Boötes

Boötes

Constellation
List of stars in Boötes
Abbreviation	Boo
Genitive	Bootis
Right ascension	15
Declination	+30
Area	907 sq. deg. (13th)
Meteor showers	January Bootids June Bootids Quadrantids
Bordering constellations	Canes Venatici Coma Berenices Corona Borealis Draco Hercules Serpens Caput Virgo Ursa Major
Visible at latitudes between +90° and −50°. Best visible at 21:00 (9 p.m.) during the month of June. Other designations: Arctophylax

Boötes, a name deriving from Egypt, is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy. Boötes is generally referred to as the Bear Watcher, since it appears to be watching over the constellations Ursa Major and Ursa Minor. It contains the third brightest star in the night sky, Arcturus. Note that the "ö" in the name is a diaeresis, not an umlaut.

The constellation is located between 0° and +60° declination, 13 and 16 hours of right ascension on the celestial sphere.

Notable deep sky objects

NGC 5466 is a loose globular cluster that can be observed with most telescopes. It was discovered by William Herschel on May 17, 1784.

Also in the vicinity of Boötes is the Boötes void.

Mythology

Including the fainter stars, Boötes appears to be a large human figure, looking toward Ursa Major [1]. Exactly whom Boötes is supposed to represent is not clear. According to one version, he was a ploughman who drove the oxen in the constellation Ursa Major using his two dogs Chara and Asterion (from the constellation Canes Venatici). The oxen were tied to the polar axis and so the action of Boötes kept the heavens in constant rotation.

Boötes was also supposed to have invented the plough. This is said to have greatly pleased Ceres, the goddess of agriculture who asked Jupiter to give Boötes a permanent fixture in the heavens as a reward for doing this.

Another version portrays Boötes as a grape grower called Icarius, who one day allowed the Roman god Bacchus, also called Dionysus, to inspect his vineyards. Bacchus revealed the secret of wine making to Icarius, who was so impressed by this alcoholic beverage that he invited his friends round to sample it. Having never tasted wine before, they all drank too much and woke up the next morning with terrible hangovers; and they made the mistaken assumption that Icarius had tried to poison them. It was decided that Icarius should pay the price with his own life, and he was swiftly murdered in his sleep. Bacchus placed Icarius in the stars to honor him.

Following another reading the constellation is identified with Arcas, son of Zeus and Callisto. Arcas was brought up by his maternal grandfather Lycaon, to whom one day Zeus went and had a meal. To verify that the guest was really the king of the gods, Lycaon killed his grandson and prepared a meal made from his flesh. Zeus noticed and became very angry, transforming Lycaon into a wolf and gave back life to his son.

In the meantime Callisto had been transformed into a she-bear, by Zeus' wife, Hera, who was angry at Zeus' infidelity. When he was grown up, Arcas met with the she-bear and, since obviously he didn't recognize her as his mother, he began to chase Callisto. Callisto, followed by Arcas, sheltered herself in a temple, a sacred place whose profaners were convicted to death. To avoid such fate, Zeus decided to set them in the sky, Arcas as Boötes and Callisto as Ursa Major.

This is a rare version of the myth surrounding Ursa Major, as the myth usually holds that Arcas is transformed into a bear as well (becoming Ursa Minor), and in such versions Boötes has no part. Ursa Minor, and Ursa Major, are constellations whose identification only originated in later classical Greece, and in Rome, and as such Boötes kept separate associations dating from much earlier.

Boötes was considered to be Atlas by some ancient Greek legends, as well as those in other early mediterranean cultures, since it takes an appropriate position in the sky (its arms near the pole star, but its body standing on/near the ecliptic). As such, together with earlier interpretations of other constellations in the zodiac sign of libra (i.e. of Draco (constellation), Ursa Major and Ursa Minor it may have formed the origin of the myth of the apples of the Hesperides, which forms part of The Twelve Labours of Herakles.

Graphic visualization

File:Bootes constellation map visualization.PNG

Diagram of an alternate way to connect the stars of the constellation Boötes. The herdsman is shown seated and smoking a pipe.

The stars of the constellation Boötes can be connected in an alternative way, which graphically shows the herdsman seated and smoking a pipe.

The stars ε Boötis, δ Boötis, μ Boötis, β Boötis, γ Boötis, ρ Boötis, and σ Boötis form the herdsman's head. In addition, the stars δ Boötis, μ Boötis, and β Boötis may be seen to form a cap.

The stars γ Boötis, λ Bootis, θ Boötis, and κ Boötis form the herdsman's pipe. Star γ Boötis is of the third magnitude and would be the herdsman's mouth.

Stars ε Boötis, ζ Boötis, and α Boötis form the herdsman's body. Star ε Boötis is of the third magnitude whereas star α Boötis, also known as Arcturus, is of magnitude zero.

