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S A G I T T A R I U S

 

ori.gif (1448 bytes) Mythology and history

Mythology of Sagittarius

       Sagittarius or the arch man, from mythology, this constellation is the image of the centaur Chiron, a being who distinguished of the others by his wisdom and knowledge. It was born of the loves between Cronos and the Filira nymph, and had the strange form of half man, half horse, because his father had to become horse to generate it. According to the legend, her mother when seeing that she had generated a monster requested the Gods that transformed it, being turned linden tree

                Chiron was taught by Apolo and Artemisa in the art of the medicine and the hunting, establishing a consultation in a grotto and its disciples was numerous: Cástor, Pollux, Ulises, etc. In the course of a combat it was hurt by an arrow soaked in the blood of the Hidra Lerna, which produced terrible pains to him. Since he was inmortal, it did not want to continue living with a perpetual agony, reason why with the consent of the Gods it shortly after offered his immortality to Prometheus, expiring. Zeus put between the stars of the sky constituting the constellation of Sagittarius (the arch man).

 

ori.gif (1448 bytes) Characteristics

           Sagittarius or the arch man is a spectacular square constellation of 700º located in the observable South hemisphere from almost all the planet, but logically in in the South hemisphere we can contemplate it in its maximum splendor. In the South hemisphere he is observable during the months of autumn, winter and spring; however for the inhabitants of the North hemisphere he is observable during the warm nights of summer to low height on the horizon.

            The constellation of Sagittarius has the particularitity of which the equator of the Milky Route crosses the constellation in two parts, and in addition the center to our galaxy is located to the Southeastern of the same one. The nucleus of the Milky Route is to 30,000 years light of the Sun, therefore, we can take to see towards that distance the nucleus of our galaxy and a great amount of globular, stellar clusters and riquísimos star fields. During the cleared nights of summer, where I write these lines to you is spectacular to see the milky nubecitas of our galaxy on Sagittarius, therefore, it is logical to think that for the inhabitants of the South hemisphere it must be a magnificent spectacle to contemplate it since it culminates in the zenith and it remains more hours on the horizon. The form of the constellation is not resembled a arch man, although it is necessary to have a certain originality to be able to distinguish it, rather, has teapot form.

            Sagittarius is a zodiacal constellation whose ecliptic, or apparent line of movement of the Sun and planets on our celestial vault crosses the constellation of this a the west as you can see down indicated with the red line. During half-full end of December until of January the Sun it remains in this constellation, being called the month of Sagittarius that you can find more information in the Web.

            Sagittarius is fitted in the South hemisphere with the parallel of South 30º cutting the constellation in two halves. It limits the north with the constellations of Aquila (Aql), Scutum (Sct) and Serpens Tail (SCd), to the east with the nonzodiacal constellation but if whose ecliptic crosses it that it is Ophiuchus, to the south with the austral constellations of Corona Australis and Telescopium, and to the west with the constellations of Microscopium and the zodiacal one of Capricornius.

            The constellation of Sagittarius I located  the 10 to it of October of 1982 at the age of 16 years from the locality of Cán Picafort, Majorca, Spain.

 

 

Constellation of Sagittarius

 

Main stars

       Alpha, a; denominated Rukbat, with a magnitude of 3.96 it is of blue color, is to 473 years light and it reveals to us that the star is a giant 169 times more luminous than the Sun is located in the south of the constellation, near Telescopium, peculiarly is not the star most shining of the constellation.

      Beta, b; denominated Arkab Prior, with a magnitude of 3.96 and blue color, light is to 378 years, and is a giant 46 times more luminous than the Sun, is located to the south of the constellation closely together of Telescopium.

    Gamma, g; denominated Nash, stars orange, of phantom K, whose magnitude is of 3.63 which light of us is to 96 years, is a star 46 times more luminous than the Sun is located in the east of the constellation, closely together of Scorpius, comprises of the end of the teapot, near the parallel of 30º of South latitude.

    Delta, d; denominated Kaus Meridinialis, is giant orange 600 times more luminous than Sun, of phantom K, whose magnitude is of 2.70 which light of us is to 306 years, is located in the center of the constellation, near  g forming part of the asterism of the teapot or in its house of the cover.

 

Other objects

            M 20, spectacular cluster with nebula of denominated emission including popularly like trífidas,  of magnitude 6.3, very easy to locate located closely together of M8, has an angular diameter of 28' of arc and Earth light is to 5,200 years.

