I've done some more astrometry on this comet. The image is definitely stronger - indeed, stacking was not required to get a measurable image. Astrometrica...
... images. The comet is indicated by a line. The location of the comet in Ramons' image is indicated with a yellow circle. The stars marked with green circles...
... I agree with Reiner: in principle, photometry requires a different approach compared to astrometry. If you are going to compare magnitudes, you really need...
Magnitudes as requested.... See below. On the broader issue of photometry. Yes, I agree that you need to be careful when comparing magnitudes generated with...
... Thanks Dave, I assume these are with USNO-B1.0... what about UCAC-2? Ramon? I just want to see a table of these three stars and the comet, measured with...
Hi all, ... I tried with I Cousins filter last night. After 25min integration I reached around the level 17.6R USNO2.0A magnitude at SNR 5.0. I was not able to...
... reached around the level 17.6R ... (I used two 25min stacked ... Me too: stacking of 30 exposures, 60 seconds each. Cheers, Giovanni COMET 91P/Russell ...
8106
Robert Warren
cometman_75@...
May 3, 2005 4:41 pm
Good morning to all, Has any seen the newest issue of 'Astronomy' magazine? I ask because on page 101 in the Reader Gallery section, Ken Crawford has a photo...
Carey, ... This one looks *very * interesting, almost like a nice mag12-13 comet with elongated coma. The bluish color fits as well ;-) It is definitely *not*...
I agree with Reiner on this. It looks like an internal reflection of the bright star shown on the image. Typical characteristic of such reflections are that...
Hi group, Although I have tried hard to find info regarding the V and R filters (which and where to buy them, what is the price) in the message history, I...
... Hello Karel, I'm using two set of filters. One was custom made (from schott glasses), the second is a commercial set, I get from Astrovid. Get a look at:...
Well no more chasing Blue Spots. We were trying to figure out what was causing the reflection, the corrector on the SCT or the focal reducer, or something...
I've been trying to come up with the source of the reflection. The axial symmetry is the critical thing to explain - together with the fact that the image is...
... The optical axis of SCTs is often *not* exactly in the center of the CCD chip. Due to the mirror flips/flop/whatever it is typically off by a few...
That's right. But the reflection I see is symmetric about the centre (or very close to...) Which is a strong indication that it is NOT associated with the...
... measures. Dave, (I've just been catching up with this thread) and looking at the 30 March image you posted, there are at least two relatively bright stars...
Hello, we (M. Busch, F. Hormuth and me) observed the comet last night with the 1.52m telescope at Calar Alto without filters: NET USNO-B1.0 0091P C2005...
Hello, we (M. Busch, F. Hormuth and me) observed the comet last night with the 1.52m telescope at Calar Alto without filters: NET USNO-B1.0 0091P C2005...
Hello, we (M. Busch, F. Hormuth and me) observed the comet last night with the 1.52m telescope at Calar Alto without filters: NET USNO-B1.0 0091P C2005...
Hello, we (M. Busch, F. Hormuth and me) observed the comet last night with the 1.52m telescope at Calar Alto without filters: NET USNO-B1.0 0091P C2005...
