mercredi 3 septembre 2008

Argo Navis 9, Puppis



Puppis is one of the three constellations that use to form the huge constellation Argo Navis, the ship of the Argonauts. In 1763 Nicolas Louis de Lacaille divided the gigantic Argo Navis into three constellations: Carina (the Keel), Puppis (the Stern, or Poop deck), and Vela (the Sail). Puppis is the largest constellation associated with the former constellation Argo Navis.

Others think that the constellation represents the ship of the Greek warrior Menelaus, husband of Helen. Menelaus sailed his ship home from the Trojan Wars.
"The Stern", is the largest constellation associated with the former constellation "Argo Navis", the Argonauts' Ship.
It was Nicolas Louis de Lacaille who dismantled the older constellation in the mid-eighteenth century, breaking it into four smaller constellations: Carina, Pyxis, Puppis, and Vela.
Not only quite large, the constellation spans a rich area of the Milky Way, guaranteeing the amateur astronomer a number of fine objects to study.
Since the constellation is part of an older one, it has few Bayer stars.
Double stars:
9 Puppis is a very close binary with rapid orbit of only 23.18 years. Currently the values are: 5.6, 6.2; PA 315º, separation 0.4".
k1 Puppis and k2 Puppis form a noted system of nearly equal stars: 4.5, 4.7; PA 318º, separation 9.9".
Note that the name here is "k" not "kappa"; many of Puppis' stars are English labels.

Puppis, "The Stern", is the largest constellation associated with the former constellation "Argo Navis", the Argonauts' Ship.
It was Nicolas Louis de Lacaille who dismantled the older constellation in the mid-eighteenth century, breaking it into four smaller constellations: Carina, Pyxis, Puppis, and Vela.
Not only quite large, the constellation spans a rich area of the Milky Way, guaranteeing the amateur astronomer a number of fine objects to study.
Since the constellation is part of an older one, it has few Bayer stars.
Double stars:
9 Puppis is a very close binary with rapid orbit of only 23.18 years. Currently the values are: 5.6, 6.2; PA 315º, separation 0.4".
k1 Puppis and k2 Puppis form a noted system of nearly equal stars: 4.5, 4.7; PA 318º, separation 9.9".
Note that the name here is "k" not "kappa"; many of Puppis' stars are English labels.
Variable stars:
Rho Puppis is a delta Scuti type variable: 2.68 to 3.87 every 3h22m52s.
L2 Puppis is a noted semi-regular variable with a wide range, from 2.6 to 6.2 about every 141 days. This is a giant reg star 150 light years away. Note that the label carries a sub rather than the normal super..., although some references do not follow the majority in this matter.
Its unrelated neighbour, L1, is an alpha CV variable: 4.86 to 4.93, every 22h.

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