           M 8, precious cluster with associated nebula, of magnitude 5.0, popularly has an angular diameter of 80'x60 ' of arc denominated like cloudy Lagoon.

            M 21, precious cluster of magnitude 5.9, 13' of arc of angular diameter that is to 4,200 years Earth light, has a considered age of 4.5 million years, is formed by stars from the eighth magnitude.

            M 23, cluster of magnitude 5.5 located to the north of the constellation, has an angular diameter of 27' of arc and Earth light is to 2,200 years, has a considered age of 220 million years, is a relatively old stellar cluster.

            M 17, associated nebula to cluster denominated swan located to the north of the constellation closely together of Ophiuchus, has an angular diameter of 11' of arc, is to 4,800 years Earth light.

            M 18, cluster located to the south of the previous one of magnitude 6.9 of 9' of arc of angular diameter that dista 3,900 years Earth light, has a considered age of 31 million years.

             M 28, precious globular cluster of magnitude 6.9 located in the center of the constellation has an angular diameter of 15' of arc, is to 18,900 years Earth light.

             M 22, globular cluster next to the previous one of magnitude 5.1 with an angular diameter of 17' of arc, is to 10,000 years Earth light.

             M 54, globular cluster located to the south of the constellation, of magnitude 7.7 of 5,5' of angular diameter that is to 70,000 years Earth light, much more far that the nucleus of our galaxy that dista 30,000 years light, therefore, is in the other part of our galaxy.

            M 69, precious and small globular cluster located to the south of the constellation of magnitude 7.7 and 3,8' of angular diameter, is to 33,000 years Earth light.

             M 55, globular cluster located to the southwest of the constellation with a 7.0 magnitude  of and an angular diameter of 15' of arc, Earth light is to 16,600 years.

             M 75, small globular cluster located to the west of the constellation already closely together with Capricornius, of magnitude 8.6 and 4,6' of arc of angular diameter, is to 60,300 years Earth light.

 

ori.gif (1448 bytes) Observations by telescope

D O U B L E

Nom: H 125 R.A.: 18h.26m.

Dec: -25º05'

Mag: 8.3, 8.3 Sep.: 2.8" P.A.: 105º Nat: ph Spec.: G, G
AOC: 127 DSC: 95 D.D.S.: 16-June-1984

H 125

 

                NOTE: One is in a rich zone. Both components are of the same magnitude, is one double tight one, unfolding itself with the eyeglass of 100x, both components have a smooth yellowish tonality.

 

GLOBULAR CLUSTER

NGC:6624

M: --

R.A.: 18h.20m.

Dec: -30º23'

Mag: 8.6 Dim: 2' AOC: 131 CNAO: 34
D.D.S.: 17-June-1984  

ngc6624

 

                NOTE: One is in a very rich zone. It is located to 50' to the Southeastern south of the star d Sagittari, is a globular cluster of very small size being observed as a small milky spot of complicated identification. An only layer is observed.

 

C L U S T E R

NGC: 6494

M: 23 R.A.: 17h.54m. Dec: -19º01'
Mag: 6.9 Dim: 25' AOC: 141 CNAO: 37
D.D.S.: 27-June-1984  

m23

 

                    NOTE: One is in a very rich zone. One is a precious stellar cluster, formed by seventy stars oriented with angles of position of 120º, with a route of the cluster of 45º. They emphasize the triangles and you triaccept or oriented star groups formed by the three or component ones with a certain angle of position that usually are the sayings previously.

 

D O U B L E

Nom: H 5003 R.A.: 17h.56m.

Dec: -30º15'

Mag: 5.5, 7.0 Sep.: 5.6" P.A.: 103º Nat: f Spec.: M, B
AOC: 142 DSC: 105 D.D.S.: 27-June-1984

h5003

 

                NOTE: One is in a rich zone. There is an evident difference of brightness between the components, the main one I see it red and secondary the blue one, the colors are distinguished perfectly, is unfolded with the eyeglass of 50x. Is precious.

 

C L U S T E R

NGC:6520

M: -- R.A.: 18h.00m. Dec: -24º23'
Mag: 8.1 Dim: 8' x 3' AOC: 143 CNAO: 38
D.D.S.: 27-June-1984  

ngc6520

 

            NOTE: One is in a rich zone. One is a delicate stellar cluster, formed by star infinity oriented in form of indecisive Greek letter l and with the R-90mm.

