Segue un prospetto delle stelle principali della costellazione dell'Idra Maschio, elencate per magnitudine decrescente.
Nome Designazioni Coordinate Magnitudini Dist. (al) Classe spettrale Note B F HD HIP AR Dec vis. ass. β Hyi β 2151 2021 2.82 3.45 24 G2IV stella vicina α Hyi α 12311 9236 2.86 1.16 71 F0V Head Of Hydrus (Testa Dell'Idro) γ Hyi γ 24512 17678 3.26 −0.83 214 M2III Foo Pih δ Hyi δ 15008 11001 4.08 0.99 135 A3V ε Hyi ε 16978 12394 4.12 0.76 153 B9III η2 Hyi η2 11977 8928 4.68 0.57 217 G5III ha un pianeta ν Hyi ν 18293 13244 4.76 −0.26 329 K3III ζ Hyi ζ 17566 12876 4.83 0.05 295 A2IV/V λ Hyi λ 4815 3781 5.09 1.10 205 K5III μ Hyi μ 16522 11757 5.27 0.51 292 G4III θ Hyi θ 19400 14131 5.51 −0.52 525 B8III/IV ι Hyi ι 21024 15201 5.51 3.17 96 F4III π1 Hyi π1 14141 10418 5.57 −1.21 739 M1III π2 Hyi π2 14287 10513 5.67 −0.11 468 K2III HD 20313 20313 14521 5.67 1.26 248 F2II-III HD 10615 10615 7921 5.70 0.42 371 K2/K3III HD 8810 8810 6631 5.92 −1.53 1009 M0III HD 1801 1801 1706 5.96 −0.69 697 K3III HD 21722 21722 15968 5.96 2.99 128 F3V κ Hyi κ 15248 11095 5.99 1.05 318 K0III HD 9896 9896 7387 6.03 3.00 132 F2V τ2 Hyi τ2 11604 8366 6.05 2.09 202 F0III HD 11995 11995 8983 6.07 2.73 152 F0IV/V HD 12477 12477 9318 6.09 0.50 428 K2III HD 10042 10042 7271 6.11 0.46 441 G3IV HD 19940 19940 14547 6.12 1.30 300 K1III HD 21563 21563 15840 6.14 −0.17 595 A4:V+... σ Hyi σ 12363 8991 6.15 3.07 135 F5/F6IV/V HD 10052 10052 7506 6.18 −0.78 805 M3III HD 24188 24188 17543 6.26 0.50 463 B8V τ1 Hyi τ1 10859 7879 6.33 0.91 395 G6/G8III HD 12270 12270 9149 6.36 0.28 535 G8II/III HD 11944 11944 8957 6.43 2.73 179 F2V HD 1221 1221 1268 6.49 −0.18 704 G8/K0III η1 Hyi η1 11733 8751 6.77 −0.03 748 B9V GJ 3021 1237 1292 6.59 ha un pianeta
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