IOTA-ES … Call for Observation

Station Map for the Occultation by (2617) Jiangxi at Wednesday, 2010 January 06 (~ 19:38 UT)

Magnitude of target star 2UCAC 43608980: 12.7 mag
UCAC instrumental “pseudo-R” fit-model magnitude: 12.9 mag (data from UCAC3)

The max duration is expected to be 4.7 sec with a max drop of 1.5 mag.
The event will take place at an altitude of  44 deg and at azimuth 83 deg. The sun will be at an altitude of -39 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 1.62 path widths.
The probabilities to see a positive event:

Centre line: ~  24 %
Path limits: ~  23 %
1 sigma lines:  ~ 11 %
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/2010_01/0106_2617_22878.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100106_22878_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (581) Tauntonia at Tuesday, 2010 January 05 (~ 04:02 UT)

Magnitude of target star 2UCAC 40003984: 12.7 mag
UCAC instrumental “pseudo-R” fit-model magnitude: 13.2 mag (data from UCAC3)

The max duration is expected to be 4.0 sec with a max drop of 1.4 mag.
The event will take place at an altitude of  38 deg and at azimuth 261 deg. The sun will be at an altitude of -39 deg. (At predicted centre line for latitude N 49 deg 51 min)

There is a 1 sigma uncertainty interval of  ± 0.85 path widths.
The probabilities to see a positive event:

Centre line: ~  44 %
Path limits: ~  38 %
1 sigma lines:  ~ 14 %
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/2010_01/0105_581_22869.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100105_22869_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (515) Athalia at Tuesday, 2010 January 05 (~ 22:00 UT)

V-Magnitude of target star TYC 1386-01139-1: 11.3 mag
Johnson B-V Colour Index: + 0.7
UCAC instrumental “pseudo-R” fit-model magnitude: 10.7 mag (data from UCAC3)

The max duration is expected to be 3.6 sec with a max drop of 3.9 mag.
The event will take place at an altitude of  44 deg and at azimuth 123 deg. The sun will be at an altitude of -55 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 1.11 path widths.
The probabilities to see a positive event:

Centre line: ~  35 %
Path limits: ~  31 %
1 sigma lines:  ~ 13 %
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/2010_01/0105_515_20476.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100105_20476_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (308) Polyxo at Monday, 2010 January 04 (~ 06:09 UT)

Magnitude of target star 2UCAC 26686366: 11.7 mag
UCAC instrumental “pseudo-R” fit-model magnitude: 11.9 mag (data from UCAC3)

The max duration is expected to be 4.4 sec with a max drop of 2.2 mag.
The event will take place at an altitude of  21 deg and at azimuth 159 deg. The sun will be at an altitude of -14 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.51 path widths.
The probabilities to see a positive event:

Centre line: ~  67 %
Path limits: ~  48 %
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/2010_01/0104_308_20473.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100104_20473_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (2617) Jiangxi at Sunday, 2010 January 03 (~ 23:08 UT)

V-Magnitude of target star TYC 2456-00375-1: 11.2 mag
Johnson B-V Colour Index: + 0.7
UCAC instrumental “pseudo-R” fit-model magnitude: 11.5 mag (data from UCAC3)

The max duration is expected to be 4.7 sec with a max drop of 2.8 mag.
The event will take place at an altitude of  70 deg and at azimuth 107 deg. The sun will be at an altitude of -67 deg. (At predicted centre line for longitude W 02 deg)

There is a 1 sigma uncertainty interval of  ± 1.31 path widths.
The probabilities to see a positive event:

Centre line: ~  30 %
Path limits: ~  28 %
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/2010_01/0103_2617_20471.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100103_20471_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver

IOTA-ES

Station Maps for the Occultation by (387) Aquitania at Sunday, 2010 January 03 (~ 20:44 UT)

SOUTH and NORTH

V-Magnitude of target star TYC 5276-00904-1: 10.7 mag
Johnson B-V Colour Index: + 0.5
UCAC instrumental “pseudo-R” fit-model magnitude: 10.6 mag (data from UCAC3)

The max duration is expected to be 5.3 sec with a max drop of 2.2 mag.
The event will take place at an altitude of  20 deg and at azimuth 222 deg. The sun will be at an altitude of -46 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 0.50 path widths.
The probabilities to see a positive event:

