Baton Rouge Astronomical Society Forum

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PostPosted: February 20th, 2018, 3:56 pm 
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Joined: October 12th, 2009, 3:28 pm
Posts: 4127
Location: Baton Rouge, LA
The first of three Edge of Night twilight viewing sessions take place the Friday before the change from Standard Time to the questionably-helpful Daylight time. That will be Friday 9 March from 5:30pm to 7:30pm. Below is the planned schedule...
5:45pm to 6:30pm = Venus viewing
6:08pm = “civil twilight” begins (search for crepuscular rays)
6:15pm to 6:45pm = Mercury viewing
6:33pm = “civil twilight” ends; “nautical twilight” begins
7:01pm = "nautical twilight" ends; "astronomical twilight" begins
7:06pm to 7:14pm = magnitude 2.5 pass of Cosmos 1743
7:22pm to 7:29pm = magnitude 2.1 pass of ERS-2
7:29pm = "astronomical twilight" ends
The event has no admission fee and is for all ages. HRPO personnel encourage patrons to bring binoculars.

Definitions of the various twilights:
http://aa.usno.navy.mil/faq/docs/RST_defs.php


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PostPosted: April 11th, 2018, 11:09 am 
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Joined: October 12th, 2009, 3:28 pm
Posts: 4127
Location: Baton Rouge, LA
10 April 2018, 8:06pm to 8:17pm CDT
Cosmos 2322 rocket

It was quite easy to spot, even in twilight—and quite slow, due to its high altitude. It pass right below the Coma Berenices Cluster. 39 degrees in the southeast. Magnitude 2.6. 1257 km at closest.

10 April 2018, 8:36pm to 8:42pm CDT
Resurs 01 rocket

I pointed it out to Roz and we watched as it came very close (though a smidgen higher) than Alkaid. 36 degrees in the northeast. Magnitude 2.3. 1025 km at closest.

10 April 2018, 8:41pm CDT
Iridium #11

Really an anemic flare, but beggars can’t be choosers now. Of the nine flares on Peat’s list this week, #11 will be responsible for three of them. 28 degrees in the north. Magnitude 0.8. 1414 km during flare.

10 April 2018, 8:51pm to 9:01pm CDT
Envisat

This wasn’t on my generated H-A list of 3.0 and brighter, but I saw it flare three times—just west of Procyon, then when going under Castor and Pollux and finally while skimming close to Menkalinan. Each flare was the same brightness (about mag 0.4) and the same duration (about two to three seconds). 62 degrees in the west. Non-flaring magnitude 3.4. 855 km at closest.

10 April 2018, 9:26pm to 9:38pm CDT
Cosmos 2360 rocket

I spotted it first, then Scott C. then Roz. It cut through the head of Leo. 86 degrees in the southeast. Magnitude 2.0. 845 km at closest.


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PostPosted: June 16th, 2018, 4:57 pm 
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Joined: October 12th, 2009, 3:28 pm
Posts: 4127
Location: Baton Rouge, LA
HRPO's summer Edge of Night session will be Friday 6 July from 8pm to 10pm CDT. This will be the last of several Fridays that will not have a lecture. The Lecture Series will resume on 13 July with "Wonders of the Summer Sky".

The Edge of Night is for all ages and has no admission fee. Binoculars are strongly recommended.

More information:
http://hrpo.lsu.edu/programs/edge.html

The Various Twilights:
http://aa.usno.navy.mil/faq/docs/RST_defs.php


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