(meteorobs) It is a GLONASS (Re: satellite question)

Mike Hankey mike.hankey at gmail.com
Tue Jan 5 16:58:04 EST 2010


Terry,

Thanks for passing on these excellent resources.

Mike

On Tue, Jan 5, 2010 at 4:07 PM, Richardson, Terry R
<RichardsonT at cofc.edu> wrote:
> Mike,
>
> Something like 10 years ago i was working with some of our students doing meteor photography and helped them write a small program (maybe just a spreadsheet) to compare lenses with different photographic speeds and FOVs. As you know the problem is the faster the lens the greater the number of meteors captured but the smaller the FOV, the fewer meteors are recorded. I cannot find the file on my working hard drives but it might be archived somewhere so i will keep looking. In the meantime look at what the IMO has at these two web links on photographing meteors.
>
> http://www.imo.net/photo/handbook     <— a very nice work by Jürgen Rendtel
>
> http://www.imo.net/docs/01faint_meteors.pdf <—has a section on lens efficiency
>
> I will also keep looking.
>
> Clear skies,
>
> Terry Richardson, Mebane Chair
> Dept. of Astronomy
> College of Charleston
> Charleston, SC
>
>
>
>
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org on behalf of Mike Hankey
> Sent: Tue 1/5/2010 10:44 AM
> To: marco.langbroek at wanadoo.nl; Global Meteor Observing Forum
> Subject: Re: (meteorobs) It is a GLONASS (Re: satellite question)
>
> Hello,
>
> Marco thanks for the identification and Tony thanks for the added
> information. Next time I see something like this I will know what it
> is. Marco regarding the camera and lens configuration I used a Canon
> 40D and a Canon EF 24mm f/1.4L II USM. The EF lens I specifically
> bought for meteor photography but was disappointed when I used it and
> realized it had a smaller FOV than my Tamron (which cost 1/4 the
> price). I was attracted to the lens because of its fast focal ratio,
> but I wouldn't recommend this lens for meteor photography as its FOV
> is smaller than other cheaper lenses out there. I'm still searching
> for the perfect / best meteor camera lens if anyone has suggestions.
>
> Thanks,
>
> Mike
>
> On Tue, Jan 5, 2010 at 3:17 AM, Marco Langbroek
> <marco.langbroek at wanadoo.nl> wrote:
>> Op 5-1-2010 08:46, Marco Langbroek schreef:
>>
>>> Definitely a satellite, in a Molniya-type orbit. I'll try to identify it for you
>>> later today when back from work.
>>
>> Decided to try before I went for work.
>>
>> It is Kosmos 1948 (88-043C), a Russian GLONASS navigation satellite launched in
>> 1988. GLONASS is the Russian equivalent of the American GPS. They move in orbits
>> with a revolution period of two revolutions/day, at roughly 19000 km altitude
>> (that's some 12000 miles).
>>
>> - Marco
>>
>> PS: what camera/lens combination did you use?
>>
>> -----
>> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
>> e-mail: sattrackcam at wanadoo.nl
>>
>> Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
>> Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
>> SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html
>> Station (b)log: http://sattrackcam.blogspot.com
>> -----
>>
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