Image of the day

Captured by
Ron Masters

Saturn Dione Tethys 28 August 2021

My Account

New to Astromart?

Register an account...

Need Help?

Exoplanet transit HD209458b in Pegasus

Started by ayiomamitis, 09/03/2008 05:31AM
Posted 09/03/2008 05:31AM Opening Post
Dear group,

I used the opportunity last night to pursue the transit of exoplanet HD 209458b in Pegasus.

This exoplanet is particularly interesting since it is the first discovery using the transit method - its initial discovery in the 1990's was via the radial method - and it has been confirmed to have water in its atmosphere (similar to the exoplanet HD 189733b in Vulpecula - http://www.perseus.gr/Astro-Photometry-HD189733-20080627.htm ).

Photometry for this exoplanet was somewhat challenging since the best comparison star within my 25'x35' field of view was nearly one magnitude dimmer and of a different spectral type. To add insult to injury, the comparison star is dimmer by yet another one magnitude.

Also, seeing last night was uncharacteristically quite poor but I am quite happy with the light curve which ensued. For a result based on 4.5 hours, I kindly direct you to http://www.perseus.gr/Astro-Photometry-HD209458-20080902.htm .

Anthony.