John, Tom, I recorded an ISS solar transit a couple of weeks ago near sunset when the sun was just 7 degrees above the horizon. The video was, indeed, poor, but I manage to record about 18 frames of ISS. You can read my write up of the event and view my 2MB animated .gif of the transit at: http://users.erols.com/robisch/may22solar.html Field of view in the video was about 8.25' x 6.2'. All I can say is high magnification does not mix well with such a low altitude! -Ron Robisch Monrovia, MD From: "John Locker" <john@satcom.freeserve.co.uk> Date: Fri, 4 Jun 2004 18:24:49 +0100 To: <SeeSat-L@satobs.org> Subject: Re: accuracy of ISS / Venus transit track Resent-From: SeeSat-L@satobs.org Resent-Date: Fri, 4 Jun 2004 13:25:10 -0400 The lowest elevation pass I have on file Tom is that of Aug 29 2003 ( had forgotten about it ) The sun was at 15 degs , and ISS had an angular diameter of just 4.1" at a range of 1125km I'd be surprised if you could get any useable results below that elevation as you would need a near full disk image , and the station would be almost invisible. A smaller FOV could obviously be used , but then that would defeat the object as only a tiny portion of the solar disk would be in frame. John. > > I hope someday to capture a transit of the ISS across a rising/setting Sun or > Moon- though at that distance & seeing, the ISS is likely only to be a small, > indistinct blob- otherwise, the effect of atmospheric ray-bending is just a > small technical point ;-) > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Fri Jun 04 2004 - 14:09:48 EDT