The Astronomical Society of the Toms River Area
ASTRA club message board

It is currently Wed Jun 19, 2019 2:02 pm

All times are UTC - 5 hours




Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Sun Feb 19, 2012 7:15 am 
Offline

Joined: Thu Oct 13, 2011 6:28 am
Posts: 28
Great report Rich. Glad you were able to catch a good night for a change. Its been a while sense I've been out, and I am hoping some agreement can be reached with the State about Coyle Field so everything can go back to normal again. Here's hoping we meet at Coyle before the next meeting.


Ed Mullen


Top
 Profile  
 
PostPosted: Sun Feb 19, 2012 4:47 pm 
Offline
User avatar

Joined: Thu Oct 13, 2011 12:53 pm
Posts: 286
Location: Maple Shade, NJ
Rich,

Indeed, it is a nice report and it causes me to regret even more that I didn’t get out myself on Friday night! I’m hoping Monday night holds up as predicted since I still have the scope in the car from last Wednesday night at Carranza Field.

Anyway, you note that Venus was at “1/4 phase.” I presume you mean it was similar in appearance to a quarter moon rather than being 25% illuminated (lunar “quarters” refer to the orbital position, not the illumination, although the visible face of the moon is half illuminated at the first and third quarters). I mention this point because according to the USNO, Venus was about about 68% illuminated this past Friday evening (so it’s gibbous). Venus won’t reach dichotomy (50% illuminated) until March 29th, a couple of days past greatest eastern elongation (although the Schröter Effect can make it look like 50% several days before or after dichotomy).

As you can see on the USNO image, the gibbous shape isn't all that obvious compared to a half-illuminated disc, and seeing it through a scope is further compounded by the brilliant glare of Venus. I often use a moon filter on the eyepiece to cut down the glare and get a better view of the disc (it works for bright ISS passes too).

_________________
Joe Stieber
http://sjastro.org/
Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
POWERED_BY