Difference: CometaHolmes2007en (4 vs. 5)

Revision 508 Feb 2011 - SurinyeOlarte

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META TOPICPARENT name="HistoricNoticiesen"

Unexpected appearance of the comet 17P/Holmes

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In the early morning of 24th October, the astronomer Juan Antonio HenrÝquez, in Tenerife, discovered an unexpected increase of luminosity in the comet 17P/Holmes, of magnitude 16.5 only some days before.
Through the night, observers from all over the world followed the event finding that - for their surprise - the sudden increase of brightness not only persisted, but also was more and more evident: Ramon Naves, in Barcelona, caught the comet at magnitude 7.3 and a bit after Seiichi Yoshida, in Japan, measured a magnitude of 2.8.
At about the end of the night in Barcelona, astronomers of the DAM
determined an apparent visual magnitude of 2.9, for a total increase of more than 13 magnitudes!!
Diagrama del lloc on pot observar-se el cometa 17P/Holmes, al bell   mig de la constelĚlaciˇ de Perseu.
Diagram of the place where the comet 17P/Holmes can be observed, at the very middle of Perseus.
Courtesy: Astro Info
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In the early morning of 24th October, the astronomer Juan Antonio HenrÝquez, in Tenerife, discovered an unexpected increase of luminosity in the comet 17P/Holmes, of magnitude 16.5 only some days before.
Through the night, observers from all over the world followed the event finding that - for their surprise - the sudden increase of brightness not only persisted, but also was more and more evident: Ramon Naves, in Barcelona, caught the comet at magnitude 7.3 and a bit after Seiichi Yoshida, in Japan, measured a magnitude of 2.8.
At about the end of the night in Barcelona, astronomers of the DAM
determined an apparent visual magnitude of 2.9, for a total increase of more than 13 magnitudes!!
Diagrama del lloc on pot observar-se el cometa 17P/Holmes, al bell   mig de la constelĚlaciˇ de Perseu.
Diagram of the place where the comet 17P/Holmes can be observed, at the very middle of Perseus.
Courtesy: Astro Info
 


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  As can be seen in the previous diagram, the appearance of the comet 17P/Holmes has taken place at the constellation of Perseus, very close to the stars α Persei (Mirphak or Algenib) and δ Persei. It seems very similar to a star when observed with the naked eye, because it does not show the characteristic tale of comets. On the other hand, when observed with any kind of instrument it looks very different: like a fuzzy yellow-white dot. Fortunately, Perseus is visible through the whole night for the northern hemisphere observers this season.
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Aspecte del cometa 17P/Holmes
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Aspecte del cometa 17P/Holmes
  Appearance of the comet 17P/Holmes. With appropiate instruments it is clearly seen that it is not a star.
Courtesy: Ramon Naves.

This kind of sudden increases of luminosity, called outbursts, are very difficult to predict. So, it is not possible to be sure about how much time things will stay like today. It is an unrepeatable opportunity that you cannot miss!!

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Imatge del cometa 17P/Holmes el 24 d'octubre
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[Imatge del cometa 17P/Holmes el 24 d'octubre
  Appearance of the constellation of Perseus on 24th October.
Courtesy: unknown (check the link on the image)

Predictions, based on the registered behaviour of the comet through its last observed outburst, on November 1892, moment when it was discovered by the english astronomer Edwin Holmes, say that it will maintain its luminosity at least for a week as it grows until reach some arcminutes of diameter.

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Traject˛ria aparent del cometa 17P/Holmes durant les properes  setmanes
Traject˛ria aparent del cometa 17P/Holmes durant les properes setmanes.
Cortesia: Astrosite Groningen
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Traject˛ria aparent del cometa 17P/Holmes durant les properes  setmanes
Traject˛ria aparent del cometa 17P/Holmes durant les properes setmanes.
Cortesia: Astrosite Groningen
 

Additional information:

  1. Sky and Telescope
  2. Information on the web page by Seiichi Yoshida
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  Here you can find the images about the comet 17P/Holmes that we have recived from you:
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Imatge del cometa 17P/Holmes. No disposem de mÚs dades al  respecte.
Courtesy of David Allepuz i SunyÚ, from the observatory of Sant JuliÓ de Vilatorta.
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Imatge del cometa 17P/Holmes. No disposem de mÚs dades al  respecte.
Courtesy of David Allepuz i SunyÚ, from the observatory of Sant JuliÓ de Vilatorta.
 
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ISO.
Exposition of 3 minutes. Manual following.
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ISO.
Exposition of 3 minutes. Manual following.
 
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ISO.
Exposition of 5 minutes. Manual following.
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ISO.
Exposition of 5 minutes. Manual following.
 
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ASA.
Exposition of 10 minutes. Electronic following.
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Imatge del cometa 17P/Holmes obtinguda des d'Hortoneda
Courtesy of └lex Roca, Hortoneda (Pallars JussÓ).
Image obtained with a camera Konica with objective of 135 mm and focal length of 3.5 on a film Fuji 200 ASA.
Exposition of 10 minutes. Electronic following.
 
META TOPICMOVED by="DaniMolina" date="1290443625" from="ServiAstro.CometaHolmes2007En" to="ServiAstro.CometaHolmes2007en"
 
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