26 Aurigae

26 Aurigae
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 38m 38.08510s[1]
Declination	+30° 29′ 32.7054″[1]
Apparent magnitude (V)	5.406[2] (6.00 / 6.33)[3]
Characteristics
Spectral type	G8III + A1IV or B9.5V[3]
U−B color index	+0.25[4]
B−V color index	+0.45[4]
Astrometry
Proper motion (μ)	RA: -21.32[1] mas/yr ; Dec.: -10.10[1] mas/yr
Absolute magnitude (MV)	5.815
Orbit[3]
Primary	26 Aur A
Companion	26 Aur B
Period (P)	52.735 ± 0.156 yr
Semi-major axis (a)	0.154 ± 0.001″
Eccentricity (e)	0.653 ± 0.002
Inclination (i)	124.22 ± 0.29°
Longitude of the node (Ω)	127.08 ± 0.38°
Periastron epoch (T)	1974.927 ± 0.026
Argument of periastron (ω); (secondary)	309.07 ± 0.14°
Details
26 Aur A
Mass	2.1 ± 1.0[3] M☉
26 Aur B
Mass	3.0 ± 0.4[3] M☉
Other designations
	26 Aur, BD+30° 963, GC 7002, HD 37269, HIP 26536, HR 1914, SAO 58280, PPM 70656, ADS 4229, CCDM J05386+3030, WDS J05386+3030, TYC 2404-1350-1, GSC 02404-01350
Database references
SIMBAD	data

26 Aurigae is a binary star in the constellation Auriga. Its apparent magnitude is 5.41.^[2]

26 Aurigae is a visual binary. The two stars orbit each other every 52.735 years, separated 0.154″.^[3] The system is made of a G-type red giant, and another star that has been classified as an early B-type main-sequence star to an A-type subgiant star.^[3] The red giant star is brighter, although sometimes the hotter star is considered to be the primary star,^[5] as it is more massive.^[3]

References

1 2 3 4 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
1 2 3 4 5 6 7 8 Rica Romero, F. M. (2008). "Orbital Elements for BU 1240 AB. Nature of the C and D Components". Revista Mexicana de Astronomía y Astrofísica. 44: 137–147. Bibcode:2008RMxAA..44..137R.
1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
↑ Abt, Helmut A. (2008). "Visual Multiples. IX. MK Spectral Types". The Astrophysical Journal Supplement Series. 176: 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529.

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[HIP-1] 1 2 3 4 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.

[TYC2-2] 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.

[RicaRomero-3] 1 2 3 4 5 6 7 8 Rica Romero, F. M. (2008). "Orbital Elements for BU 1240 AB. Nature of the C and D Components". Revista Mexicana de Astronomía y Astrofísica. 44: 137–147. Bibcode:2008RMxAA..44..137R.

[EgUBV-4] 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.

[abt-5] Abt, Helmut A. (2008). "Visual Multiples. IX. MK Spectral Types". The Astrophysical Journal Supplement Series. 176: 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529.