16413-4846 SNA 1 Ca,Cb

Coord 2000	16413-4846		Discov num	SNA   1		Comp	Ca,Cb		Coord arcsec 2000	16 41 19.44 -48 45 47.5
Date first	2012		Date last	2012		Obs	1
Pa first	255		Pa last	255.2		P.A. Now (θ)	255.2°
Sep first	0.0		Sep last	0.001		Sep. Now (ρ)	0.001"
Mag pri	7.00		Mag sec	7.20		delta mag (ΔM)	0.2		Spectral class	O6.5V (blue)
Pri motion ra	+012		Sec motion ra
Pri motion dec	-005		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		227049	16 41 20 -48 45 47	SNA 1 Aa,Ab	2016	24	294	0.0	5.71			Y
Show	HD 150136	227049	16 41 20 -48 45 47	MLO 8 AB	2015	12	11	1.7	5.71	8.40	2.69
Show		227049	16 41 20 -48 45 47	DUN 206 AC	2016	30	265	10.2	5.71	6.76	1.05
Show		227049	16 41 20 -48 45 47	HJ 4876 AD	2016	13	161	13.3	5.71	10.50	4.79
Show		227049	16 41 20 -48 45 47	HJ 4876 AE	2010	8	11	18.6	5.71	11.40	5.69
Show		227049	16 41 20 -48 45 47	I 96 AF	2015	6	192	20.8	5.71	12.50	6.79
Show		227048	16 41 19 -48 45 48	SNA 1 Ca,Cb	2012	1	255	0.0	7.00	7.20	0.20		<===
Show		227048	16 41 19 -48 45 48	SNA 1 CG	2012	1	221	4.3	6.30	9.64	3.34

Ninefold system
7 estimated visually detectable stars in this system

Constellation	Ara		SAO	227048		HIP	81696		Tycho2	8334-01505-1
Gaia DR2	5940954898814487168		HD	150135		CD	CD-4811069		Distance	55.71
Distance ly	181.73

discov_num	notes	refcode
MLO 8	AB: A is a spectroscopic binary.
SNA 1	Aa,Ab: The system includes the tightly-bound Aa1,Aa2 pair [primary
	O3V((f*))-3.5V((f+)), secondary O5.5-6V] with P=2.67d, i=49 +/- 5deg,
	e=0. The tertary Ab (spectral type O6.5-7V) orbits the inner pair with
	period 3000-5500d.	Sbe2013
	Aa,Ab: Component masses are estimated at 62.2 +/- 10.0 Msun for Aa1,
	39.5 +/- 6.3 for Aa2, and 33 +/- 12 for Ab.	Sna2013
	Aa,Ab: This is a hierarchical triple system known from spectroscopy
	(Mahy et al. 2012, A&A 540, A97). The outer pair (Aa,Ab) was first
	resolved in the course of the PIONIER survey (Sana et al. 2013). We	Sna2013
	clearly detect the known 1.6" AB pair, but other components of this
	system are outside our field of investigation.	Sna2014
DUN 206	AC: C has variable velocity.
	The C component was observed and appeared to be single.	Msn1998a
SNA 1	Ca,Cb: PIONIER marginally resolved the Aa,Ab pair at 0.95mas. It
	probably corresponds to the 183d SB2 reported by Gamen et al. (2008,
	RevMexAA 33, 54), assuming pi=0.5mas and M = 20Msun (Hohle et al.
	2010, AN 331, 349).	Sna2014

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
SBe2013	Kv j	Sanchez-Bermudez, J., Schodel, R., Alberdi, A., Barba, R.H., Hummel, C.A.,	2013A&A...554L...4S
SBe2013		Maiz Apellaniz, J., & Pott, J.-U.
SBe2013		A&A 554, L4, 2013
Sna2013	Kv j	Sana, H., LeBouquin, J.-B., Mahy, L., Absil, O., DeBecker, M., & Gosset	2013A&A...553A.131S
Sna2013		A&A 553, A131, 2013
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	DUN	Dunlop, J.
3	HJ	Herschel, J.F.W.
52	I	Innes, R.T.A.
56	I	MNRAS 57, 533, 1897 (data also in I__1897b,
56	I	I__1897c)
142	MLO	Walker, G.J.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16413-4846	SNA 1	Ca,Cb	2012	1	255	0.0	7.00	7.20	O6.5V	NV K	164119.44-484547.5

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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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