Re: (IAAC) Supernova 1999el in NGC 6951 brightening!
Thomas O'Hara,PhD schrieb:
> --- "Mario E. Motta" <email@example.com> wrote:
> > As I have a 32 inch in dark sky, I also would be up for these
> > challenges. By the way, are you grinding your own mirror?
> > Mario Motta
> Hi Mario,
> Great, the more the merrier. Attached, below, are the suggestions I
> have received so far today. If you have any to add, I'd enjoy the
> Yes, I'm doing it all. Presently working on the 12" secondary mirror: a
> convex hyperboloid made of fused quartz. Better a 32" under a dark sky
> than a 40" under construction! I'll soon have a website up, which
> follows the project's progress. First light will probably be ~18-24
> Good to hear from you. If you do attempt any of these listed below, I'd
> be interested to hear your experiences.
> Clear skies,
> Thomas O'Hara, PhD
> San Diego, California USA
here are some notes to the challenges...
> * Simeis 147
It should be visible in a 20incher under good conditions. The brightset part
(O[III]) is at RA 5h 43m Dec +28° 25'.
> * Einstein's Cross (G2237+0305): RA 22h40m29.8s Dec+03d21'30"
Iīve tried it last year under 6,7mag conditions but I had no success. The
brighter components have a magnitude of ~17mag (16,8/17,2/17,2/17,5magV)
> * Abell 85 (CTB 1) RA 23h59.3m Dec+62d27'
Andreas Domenico observed this one with a 18incher. Other german observers
(Ronald Stoyan/ Christian Fuchs) saw it using a 20incher.
> * Hickson 50 RA 11h14m14.9s Dec+55d11'33.4"
Hickson 50 (or Shk 5) has 5 members. I observed H 50A with my 20incher and
Andreas Domenico told me that he managed it with a 18incher under 7,1mag
conditions in the Austrian Alps. I think H 50 E (16,5mag) is visible in a
20incher. The other members might be visible in a 25 or 30incher.
> * PK 009-07.1 (IRAS 18333-2357), PN in M22
I tried this one last year in the Austrian Alps but after 1 hour observing
(O[III]- blinking) at diffrent magnifications (up to 640x) I couldnīt detect
> * Pease 1, PN in M15
Pease 1 (Kuster 648) is no problem for a 20incher. A buddy of mine saw this PN in
a 12incher and even in a 10incher at 350x(!).
Try JaFu 1 in Pal 6. The position is RA 17h 43m 57,4s
Dec -25° 11' 52"
or JaFu 2 inside NGC 6441 RA 17h 50m 10,8s
Dec -37° 03' 25"
Refernce:Jacoby et al. AJ 114, 6, 2611 (1997)
(I found these informations in DSO 114)
> * "Observing the Shakhbazian Compact Groups of Galaxies"
> by Andreas Domenico, Member of the VdS-Fachgruppe Deep-Sky, Germany
Andreas "catched" 13 groups using a 18incher. The faintest groups are reaching
19- 20mag. This would be a challenge for the big ones. Look at Andreas Domenicoīs
excellent Homepage (in english language).
Another challenge will be the observing the globular clusters around NGC 2403.
The 'brightest' member is ~18mag. For more informations look at Battistini,et. al
Astr.Astrophys., 130: 162 (1984).
A challenge for bigger scopes will be the observing of halo structures in
Planetary nebulae. The bright example is NGC 6543 in Draco. Donīt use a Filter to
see the halo because the halo is not prominent in O[III] like the PN (Strong in
Halpha, NII and SII).
Another PN showing halo structures is M 57. I could see a diffuse glowing at the
ends of the major axis with my 20incher under good conditions (6,7mag).
Bigger scopes show the entire Halo. For some further informations look at
"Extended filamentary structures in the halo of the Lyra planetary nebula NGC
6720" Moreno/Lopez Astron. Astrophys. 178, 319- 321 (1987).
Further PN with halos you will find in the "Hynes".
My actual project is trying to observe the HII regions in M 31. 2 weeks ago I
started my first attempts. I suspected a region in the A 67 complex. This region
is corresponding to C223/224. I used my 20inch LOMO Obsession with magnifications
of 320x/ 430x and 640x. I will try it again in the next time.
Has anybody observed the H II regions in M 31?
Please contact me.
Next year I will have probably access to a 43incher (!). I will try some of these
objects in the big scope. In the meanwhile I have to use my "little" ;-) 20incher
crispy skies and all the best for you, Jens from germany
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