		Sep last	6.51		Sep. Now (ρ)	6.51"
Mag pri	5.88		Mag sec	13.04		delta mag (ΔM)	7.16		Spectral class	O9.5II (blue)
Pri motion ra	+005		Sec motion ra
Pri motion dec	-003		Sec motion dec
Notes	N K (See Notes, 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 Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		186544	18 15 13 -20 23 17	CHR 255 Aa,Ab	2019	9	156	0.1	6.50	6.90	0.40
Show		186544	18 15 13 -20 23 17	BU 286 AB	2015	12	216	6.1	5.95	13.00	7.05
Show	16 Sgr	186544	18 15 13 -20 23 17	SNA 83 AC	2012	1	27	5.9	5.88	13.43	7.55
Show		186544	18 15 13 -20 23 17	SNA 83 AD	2012	1	281	6.5	5.88	13.04	7.16		<===
Show		186544	18 15 13 -20 23 17	SNA 83 AE	2012	1	242	7.3	5.88	13.20	7.32

Sextuple system
5 estimated visually detectable stars in this system

Constellation	Sagittarius		SAO	186544		HIP	89440		Tycho2	6272-00089-1
Gaia DR2	4094031138050641408		HD	167263		HR	6823		GC	24895
ADS	11191		BD	BD-20 5055		Flamsteed	16 Sagittarii		Flamsteed name	16 Sgr
Distance	2325.58		Distance ly	7586.04

discov_num	notes	refcode
BU 286	16 Sgr. A is a spectroscopic binary.
CHR 255	Aa,Ab: Garmany et al. (1980 ApJ 242, 1063) observed a smoothly-varying
	velocity indicating that the A component is probably a single-lined
	binary with a period of 11 d.
	Lindroos (1985) provided the classification of the B component and	Lnd1985
	determines a distance of 1.2 kpc.	Msn1998a
SNA 83	16 Sgr. SB. See discussion of system by Sana et al. 2014).	Sna2014

refcode	metd	author	reference
Lnd1985	-	Lindroos, K.P.	1985A&AS...60..183L
Lnd1985		A&AS 60, 183, 1985
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
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	BU	Burnham, S.W. (BU 1 - 81)
179	CHR	Center for High Ang. Res. Astronomy (speckle interferometry systems)

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18152-2023	SNA 83	AD	2012	1	281	6.5	5.88	13.04	O9.5II-II	N K	181512.97-202316.7

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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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