Interesting photo...

Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long exposure and
a narrow aperture. My location at the time was about 27 N and 15 W (Canary
Islands). When I looked at the photo I saw an interesting object above the
moon and slightly to the right. Can someone with astronomy planetarium
software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

--
Boo

If that is 00:30 hrs on 7 July it is Jupiter.
"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long exposure
and
a narrow aperture. My location at the time was about 27 N and 15 W
(Canary
Islands). When I looked at the photo I saw an interesting object above
the
moon and slightly to the right. Can someone with astronomy planetarium
software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

--
Boo

"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long exposure
and
a narrow aperture. My location at the time was about 27 N and 15 W
(Canary
Islands). When I looked at the photo I saw an interesting object above
the
moon and slightly to the right. Can someone with astronomy planetarium
software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

About three times the distance above as it was to the right. It was brighter
than any other object, apart from the moon. Certainly looks like Jupiter,
just didn't think I could pick out that much detail with only a Canon A80.
Oh, and I meant wide aperture in my first post.

http://www.geocities.com/marcusfox/IMG_1564.JPG

Marcus

Marcus Fox wrote:
"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long exposure
and
a narrow aperture. My location at the time was about 27 N and 15 W
(Canary
Islands). When I looked at the photo I saw an interesting object above
the
moon and slightly to the right. Can someone with astronomy planetarium
software check what it is?
Jupiter ? What did it look like ? How far above and to the right ?

About three times the distance above as it was to the right. It was brighter
than any other object, apart from the moon. Certainly looks like Jupiter,
just didn't think I could pick out that much detail with only a Canon A80.
Oh, and I meant wide aperture in my first post.

http://www.geocities.com/marcusfox/IMG_1564.JPG


Yep, that would be Jupiter. I used Stellarium http://www.stellarium.org/ to
check that out, if you're interested.

--
Boo

Am Tue, 15 Aug 2006 12:00:10 GMT schrieb Marcus Fox:

"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long exposure
and
a narrow aperture. My location at the time was about 27 N and 15 W
(Canary
Islands). When I looked at the photo I saw an interesting object above
the
moon and slightly to the right. Can someone with astronomy planetarium
software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

About three times the distance above as it was to the right. It was brighter
than any other object, apart from the moon. Certainly looks like Jupiter,
just didn't think I could pick out that much detail with only a Canon A80.
Oh, and I meant wide aperture in my first post.

http://www.geocities.com/marcusfox/IMG_1564.JPG

Marcus

Huh,
That seems to be a reflection at the lenses in your camera. Its definetly
not an astronomical object, its too big for that.

Gruß aus Hanover/Germany

Michael Weber wrote:
Am Tue, 15 Aug 2006 12:00:10 GMT schrieb Marcus Fox:

"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long
exposure and a narrow aperture. My location at the time was about 27
N and 15 W (Canary Islands). When I looked at the photo I saw an
interesting object above the moon and slightly to the right. Can
someone with astronomy planetarium software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

About three times the distance above as it was to the right. It was
brighter than any other object, apart from the moon. Certainly looks
like Jupiter, just didn't think I could pick out that much detail with
only a Canon A80. Oh, and I meant wide aperture in my first post.

http://www.geocities.com/marcusfox/IMG_1564.JPG

Marcus

Huh,
That seems to be a reflection at the lenses in your camera. Its
definetly not an astronomical object, its too big for that.

Nope, it is Jupiter, the band across the middle is at the correct angle.
Just a pity that the Jovian moons don't show. Callisto is close by at
the left hand side of the band.


--
Graham W http://www.gcw.org.uk/ PGM-FI page updated, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps
Change 'news' to 'sewn' in my Reply address to avoid my spam filter.

Nope, it is Jupiter, the band across the middle is at the correct angle.
Just a pity that the Jovian moons don't show. Callisto is close by at
the left hand side of the band.



I think you are mistaken here...

If you measure the image posted (ignoring any saturation of the pixels) the
estimated pixel-diameter proportion of the two images are in the region of
74:12, which would mean that what is being taken as an image of Jupiter's
disc subtends far too large an angle. Given the Moon subtends 30arcmins, at
this same scale the disc of Jupiter would subtend ~290arcsecs, or 6.5x too
large.

Then note the camera used, its a Canon A80 (which I have). At full zoom
(23.4mm) and full resolution, the image scale works out as 27.3arcsecs/px.
The disc of the full Moon at that image scale subtends ~66 pixels, and
Jupiter at 45arcsecs a mere two pixels! Yes you can image at least one of
the Galilean satellites with the A80 at full zoom (and I have done so), but
no way will you image the true disc of the planet at that focal length.

This is not to say the image is not an image of Jupiter, it may well be.
But if it is, it is not an image of the true disc of the planet imaged with
the A80 without additionally coupling it afocally to a telescope.

Dave Randell

David Randell wrote:
Nope, it is Jupiter, the band across the middle is at the correct
angle. Just a pity that the Jovian moons don't show. Callisto is close
by at the left hand side of the band.



