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New Giant Planetary Nebula
Apparently a new planetary nebula 2 degrees in diameter has
been discovered in Sextans south of Leo ( RA 10h37m dec 00d18m) See http://xxx.lanl.gov/PS_cache/astro-p...11/0311087.pdf I wonder is this would be visible visually. I suspect it would take a very dark site, and either Mark I eyeballs or 7x50 binos to see it. Tom Clarke |
#2
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New Giant Planetary Nebula
"Tom Clarke" wrote in message ... Apparently a new planetary nebula 2 degrees in diameter has been discovered in Sextans south of Leo ( RA 10h37m dec 00d18m) See http://xxx.lanl.gov/PS_cache/astro-p...11/0311087.pdf I wonder is this would be visible visually. I suspect it would take a very dark site, and either Mark I eyeballs or 7x50 binos to see it. It may never be visible. But I plan to try photographing it with Elite Chrome 200 film and a telephoto lens. I don't know if I'll get anything. Does it show up on the original Palomar Sky Survey red plates, I wonder? |
#3
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New Giant Planetary Nebula
Tom Clarke wrote:
Apparently a new planetary nebula 2 degrees in diameter has been discovered in Sextans south of Leo ( RA 10h37m dec 00d18m) See http://xxx.lanl.gov/PS_cache/astro-p...11/0311087.pdf I wonder is this would be visible visually. I suspect it would take a very dark site, and either Mark I eyeballs or 7x50 binos to see it. Tom Clarke Thanks Tom. -Sam |
#4
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New Giant Planetary Nebula
"Michael A. Covington" wrote:
Does it show up on the original Palomar Sky Survey red plates, I wonder? I just downloaded an image from the digitized POSS II red plate centered on the region and I don't see it. Digital downloads are limited to 1 degree square, though, so I could have been looking right through it and not know. I'd bet it shows up on the original 6.5 x 6.5-degree plate. Mike Simmons |
#5
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New Giant Planetary Nebula
"Tom Clarke" wrote in message
... Apparently a new planetary nebula 2 degrees in diameter has been discovered in Sextans south of Leo ( RA 10h37m dec 00d18m) See http://xxx.lanl.gov/PS_cache/astro-p...11/0311087.pdf I wonder is this would be visible visually. I suspect it would take a very dark site, and either Mark I eyeballs or 7x50 binos to see it. Tom Clarke After scanning the pdf document, I saw no mention of the surface brightness. Interestingly, the document makes reference to caluclating a surface brightness, but it seems to me that this value should have been stated. Perhaps it was and I simply missed it. I went to this second closest planetary's position by way of LEDAS and saw no trace of it. . .nor did I expect to; had there been, discovery would have occurred long ago. It seems to me that 7x50 binos, even combined with the darkest of skies, would be to little avail in spotting this truly huge object. I would welcome being in error with this assumption. What I did find interesting is that a fairly faint galaxy, NGC3325 at a visual magnitude of 12.7 and a surface brightness of 13.0 lies behind the gigantic planetary. A galaxy through a planetary would make a wonderful catch. . .NGC3325 at 1.2' x 1.1' is now on my list of new objects for the spring. -- Martin To reply remove "ilikestars" from my email address |
#6
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New Giant Planetary Nebula
Michael Covington wrote:
[Tom Clarke wrote:] Apparently a new planetary nebula 2 degrees in diameter has been discovered in Sextans south of Leo ( RA 10h37m dec 00d18m) See http://xxx.lanl.gov/PS_cache/astro-p...11/0311087.pdf I wonder is this would be visible visually. I suspect it would take a very dark site, and either Mark I eyeballs or 7x50 binos to see it. It may never be visible. But I plan to try photographing it with Elite Chrome 200 film and a telephoto lens. I don't know if I'll get anything. Does it show up on the original Palomar Sky Survey red plates, I wonder? Over lunch, I drove up to Lowell and had a look at the POSS II plates. To sum up, there's no organized nebulosity at the coordinates given in the paper on blue, red or near-IR exposures. The near-IR exposures are pretty crummy to begin with. Considering that this thing is not visible in the POSS images and is barely detectable in Ha and OIII images taken with the 2.5-meter Isaac Newton telescope, I'm going to go out on a limb and say it is definitely not a visual object. However, the central star is not only visible, but easily seen in moderate aperture under a reasonably dark sky. The central star is PG 1034+001, RA: 10h 37m 03.8s; Dec.: -00d 08m 19s (J2000). According to Brian Skiff, this is a very reliable Landolt standard star having a Vmag. of 13.23. It's B-V is -0.37, indicating a very blue object which is not surprising considering it is a white dwarf. MegaStar users and others not having the PG catalog can find this star by searching for GSC 04912-00085. Otherwise, you'll find it 45' due west of 8.47 magnitude HD 92390 in Sextans. Regards, Bill Ferris "Cosmic Voyage: The Online Resource for Amateur Astronomers" URL: http://www.cosmic-voyage.net ============= Email: Remove "ic" from .comic above to respond |
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