Hydra

うみへび座

Genitive: Hydrae

Equatorial 1303 sq° Hya

最輝星： Alphard

星図で開くカタログを見る

神話

ヘラクレスが2番目の功業で退治したレルナのヒュドラを表す。首を切り落とすたびに2本の首が生えてくる水蛇。

観測の見どころ

全天で最大の星座で、100度以上にわたって広がる。M48（散開星団）、M68（球状星団）、M83（南の回転花火銀河）、木星の幽霊星雲（NGC 3242）を含む。

主な恒星

20

Alphard

HIP 46390; Alpha Hya; 30 Hya

1.98 mag 284.4″ B: 9.7 K3IIIa

Gamma Hya

HIP 64962; Gamma Hya; 46 Hya

3.00 mag G8IIIa

Zeta Hya

HIP 43813; Zeta Hya; 16 Hya

3.11 mag G8.5III

Nu Hya

HIP 52943; Nu Hya

3.11 mag K1.5III Hdel-0.5

Pi Hya

HIP 68895; Pi Hya; 49 Hya

3.27 mag K1III-IV

Ashlesha

HIP 43109; Epsilon Hya; 11 Hya

3.38 mag 0.2″ B: 5.6 G7III + A8III-IV:

Xi Hya

HIP 56343; Xi Hya

3.54 mag 74.6″ B: 10.7 G7III

HIP 49841; Lambda Hya; 41 Hya

3.61 mag K0III CN+1

Mu Hya

HIP 51069; Mu Hya; 42 Hya

3.81 mag K4III

Theta Hya

HIP 45336; Theta Hya; 22 Hya

3.88 mag 20.6″ B: 9.9 A0V

HIP 41307

3.90 mag A1V

Ukdah

HIP 47431; Iota Hya; 35 Hya

3.91 mag K2 III

Zhang

HIP 48356; Upsilon1 Hya; 39 Hya

4.12 mag G7-III

Delta Hya

HIP 42313; Delta Hya; 4 Hya

4.16 mag 2.7″ B: 10.7 A1Vnn

Beta Hya

HIP 57936; Beta Hya

4.28 mag 0.6″ B: 5.5 B9IIIpSi

Eta Hya

HIP 42799; Eta Hya; 7 Hya

4.30 mag B3V

12 Hya

HIP 43067; 12 Hya

4.32 mag G8-IIIFe-1

Rho Hya

HIP 43234; Rho Hya; 13 Hya

4.36 mag 12.2″ B: 11.9 A0Vn

58 Hya

HIP 72571; 58 Hya

4.41 mag K4III

Minchir

HIP 42402; Sigma Hya; 5 Hya

4.44 mag K1+III

二重星

15

HIP 66400

5.78 mag 10.2″ B: 6.6 A7III

HIP 56280

5.64 mag 9.6″ B: 5.7 F8V

17 Hya

HIP 43822; 17 Hya

6.67 mag 4.0″ B: 6.9 A2m

HIP 43798

5.75 mag 64.2″ B: 7.2 K2-3III

20 Hya

HIP 44961; 20 Hya

5.46 mag 7.8″ B: 9.2 G8II

54 Hya

HIP 72197; 54 Hya

4.94 mag 8.1″ B: 7.2 F2III-IV

HIP 56620

5.74 mag 3.4″ B: 7.8 K0III

HIP 52795

6.67 mag 65.9″ B: 7.0 A0III

HIP 42951

6.41 mag 4.7″ B: 7.5 F2IV

HIP 51475

6.51 mag 29.4″ B: 10.2 F7III

R Hya

HIP 65835

4.97 mag 3.5 - 10.9 M M7IIIe

Tau Hya

HIP 46509; Tau1 Hya; 31 Hya

4.60 mag 65.7″ B: 7.3 F6V

HIP 53252

5.24 mag 119.6″ B: 9.6 F6V

HIP 59307

6.17 mag 3.8″ B: 8.0 A0V

Theta Hya

HIP 45336; Theta Hya; 22 Hya

3.88 mag 20.6″ B: 9.9 A0V

変光星

5

R Hya

HIP 65835

4.97 mag 3.5 - 10.9 M M7IIIe

V Hya

HIP 53085

6.00 mag 6.0 - 12.3 SRA C

U Hya

HIP 52009

4.82 mag 4.56 - 5.40 SRB C5II

21 Hya

HIP 45184; 21 Hya

6.11 mag 6.11 - 6.58 EA/DM A3III:m+A0V:

LN Hya

HIP 63159

6.62 mag 6.57 - 6.90 SRD F3Ia

深宇宙天体

30

散開星団 (1)

NGC 2548

5.5 mag 54.

球状星団 (1)

NGC 4590

7.8 mag 12.0

銀河 (27)

NGC 5236

7.6 mag 11.2 SABc

NGC 3621

10.0 mag 10.0 SBcd

NGC 3109

10.0 mag 14.5 SBm

NGC 2835

11.0 mag 6.3 Sc

NGC 2784

10.1 mag 5.1 S0

NGC 3717

12.0 mag 5.8 Sb

NGC 2713

11.7 mag 3.9 SBb

NGC 2992

11.9 mag 4.1 Sa

NGC 2811

11.3 mag 2.7 SBa

NGC 2889

11.8 mag 2.0 SABc

NGC 2935

12.0 mag 3.5 Sb

NGC 3054

12.0 mag 3.9 Sb

NGC 3124

12.0 mag 3.2 Sbc

NGC 3145

12.0 mag 3.3 SBbc

NGC 3312

12.0 mag 3.6 Sb

NGC 3390

12.2 mag 4.0 Sb

NGC 3673

12.0 mag 3.5 Sb

NGC 5078

12.0 mag 3.2 Sa

NGC 5085

12.0 mag 3.4 Sc

NGC 5556

12.0 mag 3.1 Scd

IC 4351

12.0 mag 5.6 Sb

NGC 2989

13.0 mag 1.4 SABb

NGC 2993

12.6 mag 1.6 Sa

NGC 5150

13.0 mag 1.4 SBbc

NGC 5464

13.0 mag 1.0 SBm

NGC 2708

14.0 mag 3.0 SABb

NGC 2815

13.0 mag 3.5 SBb

惑星状星雲 (1)

Ghost of Jupiter

NGC 3242

C59

7.8 mag 0.3