Brian, Thanks for your data and description of your procedure. I will look at them in detail tomorrow. FYI: I and Peter Kusnirak took five hours of its...
1769
Petr Pravec
ppravec@...
Oct 1, 2000 5:49 pm
Hello all, Our link to Prague was down from Friday/Saturday night. Now it is up again, so I can write you what we got for 2000 DP107 during past two nights. I...
1770
Brian Warner
brianw_mpo@...
Oct 1, 2000 5:57 pm
Petr, I'm sending the data from my run last night (Oct. 1 UT) via private mail (I hope you're back up). I had an "anomaly" that appears real but would like ...
1771
Petr Pravec
ppravec@...
Oct 1, 2000 6:16 pm
Brian, Thanks for sending me your data (delivered ok). I will look at them and will let you know later on this evening. Petr...
1772
Petr Pravec
ppravec@...
Oct 1, 2000 6:44 pm
Just to clarify how it went. ... The message to Richard was sent by my wife who was visiting her parents (200 km from Ondrejov) yesterday. When I had realized...
1773
Petr Pravec
ppravec@...
Oct 1, 2000 8:44 pm
Brian, I analysed your data. After excluding some points affected by clouds, they agree with our data at most times. There is just one thing that strikes me:...
1774
Tony Cecce
tonycc@...
Oct 1, 2000 9:05 pm
Petr and Brian, This work is fascinating. Thank you for sharing the progress with the list. I would love to get involved I this type of observing, but I have...
1775
De Graff, David
degraff@...
Oct 1, 2000 9:44 pm
... From: Brian Warner ... I was, but that's around when the clouds hit. I'll keep an eye out when it comes to reduction time....
1776
Brian Warner
brianw_mpo@...
Oct 1, 2000 11:03 pm
David, Thanks. Petr's of the impression that the effect was false due to passing clouds. If you get the same effect at the same time with similar shape and ...
1777
Brian Warner
brianw_mpo@...
Oct 1, 2000 11:07 pm
Petr, Thanks for the kinds words. More important, I'm glad to hear the data is proving useful and may have lead to an interesting find. The events for the Oct....
1778
Brian Warner
brianw_mpo@...
Oct 1, 2000 11:25 pm
Tony, ... I would love to get involved I this type of observing, but I have no confidence in my photometry. My standard 3 sigma error is about the same as the...
1779
Brian Warner
brianw_mpo@...
Oct 2, 2000 3:57 am
Petr, No luck tonight and the rest of the week does not look good :=( If that should change, I'll get back on the asteroid for as long as the clouds allow. ...
1780
Bill Holliday
holliday@...
Oct 2, 2000 6:37 am
... I'm feeling a little guilty. I haven't seen a single cloud in four days and our nights are spectacularly dark right now. I''ve got a 0.4 meter scope, low...
1781
Petr Pravec
ppravec@...
Oct 2, 2000 9:23 am
Brian and all, ... I emphasise (to others mainly) that lightcurve data taken at ANY time are useful for modeling of the binary system. Sure, recording an...
1782
Petr Pravec
ppravec@...
Oct 2, 2000 9:30 am
Tony, ... I will write you some advices later when I have a little bit of quieter time. Brian has already wrote you and others may do too; I will respond to a...
1783
BEHREND Raoul
Raoul.Behrend@...
Oct 2, 2000 10:23 am
Hello, ... Well, I think that point 3 and 4 are not necessary... until point 2 is reached in a full manner. I explain me: - «dark»: it's important, as...
1784
Jeff Medkeff
medkeff@...
Oct 2, 2000 10:50 am
Short version: I've just updated 701's AquireImages script to support guided exposures in unattended, robotic mode. The code is a bit messy, but it works...
1785
Brian Warner
brianw_mpo@...
Oct 2, 2000 12:29 pm
Jeff, Interesting stuff. I recently implemented something like in my software, too. Once the scope is moved to it's new location and before a guided exposure...
1786
Brian Warner
brianw_mpo@...
Oct 2, 2000 12:34 pm
Raoul, ... When adding all these «few percents» (read few 0.01mag), the result cannot reasonabily be below 0.1mag... So, some flats are *necessary* if you...
1787
Matt Dawson
mgedawson@...
Oct 2, 2000 1:36 pm
Its absolutely fascinating watching the progress of DP107 photometry; Im glad you decided to keep it on-list. A general question. At the moment there seem to...
1788
brianw_mpo@...
Oct 2, 2000 2:18 pm
Matt, There are a few "official" outlets for lightcurves at the moment. Of most importance to amateurs is the Minor Planet Bulletin. One can submit his curves...
1789
Tomasz Kwiatkowski
tkastr@...
Oct 2, 2000 2:40 pm
... Brian, the CCD frame that is not flat-fileded introduces _systematic_ errors which may be difficult to trace down. So if you have, for example, a...
1790
brianw_mpo@...
Oct 2, 2000 3:32 pm
Tomek ... So my question is: how can you trust your data if you do not flat- field your frames? << And my question to you is why is using a flat-field a...
1791
Tomasz Kwiatkowski
tkastr@...
Oct 2, 2000 4:02 pm
... Absolutely true. To help remove them a good observing log is essential. You write down all that may be important, like at such and such hour a stripe of...
1792
cspratt@...
Oct 2, 2000 4:19 pm
You should be able to create flats from the images themselves by a median combine command. A good median command series will drop the stars leaving you an...
1793
loomberah@...
Oct 2, 2000 4:37 pm
... You should be able to create flats from the images themselves by a median combine command. Thats true if you have a bright sky. At Loomberah my background...
1794
Scott Young
Scott_Young@...
Oct 2, 2000 4:39 pm
... combine command. A good median command series will drop the stars leaving you an artificial flat. Unless you have good tracking...in which case you wind up...
1795
brianw_mpo@...
Oct 2, 2000 4:50 pm
Scott and Chris, The "artifical" flats sound interesting. I have about 300 images from each night, so I presume I may have enough of a pool. No my tracking was...
1796
brianw_mpo@...
Oct 2, 2000 5:03 pm
Tomek I wish getting flats was as easy as many make it out to be <g>. My point is one more of not turning off amateur efforts by being too strong in one's...
1797
Scott Young
Scott_Young@...
Oct 2, 2000 5:26 pm
... That's pretty much it, Brian. As someone pointed out, though, you want a signal level which is near your objects to be measured (i.e. stars and asteroids)....
