[Chaos-l] [obsessionusers] New Circumpolar Comet Yi-SWAN

[Allen Davis]

good luck

allen

On Apr 8, 2009, at 8:10 PM, <rfitzgerald1 at nc.rr.com> <rfitzgerald1 at nc.rr.com 
 > wrote:

> A good test will occur tomorrow at 12:26 PM (yes daylight) at 70  
> degrees due North.  This is a circumpolar comet for now so around 11  
> a.m. I'm going to try and capture it with my C-11 SCT.  Doubt I will  
> be successful but it will be interesting to try!
>
>
> ---- "E. Allen Davis" <starstorm151 at embarqmail.com> wrote:
>> Something that just appeared on the obession telescope yahoo  
>> group.  Maybe something to watch...allen
>>
>>
>>
>>
>>
>>
>> New comet discovered. Happy hunting!
>> ______
>> Howie (Residing In Akko Israel)
>> 15" Obsession #821 /Argo Navis/ServoCAT Jr.
>>
>> A small 8th-magnitude comet is now making its way slowly across  
>> Cassiopeia toward Perseus. The surprise visitor, called Comet Yi- 
>> SWAN, should be within reach of small telescopes for most of April  
>> and May 2009. However, bright moonlight will make it a challenge to  
>> spot until the second half of April.
>>
>> So far, observers describe the comet as a diffuse glow just a few  
>> arcminutes across. No one has yet reported a tail, but that could  
>> change in the coming days as the Moon's glare wanes.
>>
>> Because of its high declination, Comet Yi-SWAN is theoretically  
>> visible all night from mid-northern latitudes. But early rising  
>> skywatchers have the best chance, because Cassiopeia is highest  
>> during the predawn hours.
>>
>> On Saturday evening, April 11th, the comet passes just 0.4° south  
>> of Schedar (&#945; Cassiopeiae), so they'll be in the same low- 
>> power telescopic field. On Thursday night, April 23-24, the comet  
>> will glide only 1.2° south of the Double Cluster in Perseus.
>>
>> The Discovery
>>
>> Korean amateur Dae-am Yi was the first person to notice the comet.  
>> On March 26th, he obtained two images of it with a Canon 5D camera  
>> and 90-mm lens. But word was slow to reach the Central Bureau for  
>> Astronomical Telegrams (CBAT) at the Smithsonian Astrophysical  
>> Observatory in Cambridge, Massachusetts, the world's clearinghouse  
>> for comet discoveries.
>>
>> Independently, Rob Matson reported to CBAT on April 4th that he'd  
>> found a possible comet in SWAN images posted on the SOHO website.
>>
>> Recognizing that the objects were one and the same, CBAT  
>> astronomers announced the find on IAU Circulars 9034 and 9035 and  
>> gave it the name Comet Yi-SWAN (C/2009 F6). Preliminary  
>> calculations by Brian G. Marsden indicate the comet is traveling in  
>> a highly inclined parabolic orbit, tipped 85.7° to the plane of the  
>> ecliptic. At perihelion on May 8th, the comet will be 1.27  
>> astronomical units (190 million km) from the Sun and half again  
>> farther from Earth.
>>
>> The ephemeris below, from Marsden's orbital elements, gives the  
>> comet's right ascension and declination (equinox 2000.0) at 0 hours  
>> Universal Time on selected dates, along with its elongation angle  
>> from the Sun, predicted visual magnitude, and the constellation in  
>> which it lies.
>>
>>
>>
>>
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