IU Aurigae

IU Aurigae
	; A visual band light curve for IU Aurigae, adapted from Özdemir et al. (2003)
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 27m 52.40539s
Declination	+34° 46′ 58.3435″
Apparent magnitude (V)	8.19 to 8.83
Characteristics
Spectral type	B0p + B1Vp + ?
U−B color index	-0.66
B−V color index	0.18
Variable type	Eclipsing binary
Astrometry
Radial velocity (Rv)	9 ± 5 km/s
Proper motion (μ)	RA: −4.479 mas/yr ; Dec.: -9.049 mas/yr
Parallax (π)	0.4786 ± 0.5765 mas
Other designations
	IU Aur, BD+34°1051, HD 35652, HIP 25565, SAO 58059, PPM 70395
Database references
SIMBAD	data

IU Aurigae is a triple star^[6] system in the constellation Auriga, consisting of an eclipsing binary pair orbiting a third component with a period of 335 years.^[7] This system is too faint to be viewed with the naked eye, having a peak apparent visual magnitude of 8.19.^[3] The eclipsing pair form a Beta Lyrae-type semidetached binary of two Bp stars^[3] with a period of 1.81147435 days.^[4] During the primary eclipse, the visual magnitude of the system drops to 8.89, while for the secondary it decreases to 8.74.^[3]^[8] The third component is a massive object with 17–18 M_☉, and may actually be a binary – which would make this a quadruple star system.^[7]

^ Cite error: The named reference Özdemir was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Avvakumova2013 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Mayer1987 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Drechsel1994 was invoked but never defined (see the help page).
^ Cite error: The named reference AAVSOIU was invoked but never defined (see the help page).

[Özdemir-1] Cite error: The named reference Özdemir was invoked but never defined (see the help page).

[GaiaDR2-2] Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).

[Avvakumova2013-3] Cite error: The named reference Avvakumova2013 was invoked but never defined (see the help page).

[Samus2017-4] Cite error: The named reference Samus2017 was invoked but never defined (see the help page).

[SIMBAD-5] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Mayer1987-6] Cite error: The named reference Mayer1987 was invoked but never defined (see the help page).

[Drechsel1994-7] Cite error: The named reference Drechsel1994 was invoked but never defined (see the help page).

[AAVSOIU-8] Cite error: The named reference AAVSOIU was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox J2000
A visual band light curve for IU Aurigae, adapted from Özdemir et al. (2003)^[1]
Constellation	Auriga
Right ascension	05^h 27^m 52.40539^s^[2]
Declination	+34° 46′ 58.3435″^[2]
Apparent magnitude (V)	8.19 to 8.83^[3]
Characteristics
Spectral type	B0p + B1Vp^[3] + ?
U−B color index	-0.66
B−V color index	0.18
Variable type	Eclipsing binary^[4]
Astrometry

Radial velocity (R_v)	9 ± 5 km/s
Proper motion (μ)	RA: −4.479^[2] mas/yr Dec.: -9.049^[2] mas/yr
Parallax (π)	0.4786 ± 0.5765 mas^[2]

Other designations
IU Aur, BD+34°1051, HD 35652, HIP 25565, SAO 58059, PPM 70395^[5]
Database references
SIMBAD	data