by alter-ego » Fri Sep 03, 2010 6:54 am
alter-ego wrote:neufer wrote:This would make the likely star candidate Zubenelgenubi in Libra.
Bingo, α Librae.
I was premature with this call. Nothing made sense when I tried to identify more stars, but I think I have now located the picture. It's in exactly the same location -- I made the wrong assumption about the APOD picture orientation (maybe most of us did). In the simulator, I zoomed in to the Earth (0.5º FOV) was surprised to find the Moon
on the left side of the Earth not the right. The orbs are on the same axis, just reversed left to right! In fact it turns out the picture is clocked 180º from the simulator view (with a little added rotation). It's amazing how perspective can affect understanding.
![wspace_moon2.jpg (24.66 KiB) Viewed 12554 times Simultor view, 0.5º FOV<br />6 May 2010 0700 UTC<br />Earth - Moon axis marked](./download/file.php?id=1010&t=1&sid=6b9cfb43fcb66904d1307cb7b03fa7c8)
- Simultor view, 0.5º FOV
6 May 2010 0700 UTC
Earth - Moon axis marked
Below is a 20º FOV simulator view with the Earth - Moon, and the clocked APOD. The dotted lines show the Earth - Moon axis, and I've circled many stars that are common to both pictures. The particular star in question earlier is
δ Scorpii, and the obvious pair of stars is
ω1,2 Scorpii. I believe they are the same fields by virtue of how many common stars there are. I cannot find all the stars, but one field is a picture and the other is a simulation, so I'm happy and convinced they are the same.
![Messenger View - Stars Circled.JPG (55.67 KiB) Viewed 12554 times Simulator view, 20º FOV<br />6 May 2010 0700 UTC<br />Earth - Moon axis transferred](./download/file.php?id=1014&t=1&sid=6b9cfb43fcb66904d1307cb7b03fa7c8)
- Simulator view, 20º FOV
6 May 2010 0700 UTC
Earth - Moon axis transferred
![APOD - Messenger View, Stars Circled.JPG (61.9 KiB) Viewed 12554 times APOD Clocked 180º - Messenger view of Earth/Moon, 10.5º FOV<br />6 May 2010 0700 UTC<br />Earth - Moon axis shown](./download/file.php?id=1015&t=1&sid=6b9cfb43fcb66904d1307cb7b03fa7c8)
- APOD Clocked 180º - Messenger view of Earth/Moon, 10.5º FOV
6 May 2010 0700 UTC
Earth - Moon axis shown
That simulation works well - I wish we could enter a coordinate.
Bingo!
[quote="alter-ego"][quote="neufer"]This would make the likely star candidate [color=#0000FF][size=150]Zubenelgenubi in Libra[/size][/color].[/quote]
Bingo, α Librae.[/quote]
I was premature with this call. Nothing made sense when I tried to identify more stars, but I think I have now located the picture. It's in exactly the same location -- I made the wrong assumption about the APOD picture orientation (maybe most of us did). In the simulator, I zoomed in to the Earth (0.5º FOV) was surprised to find the Moon [u]on the left side of the Earth[/u] not the right. The orbs are on the same axis, just reversed left to right! In fact it turns out the picture is clocked 180º from the simulator view (with a little added rotation). It's amazing how perspective can affect understanding. [attachment=2]wspace_moon2.jpg[/attachment] Below is a 20º FOV simulator view with the Earth - Moon, and the clocked APOD. The dotted lines show the Earth - Moon axis, and I've circled many stars that are common to both pictures. The particular star in question earlier is [color=#0000FF]δ Scorpii[/color], and the obvious pair of stars is [color=#0000FF]ω1,2 Scorpii[/color]. I believe they are the same fields by virtue of how many common stars there are. I cannot find all the stars, but one field is a picture and the other is a simulation, so I'm happy and convinced they are the same.
[attachment=1]Messenger View - Stars Circled.JPG[/attachment]
[attachment=0]APOD - Messenger View, Stars Circled.JPG[/attachment]
That simulation works well - I wish we could enter a coordinate.
[size=85]Bingo![/size]