KU Hydrae

Short description: Star in the constellation Hydra

KU Hydrae

A visual band light curve for KU Hydrae, adapted from Adelman (2006)[1]

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Hydra[2]
Right ascension |  09h 22m 50.856s[3]
Declination | −09° 50′ 19.66″[3]
Apparent magnitude (V) | 6.75[4]
Characteristics
Spectral type | Ap EuCrSr[5]
U−B color index | +0.11[6]
B−V color index | +0.22[6]
Variable type | α2 CVn
Astrometry
Radial velocity (Rv)| 19.6 ± 5.0 km/s
Proper motion (μ)|  RA: −27.94 ± 0.61[3] mas/yr
Dec.: −13.01 ± 0.36[3] mas/yr
Parallax (π)| 6.92 ± 0.61[3] mas
Distance| 470 ± 40 ly
(140 ± 10 pc)
Orbit[7]
Companion| KU Hya B
Period (P)| 52.98(37) yr
Semi-major axis (a)| 0.169(1)″
Eccentricity (e)| 0.074(8)
Inclination (i)| 68.5(6)°
Longitude of the node (Ω)| 202.4(4)°
Periastron epoch (T)| 2020.20(45)
Argument of periastron (ω)
(secondary)| 58.7(3.3)°
Details[8]
KU Hya A
Mass| 2.07 M☉
KU Hya B
Mass| 2.05 M☉
Other designations

BD−09° 2816, HD 81009, HIP 45999, HR 3724, SAO 136799[5]

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.[8]

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.[9] Additional measurements of the position angle and angular separation showed a rapid orbital motion.[10]

## References

1. ↑ Adelman, Saul J. (January 2006). "FCAPT uvby Photometry of the mCP Stars HD 20629, HR 3724, 45 Leo, and HD 192678". Publications of the Astronomical Society of the Pacific 118 (839): 77–83. doi:10.1086/498223. Bibcode: 2006PASP..118...77A.
2. ↑ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific 99 (617): 695–699. doi:10.1086/132034. Bibcode: 1987PASP...99..695R. Vizier query form
3. ↑ 3.0 3.1 3.2 3.3 3.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
4. ↑ 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.
5. ↑ 5.0 5.1 "V* KU Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V*+KU+Hya.
6. ↑ 6.0 6.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
7. ↑ Tokovinin, Andrei et al. (2015-07-17). "Speckle Interferometry at SOAR in 2014". The Astronomical Journal 150 (2). doi:10.1088/0004-6256/150/2/50. Bibcode: 2015AJ....150...50T.
8. ↑ 8.0 8.1 Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I". Revista Mexicana de Astronomía y Astrofísica 46: 263–277. Bibcode: 2010RMxAA..46..263R. http://www.astroscu.unam.mx/rmaa/RMxAA..46-2/PDF/RMxAA..46-2_frica.pdf.
9. ↑ Aitken, Robert Grant (1907). "Two hundred and fifty new double stars: tenth list". Lick Observatory Bulletin 4 (109): 101–106. doi:10.5479/ADS/bib/1907LicOB.4.101A. Bibcode: 1907LicOB...4..101A.
10. ↑ Aitken, Robert Grant (1929). "Measures of 296 A double stars". Lick Observatory Bulletin 14 (413): 62–87. doi:10.5479/ADS/bib/1929LicOB.14.62A. Bibcode: 1929LicOB..14...62A.

* v
* t
* e

Hydra constellation

Stars (list)|

| Bayer|

* α (Alphard)
* β
* γ
* δ
* ε (Ashlesha)
* ζ
* η
* θ
* ι (Ukdah)
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ (Minchir)
* 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 (Felis)
* 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-25
* WASP-36
* WISE 0855−0714

Star clusters|

| Open|

* Messier 48

|

Globular|

* Messier 68
* NGC 5694

Nebulae|

| Planetary|

* Abell 33
* NGC 2610
* NGC 3242

|

Galaxies|

| Messier|

* 83

|

NGC|

* 2555
* 2561
* 2574
* 2583
* 2584
* 2585
* 2590
* 2612
* 2615
* 2616
* 2617
* 2618
* 2642
* 2644
* 2662
* 2665
* 2674
* 2690
* 2695
* 2696
* 2697
* 2698
* 2699
* 2706
* 2708
* 2709
* 2713
* 2716
* 2718
* 2721
* 2722
* 2723
* 2729
* 2754
* 2758
* 2763
* 2765
* 2781
* 2784
* 2811
* 2815
* 2817
* 2835
* 2847
* 2848
* 2850
* 2851
* 2855
* 2858
* 2861
* 2863
* 2864
* 2865
* 2868
* 2876
* 2877
* 2878
* 2881
* 2884
* 2889
* 2890
* 2897
* 2898
* 2900
* 2902
* 2907
* 2917
* 2920
* 2921
* 2924
* 2935
* 2936
* 2937
* 2945
* 2947
* 2951
* 2952
* 2956
* 2960
* 2962
* 2975
* 2983
* 2986
* 2989
* 2992
* 2993
* 2996
* 3025
* 3028
* 3030
* 3037
* 3045
* 3052
* 3054
* 3058
* 3072
* 3076
* 3078
* 3081
* 3085
* 3091
* 3096
* 3109
* 3112
* 3124
* 3127
* 3128
* 3133
* 3138
* 3139
* 3140
* 3141
* 3143
* 3145
* 3146
* 3171
* 3176
* 3178
* 3200
* 3203
* 3208
* 3233
* 3240
* 3280
* 3282
* 3285
* 3290
* 3295
* 3296
* 3297
* 3305
* 3307
* 3308
* 3309
* 3311
* 3312
* 3313
* 3314
* 3315
* 3316
* 3321
* 3331
* 3335
* 3336
* 3355
* 3369
* 3383
* 3390
* 3393
* 3402
* 3404
* 3409
* 3420
* 3421
* 3450
* 3453
* 3463
* 3464
* 3483
* 3585
* 3606
* 3617
* 3621
* 3673
* 3717
* 3885
* 3904
* 3923
* 3936
* 4087
* 4105
* 4106
* 4304
* 4456
* 4806
* 4831
* 4955
* 4965
* 4968
* 4970
* 4980
* 4993
* 5042
* 5048
* 5051
* 5061
* 5078
* 5085
* 5101
* 5135
* 5150
* 5152
* 5153
* 5182
* 5260
* 5264
* 5328
* 5330
* 5393
* 5464
* 5495
* 5556
* 5592
* 5626

Other|

* Arp 7
* ESO 510-G13
* GAMA202627
* IC 4374
* MRC 1138-262
* TN J0924-2201
* Tololo 1247-232

Galaxy clusters|

* Abell 754
* Abell 3411
* Abell 3412

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