 

C L U S T E R

NGC:6523

M: R.A.: 18h.02m. Dec: -24º23'
Mag: 6.5 Dim: 50'x30' AOC: 144 CNAO: 39
D.D.S.: 27-June-1984  

DIFUSE NEBULAE

NGC: 6530

M: 8

R.A.: 18h.02m.

Dec: -24º23'

Mag: 6.1 Dim: 10' AOC: 145 CNAO: 40
D.D.S.: 27-June-1984  

D O U B L E

Nom: Arg 31 R.A.: 17h.59m.

Dec: -24º15'

Mag: 7.0,8.5 Sep.: 35" P.A.: 28º Nat: f? Spec.: G, F
AOC: 146 DSC: 106 D.D.S.: 27-June-1984

ngc6523 & Arg21

 

            NOTE: NGC 6523: One is an impressive stellar cluster formed by twenty oriented stars with different angles from pinpoint different you triaccept with form from leaned semicircles one to another one.

            M 8: It is the famous nebula of the Lagoon. One distinguishes two zones of brightness perfectly corresponding to the borders of a Lagoon, of there his name. Although the cloudiness in all the cluster is observable. The corresponding thing to the Lagoon is what emphasizes.

            Arg 31: One is to 30' to the west of M8. A remarkable difference of brightness between the components exists, are slightly separated, the main one I see yellowish and secondary the blue one it.

 

DIFUSE NEBULAE

NGC: 6514

M: 20

R.A.: 18h.00m.

Dec: -23º02'

Mag: 6.9 Dim: 30' AOC: 147 CNAO: 41
D.D.S.: 28-June-1984  

m20

 

                NOTE: One is in a very rich zone. One is a cloudy brilliant in which it honors a star group pertaining to cloudy happiness, it is a diffuse and amorphous nebula. Irregular and it uniforms brilliant without getting to observe plan some.

 

C L U S T E R

NGC:6531

M: 21 R.A.: 18h.02m. Dec: -23º30'
Mag: 6.5 Dim: 10' AOC: 148 CNAO: 42
D.D.S.: 28-June-1984  

m21

 

                NOTE: One is in a very rich zone. One is a precious stellar cluster formed by twenty stars, turns out to be smaller than M23. As direction is possible to emphasize you triaccept in sense the west-northwest to this-Southeastern; I do not observe associated cloudiness, is an cluster that emphasizes, with a moderate concentration towards the center, with a small rank of brightness.

 

GLOBULAR CLUSTER

NGC:6553

M: --

R.A.: 18h.06m.

Dec: -25º56'

Mag: 9.6 Dim: 4' AOC: 149 CNAO: 43
D.D.S.: 28-June-1984  

ngc6553

 

                    NOTE: One is in a rich zone. One is a very weak globular cluster and for that reason he is something complicated to identify it. It is observed like a small somewhat blurred nubecita, it has a strong gradient, it is observed a layer uniforms corresponding to the nucleus.

 

C L U S T E R

NGC: 6603

M: 24 R.A.: 18h.15m. Dec: -18º27'
Mag: 9.0 Dim: 4' AOC: 150 CNAO: 44
D.D.S.: 28-June-1984  

D O U B L E

Nom: Sh 264 R.A.: 18h.16m.

Dec: -18º38'

Mag: 6.4,7.6 Sep.: 18" P.A.: 52º Nat: f? Spec.: A, B
AOC: 151 DSC: 107 D.D.S.: 28-June-1984

m24

 

                NOTE: M 24: Riquísima is in a zone. It is to emphasize that the cluster is not what approximately pretends on the field but small and indecisive nubecilla centered in the center of the false cluster. Therefore, it has a strong concentration towards the center, with a small rank of brightness.

                Sh 264: One is immersed in the false cluster and located to 5' to the northeast of M 24; there is a slight difference of brightness, are something separated, unfolding itself without difficulty with the eyeglass of 50x, the main one I see secondary white it and the bluish one.

 

DIFUSE NEBULAE

NGC:6595

M: --

R.A.: 18h.13m.

Dec: -19º53'

Mag: 7.0 Dim: 8'x5' AOC: 152 CNAO: 45
D.D.S.: 28-June-1984  

ngc6595

 

                NOTE: One is in a rich zone. One is a weak nebula and something small, is irregular and a slight distribution of brightness in plans oriented in sense the north-south.

 

DIFUSE NEBULAE

NGC:6618

M: 17

R.A.: 18h.18m.

