M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation. (David Chiron)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 109 · NGC 3992 · Phecda (γUMa) · The star Phad

M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation., David Chiron

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M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation.

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M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation.

M109 ,et l'étoile Phecda de la Grande Ourse.

Observée pour la première fois par Pierre Méchain le 12 mars 1781, M109 est une galaxie spirale barrée (classée SBc) comparable en taille à notre galaxie. On estime sa distance à 55 millions d'AL. Une supernova appelée SN 1956A est apparue dans M109 le 17 mars 1956, et atteignit une magnitude apparente de +12,6 à son apogée.

L'étoile γ (UMa) nommée Phecda est une étoile de magnitude 2.41. Elle porte également les noms traditionnels Phecda, Phekda ou Phad. C'est une étoile bleue d'indice de couleur 0,00. Elle est situé beaucoup plus prêt de nous que l'est M109, 84 AL exactement.

Observed for the first time by Pierre Méchain March 12, 1781, M109 is a barred spiral galaxy (ranked SBc) comparable in size to our galaxy. Estimated its distance at 55 million LY. A supernova called SN 1956a appeared in M109 March 17, 1956, and reached an apparent magnitude of 12.6 at its peak.

The star γ (UMa) named Phecda is a star of magnitude 2.41. It has the traditional names Phecda, Phekda or Phad. It's blue star color index 0.00. It is located much loan that is the M109, 84 AL exactly.

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M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation.

M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation.

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M109 et l'étoile Phecda de la Grande Ourse. M109 and Phecda star in Grande Ourse constellation.

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