I suspect Jupiter would be a great target, if we shoot nice quick images. We probably could put together a video of its rotation. Sounds good to me, Dave! ________________________________ From: Dave Bennett <dlbennett@mac.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, January 8, 2013 7:12 PM Subject: Re: [Utah-astronomy] Can someone check my calculations? Hey Patrick, As Kurt has shown for Honolulu, sunset on Feb 8th isn't until 18:26 HAST. It's closer to 18:21 for Wailuku on Maui. According to timeanddate.com for Wailuku ( http://www.timeanddate.com/worldclock/astronomy.html?n=1084&month=2&year=201... ) the end of Nautical Twilight is at 19:10 HAST. You actually may want to use your time imaging Jupiter (no joke) before astronomical twilight. Faulkes shows many examples of Jupiter pics. As for the Hour Angle question, I get closer to RA 02h 49m and 05h 49m respectively but I think that is splitting hairs. (Or hares? Lepus is on the meridian at the end of your run!) I'm not sure how far south in declination Faulkes can image but I've seen pics of the Great Barred Spiral in Fornax NGC 1365 and the Southern Ring Nebula in Vela NGC 3132 at -36 and -40 respectively. Aloha and best of luck...I can't wait to see the results. Dave Bennett Hilo, HI On Jan 7, 2013, at 9:18 PM, Wiggins Patrick wrote:
Thanks Kurt,
That pretty much agrees with some of the data I was looking at. I was surprised to see there is only a 3 hour difference between Utah and Hawaii. I thought it was at least an hour or two more.
Regarding the RA I asked about in my original post I forgot to mention my guesstimates so I'll do that now and hope I'm not embarrassingly off.
At the start of our observing session on 8 February at 2100 here in SLC (1800 at Haleakala) I think RA 02h 53m will be transiting in the south as seen from the telescope.
Which means when our session ends three hours later at midnight here in SLC (2100 at Haleakala) RA 05h 53m will be transiting in the south as seen from the telescope.
BTW, I see that right in the middle of the session Jupiter will be virtually at the zenith. But I think it will be too bright to image with 2 meters of glass. Too bad.
Cheers,
patrick
On 07 Jan 2013, at 23:35, Kurt Fisher wrote:
I do not have my home laptop with me with a planetarium program, so I cannot give you a specific RA. But here is a quick eyeball using referenced internet resources. Civil twilight is 49 minutes after session start. - Kurt
================ A) Algol appears to be transiting Honolulu at the session start
http://www.fourmilab.ch/cgi-bin/Yoursky
Algol is transiting Honolulu at Corresponding UTC (GMT) Saturday, February 9, 2013 at 04:00:00
================ B) Time differential
http://www.timeanddate.com/worldclock/converter.html
Salt Lake City (U.S.A. - Utah) Friday, February 8, 2013 at 9:00:00 PM MST UTC-7 hours Honolulu (U.S.A. - Hawaii) Friday, February 8, 2013 at 6:00:00 PM HAST UTC-10 hours Corresponding UTC (GMT) Saturday, February 9, 2013 at 04:00:00
================ C. Sunrise, Sunset, Moonrise
http://aa.usno.navy.mil/data/docs/RS_OneDay.php
U.S. Naval Observatory Astronomical Applications Department
Sun and Moon Data for One Day
The following information is provided for Honolulu, Honolulu County, Hawaii (longitude W157.8, latitude N21.3):
Friday 8 February 2013 Hawaii-Aleutian Standard Time
SUN Begin civil twilight 6:43 a.m. Sunrise 7:05 a.m. Sun transit 12:46 p.m. Sunset 6:26 p.m. End civil twilight 6:49 p.m.
MOON Moonset 4:11 p.m. on preceding day Moonrise 5:38 a.m. Moon transit 11:25 a.m. Moonset 5:14 p.m. Moonrise 6:27 a.m. on following day
Phase of the Moon on 8 February: waning crescent with 3% of the Moon's visible disk illuminated.
New Moon on 9 February 2013 at 9:21 p.m. (Hawaii-Aleutian Standard Time).
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