KU Hydrae

KU Hydrae
Observation data Epoch J2000 Equinox J2000
Constellation	Hydra^[1]
Right ascension	09^h 22^m 50.856^s^[2]
Declination	−09° 50′ 19.66″^[2]
Apparent magnitude (V)	6.75^[3]
Characteristics
Spectral type	Ap EuCrSr^[4]
U−B color index	+0.11^[5]
B−V color index	+0.22^[5]
Variable type	α² CVn
Astrometry

Radial velocity (R_v)	19.6 ± 5.0 km/s
Proper motion (μ)	RA: −27.94 ± 0.61^[2] mas/yr Dec.: −13.01 ± 0.36^[2] mas/yr
Parallax (π)	6.92 ± 0.61^[2] mas
Distance	470 ± 40 ly (140 ± 10 pc)

Orbit^[6]
Companion	KU Hya B
Period (P)	53.199 ± 0.193 yr
Semi-major axis (a)	0.165 ± 0.011″
Eccentricity (e)	0.038 ± 0.037
Inclination (i)	67.1 ± 4.1°
Longitude of the node (Ω)	23.7 ± 3.6°
Periastron epoch (T)	1957.346 ± 0.572
Details^[6]
KU Hya A
Mass	2.07 M_☉
KU Hya B
Mass	2.05 M_☉
Other designations
KU Hya, BD−09° 2816, HD 81009, HIP 45999, HR 3724, SAO 136799,^[4] A 1342^[7]
Database references
SIMBAD	data

KU Hydrae is a binary star in the constellation Hydra. The primary star is an Alpha2 Canum Venaticorum variable with its apparent magnitude varying from 0.05 magnitudes over a period of 33.97 days.^[6]

This star was discovered to be a visual binary star by Robert Grant Aitken in 1906 and was given the double star designation A 1342.^[7] Additional measurements of the position angle and angular separation showed a rapid orbital motion.^[8]

References

↑ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. Vizier catalog entry
↑ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
1 2 "V* KU Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-01.
1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
1 2 3 Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I" (PDF). Revista Mexicana de Astronomía y Astrofísica. 46: 263–277. Bibcode:2010RMxAA..46..263R.
1 2 Aitken, Robert Grant (1907). "Two hundred and fifty new double stars: tenth list". Lick Observatory bulletin. 4 (109): 101–106. Bibcode:1907LicOB...4..101A. doi:10.5479/ADS/bib/1907LicOB.4.101A.
↑ Aitken, Robert Grant (1929). "Measures of 296 A double stars". Lick Observatory bulletin. 14 (413): 62–87. Bibcode:1929LicOB..14...62A. doi:10.5479/ADS/bib/1929LicOB.14.62A.

Stars of Hydra
Bayer	α (Alphard) β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ¹ τ² υ¹ (Zhang) υ² φ¹ φ² φ³ χ¹ χ² ψ ω
Flamsteed	1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (E) 59 60 3 Crt (b¹) 5 Crt (b²) 6 Crt (b³) 8 Crt 10 Crt 17 Crt (N) 18 Crt 20 Crt 22 Crt 23 Crt 26 Crt 29 Crt 14 Lib 30 Mon (C) 31 Mon (F) 2 Sex
Variable	R S U V W X RT RW RX SX SZ TT TW VX VZ WZ AI AV CT DF EX EZ FG GK HQ HS II IL IY KU KZ LN LO LQ LR LV LX MO MX NS OY QT V335 V355 V406 V419 V478
HR	3212 3269 3271 3272 3285 3288 3295 3305 3338 3342 3374 3378 3383 3392 3411 3446 3458 3478 3480 3486 3493 3526 3529 3538 3554 3557 3564 3578 3584 3590 3596 3636 3638 3649 3651 3653 3675 3687 3704 3714 3741 3749 (G) 3750 3758 3760 3762 3763 3767 3772 3785 3788 3794 3796 3801 3802 3805 3808 3810 3822 3848 3858 (I) 3862 3908 3919 3921 3923 3931 3963 3965 3977 3986 3988 3991 4005 4011 4055 4068 4071 4076 4117 4123 4130 4149 4152 4157 4158 4162 4172 4190 4225 4261 4282 4298 4307 4328 4331 4339 4346 4373 4445 4498 4525 4542 4548 4553 4558 4579 4612 4628 4651 4723 4735 4774 4803 4810 4839 4857 4860 4918 4978 5090 5097 5098 5120 5128 5166 5167 5197 5209 5228 5246 5265 5309 5314 5324 5356 5399 5565
HD	68667 72659 74156 74685 75098 75217 76027 76478 78614 79481 79994 82943 83352 86226 86264 88806 90156 97344 105113 106500 107869 117033 121758 125279
Gliese	Gliese 357 Gliese 433 Gliese 453 GJ 2066 GJ 3517 GJ 3634
Other	BD -3 2525 BD-22 3467 CE 315 EC 14026-2647 HAT-P-35 HAT-P-42 HE 1327-2326 IRC -20197 Kelu-1 LHS 2065 LHS 3003 2MASS 0835-08 2MASS 1114-2618 PSR B0820+02 PSR B0834+06 TWA 5 WASP-15 WASP-25 WASP-36 WISE 0855−0714
List

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