We frequently read that a giant planet can perturb a smaller body and either throw it out of its stellar system or into its star. Could the brief stellar...
Hi Alan, Thanks for mulling-over the problem of how it could happen Alan. I don't have a theory myself. I've thought about a lot of different ideas but in the...
... I'm comparing several sources (RevNGCIC, NED, http://338arps.com) and I can hardly find any consensus on members of any particular Arp galaxy. This is...
Robert Matson has found a bright comet on SWAN spacecraft images in the northern sky. Though announced on IAU Circular 9034, there is no orbit or ephemeris...
Brian Skiff
bas@...
Apr 6, 2009 10:10 pm
22114
Hi all, The orbital elements and ephemeris for Comet 2009 F6 (Yi-Swan) are now posted at http://www.cfa.harvard.edu/iau/Ephemerides/Comets/2009F6.html.? I...
... ...punctuation deleted at the end of the URL (which will now work). More astrometric details are on the related MPEC: ...
Brian Skiff
bas@...
Apr 7, 2009 9:06 pm
22116
Les asked whether the impact of Fragment R of Comet Shoemaker-Levy 9 significantly brightened Jupiter. No, it did not, but Fragment R was merely a 1km diameter...
Hi Alan, ... But alas not nearly as energetic as the star itself... Perhaps this sort of thing could be detected with sensitive instruments, but I believe that...
15480 Empire Rd. Benson, AZ 85602 hm ph: 520-586-2244 Congratulations to the observer Yi for being able to detect even a fairly bright comet from Korea. Right...
Hi Alan & All, Alan wrote: "Like Les, I am not a professional, so will refrain from further speculation." No mate, not at all -- as I said I really appreciate...
Yes, I agree that the microlensing events---at least the ones that have been observed---are rather slow, many days/weeks/months. The example shown on the...
Brian Skiff
bas@...
Apr 8, 2009 9:10 pm
22124
... Just snip the .? off the end of the URL, thus: http://www.cfa.harvard.edu/iau/Ephemerides/Comets/2009F6.html \Brian...
Brian Skiff
bas@...
Apr 8, 2009 9:23 pm
22125
The "." at the end of the URL was my error (a habit from ending sentences with periods ;o) but the "?" is spurious and appeared elsewhere in the message; a...
Brian Skiff notes: I've wondered how you would record them in some reproducible way. The brute-force approach is simply to start recording images of some nice...
While browsing recent journals I noticed a paper by Perina et al dealing with HST observations of a luminous open cluster in the Andromeda Galaxy. The results...
Brian Skiff
bas@...
Apr 12, 2009 8:41 pm
22128
Here's my last observation of the cluster with an 18-inch Starmaster at 300x. The dimensions I mention (10"x5") were purely an estimate but indicates it...
The various large-scale HST images shows it elongated in pa 45, though it could be that some of the "bright" (mag 16-17) field stars in the immediate vicinity...
Brian Skiff
bas@...
Apr 13, 2009 7:02 pm
22130
A fairly bright supernova has been reported very close to the center of NGC 4088. This a bright (V mag 10.5) galaxy in Ursa Major. The object is reported to...
Brian Skiff
bas@...
Apr 15, 2009 2:32 am
22131
Anybody see the PBS program "400 Years of the Telescope"? There is a section on the Hubble Space Telescope, and right after they talk about how they fixed it,...
Jerry, The Witch Head is huge. I would guess it would take hundreds of frames to mosaic that with even its biggest field. Most likely an amateur image....
It definitely looked like an amateur photo. What I want is accuracy... it's not just TV, it's public television, which I hold to a higher standard than, say,...
I put my 12.5" dob out in my backyard and had a look. The SN stands out quite well. I also had a go at it with my 6" dob. At 240-300X and averted vision I was...
Brian, Thanks for the tip. I looked at it last night with one of our 10-inch scopes. 'Twas easy. I'd been observing for hours before I looked at it, so I...
I also took a peek at SN2009dd last night with my 10-inch Dob @125x. I judged the supernova to have the same brightness as a 13.6 magnitude star 7' NE of it....
Congratulations on pushing your limits! For me, I see my limits as a range. I can see perhaps down to x but my guaranteed limit is not as deep. Similarly...
Hello, I captured an image of the galaxy and supernova with a 23.5 cm Schmidt-Cassegrain telescope on Saturday morning (UT) during a single 90-second exposure...
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