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D R A C O

 

 

ori.gif (1448 bytes) Mythology and history

 

Mitología de Draco

        Sometimes this constellation like a serpent, hipopótamo has been seen, and in old India, like a ccrocodile or a cayman. The image that is used at the moment has his prevail in the Mesopotamia, where it adopted the form of a winged dragoon that, nevertheless, it was greater than the present constellation because it extended until the head of Ursa Major. Nevertheless, the Greek philosopher Such (century VI b. C.) he amputated the wings to him to the dragoon to turn them Ursa Minor, and since then he has not returned to fly.


            In one of histories, Draco represents the dragoon that killed the men of Cadmo, envoys to the source of You plow to look for water. Cadmo killed the dragoon and seeded its Earth teeth. Of the teeth armed men appeared, "the seeded men" or espartas, ancestros of the tebanos.

 

             In another one of the versions, Draco is the Ladón dragoon, died by Heracles. When Heracles was subject to its vote to obey the orders of Euristeo, it was in charge to him that it robbed gold apples of the tree that Gea, the goddess Earth, had given to Hera when this one married Zeus. The Hespérides, daughters of the titan Atlas, had cultivated the tree, and the Ladón dragoon, always watchman, guarded it. Nereo, the old wise person of the sea, noticed Heracles that did not have to take apples he himself, but who would have to look for the aid of the titan Atlas. Heracles shot an arrow to the interior of the garden that the dragoon killed and, this way, opened passage to him to Atlas, that could take apples. Angry by the death of the dragoon, Hera placed the image of Draco in the firmament.


             Another Greek image for Draco is the one of the dragoon that fought next to titanes when they fought against the inhabitants of the Mount Olympus. After ten years of battle, the dragoon faced the Athenian goddess, (Minerva). The goddess took to the beast by the tail and it sent it to the sky. While it flew by airs, knots in the body were done to him and was catched around the celestial North Pole, where the air was so cold that the dragoon was congealed and could not escape of its circumpolar position.

 

Draco y Ursa Minor

         They represent the drawn circumpolar constellations in the funeral camera of Seti I in Luxor. Two of these constellations have been identified with the modern ones: The ox (that are the Great Bear) then circumpolar in Egypt, and the Hipopótamo (Dragoon and the Little Bear).

 

Isis

    Bas-relief that represents Isis, symbolized in the sky by the star to Draconis or Thuban, corresponding to the polestar at the time of the Egyptian Civilization.

 

ori.gif (1448 bytes) Characteristics

           Draco is a precious constellation that is in the North hemisphere next to the celestial pole. The year is circumpolar for the inhabitants of the north being visible throughout. For the inhabitants of the South hemisphere, in inferior latitudes to 10º it is invisible. 20h extends more from the meridian of 10h to the meridian and in declination from North 85º to the zones sureñas of +50º

            It occupies a space of the quite great and irregular sky. It limits the north with Ursa Minor and Camelopardalis, the east and the south with the constellation of Ursa Major, the south with the constellations of Bootes, Hercules, Lyra and Cygnus and to the west with Cepheus.

 

 

Pole and polar circle of ecliptic. North hemisphere

The star of pyramids

        The North Pole of the ecliptic is in the constellation, reason why due to the precession of the equinoxes it does more than five thousand years, at the faraónica time the polestar was Dhuban or to Draconis that was the star that in year 2830 to C. was more near the celestial North Pole.  Then Egypt governed IV dynasty,  and constructors of great pyramid of Geops in Gizeh that considered the position of the star, which it shone to 10' of the celestial pole and oriented opportunely of such form that the passage that descended towards the burial camera, with their opened superior end of such form that could penetrate the luminous ray of a Draconis.

   

    Draco is between 20º to 50º of North latitude corresponding to the equator of the Milky Route, is a zone not very rich in shining stars since they are not more shining than the second magnitude no component of the constellation. Its form is peculiar to the dragoon since it surrounds completely to the Little Bear separating it of the Great Bear, finishing in a visible rhombus or near Fertile valley or to Lyrae, prelude of the spring and boreal summer.

 

 

Constellation of Draco

 

Main stars

       Alpha, a; denominated Thuban, of magnitude 3.60 and white color. It was the polestar 5,000 years ago and it will return it to be within 21,000 years. Light is to 309 years. He is 254 times more shining than the Sun. 

      Beta, b; of Rastaban name, magnitude 3.0 and yellow. Light is to 362 years. It is a giant 800 times more shining than the Sun is to the south of the constellation, next to the constellation of Lyra.

    Gamma, g; denominated Eltanin or head of dragoon, of the magnitude 2.4 and therefore, most shining of the constellation, orange color it was a star of cult for the Egyptian civilization since they saw in him the image of Isis. Earth light is to 147 years. It is a giant 216 times more luminous than the Sun.

    Delta, d;  of 3.20 magnitude and yellow color, denominated nodus secundus, is in the center of the constellation. Earth light is to 100 years.

