Posted 11 September 2013 - 04:32 PM
Thanks for any help.
Posted 11 September 2013 - 08:16 PM
It's been closing more rapidly in recent years - Hipparcos measured 2.2" in 1991, so it was nice'n'easy then. Given the rate of change, increasing, it could become quite difficult a few decades from now. And the period is likely very long, so it may stay tight for a quite long time through periastron and beyond, before again becoming of easy separation.
Posted 11 September 2013 - 11:01 PM
Here's a link to the data: WDS Sixth Orbit Catalog - Ephemerides.
Scroll down to 22266-1645,which is about 90% of the way down the page.
Those are the same figures shown on the Stelledoppie page, which shows the plotted orbit as a grade 4, so I suppose you could call the figures semi-reliable.
I agree with Fred -- not a lot of data, so it does seem a bit on the optimistic side. I noticed that the Ephemerides plot for 2012 doesn't match the actual 1.5" measurement listed in the WDS for that year. Something doesn't quite add up between those two figures, but given that the pair has been closing, it's certainly less than 1.5".
Edit: I just realized Pi Aquilae is at 1.4" right now and is also similar in magnitude (6.34 and 6.75 vs. 6.29 and 6.39 for the AB pair of 53 Aqr). Should be interesting to compare the two to see if it's possible to detect any difference in separation.
Posted 12 September 2013 - 08:09 PM