Archive for Februar, 2008

Dienstag, Februar 26th, 2008

Station Map for the Occultation by (9) Metis at Monday, 2008 December 29 (~ 22:53 UT)

Good Test for Video Equipment

V-Magnitude of target star TYC 0637-00036-1: 12.0 mag
Johnson B-V Colour Index: + 1.3
The UCAC2 gives a „pseudo-R magnitude“ of  11.8 mag

Please notice:

The combined light of star and asteroid will be ~ 9.8 mag (the magnitude of the asteroid) during an occultation!

„Occult Watcher“ indicates (9) Metis as suspected binary asteroid!

The max duration is expected to be 35.5 sec with a max drop of 0.13 mag only.

David Dunham (IOTA) wrote about this small drop in magnitude:

„This occultation by a large asteroid and a fainter star provides a good test of video equipment, to see what can be recorded, preferably from several sites so that the consistency of results can be assessed from a fit of the observed chords. Metis‘ mag. will be 9.8 while that of the star is only 12.0, producing a magnitude drop of 0.13 (or 0.16 in red).

Tony George recorded a similar event in 2006 (see below), but nobody else recorded it. We are trying to see how small the mag. Drop can be and still obtain reliable results from video, so this Dec. 29th event is a good opportunity for that. Recently, a few IOTA observers in the southern USA recorded an occultation of a faint star by (4) Vesta with a mag. drop predicted to be only 0.01, and Limovie analysis failed to find the occultation in any of the recordings; that small a drop is too small for our video equipment to reliably detect. Other events with mag. drops of 0.2 have been successfully recorded with video equipment in the USA.“

Tony George about his experience and the event at Dec 29:

„I successfully observed an occultation by Metis in 2-13-2006. It was video recorded. I defocused the target star to make sure pixels were not saturated. The mag drop was 0.12, similar to this event. The SNR was 0.64, relatively low, but the event is clearly visible in the data. This would be a good one for multiple chords.“

The event will take place at an altitude of 30 deg and at azimuth 251 deg. The sun will be at an altitude of -60 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ±  0.15 path widths.
The probabilities to see a positive event:

Centre line: ~ 100 %
Path limits: ~  50 %
1 sigma lines:  ~16 %
2 sigma lines: ~ 2 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1229_9_13438.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081229_13438_Sites.txt

Good luck with your observation,

Oliver Klös

IOTA-ES

(9) Metis, 2008 Dec 29, Monday - Station Map

Dienstag, Februar 26th, 2008

Station Map for the Occultation by (1135) Colchis at Monday, 2008 December 29 (~ 20:57 UT)

V-Magnitude of target star 2UCAC 42390990: 12.6 mag

The max duration is expected to be 4.1 sec with a max drop of 1.5 mag.
The event will take place at an altitude of 57 deg and at azimuth 114 deg. The sun will be at an altitude of -51 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ±  1.73 path widths.
The probabilities to see a positive event:

Centre line: ~ 23 %
Path limits: ~  22 %
1 sigma lines:  ~10 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1229_1135_19730.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081229_19730_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(1135) Colchis, 2008 Dec 29, Station Map

Dienstag, Februar 26th, 2008

Station Map for the Occultation by (829) Academia at Monday, 2008 December 29 (~ 05:40 UT)

V-Magnitude of target star TYC 2447-00820-1: 12.1 mag
Johnson B-V Colour Index: + 0.3
The UCAC2 gives a „pseudo-R magnitude“ of  12.1 mag

The max duration is expected to be 4.0 sec with a max drop of 2.0 mag.
The event will take place at an altitude of 26 deg and at azimuth 297 deg. The sun will be at an altitude of -16 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ±  0.81 path widths.
The probabilities to see a positive event:

Centre line: ~ 46 %
Path limits: ~  39 %
1 sigma lines:  ~15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1229_829_13436.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081229_13436_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(829) Academia, 2008 Dec 29, Station Map

Freitag, Februar 22nd, 2008

Station Map for the Occultation by (1596) Itzigsohn at Tuesday, 2008 December 23 (~ 20:11 UT)

V-Magnitude of target star HIP 23642: 9.3 mag
Spectral type F5
Johnson B-V Colour Index: + 0.4
The UCAC2 gives a „pseudo-R magnitude“ of  9.2 mag

The max duration is expected to be 4.6 sec with a max drop of 4.7 mag.
The event will take place at an altitude of 45 deg and at azimuth 129 deg. The sun will be at an altitude of -41 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ±  0.61 path widths.
The probabilities to see a positive event:

Centre line: ~ 58 %
Path limits: ~  45 %
1 sigma lines:  ~15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1223_1596_13416.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081223_13416_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(1596) Itzigsohn, 2008 Dec 23, Station Map

Mittwoch, Februar 20th, 2008

Station Map for the Occultation by (192) Nausikaa at Monday, 2008 December 22 (~ 00:02 UT)

V-Magnitude of target star TYC 1409-00617-1: 11.4 mag
Johnson B-V Colour Index: + 0.1
The UCAC2 gives a „pseudo-R magnitude“ of  11.2 mag

The max duration is expected to be 24.0 sec with a max drop of 0.7 mag.
The event will take place at an altitude of 47 deg and at azimuth 113 deg. The sun will be at an altitude of -63 deg. (At predicted centre line for longitude E 09 deg)

