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frank5817
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Reged: 06/13/06
Posts: 7212
Loc: Illinois
Re: Venus 05.04.07 through 05.16.07 new [Re: Tommy5]
      #1654739 - 06/10/07 04:13 PM

Tommy5 and Michael,

Thank you both. The weather and seeing conditions were as good as they usually get in south Cook county.
_________

Michael,

Very nice sketch above and congratulations on your Venus sketch on ASOD today.

Frank

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frank5817
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Re: Venus 05.04.07 through 05.16.07 new [Re: frank5817]
      #1658280 - 06/12/07 10:15 AM Attachment (70 downloads)

Sky transparency was too poor before sunset to pick Venus out with the unaided eye so I swept the region of the sky it was located in with a 28mm eyepiece until I found it. I attached a Wratten 47 violet filter to an eyepiece to view and sketch the albedo features of Venus if visible.

Equipment: 18" f/5 Dob., 6mm ortho eyepiece (381X)
Wratten 47 filter
Seeing: Pickering 7
Transparency: below average 2/5
Time: 0:00-0:18 UT 6-12-2007
Sketching:
9"x12" black Strathmore Artagain paper background only
White sketching paper cut to shape of planet
2H graphite pencil blended with index finger
brightness slightly adjusted using Imageenhance.

Frank McCabe

Attachment

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Erix
Toad Lily


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Posts: 24022
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Re: Venus 05.04.07 through 05.16.07 new [Re: frank5817]
      #1658303 - 06/12/07 10:32 AM

Outstanding observations, everyone!

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Erika
Automatic doors make me feel like a Jedi.

Zhumell 16", 10" LX200 Classic,Celestron 102 XLT, ETX70-AT, DS Maxscope 60mm, AT6RC
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ScottAz
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Reged: 02/06/05
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Re: Venus 05.04.07 through 05.16.07 new [Re: Erix]
      #1659275 - 06/12/07 06:04 PM

Fantastic sketches, one and all! Thank you!!

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Scott Azmus
18" Obsession
NexStar 11 GPS
Celestron 8SE
AT80ED (f/7)


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CarlosEH
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Reged: 01/19/05
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Loc: Pembroke Pines, Broward County...
Re: Venus 05.04.07 through 05.16.07 new [Re: ScottAz]
      #1659958 - 06/13/07 03:26 AM

Frank and Michael,

Excellent observations of Venus. The albedo features recorded are very interesting. Keep up the good work.

Carlos

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frank5817
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Reged: 06/13/06
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Loc: Illinois
Re: Venus 05.04.07 through 05.16.07 new [Re: CarlosEH]
      #1660459 - 06/13/07 11:40 AM

It was great of Sol to start this thread and good that Michael and T5 jumped in early on. I haved learned a lot along the way and so far it has been fun.
Thanks for looking in on us. Hopefully we have weeks to go.
Frank

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Special Ed
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Reged: 05/18/03
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Loc: Greenbrier Co., WV 38N, 80W
Re: Venus 05.04.07 through 05.16.07 new [Re: frank5817]
      #1661155 - 06/13/07 06:28 PM

Frank,

Great observation and sketch. Along with the shadings in the cloudtops, you show a little cusp extension to the north and a little blunting to the south on the terminator as well as a slightly concave terminator. With your observing skills, mega-aperture, and the high altitude of Venus at the time of your observation, I would take this observation to the bank.

Thanks to all for the kind words. Observing Venus this apparition has been a great experience.

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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
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Tommy5
Carpal Tunnel


Reged: 03/28/04
Posts: 2523
Loc: Chicagoland
Re: Venus 05.04.07 through 05.16.07 new [Re: Special Ed]
      #1661343 - 06/13/07 07:46 PM

Another great sketch of venus those albedo features are drawn just as they are seen in the eyepiece great job.

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Sol Robbins
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Reged: 12/01/03
Posts: 1985
Re: Venus 05.04.07 through 05.16.07 new [Re: Tommy5]
      #1661608 - 06/13/07 10:01 PM

Really interesting sketched observations.

Thanks.

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S.R.


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Sol Robbins
Carpal Tunnel


Reged: 12/01/03
Posts: 1985
Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1665560 - 06/16/07 01:33 AM Attachment (85 downloads)

Hi,

Finally had clear sky and good seeing. I made 3 Venus sketches using my 9.75" reflector all at 397x. I view in IL, with a Wratten 47 violet and then a Wratten 25A red. Then albedo features were markedly different in each view. All sketches were done back to back.

