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HD 34557 - Wikipedia

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HD 34557
Observation data Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05^h 20^m 14.66904^s^[1]
Declination	+41° 05′ 10.3522″^[1]
Apparent magnitude (V)	5.52^[2] (5.58 + 8.55)^[3]
Characteristics
Spectral type	A3V^[4]
U−B color index	+0.04^[2]
B−V color index	+0.11^[2]
Astrometry

Radial velocity (R_v)	22±4.2^[5] km/s
Proper motion (μ)	RA: −18.97^[1] mas/yr Dec.: −53.43^[1] mas/yr
Parallax (π)	11.77 ± 0.58 mas^[1]
Distance	280 ± 10 ly (85 ± 4 pc)

Details

Radius	1.6^[6] `R`_☉
Rotational velocity (v sin i)	217^[7] km/s

Other designations
BD+40° 1253, HD 34557, HIP 24902, HR 1738, SAO 40248.
Database references
SIMBAD	data

HD 34557 is a double star in the northern constellation of Auriga. The fainter star has an angular separation of 0.380″ from the primary component.^[3] They have a combined apparent magnitude of 5.52,^[2] making HD 34557 faintly visible to the naked eye from dark skies. Based upon parallax measurements made with the Hipparcos satellite, this system is roughly 280 light years away.^[1] The primary component is spinning rapidly, with a projected rotational velocity of 217 km/s.^[7] It has a stellar classification of A3V,^[4] making it an A-type main sequence star.

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (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, S2CID 18759600
^ ^a ^b ^c ^d Deutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976), "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations", Astrophysical Journal Supplement Series, 30: 97–225, Bibcode:1976ApJS...30...97D, doi:10.1086/190359
^ ^a ^b Eggleton, P. P.; et al. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
^ ^a ^b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
^ ^a ^b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298

References

Constellation of Auriga

Stars

Bayer	α (Capella) β (Menkalinan) γ (Elnath) δ ε (Almaaz) ζ (Saclateni) η (Haedus) θ (Mahasim) ι (Hassaleh) κ λ (Alhurr) μ ν ξ ο π ρ σ τ υ φ χ ψ¹ ψ² ψ³ ψ⁴ ψ⁵ ψ⁶ ψ⁷ ψ⁸ ψ⁹ ω
Flamsteed	2 5 6 9 12 14 16 18 19 22 26 28 36 38 39 40 41 42 43 45 47 49 51 53 54 59 60 62 63 64 65 66 35 Cam
Variable	R T RT (48) RW SU UU WW AB AE AR (17) EO IQ IU LY MZ NO NY PU QZ V352 V361 V394 V420 V433 V538
HR	1558 1615 1738 1752 1794 1795 1822 1825 1866 1884 1938 1945 2028 2096 2137
HD	33203 33463 35619 43691 45350 (Lucilinburhuc) 49674 (Nervia)
Other	Gliese 268 HAT-P-9 (Tevel) KELT-2 MWC 480 SGR 0501+4516 UGPS J0521+3640 WASP-12

Exoplanets	HAT-P-9b (Alef) HD 40979 b HD 43691 b HD 45350 b HD 49674 b KELT-2Ab WASP-12b

Star
clusters

NGC	1664 1893 1907 1931 2240 2281
Other	Messier 36 Messier 37 Messier 38 Palomar 2

Nebulae

NGC	1985 2242
Other	IC 405 IC 2149 Westbrook Nebula

Galaxies	3C 147 4C +41.17 DA 193 MCG +08-11-011

Galaxy clusters	MACS J0717.5+3745