[Chaos-l] Comet 103P/Hartley 2

[Tony Rice]

Sorry, I meant to say my software puts 103P/Hartley  1.5 degres east
of alpha Cassiopeiae (Shedir)
-Tony

On Wed, Sep 29, 2010 at 11:11 PM, Tony Rice <rtphokie at gmail.com> wrote:
> Sounds like your software's ephemeris data is a bit out of date.
> Earth and Moon themselves and even asteroid belt objects can alter the
> path enough to introduce significant error into old orbital data.   My
> software with the latest data from JPL's Horizon system
> (http://ssd.jpl.nasa.gov) puts 103P/Hartley about a degree and a half
> on Oct 1 which lines up with Sky and Telescope's chart.
>
> If your software can update it's orbital data, see if it can take
> output from Horizon.  If not, let me know what parameters it uses for
> solar system objects (epoch, inclination, mean anomaly, etc.) and we
> can get it updated.
>
> -Tony
>
> On Wed, Sep 29, 2010 at 9:15 PM, Robert Nielsen <robertnielsen at nc.rr.com> wrote:
>> Tony (or someone else),
>>
>> I'm confused.   According to the chart and text in the Sky and Telescope
>> article, Comet 103P/Hartley 2 should be right next to Alpha Cassiopeiae on
>> October 1st.  But both of my planetarium programs show it way down in Auriga
>> on that night.
>>
>> Which is it?  Am I looking at erroneous data ... or the wrong comet?
>>
>> Robert
>>
>> On 9/29/2010 11:21 AM, Tony Rice wrote:
>>
>> Comet 103P/Hartley 2 is approaching and will be in a easy to locate
>> spot (near Cassiopeia) over the next couple of weeks.  But at
>> magnitude 5-6 will be a bit of a challenge to observe in light
>> polluted skies.
>>
>> http://www.skyandtelescope.com/observing/home/102632669.html
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>