Venus times etc.

My times for Venus transit, from Walmer, Kent, UK, 51d 12m 00s N : 1d
24m 20s E.
250mm F6, 21mm zoom EP, 100mm dia Baader filter.

1st contact; 06-20-47 (BST, H-M-S,+/- 3s)
2nd ; 06-39-15
3rd ; 12-03-51
4th ; 12-23-35


I noticed a bright rim to the planet as it was aprox 7/8 onto the
solar disc at both ingress and egress.
An optical illusion or an atmospheric effect ?
John Carruthers


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1st: 06:21:08
2nd: 06:39:12
3rd: 12:04:30
4th: 12:22:28

Bristol, UK

Tony

"John Carruthers" wrote in message
...
My times for Venus transit, from Walmer, Kent, UK, 51d 12m 00s N : 1d
24m 20s E.
250mm F6, 21mm zoom EP, 100mm dia Baader filter.

1st contact; 06-20-47 (BST, H-M-S,+/- 3s)
2nd ; 06-39-15
3rd ; 12-03-51
4th ; 12-23-35


I noticed a bright rim to the planet as it was aprox 7/8 onto the
solar disc at both ingress and egress.
An optical illusion or an atmospheric effect ?
John Carruthers


--
http://mysite.wanadoo-members.co.uk/jc_atm/



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I missed the first two, due to cloud

Was too busy photographing, and forgot the third contact.
But...

4th 12:22:58 in West Yorkshire.

Colin.

"Tony Pottrell" wrote in message
news
1st: 06:21:08
2nd: 06:39:12
3rd: 12:04:30
4th: 12:22:28

Bristol, UK

Tony

"John Carruthers" wrote in message
...
My times for Venus transit, from Walmer, Kent, UK, 51d 12m 00s N : 1d
24m 20s E.
250mm F6, 21mm zoom EP, 100mm dia Baader filter.

1st contact; 06-20-47 (BST, H-M-S,+/- 3s)
2nd ; 06-39-15
3rd ; 12-03-51
4th ; 12-23-35


I noticed a bright rim to the planet as it was aprox 7/8 onto the
solar disc at both ingress and egress.
An optical illusion or an atmospheric effect ?
John Carruthers


--
http://mysite.wanadoo-members.co.uk/jc_atm/



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"John Carruthers" My times for Venus transit, from Walmer, Kent, UK, 51d
12m 00s N
I noticed a bright rim to the planet as it was aprox 7/8 onto the
solar disc at both ingress and egress.
An optical illusion or an atmospheric effect ?
John Carruthers

Yes John,
From Brentwood, Essex I enjoyed a clear view of the entire
duration of the event, focussing most attention during ingress and egress
times.
With 150mm F8 refractor ( having Baader objective filter plus yellow
eyepiece filter and 8 - 24mm zoom eyepiece ) I was able to use the maximum
magnification of 150X , though often dropping back to 70 - 90 times to get a
more aesthetically pleasing full-disk view. Even during the low elevation
ingress event there was little boiling of the solar limb, and several small
sunspot groups, rice-grain effect and lighter faculae were clear.
I could detect no sign of a "Black Drop effect" visually, either at ingress
or egress,
-BUT I DID SEE THE "LIGHTED CUSP EFFECT" that you mention. When Venus was
part way off the edge of the yellow lit photospheric limb, then I could see
the upper atmosphere of the planet as an illuminated partial ring; but when
Venus was completely clear of the sun's limb I could not see this "cusp
effect" or any sign of fuzziness to the edge of the planet's position that
might be attributed to a Venusian atmospheric effect.

I did wonder whether this was just an optical illusion or unreal artifact,
but the high resolution images from the 1 metre aperture Swedish Solar
Telescope ( http://vt-2004.kva.astro.su.se/ ) certainly show the effect
clearly , at least for the egress: e.g. circa 11hr15m47s UTC. 11h12m06s
picture from this telescope appears to show all of that part of the
periphery of Venus beyond the photospheric limb as illuminated !

I certainly had not expected to see this effect during the Venusian transit
( as it is almost 'an opposite' of the expected but unseen black drop
effect ) ~ but comparing what I saw with the Swedish high resolution images
............... it does indeed seem to be a real rather than illusory effect
!

Incidentally, I also enjoyed a fine view of Mercury throughout the period of
Venusian transit, as I left a NexStar 11 GPS following Mercury with a 20mm
eyepiece. It was interesting for my visitors to make the comparison of the
blacked out Venus with the tiny but 87% illuminated Mercury : - practically
a reverse of the recent year's transit of Mercury event, when Mercury was
blacked out but larger than the apparent disk size of the then illuminated
Venus !

It's certainly fun being able to have successful real observational 'open
days' in bright sunny weather rather than damp / cold / dark nights :-)

Anthony

John, Anthony,

I could detect no sign of a "Black Drop effect" visually,
either at ingress or egress, -BUT I DID SEE THE "LIGHTED
CUSP EFFECT" that you mention ...

Thanks to David Tyler down in Selsey, at various times I was able to
use his 3.5-inch f/19 refractor equipped with a Herschel wedge. This
particular instrument delivered a very pleasing, high-contrast image.
While watching the egress of Venus just after third contact, I also
witnessed the effect you described. At first I thought it was an
optical illusion, but during a few moments of good seeing close to
11:08 UT it was quite distinct, but evidently short-lived. By the time
David took a look it was gone.

Regards, Ade

"Anthony Stokes" wrote in message
...

I did wonder whether this was just an optical illusion or unreal artifact,
but the high resolution images from the 1 metre aperture Swedish Solar
Telescope ( http://vt-2004.kva.astro.su.se/ ) certainly show the effect
clearly , at least for the egress: e.g. circa 11hr15m47s UTC. 11h12m06s
picture from this telescope appears to show all of that part of the
periphery of Venus beyond the photospheric limb as illuminated !

I certainly had not expected to see this effect during the Venusian
transit
( as it is almost 'an opposite' of the expected but unseen black drop
effect ) ~ but comparing what I saw with the Swedish high resolution
images
.............. it does indeed seem to be a real rather than illusory
effect
!

I saw it at both ingress and egress (as did the fellow observers that were
with me at the time). I also managed to catch in on camera...

http://www.smaal.info/astro_en/index...trophoto#venus

Jeroen.

It's certainly fun being able to have successful real observational
'open
days' in bright sunny weather rather than damp / cold / dark nights
:-)

Anthony

Yes, I saw some people I've known for years for the first time ! :-)
jc


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