Welcome to the ARO!

The Abbey Ridge Observatory is a robotic astronomical observatory located in Stillwater Lake, NS, Canada. It is owned by Dave Lane.


It is one of only two observatories in the world, along with the Burke-Gaffney Observatory, that can be controlled from Twitter in a fully-automatic way!


At this site, you will find information about the observatory, its work and how to use it.


Abbey Ridge Observatory (ARO), built in 2003, is named for the granite ridge that rises up above Elbow Lake and along Abbey Road in Stillwater Lake, NS. It sits on bedrock on the edge of this ridge giving spectacular views from the south through to northwest. The site is quite dark, considering that it is only about 23 kilometres to the west of Halifax (population ~400,000).

Equipment Summary

The observatory is built around a fiberglass 10-foot diameter Home-Dome. Inside is a Celestron C14 Schmidt-Cassegrain Telescope mounted on a Losmandy Titan german equatorial mount controlled by a SiTech controller. Its imaging camera is an SBIG ST8XME CCD camera with a 10-slot filter wheel, Optec NextGen telecompressor, and an Optic TCF electric focuser. We also use an AAG CloudWatcher to monitor the sky conditions. There are more details here.

2017 News

January 14: Last week it was at magnitude 16.5, then a few days ago, it flared up by about 40 times its normal brightness (the nova part) to magnitude 12.5, which it does every year or two.

If that isn't enough excitement, either the mass depositing or receiving star eclipses the other as it orbits every ~100 minutes and this causes a short drop in brightness for about 10 minutes.


2016 News

December 3, 2016: An amazing new robotic telescope feature goes live today! Images of non-special observations are now tweeted and/or emailed immediately after they are taken! The completed queue is still updated in the morning with the raw data.

November 25, 2016: Four new robotic telescope features go live today: three new commands (#domecam, #satellite, and #send) and an improvement to the #weather command. These features mark the first use of in-line images being added with Tweets.

November 14, 2016: Last night I observed (among other things) variable star FO Aqr simultaneously with the x-ray satellite XMM-Newton. The light curve is below which shows time on the horizontal axis (about 3.5 hours) and the star brightness on the vertical axis. It was varying about 0.5 magnitude over a period of about 23 minutes.

October 16, 2016: Two new features go live today - the 'focus' and 'offset' parameters of the #request command.

The 'focus' parameter is intended to be used defocus the telescope when performing photometry of bright stars to reduce overexposure OR to increase photometric precision by blurring stars over more pixels - this can reduce errors caused by how light falls and is recorded by each pixel.

The 'offset' parameter offsets the telescope's position from its catalog position which could be used, for example, to:

  • build larger images using a mosaic of separate fields,
  • offset a comet's nucleus to a corner of the field so more of the tail can be recorded,
  • and place a variable star off-centre so that reference/check stars are in the field of view.

September 30, 2016: A new feature goes live today  - the 'epoch' parameter of the #request command. From the documentation:

This advanced parameter is used to precisely constrain when an observation request will start. It is intended to be used to observe during an "interesting" time of a periodically changing object, for example, the eclipse part of an eclipsing binary star's orbit or the transit of an extra-solar planet. It can also be used to constrain the time of night that an observation takes place.

September 29, 2016: This is a couple of months old, but... check out this special issue of Nova Notes (the newsletter of the Halifax RASC) that features 5 articles about using our Twitter-telescope!

September 22, 2016: Here is an interesting "science" observation taken last night of the star LS Peg (a cataclysmic variable) which ARO observed for 5 hours followed by Newcastle Observatory (Ontario - Michael Cook) and then Tim Crawford (Texas). It shows rapid fluctuations (minute time scale) and a slow ~4 hour cycle which coincides with its rotation period. The power of collaboration!

Click me for larger version

September 20, 2016: The ARO robot can now be conversed with using Twitter direct messages. You can also now request time series observations and #edit your queued requests!

September 9, 2016: ARO's programs have been updated to BGOs. That means it can be operated now by Twitter DM's too.

May 1, 2016: ARO is now officially online as the world's second Twitter-controlled observatory! I welcome RASC members (and others that I know) to give it a try! It operates identically to the BGO. There are some differences in the available filters and image field of view.

April 30, 2016: A new website is done!

January, 2016: ARO is now the world's second Twitter-operated observatory after the BGO. Documentation on how to use the observatory yourself will be put on-line soon!

Go to top