Stars alpha Bootis, η Boötis and υ Boötis form the herdsman's leg, with η Boötis being the knee. Finally, stars υ Boötis and τ Boötis form the herdsman's foot. Star η Boötis is of the third magnitude.

Reference

• H. A. Rey, The Stars — A New Way To See Them. Enlarged World-Wide Edition. Houghton Mifflin, Boston, 1997. ISBN 0-395-24830-2.

Notable and named stars

BD	F	Names and other designations	Mag.	Ly away	Comments
α	16	Arcturus, Alpha Boötis, Haris-el-sema	−0.05	36.7	< αρκτούρος Bear guard < ? al-haris as-sama The keeper of heaven
ε	36	Epsilon Boötis, Irza, Mirak, Pulcherrima, Mizar	1.76	210	binary star; component magnitudes 2.35, 2.70 < إزار ’izār Girdle < المراق al-maraqq the Loins < pulcherrima Most beautiful
η	8	Eta Boötis, Muphrid	2.68	37	< مفرد الرامح mufrid ar-rāmiħ The (single) one of the lancer
γ	27	Gamma Boötis, Seginus, Haris	3.03	85.2	Haris in Bečvář Delta Scuti variable
δ	49	Delta Boötis	3.46	117
β	42	Beta Boötis, Nekkar, Meres	3.49	219	< mistranscription of بقّار baqqār Cattle driver
ρ	25	Rho Boötis, Al Hamalain	3.57	149	< الحملين al-hamalayn the Two Sheep/Rams
ζ	30	Zeta Boötis	3.78	181	double star; component magnitudes 4.43, 4.83
θ	23	Theta Boötis, Asellus primus	4.04	47.5	"the first donkey"
υ	5	Upsilon Boötis	4.05	245
π1,2	29	Pi Boötis	4.15	317	binary star; component magnitudes 4.49, 5.58
λ	19	Lambda Boötis	4.18	97.1
μ1,2	51	Mu Boötis, Alkalurops, Inkalunis, Clava, Venabulum	4.18	121	double star; component magnitudes 4.31, 6.51 < Arabic < καλαύροψ Shepherd's staff
κ1,2	17	Kappa Boötis, Asellus tertius	4.38	155	"the third donkey" binary star, component magnitudes +4.53, +6.62
σ	28	Sigma Boötis, Al Hamalain	4.47	50.4	< الحملين al-hamalayn the Two Sheep/Rams
τ	4	Tau Boötis	4.50	50.8	has a planet
ψ	43	Psi Boötis	4.52	250
ξ	37	Xi Boötis	4.54	21.8	BY Draconis variable
ο	35	Omicron Boötis	4.60	225
ι	21	Iota Boötis, Asellus secundus	4.75	97.2	"the second donkey" triple star system Delta Scuti variable
ω	41	Omega Boötis	4.80	360
A		A Boötis	4.80	223
d	12	12 Boötis	4.82	120
i	44	44 Boötis	4.83	41.6	W Ursae Majoris variable
	34	34 Boötis	4.83	890
	20	20 Boötis	4.84	191
	31	31 Boötis	4.86	576
e	6	6 Boötis	4.92	368
c	45	45 Boötis	4.93	64.3
ν²	53	Nu2 Boötis	4.98	430
	9	9 Boötis	5.02	648
ν¹	52	Nu1 Boötis	5.04	872
φ	54	Phi Boötis, Ceginus	5.25	163
	13	13 Boötis, CF Boötis	5.26	557	irregular variable
χ	48	Chi Boötis	5.28	227
	15	15 Boötis	5.29	255
	50	50 Boötis	5.38	247
	33	33 Boötis	5.39
f	22	22 Boötis	5.40	287
	18	18 Boötis	5.41
	14	14 Boötis	5.53
	32	32 Boötis	5.55
g	24	24 Boötis	5.58	308
k	47	47 Boötis	5.59	260
	2	2 Boötis	5.63
	40	40 Boötis	5.64
b	46	46 Boötis	5.67	420
	39	39 Boötis	5.68
	7	7 Boötis	5.71
	1	1 Boötis	5.73
	10	10 Boötis	5.76
h	38	38 Boötis, Merga, El Mara el Musalsela, Falx Italica	5.79	153	< المرأة المسلسلة al-mar’a[tu] al-musalsalah The chained woman < falx ītalica Bill hook
	26	26 Boötis	5.91
	3	3 Boötis	5.97
	11	11 Boötis	6.23
		HD 128311	7.48	54.1	has two planets

Source: The Bright Star Catalogue, 5th Revised Ed., The Hipparcos Catalogue, ESA SP-1200

External links

• The Deep Photographic Guide to the Constellations: Bootes