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OR: NGC4290, Pal4 (not) and Markarian 205

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#1 Jeff Young

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Posted 21 May 2011 - 10:26 AM

This session was characterized by quite good seeing, but poor transparency. I probably should have gone for some small Planetary Nebulae, but I had already written up my observing list.

NGC4290 4/7/2011 21:51 UT; Pickering 8, NELM 5.5, SQM 20.6
400mm Mak-Cass @ 160X

NGC4290 easy direct vision, although indistinct and with a very weak condensation. Averted-vision bar at 160X; direct at 250X. Circular averted-vision disk with fleeting hints of annularity (perhaps 20% of the time). Annularity more prominent at 160X than 250X.

NGC4284 a bit more work, especially pulling it away from the 2 foreground stars. Never quite direct, but easily holdable in averted. No condensation noted.

And yes, M40 is in the field as well (the double-star asterism to the right in the sketch).

Posted Image


Pal 4 4/7/2011 22:16 UT; Pickering 8, NELM 5.5, SQM 20.6
400mm Mak-Cass @ 1X

Not visible at 150X, 235X, 335X or 450X. Had a finder chart, so I knew exactly where to look. Tried wiggling, panning, averted-vision from all different angles, even my right eye. Nada.


Mrk205 QSO B1219+755 4/7/2011 22:40 UT; Pickering 8, NELM 5.5, SQM 20.6
400mm Mak-Cass @ 350X

Under similar conditions with the 16" SCT I couldn't make out the arms of NGC4319. I'm not sure whether it's the instruments, or just more experience, but the bar is now quite distinct (borderline direct/averted) and two larger lobes (extending out to the NW and SE) are holdable 75% in averted.

[I can't see the distinction between the inner ring and the outer arms, but the extent of the lobes clearly includes the much dimmer outer arms.]

I make out the quasar to be very similar in magnitude to several field stars in the mid-14s, and brighter than one at 14.7. My catalog has it at 15.2, but I think it's considerably brighter (at least visually).

Posted Image


Cheers,
Jeff.

#2 JayinUT

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Posted 21 May 2011 - 01:22 PM

Jeff,

Great report and terrific sketches. Nice read as I lay here getting over pneumonia. Thank you for sharing.

#3 Jeff Young

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Posted 22 May 2011 - 03:57 AM

Ugh. I had pneumonia last summer; I don't envy you. Take care of yourself.

Jeff.

#4 frank5817

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Posted 22 May 2011 - 06:20 AM

Jeff,

Always a pleasure to see your excellent deep sky renderings and well written reports. Your work is always in the best of the best category.
---

Jay- Get well

Frank :)

#5 timokarhula

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Posted 22 May 2011 - 10:39 AM

Mrk205 QSO B1219+755 4/7/2011 22:40 UT; Pickering 8, NELM 5.5, SQM 20.6
400mm Mak-Cass @ 350X

I make out the quasar to be very similar in magnitude to several field stars in the mid-14s, and brighter than one at 14.7. My catalog has it at 15.2, but I think it's considerably brighter (at least visually).


I observed NGC4319, NGC4291 and Markarian 205 on April 24. That night my SQM-L meter showed 21.61 (the darkest reading so far at my regular observing site) even when the solar altitude was -17ยบ.7 at midnight (not really astronomical night). Using my 10-inch Dob and 250x, I estimated the quasar as magnitude 14.3-14.4 visually. It appeared stellar or possibly substellar. That night I observed three quasars, including 3C273 in Virgo and OJ287 in Cancer (very faint). The fourth quasar / blazar, BL Lacertae, was not seen in the growing dawn twilight.

/Timo Karhula

#6 Jeff Young

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Posted 22 May 2011 - 11:06 AM

Thanks, Frank!

Timo, sounds like you've got nice dark (and dry) skies! My skies are so humid that astronomical twilight usually drops my SQM readings into the upper 19's / lower 20's.

I'll have to track down some of those other quasars; so far the only other one I have is Mrk421.

Jeff.

#7 Jim Curry

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Posted 22 May 2011 - 07:05 PM

Great stuff, Jeff. I'm still waiting for the tropical rain forest weather to clear out of New England. I have'nt been out in weeks, Ugh!
Jim

#8 Jeff Young

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Posted 23 May 2011 - 03:07 PM

Thanks, Jim!

Jeff.


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