Dec: -16º12'

Mag: 9.0 Dim: 4> AOC: 153 CNAO: 46
D.D.S.: 28-June-1984  

m17

 

               NOTE: One is in a rich zone. It is observed several cloudy nuclei oriented in sense the north-south, have irregular form with a distribution of brightness in plans, also in this sense.

 

C L U S T E R

NGC: 6613

M: 18 R.A.: 18h.17m. Dec: -17º09'
Mag: 7.5 Dim: 10> AOC: 154 CNAO: 47
D.D.S.: 28-June-1984  

m18

 

                NOTE: Riquísima is in a zone, is a small one and precious stellar cluster, is not formed by twenty stars without apparent direction some, nor either concentration towards the center is a small rank of brightness.

 

C L U S T E R

IC:4725

M: 25 R.A.: 18h.29m. Dec: -19º16'
Mag: 6.5 Dim: 40' AOC: 155 CNAO: 48
D.D.S.: 28-June-1984  

m25

 

                    NOTE: One is in a rich zone. It is a wonder of stellar cluster with an important amount of traiadas oriented in sense the north-south, is formed by fifty stars with an appreciable concentration towards the center. I do not observe cloudiness towards the center. A moderate rank of brightness exists.

 

C L U S T E R

NGC: 6645

M: -- R.A.: 18h.30m. Dec: -16º53'
Mag: 10.0 Dim: 14'x10' AOC: 156 CNAO: 49
D.D.S.: 28-June-1984  

ngc6645

 

                NOTE: One is in a rich zone. It is a weak stellar cluster and small, with a strong concentration towards the center without associate but indecisive cloudiness with the R-90mm., it has a small rank of brightness.

 

GLOBULAR CLUSTER

NGC:6638

M: --

R.A.: 18h.27m.

Dec: -25º32'

Mag: 10.0 Dim: 2' AOC: 164 CNAO: 54
D.D.S.: 29-June-1984  

ngc6638

 

                NOTE: One is to 40' to the northwest of l Sagittari, it is an observable globular cluster in stellar form with a distribution of uniform density, and with a remarkable gradient.

 

GLOBULAR CLUSTER

NGC:6656

M: 22

R.A.: 18h.33m.

Dec: -23º58'

Mag: 5.8 Dim: 17' AOC: 165 CNAO: 55
D.D.S.: 29-June-1984  

m22

 

                NOTE: One is in a rich zone. It is a pretty globular cluster, it has a strong gradient, are observed three different layers of density corresponding to the nucleus, the crown and the periphery. One is a precious globular cluster.

 

GLOBULAR CLUSTER

NGC:6642

M: --

R.A.: 18h.29m.

Dec: -23º31'

Mag: 7.9 Dim: 7' AOC: 166 CNAO: 56
D.D.S.: 29-June-1984  

ngc6642

 

                NOTE: One is in a rich zone. It is a small globular cluster, is observed an only layer of density corresponding to the nucleus. Its identification is something complicated.

 

D O U B L E

Nom: Arg 32 R.A.: 18h.37m.

Dec: -25º23'

Mag: 8.5, 9.0, 9.0 Sep.(AB): 7.3"

Sep.(AC): 53"

A.P.(AB): 215º

A.P.(AC): 287º

Nat(AB): f

Nat(AC): ?

Spec.: ?, ?, G
AOC: 167 DSC: 111 D.D.S.: 29-June-1984

arg32

 

                NOTE: One is in a rich zone. Components AB are unfolded with the eyeglass of 50x, the colors profit not to identify them, on the other hand, components AC is unfolded with 100x, observing yellowish component C of color, as a whole they form a precious triple.

 

D O U B L E

Nom: WN 6 R.A.: 18h.26m.

Dec: -26º37'

Mag: 6.8, 8.2 Sep.: 42" P.A.: 184º Nat: ? Spec.: A, B
AOC: 168 DSC: 112 D.D.S.: 29-June-1984

wn6

 

            NOTE: One is in a rich zone. One is one double with a slight difference of brightness, and slightly separated, the main one I see secondary white it and the bluish one

 

GLOBULAR CLUSTER

NGC:6809

M: 55

R.A.: 19h.37m.