I think you are mistaken here...

If you measure the image posted (ignoring any saturation of the pixels)
the estimated pixel-diameter proportion of the two images are in the
region of 74:12, which would mean that what is being taken as an image
of Jupiter's disc subtends far too large an angle. Given the Moon
subtends 30arcmins, at this same scale the disc of Jupiter would
subtend ~290arcsecs, or 6.5x too large.

Then note the camera used, its a Canon A80 (which I have). At full zoom
(23.4mm) and full resolution, the image scale works out as
27.3arcsecs/px. The disc of the full Moon at that image scale subtends
~66 pixels, and Jupiter at 45arcsecs a mere two pixels! Yes you can
image at least one of the Galilean satellites with the A80 at full zoom
(and I have done so), but no way will you image the true disc of the
planet at that focal length.

All of which is true if the image was critically focussed. But it is
really
out of focus. Have a look at the wires and their bits of binding twine
and the shrubbs at the right.

This is not to say the image is not an image of Jupiter, it may well be.
But if it is, it is not an image of the true disc of the planet imaged
with the A80 without additionally coupling it afocally to a telescope.

Agreed. But it is Jupiter and (suprise) at the very top, left of the Moon
is Zubenelgenubi (mag 2.75) just showing.

Did you set your planetarium to the photographer's given co-ords to
check? Some of the info is a bit sketchy, like the time and TZ but the
correspondance is striking (like it should be!).


--
Graham W http://www.gcw.org.uk/ PGM-FI page updated, Graphics Tutorial
WIMBORNE http://www.wessex-astro.org.uk/ Wessex Astro Society's Website
Dorset UK Info, Meeting Dates, Sites & Maps
Change 'news' to 'sewn' in my Reply address to avoid my spam filter.

Nope, it is Jupiter, the band across the middle is at the correct
angle. Just a pity that the Jovian moons don't show. Callisto is close
by at the left hand side of the band.

I think you are mistaken here...

To clarify: by that I meant I think you are mistaken to think that that
image is an image of the *disc* of the planet; For why else mention the
"band across the middle" and it being a pity one of the Galillean satellites
are not visible?

[discussion follows]

All of which is true if the image was critically focussed. But it is
really
out of focus.

Then to reiterate my point above, why mention the banding as evidence that
it is Jupiter, which on a normal reading one takes to mean its a feature of
the planet's disc, and of not seeing one of the Moon's that would imply its
in focus? If by that banding, you now do not mean banding from the image in
focus, what else are we meant to imply from that?

Have a look at the wires and their bits of binding twine
and the shrubbs at the right.

Yes I saw the wires, and the plants, in the bottom right too, but seeing the
wires does not necessarily mean the image is out of focus: the lens on that
camera is 7.8mm-23.4mm so the realtively speaking large depth of focus may
be a factor here too. And more so if a small aperture was used.

This is not to say the image is not an image of Jupiter, it may well be.
But if it is, it is not an image of the true disc of the planet imaged
with the A80 without additionally coupling it afocally to a telescope.

Agreed. But it is Jupiter and (suprise) at the very top, left of the Moon
is Zubenelgenubi (mag 2.75) just showing.

Did you set your planetarium to the photographer's given co-ords to
check? Some of the info is a bit sketchy, like the time and TZ but the
correspondance is striking (like it should be!).

No I never checked any of this: I was working from the image alone and what
I know about that camera and what you can and cannot image with it. The
bottom line in all this is simply that your reply to the original poster
implied the image was an image of the planet's disc complete with its
characteristic banding, that's all.

Regards,
Dave R

Am Thu, 17 Aug 2006 15:16:28 +0100 schrieb Graham W:

Michael Weber wrote:
Am Tue, 15 Aug 2006 12:00:10 GMT schrieb Marcus Fox:

"Boo" wrote in message
.. .
Marcus Fox wrote:
On 6th July around 12:30, I took a photo of the moon, on a long
exposure and a narrow aperture. My location at the time was about 27
N and 15 W (Canary Islands). When I looked at the photo I saw an
interesting object above the moon and slightly to the right. Can
someone with astronomy planetarium software check what it is?

Jupiter ? What did it look like ? How far above and to the right ?

About three times the distance above as it was to the right. It was
brighter than any other object, apart from the moon. Certainly looks
like Jupiter, just didn't think I could pick out that much detail with
only a Canon A80. Oh, and I meant wide aperture in my first post.

http://www.geocities.com/marcusfox/IMG_1564.JPG

Marcus

Huh,
That seems to be a reflection at the lenses in your camera. Its
definetly not an astronomical object, its too big for that.

Nope, it is Jupiter,

Huh, at this size and Brightness?

the band across the middle is at the correct angle.
Just a pity that the Jovian moons don't show. Callisto is close by at
the left hand side of the band.

plz. correct me, but Jovian Moons??? - U R just joking?


Gruß aus Hanover/Germany