Complete ephemerides for Eris (formally called either Xena or 2003 UB313) are now available through the links below.
In fact, four different ephemerides are available for Eris using the standard astrological tropical zodiac. Pick the one which has the information you require. Retrogrades and stations are not indicated in any of these ephemerides. Nonetheless for three of them you will be able to identify and note them yourself with careful observation, but for the other ephemeris (Option Three below), retrogrades cannot be seen.
Note: A big thank you to Juan Antonio Revilla for his Riyal calculation software from which these ephemerides were derived. I have extensively reformatted the output for quick usage by the working astrologer. The Riyal software calculates Eris's planetary position to the arc second, which in my view is a bit optimistic in terms of accuracy, but I have included the calculation anyway. Decide for yourself whether or not to use arc seconds. IMHO, the accuracy would be closer to an arc minute or two, which is still pretty remarkable.
The quick Eris ephemeris. Covers the years 1900-2103 in ten-day intervals. Must have for serious students of astrology or those wanting to locate Eris quickly in their natal chart. This is still the handiest ephemeris for a quick reference. Click here for the ASCII version, which you can click to save to your hard drive, open in your Windows notebook, and send to your word processor, etc.
Eris daily ephemeris for 1800 - 2103. This ephemeris is available for free download as a 500 KB zip file. Use WinZip or an equivalent utility to unzip this file on your hard drive. It expands into three ascii files of about 900 KB per file which can be opened in your Windows notebook, MS word, or whichever other word processing software you choose. One file for each century. Designed for those who need a daily Eris position in the modern world. Retrogrades and stations are easily discernable. Click here to download.
The annual (366-day) Eris ephemeris. Gives the planetary position once a year every year from 602 C.E. to 2103 C.E. Ideal for those wanting a quick historical overview of Eris over a 1,500-year period of time. Retrogrades and stations are not indicated. Click here to view, then download the file from your browser to your hard drive.
If the annual ephemeris in Option Three above does not have the detail you require, try the large 10-day Eris ephemeris which covers the same 602 C.E. to 2103 C.E. time period in detail. This ephemeris is available for free download as a 280 KB zip file. Use WinZip or an equivalent utility to unzip this file on your hard drive. It expands to a 1.3 MB ascii file which can be opened in your Windows notebook, MS word, or whichever other word processing software you choose. Designed for the serious astrological researcher or the exceptionally curious. Retrogrades and stations are discernable in this ephemeris.Click here to download.
Can't make up your mind? Then try this one big zip file, which contains all of the Eris ephemerides mentioned above. For those of you on dialup, it's 850 KB to download, but much bigger unzipped. Click here to download.