Dec: -31º03'

Mag: 6.7 Dim: 10' AOC: 370 CNAO: 109
D.D.S.: 21h.44m.(UT); 12-July-1985  

m55

 

                NOTE: One is in a rich zone. It is a shining object although it culminates to low height, he is enormous, pretty, delicate and subtle. It is observed two zones of different density corresponding to the nucleus and to the periphery, it is located without difficulty with the eyeglass of 50x, and one atónico with 200x remains.

 

D O U B L E

Nom: S 710 R.A.: 19h.04m.

Dec: -16º18'

Mag: 5.9, 9.0 Sep.: 6.1" P.A.: 357º Nat:? Spec.: B, B
AOC: 374 DSC: 265 D.D.S.: 22h.43m.(UT); 12-July-1985

s710

 

                NOTE: One is in a zone, very very rich. There is a remarkable difference of brightness between the components, are slightly separated, both components I see them blue, easy to locate is unfolded with the eyeglass of 50x.

 

D O U B L E

Nom: S 715 R.A.: 19h.15m.

Dec: -16º04'

Mag: 7.0, 7.5 Sep.: 8.5" P.A.: 15º Nat:f Spec.:B,A
AOC: 375 DSC: 266 D.D.S.: 22h.53m.(UT); 12-July-1985

D O U B L E

Nom: S 716 R.A.: 19h.15m.

Dec: -16º02'

Mag: 8.4,8.6 Sep.: 5.1" P.A.: 195º Nat: f Spec.: B, B
AOC: 376 DSC: 267 D.D.S.: 22h.53m.(UT); 12-July-1985

S 715 & S 716

 

            NOTE: S 715: One is in a rich zone. There is a small difference of brightness between the components, the main one I see it blue, and the secondary white, is unfolded without difficulty with the eyeglass of 50x.

            S 716: One is to only 2' to the north of S 715. One is one double of weaker components, something narrower, but, also, desdoblabe with the eyeglass of 50x, both components I see them blue.

            As a whole, they form a peculiar panorama of observation.

 

C L U S T E R

NGC: 6774

M: -- R.A.: 19h.14m. Dec: -16º22'
Mag: 6.8 Dim: 28'x12' AOC: 377 CNAO: 110
D.D.S.: 22h.56m.(UT); 12-July-1985  

ngc6774

 

                NOTE: One is in a quite rich zone. It is a shining stellar cluster, and very great, it is located easily, it had a slight concentration towards the center, emphasizing on the field, has a moderate rank of brightness, is formed by an important amount of you triaccept oriented in southwestern-northeast sense.

 

D O U B L E

Nom:S 722 R.A.: 19h.36m.

Dec: -17º01'

Mag: 7.2, 7.4 Sep.: 10" P.A.: 233º Nat: f Spec.: A, A
AOC: 378 DSC: 268 D.D.S.: 23h.10m.(UT); 12-July-1985

s722

 

            NOTE: One is in a very rich zone. There is a smallest difference of brightness. The distance that separates to them is ideal. It is unfolded without difficulty with the eyeglass of 50x, both components I see white them.

 

D O U B L E

Nom: 54e1 R.A.: 19h.37m.

Dec: -16º24'

Mag: 5.4,8.7 Sep.: 46" P.A.: 43º Nat: f Spec.: M, B
AOC: 379 DSC: 269 D.D.S.: 23h.24m.(UT); 12-July-1985

54e1

 

            NOTE: One is in a rich zone. There is a great difference of brightness between the components, the main one I see red and secondary the blue one it. It is unfolded without difficulty with the eyeglass of 50x.

 

GLOBULAR CLUSTER

NGC:6684

M: 75

R.A.: 20h.03m.

Dec: -21º53'

Mag: 8.6 Dim: 2' AOC: 380 CNAO: 111
D.D.S.: 23h.31m.(UT); 12-July-1985  

m75

 

            NOTE: One is in a rich zone. It is a small globular cluster, two layers of different density corresponding to the nucleus and periféria are observed.

 

C L U S T E R

NGC: 6469

M: R.A.: 17h.53m. Dec: -22º21'
Mag: 8.2 Dim: 12' AOC: 925 CNAO: 220
D.D.S.: 22h.35m.(UT); 27-May.-1989  

ngc6469

 

        NOTE: One is in a rich zone. It is formed by fifteen visible stars although the cluster is formed by a fifty. They are oriented in East-West sense. It is an cluster that emphasizes but it does not have a concentration towards the center characteristic of others. It has a moderate rank of brightness, is located to 1,600 parsecs, with a phantom of younger it stars of the B8 type.

 

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