There is a 1 sigma uncertainty interval of  ±  0.25 path widths.
The probabilities to see a positive event:

Centre line: ~ 96 %
Path limits: ~  50 %
1 sigma lines:  ~16 %
2 sigma lines: ~ 2 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1221_192_13409.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081221_13409_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(192) Nausikaa, 2008 Dec 22, Station Map

Mittwoch, Februar 20th, 2008

Station Map for the Occultation by (436) Patricia at Sunday, 2008 December 21 (~ 21:03 UT)

V-Magnitude of target star TYC 23407-03143-1 11.8 mag
Johnson B-V Colour Index: + 0.6
The UCAC2 gives a „pseudo-R magnitude“ of  11.6 mag

The max duration is expected to be 5.1 sec with a max drop of 3.0 mag.
The event will take place at an altitude of 50 deg and at azimuth 80 deg. The sun will be at an altitude of -48 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ±  0.76 path widths.
The probabilities to see a positive event:

Centre line: ~ 49 %
Path limits: ~  41 %
1 sigma lines:  ~15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1221_436_13408.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081221_13408_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(436) Patricia, 2008 Dec 21, Station Map

Dienstag, Februar 19th, 2008

Station Map for the Occultation by (1964) Walraven at Sunday, 2008 December 21 (~ 04:55 UT)

V-Magnitude of target star TYC 2401-00144-1: 10.4 mag
Johnson B-V Colour Index: + 0.5
The UCAC2 gives a „pseudo-R magnitude“ of  10.2 mag

The max duration is expected to be 1.5 sec with a max drop of 4.1 mag.
The event will take place at an altitude of 18 deg and at azimuth 306 deg. The sun will be at an altitude of -15 deg. (At predicted centre line for longitude E 20 deg)

There is a 1 sigma uncertainty interval of  ±  1.93 path widths.
The probabilities to see a positive event:

Centre line: ~ 20 %
Path limits: ~  20 %
1 sigma lines:  ~9 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1221_1946_14523.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081221_14523_Sites.txt

Good luck with your observation,

Oliver Klös

IOTA-ES

(1964) Walraven, 2008 Dec 21, Station Map

Dienstag, Februar 19th, 2008

Station Map for the Occultation by (312) Pierretta at Saturday, 2008 December 20 (~ 19:35 UT)

V-Magnitude of target star TYC 2397-00753-1: 12.0 mag
Johnson B-V Colour Index: + 0.2
The UCAC2 gives a „pseudo-R magnitude“ of  11.9 mag

The max duration is expected to be 3.4 sec with a max drop of 1.8 mag.
The event will take place at an altitude of 59 deg and at azimuth 94 deg. The sun will be at an altitude of -44 deg. (At predicted centre line for longitude E 15 deg)

There is a 1 sigma uncertainty interval of  ±  0.73 path widths.
The probabilities to see a positive event:

Centre line: ~ 51 %
Path limits: ~  41 %
1 sigma lines:  ~15 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1220_312_13402.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081220_13402_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(312) Pierretta, 2008 Dec 20, Station Map

Dienstag, Februar 19th, 2008

Station Map for the Occultation by (1251) Hedera at Friday 2008 December 19 (~ 21:58 UT)

V-Magnitude of target star TYC 1315-01390-1: 10.6 mag
Johnson B-V Colour Index: + 0.0
The UCAC2 gives a „pseudo-R magnitude“ of  10.5 mag

The max duration is expected to be 2.2 sec with a max drop of 3.5 mag.
The event will take place at an altitude of 51 deg and at azimuth 126 deg. The sun will be at an altitude of -61 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ±  1.34 path widths.
The probabilities to see a positive event:

Centre line: ~ 29 %
Path limits: ~  27 %
1 sigma lines:  ~12 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1219_1251_19705.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081219_19705_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(1251) Hedera, 2008 Dec 19, Station Map

Sonntag, Februar 17th, 2008

Station Maps  for the Occultation by (3092) Herodotus at Friday, 2008 December 19  (~03:14 UT)

 EAST and WEST

Trans-Atlantic-Event!
Path will cross Canada and the U.S.A. too.

V-Magnitude of target star HIP 36112: 9.2 mag
Spectral type K0
Johnson B-V Colour Index: + 0.9
The UCAC2 gives a „pseudo-R magnitude“ of  9.1 mag

The max duration is expected to be 2.7 sec with a max drop of 7.1 mag.
The event will take place at an altitude of  62 deg and at azimuth 261 deg. The sun will be at an altitude of -37 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ±  3.79 path widths.
The probabilities to see a positive event:

Centre line: ~ 11%
Path limits: ~  10 %
1 sigma lines:  ~6 %
2 sigma lines: ~ 1 %

(Calculation according to Raymond Dusser, E.A.O.N. Circular #10)

PLEASE REMEMBER: Predictions are sometimes wrong. Please observe even with a small probability.
Let other observers know about you observing plans: Announce you station with OccultWatcher !

More information (coordinates, finder charts) at Steve Preston’s prediction:
http://asteroidoccultation.com/2008_12/1219_3092_14742.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20081219_14742_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. (not updated with Steve Preston’s latest data):
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation,

Oliver Klös

IOTA-ES

(3092) Herodotus, 2008 Dec 19, Station Map EAST

(3092) Herodotus, 2008 Dec 19, Station Map WEST