Multiple Stars of Hydra - The Night Sky Atlas

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Multiple star listings for each constellation appear below, selected from the Bright Star Catalog 5th edition. All binary and multiple star entries are listed with selected data. Each star has a link to its atlas location via its Harvard Revised (HR) number.

AND
ANT
APS
AQL
AQR
ARA
ARI
AUR
BOO
CAE
CAM
CAP
CAR
CAS
CEN
CEP
CET
CHA
CIR
CMA
CMI
CNC
COL
COM
CRA
CRB
CRT
CRU
CRV
CVN
CYG
DEL
DOR
DRA
EQU
ERI
FOR
GEM
GRU
HER
HOR
HYA
HYI
IND
LAC
LEO
LEP
LIB
LMI
LUP
LYN
LYR
MEN
MIC
MON
MUS
NOR
OCT
OPH
ORI
PAV
PEG
PER
PHE
PIC
PSA
PSC
PUP
PYX
RET
SCL
SCO
SCT
SER
SEX
SGE
SGR
TAU
TEL
TRA
TRI
TUC
UMA
UMI
VEL
VIR
VOL
VUL
 

 
Hydra
The Watersnake (female)
Visible in October before dawn, to June after dusk, best in February.

HR RA
hours
J2000
DEC
degrees
J2000
RA
arcsec
/year
DEC
arcsec
/year
Flam-
steed
Bayer Visual
Mag.
Dist.
Light
Years
Related
HR
Entry
Compo-
nents
Count
Max
Mag
Diff.
Separation
arcsec
Double and multiple star remarks from notes
3269 08h 19m 49.9s +03° 56´ 52" +0.034" -0.030"   6.05     2 0.0 0.2"  
3278 08h 21m 20.2s -01° 36´ 08" -0.017" -0.041"   6.5 362   2 0.7 0.5" 7.1 A, 7.4, 435y, a = 0.654" or 241.4y, a = 0.569".
3321 08h 26m 27.2s -03° 59´ 15" -0.053" -0.061" 2   5.59 116   2 3.8 72.8"  
3337 08h 28m 29.2s -02° 31´ 02" -0.005" -0.016"   6.39 217   5 0.1 0.4" AB 7.1 A5m, 7.2 late F, 53.0y, a = 0.321". C, 10.5v at 18" binary around AB.
3374 08h 32m 33.3s -15° 01´ 46" -0.050" +0.052"   6.38     2 2.1 0.3"  
3410 08h 37m 39.4s +05° 42´ 13" -0.066" -0.007" 4 Delta 4.16 98   2 6.2 243.7"  
3441 08h 41m 43.3s -15° 56´ 36" +0.001" -0.098" 9   4.88 101   2 6.8 31.0" Optical.
3459 08h 43m 40.4s -07° 14´ 01" -0.002" +0.003"   4.62 465   3 4.1 78.9"  
3472 08h 45m 20.8s -02° 36´ 03" +0.005" -0.006"   6.41 652   2 0.7 4.7" Binary. Companion is dF3.
3480 08h 46m 06.9s -11° 00´ 23" -0.018" +0.027"   6.25     2 3.5 2.3"  
3482 08h 46m 46.6s +06° 25´ 08" -0.189" -0.051" 11 Epsilon 3.38 120   6 0.9 0.2" AB 3.8 G5III, 4.7 A8IV or F0V, 15.05y, a = 0.238". Speckle interferometric sep. 0.263-0.272", 1980-3. Combined mag., colors. ABxC, 3.4, 7.8, dF7 at 3" from AB, 890y, a = 4.536". Component D, 12.7v at 19" from A, in hyperbolic orbit about ABC, periastron distance, 29".
3484 08h 46m 22.5s -13° 32´ 52" +0.016" -0.011" 12   4.32 250   2 9.3 19.9"  
3492 08h 48m 26.0s +05° 50´ 16" -0.017" -0.034" 13 Rho 4.36 232   2 8.7 12.4" CPM.
3523 08h 51m 34.5s -07° 10´ 38" -0.044" +0.001" 15   5.54 296   4 1.8 0.9" AB binary. Other components optical.
3526 08h 52m 24.2s +05° 20´ 24" -0.004" -0.015"   6.33     2 3.2 0.8"  
3529 08h 52m 30.7s -13° 14´ 01" +0.025" -0.019"   6.13     2 5.3 33.6"  
3552 08h 55m 29.5s -07° 58´ 13" -0.001" -0.038" 17   6.91 814   2 0.3 4.1" Binary with HR 3553.
