To view photos of the event on Mount Wilson please click here

To view a diagram of the transit path please click here

To view a 1250 x 1250 image of 1st Contact please click here

To view a full resolution image of 1st Contact please click here

To view a 1250 x 1250 image of 2nd Contact please click here

To view a full resolution image of 2nd Contact please click here

To view a 1250 x 1250 image prior to greatest transit please click here

 

 

The Details
Object
Transit of Venus
Optics
Astro-Physics 160 EDF Refractor at f/7.7
Platform
Astro-Physics 1200 GTO Mount
Camera
SBIG STL-11000M
Filters
Baader Herschel Wedge
Date
05 June 2012
Location
Mount Wilson Observatory, Mount Wilson, CA
Exposure
Open filter slot 0.004 second, 1x1 binned
Software
Maxim DL/CCD, CCDStack 2, Photoshop CS5
Notes
The first observed transit of Venus was made by Jeremiah Horricks on December 6, 1639.  From the tiny village of Much Hoole near Liverpool, England, Horricks used a small telescope to project a 6” diameter image of the Sun on white paper and noted:

“I then beheld a most agreeable spectacle, the object of my sanguine wishes, a spot of unusual magnitude and of a perfectly circular shape, which had already fully entered upon the Sun’s disk on the left, so that the limb of the Sun and Venus were precisely coincided, forming an angle of contact.  Not doubting that this was really the shadow of the planet, I immediately applied myself sedulously to observe it.”

Transits of Venus are very rare astronomical events, with the next one not occurring until 11 December 2117.  Since the invention of the telescope, transits of Venus have occurred in 1631 (unobserved), 1639, 1761, 1769, 1874, 1882, 2004 and 2012. 

Details for the 05 June 2012 transit at the Mount Wilson Observatory as follows:

External Ingress (1st Contact)      - 3:06:17 PM       Sun Altitude 58°
Internal Ingress (2nd Contact)      - 3:23:53 PM       Sun Altitude 55°
Greatest Transit                               - 6:23:53 PM       Sun Altitude 18°

The sun set at 8:01 PM at an azimuth of 293° from Mount Wilson with the transit in progress.  3rd and 4th contacts were not visible.

North is Up and East is 90° CW from North in the above images

 

 

 

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