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© Croydon Astronomical Society 2012 Croydon, Surrey, England. Charity Registered in England and Wales No. 251560


Croydon Astronomical Society
est. 1956

Astronomical Observing with the Croydon Astronomical Society

Members of the CAS carry out observations at both The Croydon Astronomical Society Observatory at Kenley as well as a wide range of locations both near Light Polluted Croydon, other parts of the UK and abroad.

In addition to visual observing members record their observations on a variety of instruments including film cameras, CCDs, Standard Digital Cameras and Video.

Observing Projects

The following are some ideas for events and objects to observe. The lists also contains both short term and longer projects that may be of interest to members and others. If you take part in these projects let us know via our forum croydonastro. Your results may be presented at our Annual Exhibition Meeting.

New projects or events will be added to the top of this list and some will be archived after the event.




Asteroid 10381 Malinsmith

Image the asteroid 10381 Malinsmith

Konrad Malin-Smith, a life member and past chairman of the Croydon Astronomical Society, has an asteroid (minor planet) named after him, 10381 Malinsmith. It was discovered on 3rd September 1996 by Brian G.W. Manning at Stakenbridge.

The challenge is for members to acquire at least two image of the asteroid.

More details are on this page 10381 Malinsmith, which also generates an ephemeris (table giving the position of this asteroid in the sky at the current time) to allow you to point your telescope in the right direction to image it. In addition it shows a very nice animated diagram of its position in relation to the solar system.


Venus Express Ground Observing Project

The Venus Express Ground Observing Project (VEXGOP) is an opportunity to contribute scientifically useful images and data to compliment the Venus Express (VEX) spacecraft observations of Venus. The project will focus on utilising the capabilities of advanced amateurs to obtain images of the atmosphere of Venus; specifically filtered monochrome images obtained with CCD based cameras in the 350nm to 1000nm (near ultraviolet, visible and near infrared range).

The Venus Express (VEX) spacecraft will observe the planet Venus using seven instruments for at least two Venusian years (1000 days) beginning in May 2006. The instrument package includes the Venus Imaging Camera (VMC), which will image the planet in the near-UV, visible and near-IR range. Although VMC will provide much higher resolution images of the planet than visible from Earth, continuous monitoring of the planet will not be possible.

There may be periods, therefore, when parts of the planet are visible from Earth that are not visible from the spacecraft (due to the spacecraft position in orbit). Additionally it is important to compare Earth-based observations with simultaneous spacecraft observations. In particular this will allow us to extend our understanding of the dynamics of Venus’s atmosphere based on the VEX data to observations made prior to the VEX mission, as well as after completion of VEX operations. Objectives

The objectives of VEXGOP is to obtain high quality images of Venus before, after and during VEX operations. Amateur astronomers, using CCD based cameras with filters for specific band passes in the near ultra-violet, visible and near infrared wavelengths (350nm to 1000nm), are encouraged to participate in the gathering of images. Observation campaigns will include:

    * Routine images of Venus during each apparition

    * Coordinated observations during specific periods of the VEX mission to provide either simultaneous or complimentary ground based images to VEX spacecraft observations

For more details go to:


May 2006

to at least


More details of our observatory can be found here.

Members images are shown on a separate page which can be accessed via this link.

To enable you to plan your observing sessions this site shows the twilight times for London.

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