[AZ-Observing] Re: Antennas on Saturday night
- From: Wayne Westlake <24launch@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 15 Feb 2010 17:05:18 -0700
I printed up a chart from my Starry Night software zoomed to the FOV
for my 15mm eyepiece. I did actually set a GPS out in my backyard for
a few hours about a month ago and entered the Lat/Lon in Starry Night.
I'll be curious to see how accurate it is. And to compare Starry
Night's ephemeris with what you put below.
Wayne
On Mon, Feb 15, 2010 at 3:12 PM, Tim Jones <tjmac@xxxxxxxxxxxxxx> wrote:
> Hi Wayne,
>
> Actually, I think it was the ephemeris data that I had. 90mm and 5.9 Mag
> should have been quite compatible. However, based on the models at
> Astronomy.com, Vesta should have been further East compared to what I was
> seeing (Algieba and LM 40 were centered in the eyepiece), so that combined
> with the fact that other objects were coming up dead center is why I suspect
> the ephemeris data.
>
> You "should" be able to spot it as it's at Mag 6 or so. a couple of views at
> 2 hour intervals should show enough relative motion to identify Vesta.
>
> Here's what is reported for tonight at 20:30 and 21:00 according to
> Astronomy.com's Stardome Plus:
>
> Time Right Asc Declination Azimuth Altitude
> Magn.
> 20:30 Vesta 10h20m20s 19°30'37" 88°05'01" 34°20'33" 5.9
> 21:00 Vesta 10h20m21s 19°30'27" 84°11'26" 28°04'40" 5.9
>
> And, these are almost 1' 30" in both RA and Dec different than the same times
> as provided by JPL's ephemeris generator. Granted, I'm using a generic
> "Phoenix, Az" instead of a more precise Lat/Long, but 1' 30" for the same
> location??? Does anyone else have tonight's info to compare? We suspect
> that this is a difference caused by J2000 versus JNow values. Anyone else?
>
> Tim
>
> On Feb 15, 2010, at 1:57 PM, Wayne Westlake wrote:
>
>> Tim,
>>
>> Was your trouble finding Vesta due to the size of your scope or the dimness
>> of the object?
>>
>> I'm attempting to locate it in my backyard in S Phx with my 10" Dob. I need
>> to monitor that patch of sky either a few nights in a row and/or a few hours
>> each time to find out what's moving. But I'm not sure if it's futile with
>> the light pollution. I'm nearly up against the mtn so my view SSE, S and
>> SSW are relatively light pollution free - well, better than looking due N
>> right into Phx.
>>
>> Wayne
>>
>> On Sun, Feb 14, 2010 at 1:33 PM, Tim Jones <tjmac@xxxxxxxxxxxxxx> wrote:
>>> A truly outstanding evening for all. Bob and I enjoyed getting to the
>>> eyepieces for the first time since October and our wives breathed a sigh of
>>> relief to be rid of us for the night :-) .
>>>
>>> As Steve mentioned, the wind refused to die after sunset, so the apparent
>>> temp was far lower than the 54º that it actually hit around 2AM, but the
>>> views were spectacular.
>>>
>>> And, even though I was christening my new CG-5 mount, the skies gave us
>>> some amazing views.
>>>
>>> My only disappointment was an inability to draw Vesta out of the
>>> surrounding stars. Maybe later in the week...
>>>
>>> Tim
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