Other objects

                Draconids, meteor shower  whose Maxima intensity the 9 of October take place.

                Cuadrantids, meteor shower of principles of year with one mediates between 50 and 100 meteors to the hour. Information of both rains and their visual observations exists in the Web that I have made to date.

                M 102, circular  galaxy, S0, of magnitude 9.90 located to the south of the constellation next to Bootes.

           

 

ori.gif (1448 bytes) Observations by telescope

D O U B L E

Nom: y R.A.: 17h.43m.

Dec: 72º11'

Mag: 4.4, 5.7 Sep.: 30" P.A.: 15º Nat:f Spec.:K,B
AOC: 538 DSC: 386 D.D.S.:23h.10m.(UT); 22-March-1986

fi

        NOTE: One is in a poor zone; a small difference of magnitude between the components exists, are slightly separated, is one pretty double, its colors are totally different, is unfolded without difficulty with the eyeglass of 50x.

 

D O U B L E

Nom:OS 163 R.A.: 17h.56m.

Dec: 62º36'

Mag: 7.6, 7.8 Sep.: 56" P.A.: 223º Nat:op Spec.:B,A
AOC: 539 DSC: 387 D.D.S.: 23h.18m.(UT); 22-March-1986

osigma163

            NOTE: One is in a rich zone; in the field there are approximately eleven stars; there is a smallest difference of magnitude, are separated almost 1', which entails that it is one pretty double but something separated, its phantoms are similarities, is one double easy to identify due to the magnitude of both components, is unfolded without difficulty with the eyeglass of 50x.

 

D O U B L E

Nom:S 2273 R.A.: 17h.59m.

Dec: 64º09'

Mag: 6.9, 7.3 Sep.: 21" P.A.: 284º Nat:? Spec.: B, A
AOC: 540 DSC: 388 D.D.S.:23h.20m.(UT); 22-March-1986

sigma2273

        NOTE: One is in a rich zone; a small difference of magnitude between the components exists, are slightly separated, is one pretty double, is unfolded with 50x.

 

D O U B L E

Nom:S 2278 R.A.: 18h.02m.

Dec: 56º25'

Mag: 6.8, 7.3, 8.5 Sep.(AB): 36"

Sep.(AC): 6.0"

P.A.(AB): 26º

P.A.(AC): 146º

Nat(AB): f?

Nat(AC): f?

Spec.:A, B, K
AOC: 541 DSC: 389 D.D.S.: 23h.28m.(UT); 22-March-1986

sigma2278

        NOTE: One is in a partially rich zone; there is a slight difference of brightness between the components AB and something superior in AC; they are slightly separated, although much more together component AC; the triple with the eyeglass of 50x is unfolded, although something costs to unfold AC; one is one pretty double.

 

D O U B L E

Nom: 40 R.A.: 18h.04m.

Dec: 80º00'

Mag: 5.5, 6.0 Sep.: 20" P.A.: 231º Nat:f Spec.: A, B
AOC: 542 DSC: 390 D.D.S.:23h.42m.(UT); 22-March-1986

40

        NOTE: One is in a rich zone; there is small, average magnitude, of brightness difference, are slightly together, easy to locate is unfolded with the eyeglass of 50x. is one pretty double.

 

D O U B L E

Nom:S 2571 R.A.: 19h.32m.

Dec: 78º10'

Mag: 7.6, 8.3 Sep.: 11" P.A.: 21º Nat:? Spec.: B, A
AOC: 543 DSC: 391 D.D.S.: 23h.57m.(UT); 22-March-1986

sigma2571

       

        NOTE: One is in a rich zone; there is a remarkable difference of magnitude, are separated, easy to locate is unfolded with 50x. is one pretty double.

 

D O U B L E

Nom:S 1573 R.A.: 11h.46m.

Dec: 67º36'

Mag: 7.6, 8.8 Sep.: 11" P.A.: 177º Nat:f Spec.: K, B
AOC: 748 DSC: 547 D.D.S.:23h.31m.(UT); 7-Feb.-1987

sigma1573

    

          NOTE: One is in a poor star field; there is a slight difference of magnitude, easy to locate is unfolded with the eyeglass of 50x, the main one I see it orange, however, the secondary one is bluish. It is one pretty double, 6.

 

D O U B L E

Nom:S 1872 R.A.: 14h.39m.

Dec: 58º11'

Mag: 7.0, 7.8 Sep.: 7.7" P.A.: 47º Nat:ph Spec.:A, A
AOC: 767 DSC: 566 D.D.S.: 23h.25m.(UT); 28-March-1987

sigma1872

        NOTE: One is in a partially rich zone, 6; there is a small difference of magnitude, are something together although it is unfolded with 50x, both components are white, is one pretty double, 6.

 

D O U B L E

Nom:S 1878 R.A.: 14h.41m.