3553 08h 55m 29.6s -07° 58´ 16" +0.002" -0.024" 17   6.67 814 (2) 2 0.3 4.1" Binary with HR 3552. Colors for combined light. Blended mag., 6.08V. Levato indicates spectral classes G5III+A0V, both vsini =<50k/s.
3554 08h 55m 12.4s -18° 14´ 29" +0.020" +0.004"   5.75     2 1.2 66.7"  
3573 08h 58m 08.2s +01° 32´ 30" -0.040" -0.005"   6.59     2 5.5 2.5"  
3590 09h 01m 31.4s +05° 38´ 27" -0.028" -0.007"   6.07   2 1.6 269.0" CPM. Companion F3IV.
3630 09h 08m 42.2s -08° 35´ 22" -0.019" -0.002" 19   5.6     2 5.0 1.0"  
3665 09h 14m 21.9s +02° 18´ 51" +0.129" -0.310" 22 Theta 3.88 120   4 7.7 27.1" AB optical.
3681 09h 16m 41.7s -06° 21´ 11" +0.024" +0.006" 23   5.24 407   2 5.6 1.6"  
3704 09h 19m 33.2s -15° 50´ 04" +0.052" -0.046"   5.78   2 5.0 4.1" Binary.
3706 09h 19m 46.4s -11° 58´ 30" -0.030" +0.015" 26   4.79 141   2 7.5 3.4"  
3709 09h 20m 29.0s -09° 33´ 21" -0.014" -0.029" 27   4.8 148   3 1.9 231.8" AB CPM. BC, 6.87v F5V, 9.0v K2V, sep. 9", physical. B, 7.04V, +0.35(B-V), +0.03(U-B), vsini =<60k/s.
3724 09h 22m 50.9s -09° 50´ 20" -0.027" -0.021"   6.53   3 0.1 0.1" AB 7.3 A2, 7.4, 58.93y, a = 0.150". Combined mag., colors.
3744 09h 27m 14.6s -09° 13´ 25" -0.029" +0.001" 29   6.54   3 0.0 0.3" AB combined mag., colors. C, 11.5v at 10.7". All three CPM.
3748 09h 27m 35.2s -08° 39´ 31" -0.014" +0.033" 30 Alpha 1.98 148   3 7.5 283.1"  
3750 09h 27m 46.8s -06° 04´ 16" -0.224" -0.074"   5.38 85   2 0.8 0.2" CPM.
3758 09h 29m 02.2s -01° 15´ 25" -0.073" +0.001"   6.27 271   2 5.0 1.3"  
3759 09h 29m 08.9s -02° 46´ 08" +0.130" -0.015" 31 Tau 1 4.6 45   2 3.0 65.7" CPM.
3794 09h 32m 41.4s +01° 51´ 51" -0.020" -0.038"   6.11     2 0.0 0.1"  
3822 09h 35m 33.7s -19° 35´ 01" -0.038" -0.046"   6.31     2 3.2 51.5"  
3858 09h 41m 17.0s -23° 35´ 30" -0.028" -0.004"   4.77   2 5.2 54.7" Companion G8V, RV +14k/s, optical.
3931 09h 56m 46.5s -26° 33´ 01" -0.114" +0.006"   6.28     2 4.4 3.4"  
3962 10h 03m 41.4s -25° 19´ 00" -0.039" +0.009"   6.7     2 5.5 16.1"  
3963 10h 04m 02.9s -18° 06´ 06" -0.010" -0.002"   5.86   3 1.0 21.2" AC binary. B, 12v at 12" optical. C, 7.0v A0, vsini 50k/s.
3994 10h 10m 35.3s -12° 21´ 15" -0.202" -0.089" 41 Lambda 3.61 120   3 7.7 112.2" Visual companions both optical.
4040 10h 16m 45.6s -20° 40´ 14" -0.127" -0.038"   6.57     2 3.5 1.3"  
4055 10h 19m 16.8s -12° 31´ 41" -0.014" -0.019"   6.0     2 1.3 0.6"  
4073 10h 21m 36.0s -22° 31´ 42" -0.030" +0.006"   6.51 543   2 1.5 1.8"  
4145 10h 34m 00.9s -23° 44´ 43" -0.008" +0.021" 44   5.08 191   2 8.7 19.1"  
4156 10h 36m 16.7s -16° 20´ 40" -0.026" -0.001" Phi 2 6.03     2 7.0 3.4"  
4157 10h 36m 04.6s -26° 40´ 30" +0.009" -0.062"   6.29 163   2 1.0 1.0" 6.7 F4V, 7.5 G0V, 210.1y, a = 0.982". Combined mag., color.
4158 10h 36m 32.4s -12° 13´ 49" +0.268" -0.673"   5.7 67   2 5.1 14.4" Optical.
4218 10h 47m 38.0s -15° 15´ 43" +0.002" -0.014"   6.67 271   3 1.2 74.7"  
4251 10h 53m 29.5s -20° 08´ 20" +0.078" -0.239"   5.24 60   4 4.0 124.5" B, optical.
