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Subject: Re: [M]: [M] Off Topic -- What is ir??
From: Frank Loch
Reply To: mapug@shore.net
Date: Sat Jun 07 02:54:32 1997
> Frank, try the following (horrible!) URL:
> http://www.livesky.com/cgi-local/dss.cgi?r=202.485853&d=47.230629&h=15.787702&w
> =20.899220&u=11230&v=2&p=265
>
> That should give you a DSS image of the area in question. If that fails
> try this one:
>
> http://stdatu.stsci.edu/cgi-bin/dss_search?v=3&r=202.561921&d=47.228696&e=J2000&
> h=5.228114&w=6.920799&f=gif&c=none&fov=None
>
> Your directions are still ambiguous as to which way is east. The usual
> convention is to measure position angles from north proceeding towards east
> with the brighter object taken as the center. Thus with the brighter
> object at the center north is zero degrees, east is 90, etc. This
> convention eliminates the need to describe the orientation of the image in
> question. By this measure the PA from NGC 5195 to IC 4278 is about 104
> degrees, about 4 minutes distant.
>
> From the NGC/IC Project database at
> http://www.ngcic.com/pubdb.htm
> I find little info other the Dreyer's cryptic "F,vS,R,bM,f M51" which can
> be decoded via the instructions at
> http://www.seds.org/billa/ngc.html
> to "faint, very small, round, brighter in the middle, following (east of)
> M51". That conflicts slightly with your description as "edge on" but
> that's not too surprising as this guy is really faint. The DSS image looks
> slightly flattened to me, too. (Far be it from me to criticize him, but
> Dreyer may not have seen it as well as the Palomar image.)
>
> ---
> Bill Arnett billa@znet.com http://www.seds.org/billa/
>
Bill -- Thanks for all the good info. I think you've nailed it just
fine. Also thanks for the clarification on the Axis convention. I
have a problem sometimes getting my brain to disengage from engineering
conventions to Astro conventions .
I'm going to try all those websites to see what I can gleen from
them. Again thanks much.
Best regards,
Frank Loch
Try Deep Space 99 at http://www.early.com/~floch/index.html
For Gemstone information try: http://ourworld.compuserve.com/homepages/FLoch/