Dec: 61º28'

Mag: 6.3, 8.6 Sep.: 4.1" P.A.: 319º Nat:ph Spec.:F,?
AOC: 768 DSC: 567 D.D.S.: 23h.34m.(UT); 28-March-1987

D O U B L E

Nom:S 1882 R.A.: 14h.43m.

Dec: 61º18'

Mag: 6.8, 8.5 Sep.: 12" P.A.: 359º Nat:? Spec.:A, M
AOC: 769 DSC: 568 D.D.S.: 23h.38m.(UT); 28-March-1987

sigma1878

        NOTE: S 1878: A great difference of magnitude between its components exists, meetings like needing the eyeglass are enough 200x to unfold it, and to see itself disabled to observe the colors, even so is one pretty double. Locating the double in Sky Catalogue it indicates to us that the color of the main one is yellow. It is one double that in a century of observation to diminished its angle of position and, however, has increased in 1"its separation.

        S 1882: It has a difference of magnitude very similar to S 1878; although its deployment is simpler, since 50x needs solely, thus we can observe the main white, however, the secondary one astonishes me by surprising, a showy one and strong red color, is one pretty double.

    In general, he is very showy and spectacular to observe two doubles of similar it carves so near the other, with the eyeglass of 50x.

  

 

D O U B L E

Nom: Not catalogue R.A.: 14h.51m.

Dec: 62º00'

Mag: 9.5, 10.5 Sep.: 40" P.A.: 270º Nat:? Spec.:?, ?
AOC: 770 DSC: 569 D.D.S.: 23h.40m.(UT); 28-March-1987

D O U B L E

Nom:Not catalogue R.A.: 14h.52m.

Dec: 61º55'

Mag: 9.0, 11.0 Sep.: 30" P.A.: 80º Nat:? Spec.:?, ?
AOC: 771 DSC: 570 D.D.S.:23h.41m.(UT); 28-March-1987

D O U B L E

Nom: Not catalogue R.A.: 14h.51m.

Dec: 61º30'

Mag: 9.5, 11.0 Sep.: 20" P.A.: 250º Nat:? Spec.:?, ?
AOC: 772 DSC: 571 D.D.S.:23h.41m.(UT); 28-March-1987

ced569 ced570 ced571

        NOTE: They are three doubles that can be observed in this partially rich zone; they are catalogued but not identified in the Sky Catalogue 2000,0, the finding has been accidental, are three weak doubles of brightness, in some almost are weak, as consequence is impossible to identify the colors, are all good separated, with which it is unfolded without difficulty with 50x.

 

D O U B L E

Nom:S 2549 R.A.: 19h.31m.

Dec: 63º12'

Mag: 7.6, 8.0, 9.2 Sep.(AB): 51"

Sep.(AC): 28"

P.A.(AB): 275º

P.A.(AC): 285º

Nat(AB): op

Nat(AC): op

Spec.:A, A,  A
AOC: 807 DSC: 602 D.D.S.: 22h.08m.(UT); 18-June-1987

sigma2549

        NOTE: One is in a very rich zone, 8; there is a smallest difference of magnitude between components AB, although he is much greater in case AC, slightly separated, is unfolded with 50x, the three components are white, and it is a quite pretty triple.

 

D O U B L E

Nom:S 44 App R.A.: 19h.33m.

Dec: 60º03'

Mag: 6.8, 8.4 Sep.: 76" P.A.: 287º Nat:op Spec.:A, B
AOC: 808 DSC: 603 D.D.S.: 22h.12m.(UT); 18-June-1987

D O U B L E

Nom:S 2554 R.A.: 19h.33m.

Dec: 60º10'

Mag: 9.0, 9.5 Sep.: 18" P.A.: 196º Nat:? Spec.:?, ?
AOC: 809 DSC: 604 D.D.S.: 22h.12m.(UT); 18-June-1987

sigma44app

        NOTE: S 44 App: There is a remarkable difference of magnitude, are very separated, slightly superior to 1', the main one is white, however, the secondary one is blue, is pretty a double one, is unfolded with the eyeglass of 50x.

        S 2554: One is to only 7' to the north of S 44 App; there is a slight difference of magnitude between the components, it is also unfolded with 50x, one is one pretty double, profit not to identify the colors.

 

D O U B L E Nom: S 125 R.A.: 13h. 14m. Dec: 67º17'
Mag: 6.5, 6.7, 9.2 Sep.(AB): 178.8"

Sep.(AC): 124.9"

P.A.(AB): 296º

P.A.(AC): 229º

Nat(AB):?

Nat(AC): ?

Spec.: K, K, B
AOC: 936 DSC: 715 D.D.S.:23h.51m.(UT); 20-Jan.-1990

sigma125

        NOTE: One is in a rich zone; there is a smallest difference of brightness between components AB, they are very separated, and they are both of orange color; pair AC is with a remarkable difference of brightness and very separated, unfolding with 50x both, they form an isosceles triangle emphasizing on the field.

 

ori.gif (1448 bytes) Other constellations

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