05279+3447 HDS 721 AB

Coord 2000	05279+3447		Discov num	HDS 721		Comp	AB		Coord arcsec 2000	05 27 52.40 +34 46 58.3
Date first	1991		Date last	2018		Obs	14
Pa first	214		Pa last	221.4		P.A. Now (θ)	221.4°
Sep first	0.1		Sep last	0.131		Sep. Now (ρ)	0.131"
Mag pri	8.63		Mag sec	9.99		delta mag (ΔM)	1.36		Spectral class	O9.5V+B0 (blue/blue-white)
Pri motion ra	+001		Sec motion ra
Pri motion dec	+000		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		58059	05 27 52 +34 46 58	HDS 721 AB	2018	14	221	0.1	8.63	9.99	1.36		<===
Show	IU Aur	58059	05 27 52 +34 46 58	MZA 44 AC	2018	1	162	4.0	8.30	17.20	8.90
Show		58059	05 27 52 +34 46 58	MZA 44 AD	2018	1	122	3.6	8.30	16.20	7.90

Quadruple system
4 estimated visually detectable stars in this system

Var name	IU Aur		Constellation	Auriga		SAO	58059		HIP	25565
Tycho2	2411-01941-1		HD	35652		BD	BD+34 1051		Distance	219.78
Distance ly	716.92

discov_num	notes	refcode
HDS 721	The classification is from Mammano et al. (1977 A&A 59, 9), and
	because the stars are are classified as B-type we have not included
	this system in our distributions for the O-stars. Harries et al.
	(1998 MNRAS 295, 386) discuss the inner double-lined system and
	evidence of a near tertiary in a 294-day orbit. The distant, fourth
	star was detected both by us (on the suggestion of B. Schaeffer) and	HIP1997a
	Hipparcos.	Msn1998a
	Primary is IU Aur, a Beta Lyr type eclipsing binary, P = 1.81147d.	Zas2012

refcode	metd	author	reference
HIP1997a	Hh -	Hipparcos	1997yCat.1239....0E
HIP1997a		Hipparcos Catalog, ESA SP-1200, 1997 (incl. Hp photometry, vol. 10)
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
Zas2012	-	Zasche, P.	...................
Zas2012		private communication, 2012

idgroup	discov	author
1	HDS	Hipparcos Double Star (from additional DD list)
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
05279+3447	HDS 721	AB	2018	14	221	0.1	8.63	9.99	O9.5V+B0.	N	052752.40+344658.3

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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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