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Bootes

Bootis

Northern 907 sq° Boo

Brightest star: Arcturus

Mythology

The Herdsman or Ploughman, sometimes identified as the inventor of the plough. He drives the Great Bear (Ursa Major) around the pole, hence his name meaning ox-driver.

Observing Highlights

Arcturus is the fourth brightest star in the sky and a striking orange giant. The constellation contains many double stars and the globular cluster NGC 5466. Best seen in spring and summer.

Main Stars

20

Arcturus

HIP 69673; Alpha Boo; 16 Boo

-0.04 mag 0.3″ B: 3.5 K0III CH-1 CN-0.5

Mufrid

HIP 67927; Eta Boo; 8 Boo

2.68 mag 114.3″ B: 10.0 G0IV

Izar

HIP 72105; Epsilon Boo; 36 Boo

2.70 mag 2.8″ B: 4.8 G9II-III

Seginus

HIP 71075; Gamma Boo; 27 Boo

3.03 mag 53.0″ B: 12.7 A7IV+(n)

HIP 74666; Delta Boo; 49 Boo

3.47 mag 104.7″ B: 7.9 G8IV

Nekkar

HIP 73555; Beta Boo; 42 Boo

3.50 mag G8IIIa Fe-0.5

HIP 71053; Rho Boo; 25 Boo

3.58 mag 32.3″ B: 11.5 K3- III

HIP 70497; Theta Boo; 23 Boo

4.05 mag 69.4″ B: 11.5 F7V

HIP 67459; Upsilon Boo; 5 Boo

4.07 mag K5.5III

Xuange

HIP 69732; Lambda Boo; 19 Boo

4.18 mag 9.8″ B: 17.0 A0p

Alkalurops

HIP 75411; Mu Boo; 51 Boo

4.31 mag 109.2″ B: 7.1 F2IVa

Zeta Boo

HIP 71795; Zeta Boo; 30 Boo

4.43 mag 1.2″ B: 4.5 A2III

HIP 71284; Sigma Boo; 28 Boo

4.46 mag 212.8″ B: 10.7 F2V

HIP 67275; Tau Boo; 4 Boo

4.50 mag 1.5″ B: 11.1 F6IV

Kappa Boo

HIP 69483; Kappa2 Boo; 17 Boo

4.54 mag 13.7″ B: 6.6 A8IV

HIP 73745; Psi Boo; 43 Boo

4.54 mag K2III

HIP 72659; Xi Boo; 37 Boo

4.55 mag 5.0″ B: 7.0 G8Ve+K4Ve

HIP 72125; 35 Boo

4.60 mag G8.5III

HIP 69713; Iota Boo; 21 Boo

4.75 mag 38.8″ B: 7.4 A9V

HIP 73695; 44 Boo

4.76 mag 4.7 - 4.9 EW/KW F9-G1Vn

Double Stars

15

Pi Boo

HIP 71762; Pi Boo; 29 Boo

4.94 mag 5.4″ B: 5.8 B9pMnHgSi

HIP 72659; Xi Boo; 37 Boo

4.55 mag 5.0″ B: 7.0 G8Ve+K4Ve
5.12 mag 6.4″ B: 6.8 A0V

HIP 69713; Iota Boo; 21 Boo

4.75 mag 38.8″ B: 7.4 A9V
7.12 mag 25.3″ B: 7.6 A1V

Izar

HIP 72105; Epsilon Boo; 36 Boo

2.70 mag 2.8″ B: 4.8 G9II-III

HIP 66727; 1 Boo

5.75 mag 4.4″ B: 9.6 A1V

Kappa Boo

HIP 69483; Kappa2 Boo; 17 Boo

4.54 mag 13.7″ B: 6.6 A8IV

HIP 71053; Rho Boo; 25 Boo

3.58 mag 32.3″ B: 11.5 K3- III

HIP 72524; 39 Boo

5.69 mag 2.9″ B: 6.7 F6V+F5V
6.51 mag 15.1″ B: 9.6 F5IV
6.06 mag 26.7″ B: 10.6 A0V s
6.12 mag 5.1″ B: 11.1 A2V

Alkalurops

HIP 75411; Mu Boo; 51 Boo

4.31 mag 109.2″ B: 7.1 F2IVa
5.99 mag 118.0″ B: 9.4 K5

Variable Stars

2

HIP 71995; 34 Boo

4.81 mag 4.62 - 4.93 SRB M3-III

HIP 73695; 44 Boo

4.76 mag 4.7 - 4.9 EW/KW F9-G1Vn

Deep Sky Objects

30
Globular Cluster (1)
9.1 mag 11.0
Galaxy (29)
10.2 mag 6.5 SABbc
10.9 mag 3.9 Sc
13.0 mag 5.9 SABc
11.8 mag 3.2 SABa
11.8 mag 3.0 Sc
11.7 mag 2.7 Sab
12.0 mag 4.1 Sc
12.4 mag 3.0 SBbc
13.0 mag 1.3 Sbc
12.7 mag 1.4 SABc
12.2 mag 1.8 Sb
13.6 mag 1.0 Sb
13.1 mag 1.4 SBab
13.0 mag 1.1 Sa
13.0 mag 4.5 SABc
14.0 mag 3.0 SBc
13.0 mag 3.0 Sc
— mag 3.0 SABb
11.8 mag 2.8 SABc
14.0 mag 1.8 Sb
12.3 mag 2.3 Sb
13.0 mag 2.7 Sab
13.0 mag 2.1 Sab
13.0 mag 2.1 Sc
13.0 mag 2.8 Sab
14.0 mag 1.4 Sb
13.0 mag 2.6 Sb
14.0 mag 1.5 Sbc
14.0 mag 1.4 SBb