The sketch below is in IL. This sketch was done with an HB pencil, blended with my finger and whites erased out.

Attachment

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S.R.


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Sol Robbins
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Reged: 12/01/03
Posts: 1985
Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1665563 - 06/16/07 01:37 AM Attachment (78 downloads)

The sketch below was done observing with a W47 filter.

I used both 4H and HB pencils. Blending was done with my finger and whites were erased out.

Attachment

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S.R.


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Sol Robbins
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Reged: 12/01/03
Posts: 1985
Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1665566 - 06/16/07 01:42 AM Attachment (78 downloads)

This last observation was done using a W25A filter.

Sketch was done using a tortillion for a base tone, an HB pencil and whites were erased out.

Attachment

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S.R.


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CarlosEH
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Reged: 01/19/05
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Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1665639 - 06/16/07 04:25 AM

Sol,

A very impressive set of Venus observations made in various wavelengths. I am very proud of all of the incredible Venus observations made by all participants of this thread. Thank you for sharing them with us all.

Carlos

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Sol Robbins
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Reged: 12/01/03
Posts: 1985
Re: 3 Venus Sketches 6.16.07 new [Re: CarlosEH]
      #1665849 - 06/16/07 09:48 AM

Thanks Carlos.

I also would like to thank everyone who has posted their observations and insights regarding Venus during this apparition.

Its been a lot fun and very interesting. I don't believe there has been a concerted effort for amateurs to memorialize a Venus apparition, other than the BAA, the way it has taken place in a relaxed way here on CN.

Thanks again.

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S.R.


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frank5817
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Reged: 06/13/06
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Loc: Illinois
Re: 3 Venus Sketches 6.16.07 new [Re: CarlosEH]
      #1665853 - 06/16/07 09:50 AM

Sol,

Great sketching, the features do seem to change quite rapidly over time and with different filters instantaneously. Excellent post.

Frank

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Sol Robbins
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Reged: 12/01/03
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Re: 3 Venus Sketches 6.16.07 new [Re: frank5817]
      #1665919 - 06/16/07 10:57 AM

Frank,

Changes in the albedo features with different filters were striking to say the least.

Thanks.

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S.R.


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Tommy5
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Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1666612 - 06/16/07 08:13 PM

Excellant venus sktches, i think Lowell had sketches "canals" on venus, i can see how your accurate views and and a little imagination could yield such features, great job and thanks for he interesting way you compared different filtered views.

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Sol Robbins
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Reged: 12/01/03
Posts: 1985
Re: 3 Venus Sketches 6.16.07 new [Re: Tommy5]
      #1666977 - 06/17/07 12:27 AM

Thanks T.

Isn't it believed that Lowell sketched the shadows of the blood vessels in his eye in his Venus observations?

I think astro-archeo-optometrists ,sp?;), used his Venus sketches to diagnose him having hypertension.

Best,

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S.R.


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Special Ed
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Reged: 05/18/03
Posts: 6339
Loc: Greenbrier Co., WV 38N, 80W
Re: 3 Venus Sketches 6.16.07 new [Re: Sol Robbins]
      #1667464 - 06/17/07 12:18 PM

Sol,

A really great set of observations--fast work, too. Your fingers were flying.

You appear to have recorded cusp caps in both filtered observations. The comparison with different filters (and no filter) was a good idea. The sketch using the W25 looks alot like what I see with the W80A, e.g., the well defined limb arc and shadings out to the limb arc. My last observation I tried a quick look with my W23A filter and was surprised that it seemed to show the same view as the 80A but with better contrast (I ended up stacking the W80A and the W11 for the observation). I'm going to take a longer look with it next time (soon I hope).

This is a great (and educational) thread and your oustanding contributions have set a high standard for it. I'm glad that Tom Trusock has called attention to this discussion.

Btw, according to Price, Antoniadi did not think Lowell's "spokes" on Venus really existed. Linear features were seen and sketched 55 years later by R.M.Baum (who had no knowledge of Lowell's Venus observations).

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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery


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Acheron
scholastic sledgehammer


Reged: 08/07/05
Posts: 813
Loc: Croatia, Velika Gorica
Re: 3 Venus Sketches 6.16.07 new [Re: Special Ed]
      #1667768 - 06/17/07 03:39 PM



This is my latest sketch of Venus, made just hour ago at 18:50UT.

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I like sketching...

8" F6 Dob - "Betsy"
12" F5 Dob - "Tristac"


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