A Three Positive chords were recorded using video OSD technique and one by Visual observation.
One clearly observed miss was recorded for this event.
View the updated prediction.
Observers: 1 P ANDERSON, Gap, Brisbane, QLD,AU (visual) 2 J Bradshaw,Samford Valley, Qld, AU 3 J Broughton,Reedy Creek, QLD, AU 4(M) J Broughton,Brunswick Heads, NSW, AU 5(P) Prediction, April 12
The ellipse above is plotted at the best fit axis ratio as determined by Occult. The size at about 187 km is much larger then the predicted 202 km circle. With 3 chords we can be confident of the path of Elpis and that it was close to the predicted line. Sadly there is no Damit/ISAM/Miriade 3D model that might help to explain the size variation.
The figure below shows Jonathan Bradshaw's Tangra light curve of the occultation.
Observation details for MP ( 59 ) Elpis By Star HIP HIP42383 On 2014-04-24 at 11:04:10.0 _______________________________ Observer Peter ANDERSON Location The Gap, Brisbane, Queensland Longitude +152:55 Latitude -27:27 Altitude 171 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 28 cm Seeing Steady Broken cloud Camera Type Visual Other Camera Delay 0.5 Timing Stopwatch Visual, PE applied Disappearance 11:04:04.10 Reappearance 11:04:16.70 Comments: A disaster. Early cloud meant setup rushed, so I monitored two stars. Static and no radio time signal till 25 minutes later to check disappearance stopwatch for time adjustment. Mistriggered re-appearance stopwatch, but I had called both out and had the beeper box (unsynchronised) running to keep the tape 'honest'. Bit of a mess really. Still the event was 12.6 seconds probably +/- 0.5 seconds. If the times do not agree with other observers, please 'block shift' - Very sorry. [ As it happens Peter's time are very close to Jonathan Bradshaw's nearby Video times below, so well done Peter despite the problems - jt] _______________________________ Observer Jonathan Bradshaw Location Samford Valley, Qld, Australia Longitude +152:50 Latitude -27:22 Altitude 80 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 36 cm Seeing Steady Clear Camera Type G-Star PAL/CCIR Camera Delay -0.04 Timing GPS - time inserted Video with frame analysis Disappearance 11:04:03.64 Reappearance 11:04:16.54 Comments: Text book bright event showing field accuracy timings _______________________________ Observer John Broughton Location Reedy Creek, QLD, AU Longitude +153:23 Latitude -28:06 Altitude 66 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 25 cm Seeing Steady Thick cloud > 2 Camera Type WAT120N+ PAL/CCIR Camera Delay -0.05 Timing GPS - time inserted Video with frame analysis Disappearance 11:04:07.63 Reappearance 11:04:14.71 Comments: _______________________________ Observer John Broughton Location Brunswick Heads, NSW, AU Longitude +153:32 Latitude -28:33 Altitude 5 m Datum WGS84 Telescope Newtonian Aperture 32 cm Seeing Steady Thick cloud > 2 Camera Type WAT120N+ PAL/CCIR Camera Delay -0.05 Timing GPS - time inserted Video with frame analysis Missed Comments: