Die Suche ergab 58 Treffer

von Anton Norup Sorensen
20. Feb 2008, 22:18
Forum: Meteore
Thema: Seeking advice for building fireball station.
Antworten: 8
Zugriffe: 3912

I currently use low light 1/3" b/w cameras: CS-Mont: http://www.rfconcepts.co.uk/2046xai.htm and SK-1004X (32 x 32mm, Sony EXview 0,003 Lux board camera with 3.6mm lens) Dear Mark, Can you give an estimate of the minimum back focal distance for a lens to be used with the 2046XAI camera? I am consid...
von Anton Norup Sorensen
15. Feb 2008, 10:45
Forum: Meteore
Thema: Feuerkugel aus ssw - Hamburg 14.02. gegen 19.00 Uhr
Antworten: 2
Zugriffe: 1278

This one was caught by the camera in Brorfelde: http://www.astro.ku.dk/~norup/webcam/fb20080214.jpg A rough analysis with uncertainty of about 1 degree gives: Start: AZ=185.1 ALT=10.0 End: AZ=190.4 ALT=6.4 Location of Brorfelde: 11.665E 55.625N Time 18:50:51 MET +/- 6 sec Also about 30 visual observ...
von Anton Norup Sorensen
11. Feb 2008, 18:47
Forum: Meteore
Thema: Feuerkugel 8.2.2008 22:45 MEZ
Antworten: 4
Zugriffe: 1009

We have recieved two observations matching this: First is from Skaerbaek, 55.15N 8.77E (decimal deg) time: 2008-02-08 22:45 duration 1 sec Start Az: 190 End Az: 195 An accurate azimuth measurement is claimed Described as bright white with short tail, descending nearly vertical Second is from a car g...
von Anton Norup Sorensen
11. Feb 2008, 10:24
Forum: Meteore
Thema: Feuerkugel 8.2.2008 22:45 MEZ
Antworten: 4
Zugriffe: 1009

The trail appears double. Could this be an aircraft with landing lights turned on?
von Anton Norup Sorensen
29. Jan 2008, 09:09
Forum: Meteore
Thema: Zwei große Feuerkugelereignisse in Europa
Antworten: 4
Zugriffe: 1714

Re: Zwei große Feuerkugelereignisse in Europa

Hallo, My webcams in Copenhagen and Brorfelde luckily caught the fireball: Brorfelde: http://www.astro.ku.dk/~norup/webcam/trig_log/bro2_trig2008-01-27_comb.jpg Animation: http://www.astro.ku.dk/~norup/webcam/trig_log/bro2_trig2008-01-27.avi Copenhagen: http://www.astro.ku.dk/~norup/webcam/trig_log/...
von Anton Norup Sorensen
18. Jan 2008, 18:30
Forum: Meteore
Thema: Seeking advice for building fireball station.
Antworten: 8
Zugriffe: 3912

A very small step forward since last post: After getting hold of a Pinnacle Dazzle DVC 100 and finding a patched version of the v4l library, I have the frame grabber running fine on Fedora Core 6 and Ubuntu 7.1 Linux installations. A borrowed video camera showed disappointing performance - the faint...
von Anton Norup Sorensen
19. Okt 2007, 18:15
Forum: Meteore
Thema: Ungewöhnliche Meteore und Satelliten
Antworten: 9
Zugriffe: 3013

Auf spaceweather.com wird von einem ähnlichen Phänomen berichtet. Dort wird das Phänomen durch Flares geostationärer Satelliten erklärt.
But geostationary satellites appear... stationary! :)
They only appear as trails in long exposures when the camera is tracking the stars.
von Anton Norup Sorensen
25. Sep 2007, 12:09
Forum: Meteore
Thema: Meteoriteneinschlag in Peru?
Antworten: 52
Zugriffe: 16208

I am confused about the quite large crater compared to the fairly small mass and slow entry speed quoted above. From a simple numerical simulation with a lot of crude approximations, I find that the terminal velocity should be around 100m/s. This is the free-fall velocity of a spherical object with ...
von Anton Norup Sorensen
10. Aug 2007, 17:57
Forum: Meteore
Thema: Seeking advice for building fireball station.
Antworten: 8
Zugriffe: 3912

Thanks for your quick and detailed recommendation, Mark. I am eager to get away from webcams, and will try to get the USB capture box and use it with a video camera currently collecting dust. I suppose that your B/W video camera performs better in the dark than a typical webcam, although you say it ...
von Anton Norup Sorensen
9. Aug 2007, 21:28
Forum: Meteore
Thema: Seeking advice for building fireball station.
Antworten: 8
Zugriffe: 3912

Seeking advice for building fireball station.

Dear fireball hunters, I am member of a small group that will try to set up a network of meteor cameras in Denmark. The cameras are intended to be distributed to high-schools, where they will serve as educational tools as well as provide data on fireballs. So far, funding for a prototype station see...
von Anton Norup Sorensen
31. Jan 2007, 18:10
Forum: Meteore
Thema: Feuerkugel 25.1.2007
Antworten: 7
Zugriffe: 2890

With the help of Mark's Vechta image and visual observations, we are trying to narrow in a potential fall-out area. Note the map above has been updated with more observations. A re-examination of the Vechta image has lead to the following directions: Start: Az=39.4 deg Alt=21.1 deg End: Az=40.2 deg ...
von Anton Norup Sorensen
29. Jan 2007, 19:25
Forum: Meteore
Thema: Große Feuerkugel am 27.01.2007 gegen 17h50m [MEZ]
Antworten: 5
Zugriffe: 2602

About 20 visual observations of this event has come in by this, and it increased to now about 60 after a press announcement.

Here is a plot of the azimuth for many of these. Brightest color is the end of the observation.

Bild
von Anton Norup Sorensen
27. Jan 2007, 14:14
Forum: Meteore
Thema: Feuerkugel 25.1.2007
Antworten: 7
Zugriffe: 2890

Lovely picture, Mark! I have estimated the approximate directions from your photo: Start Alt 22 deg, Az 40 deg End Alt 6 deg, Az 39 deg The map above has been updated with this, along with Björns information and more Danish observations. My camera did not register anything, which means that the fire...
von Anton Norup Sorensen
26. Jan 2007, 09:32
Forum: Meteore
Thema: Feuerkugel 25.1.2007
Antworten: 7
Zugriffe: 2890

Four observations in the period 18:30-18:40 have been recieved from people in Denmark.

Bild
von Anton Norup Sorensen
30. Sep 2006, 17:54
Forum: Meteore
Thema: Feuerkugel 21.9.2006 06:14 MESZ
Antworten: 8
Zugriffe: 3505

Thanks for the analysis, Hartvig! The last couple of nights I have tried to make something similar manually, or at least put some limits on the quantities. The UFO-orbit analysis looks very reasonable. My site position is: Lat 55.698° Long 12.563° BTW, I think there is a typing error in the latitude...
von Anton Norup Sorensen
27. Sep 2006, 15:02
Forum: Meteore
Thema: Feuerkugel 21.9.2006 06:14 MESZ
Antworten: 8
Zugriffe: 3505

I have added the data from the Vechta observation in the figure above. It really looks like we have two photos of the fireball. The geographic location used for the Vechta camera is for Vechta town centre: Long: 8.289 E (8d17m20s) Lat: +52.731 (52d43m52s) How to interpret the Vechta timestamp of 06:...
von Anton Norup Sorensen
26. Sep 2006, 22:36
Forum: Meteore
Thema: Feuerkugel 21.9.2006 06:14 MESZ
Antworten: 8
Zugriffe: 3505

Thanks for the picture, Mark - could you try to derive some alt/az values from it? Observations started coming in from our web-form during the morning of sep 21, and this made me check the webcam image archive, which produced the image below: http://www.astro.ku.dk/~norup/webcam/trig_log/snap2006-09...
von Anton Norup Sorensen
26. Sep 2006, 21:30
Forum: Meteore
Thema: gelbe Feuerkugel die zerbrach
Antworten: 14
Zugriffe: 4529

Hi, The Danish fireball network has recieved visual reports on three fireballs during September 21. Two of these, at 19:30 and 22:05 are coinciding with the reports in this thread - the third I will describe in a separate post. Maps of the azimuth of the observations are shown, and are in the tables...