What do you think about this image?

sgcullen · September 24th, 2007, 03:59 PM

On Spaceweather.com today, an image appears that says that Venus cast a shadow of the photographer's telescope against a building (see attached). The image is a 6 minute exposure at ISO 800.

My question is this...

If Venus cast the shadow of the telescope on the building, wouldn't the shadow be "smudged" by the rotation of the Earth just like the stars are trailed in the image? The shadow appears sharp to me as if cast by a local light.

What do my fellow SpaceSpotters have to say?

Astrogirl · September 29th, 2007, 01:36 PM

Well, i won't pretend to know anything about long exsposure photography but, logic tells me your right Steve. I would expect to see some trailing/smudging being it was 6 mins and agree with the image being sharp. I've seen other images and this does seem rather more like a local light than Venus.

Hope i'm wrong!!!

ASHWIN · July 2nd, 2008, 06:31 AM

I AGREE THAT THE IMAGE IS QUITE SHARP AND MUST SURELY BE CASTED BY A LOCAL LIGHT OR DURING A SUNSET.BUT HOW COULD IT BE PREDICTED THAT THE SHADOW IS CASTED BY VENUS LIGHT , BECAUSE ITS INTENSITY SHOULD BE QUITE LOW .THERE HAS TO BE SOME REASON OR EVIDENCE DEFENDING THIS STATEMENT ,IS THERE ANY?

September 24th, 2007, 03:59 PM	#1 (permalink)
sgcullen Administrator [View SpaceSpot Album] Join Date: May 2007 Location: Oro Valley, AZ Posts: 157 Status: Offline	What do you think about this image? On Spaceweather.com today, an image appears that says that Venus cast a shadow of the photographer's telescope against a building (see attached). The image is a 6 minute exposure at ISO 800. My question is this... If Venus cast the shadow of the telescope on the building, wouldn't the shadow be "smudged" by the rotation of the Earth just like the stars are trailed in the image? The shadow appears sharp to me as if cast by a local light. What do my fellow SpaceSpotters have to say? Attached Thumbnails __________________ Mondo brings you the ultimate enthusiast communities on the web.

September 29th, 2007, 01:36 PM	#2 (permalink)
Astrogirl Senior Member [View SpaceSpot Album] Join Date: Jun 2007 Location: London Posts: 166 Status: Offline	Well, i won't pretend to know anything about long exsposure photography but, logic tells me your right Steve. I would expect to see some trailing/smudging being it was 6 mins and agree with the image being sharp. I've seen other images and this does seem rather more like a local light than Venus. Hope i'm wrong!!! __________________ Karah http://karahsastronomy.blogspot.com/

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

July 2nd, 2008, 06:31 AM	#3 (permalink)
ASHWIN Junior Member Join Date: Jun 2007 Location: NEW DELHI,INDIA Posts: 13 Status: Offline	I AGREE THAT THE IMAGE IS QUITE SHARP AND MUST SURELY BE CASTED BY A LOCAL LIGHT OR DURING A SUNSET.BUT HOW COULD IT BE PREDICTED THAT THE SHADOW IS CASTED BY VENUS LIGHT , BECAUSE ITS INTENSITY SHOULD BE QUITE LOW .THERE HAS TO BE SOME REASON OR EVIDENCE DEFENDING THIS STATEMENT ,IS THERE ANY?

Username:	Password:

Remember Me?

Attached Thumbnails