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A spectacular lunar graze

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Presentation on theme: "A spectacular lunar graze"— Presentation transcript:

1 A spectacular lunar graze
2015 Nov 17 Dave Herald

2 Lunar grazes have multiple events as the star skims along the lunar limb
When grazes were commonly observed, it was not possible to accurately predict where a large number of events could be observed This has changed with the advent of data from the Kaguya, and subsequently the LRO LOLA missions 28/11/2018

3 Lunar graze profile Occult can now generate lunar limb graze profiles having very detailed resolution Enables the observer to position themselves to observe large number of events Enhanced opportunities to measure stellar diameter, or double star properties 28/11/2018

4 Profile changes with longitude
The graze profile varies along the path To maximise the number of events, consider selecting the site longitude The example shows the changes at steps of 0.5° (about 30 miles) along the path GrazeProfile 635cG Feb 16.gif 28/11/2018

5 Graze on 2015 Nov 17 On 2015 Nov 17, a good graze occurred close to my home. David & Joan Dunham had recently arrived in Canberra from Alice Springs – but had not yet unpacked…. On the night, over a distance of 272 meters: Joan was set up in time, but could only record the first half because of increasing cirrus David was unable to set up in time I observed through thin but increasing cirrus

6 Predicted path

7 Graze profile, with Dunham’s home site indicated
Found an observing location to maximise the number of events – at about 4.7km in

8 Video of the event The video of the graze is on YouTube. Address is
28/11/2018

9 Results Mean residual of events: 0.01" ±0.03"
Telescopes: Aperture Longitude Latitude Alt # cm o ' " o ' " m A B ref Tel Observer Star No. y m d h m s PhGrMrCeDb O-C 001 A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G A D. Herald S RD G G A D. Herald S DD G G 026 A D. Herald S RD G G 027 A D. Herald S DD G G 028 A D. Herald S RD G G 029 A D. Herald S DD G G 030 A D. Herald S RD G G 031 A D. Herald S DD G G 032 A D. Herald S RD G G 033 A D. Herald S DD G G 034 A D. Herald S RD G G 035 A D. Herald S DD G G 036 A D. Herald S RD G G 037 A D. Herald S DD G G 038 A D. Herald S RD G G 039 A D. Herald S BD G G 040 A D. Herald S DD G G 041 A D. Herald S RD G G 042 A D. Herald S DD G G 043 A D. Herald S RD G G 044 A D. Herald S DD G G 045 A D. Herald S RD G G 046 A D. Herald S DD G G 047 A D. Herald S RD G G 048 A D. Herald S DD G G 049 A D. Herald S RD G G 050 B J. Dunham S DD G G 051 B J. Dunham S RD G G 052 B J. Dunham S DD G G 053 B J. Dunham S RD G G B J. Dunham S RD G G Mean residual of events: 0.01" ±0.03"

10 Reduction plot 49 events detected at one site – a record
Plot also shows path for Joan Dunham – located just 272 metres south 28/11/2018

11 Enlarged profile plots

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