4282 10h 59m 13.9s -33° 44´ 14" +0.016" -0.043"   5.71     2 3.0 1.8"  
4302 11h 02m 24.4s -26° 49´ 53" +0.065" -0.120"   6.23   2 0.1 0.2" Unresolved by speckle interferometry.
4314 11h 05m 19.9s -27° 17´ 37" -0.188" -0.004" Chi 1 4.94 75   2 0.1 0.2" 5.6 F4V, 5.7 F4V, 7.40y, a = 0.140". Combined mag., colors.
4443 11h 32m 16.1s -29° 15´ 48" -0.014" +0.138"   5.81 250   2 0.1 9.3" CPM with HR 4444.
4444 11h 32m 16.3s -29° 15´ 40" -0.028" +0.145"   5.64 250   2 0.1 9.3" CPM with HR 4443. Combined colors. Combined mag. 5.00V.
4450 11h 33m 00.1s -31° 51´ 28" -0.206" -0.040" Xi 3.54 120   2 7.0 68.2"  
4469 11h 36m 35.0s -33° 34´ 12" +0.040" -0.037"   5.74     3 2.1 3.3"  
4503 11h 41m 44.0s -32° 29´ 59" +0.004" -0.042"   5.22 217   4 3.1 67.0" AC CPM. C, 8.44V, +0.50(B-V), +0.035(U-B), F7V.
4552 11h 52m 54.6s -33° 54´ 29" -0.050" +0.005" Beta 4.28 326   2 0.9 0.8"  
4579 11h 58m 54.4s -25° 54´ 32" -0.027" -0.019"   6.43   2 0.2 0.2" Doubtful if double.
4612 12h 05m 56.7s -35° 41´ 38" -0.031" -0.002"   6.23     2 7.7 25.4"  
4628 12h 10m 02.5s -34° 42´ 18" -0.052" -0.018"   6.17 543   2 1.8 3.4"  
4651 12h 13m 36.7s -33° 47´ 34" -0.006" -0.011"   6.33   2 1.8 1.6" CPM.
4803 12h 37m 42.2s -27° 08´ 20" +0.076" -0.091"   5.45 88   2 5.9 1.4"  
4978 13h 11m 39.2s -26° 33´ 06" -0.068" +0.004"   6.5   2 0.1 0.2" 7.2 A5V, 7.3 A5V, 19.0y, a = 0.118". Combined mag., color.
5020 13h 18m 55.3s -23° 10´ 18" +0.064" -0.045" 46 Gamma 3.0 120   2 6.7 138.4"  
5080 13h 29m 42.8s -23° 16´ 53" -0.056" +0.016"   4.97     2 8.5 21.2"  
5120 13h 36m 48.4s -26° 29´ 42" -0.091" +0.021"   5.78 155   4 1.0 10.1" AB binary. B is A7IV.
5146 13h 41m 30.9s -23° 26´ 59" -0.009" +0.003"   6.59   3 0.0 0.1" AB combined mag., colors.
5356 14h 19m 00.8s -25° 48´ 56" -0.372" +0.350"   5.87 63   3 5.1 64.0" AB CPM. B, 13.3v at 3".
5407 14h 28m 10.4s -29° 29´ 30" -0.024" -0.023" 52   4.97   4 0.0 0.1" ABxC, CPM. C, 10.0v at 4".
5497 14h 46m 00.1s -25° 26´ 35" -0.150" -0.104" 54   4.94 66   2 2.0 8.5" Binary, components F0V, G1V.
5577 14h 58m 39.2s -27° 39´ 26" -0.042" -0.010" 59   5.65 407   2 0.3 0.4" 6.3 A4V, 6.6 A6V, 339.3y, a = 0.93". Combined mag., colors.

The night sky atlas creates images of any part of the night sky, allowing easy location of any object. Detailed chart images show all stars visible to the naked eye, the constellations, Messier objects, and names of the brightest stars. Data sources: Bright Star Catalog from the Astronomical Data Center, star names list from Steven Gibson, all-sky Milky Way image by Axel Mellinger. The data used in this product, in whole or in part, is used with permission of The NGC/IC Project LLC. Many thanks go to those who maintain and make available their astronomy datasets without which this sky atlas would not have been possible. Permission for any use of these chart images is granted, provided that the original website address remains visible on all images. Enjoy!