Friday, December 07, 2018

tried for Pal 1 (Halifax)

Another image that took a while to get was for Palomar 1 in Cepheus. And in the end, was it worth it? I can barely see anything. Hover over the image to get the location of the dim globular. Magnitude 13.6? I dunno.

This was an attempt to improve on the result from about a year ago.

very dim and small globular cluster Palomar 1 with red filter

Red filter only, 60 seconds subexposures, 10 stacked shots. FITS Liberator, Paint.NET. North is up; east is left. Annotated.

Again, it took some effort to get this.

Submitted the first request on Nov 12, centred on the star GSC 04517 01909. But I goofed with very short exposures, at 10 seconds.

Resubmitted, asking for 60 seconds each. Also, I decided to drop the LUM.

I broke Ralph! Something happened. I still don't know what exactly. Mr Lane forwarded the log. "! In script 'sm-proc-request.dtl' (line=202) - Fatal error - uncaught application error." Yikes. Crashed it good.

Dave suggested I "try again" so I submitted another job (using the exact same content) which was accepted... Assigned ID number 7013.

Meanwhile job 7007 appeared. Same request. Maybe Dave tried it again. 

So I had two asks in the job jar. Normally you can't do that.

This morning both were processed! Double data! Curiously, the first set, from 3:37 AM AST, looked better. The second set was captured at 04:16 AST.

Why do I bother? Maybe it's silly going after these with a tiny telescope. The Palomar Sky Survey was completed in the 1950s with a 48-inch instrument. Π r squared so 4 times the light gathering power. In a less light polluted world.


Wikipedia link: Palomar 1 and National Geographic Society – Palomar Observatory Sky Survey.

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