Centre line: ~  68 %
Path limits: ~  48 %
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/2010_01/0103_387_20470.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100103_20470_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Map for the Occultation by (2573) Hannu Olavi at Friday, 2010 January 01 (~ 23:14 UT)

V-Magnitude of target star TYC 2481-00790-1: 9.1 mag
UCAC instrumental “pseudo-R” fit-model magnitude:  8.5 mag (data from UCAC3)

The max duration is expected to be 1.4 sec with a max drop of 6.8 mag.
The event will take place at an altitude of  67 deg and at azimuth 108 deg. The sun will be at an altitude of -65 deg. (At predicted centre line for longitude E 05 deg)

There is a 1 sigma uncertainty interval of  ± 5.97 path widths.
The probabilities to see a positive event:

Centre line: ~  7 %
Path limits: ~  7 %
1 sigma lines:  ~ 4 %
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/2010_01/0101_2573_21887.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20100101_21887_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20January.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Maps for the Occultation by (599) Luisa at Tuesday, 2009 December 29 (~ 03:58 UT)

NORTH and SOUTH

V-Magnitude of target star HIP 26592: 6.6 mag
Spectral type K0
Johnson B-V Colour Index: +1.0
UCAC instrumental “pseudo-R” fit-model magnitude: 6.5 mag (data from UCAC3)

The max duration is expected to be 4.9 sec with a max drop of 6.4 mag.
The event will take place at an altitude of  34 deg and at azimuth 296 deg. The sun will be at an altitude of -31 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.42 path widths.
The probabilities to see a positive event:

Centre line: ~  77 %
Path limits: ~  49 %
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/2009_12/1229_599_18317.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20091229_18317_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Maps  for the Occultation by (539) Pamina at Saturday, 2009 December 19 (~ 00:24 UT)

(539) Pamina occults a double star!
TDS 3261
Sep 0.9 arcsec PA 182 deg in year 1991
Occultation component A: observable in Portugal, Spain, France and Italy.
Occultation component B: observable in U.K., Belgium, The Netherlands, Germany and Poland.

Component A:

V-Magnitude of target star TYC 1865-01349-1: 10.9 mag
The max duration is expected to be 4.8 sec with a max drop of 2.0 mag.

The event will take place at an altitude of  71 deg and at azimuth 209 deg. The sun will be at an altitude of -71 deg. (At predicted centre line for longitude 0 deg)

Component B:

V-Magnitude of target star TYC 1865-01349-2: 11.3 mag

The max duration is expected to be 4.8 sec with a max drop of 1.7 mag.
The event will take place at an altitude of  59 deg and at azimuth 217 deg. The sun will be at an altitude of -59 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.67 path widths.
The probabilities to see a positive event:

Centre line: ~  55 %
Path limits: ~  43 %
1 sigma lines:  ~ 15 %
2 sigma lines: ~ 1 %

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

Jean Lecacheux (IMCCE) wrote:

The UCAC instrument is unable to resolve the A and B stars.
So the UCAC2 provides the position and proper motion of a virtual photocentre located “somewhere between A and B”.
At the occultation date this photocentre W from the UCAC2 lies at the position :
05h 37m 30s.11966
+25d 05′ 05″.7532

Steve adopted the following star positions (see his detailed update) :

A component :   05h 37m 30s.1206   +25d 05′ 06″.125      

B component :  05h 37m 30s.1183    +25d 05′ 05″.225

… Steve affected to each star a weight proportional to its V luminosity measured by Tycho. That seems all right.

However I my opinion the position uncertainty of the two paths (A on Spain, B on England) may be slightly underestimated in Steve’s update, for the two following reasons.

1/ Nothing warrants us that the A and B stars have a full negligible  relative motion in a 19 years interval.

2/ Nothing warrants us that the A and B stars have the same colour.


SO PLEASE OBSERVE OUTSIDE THE 2 SIGMA LINES TOO!

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/2009_12/1219_539_18275.htm

http://asteroidoccultation.com/2009_12/1219_539_18276.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20091219_18275_Sites.txt

http://www.poyntsource.com/New/Google/20091219_18276_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation!

Oliver Klös

IOTA-ES

Station Maps for the Occultation by (541) Deborah at Friday, 2009 December 18 (~ 19:46 UT)

WEST and EAST

V-Magnitude of target star TYC 1813-01183-1: 11.3 mag
Johnson B-V Colour Index: +0.6
UCAC instrumental “pseudo-R” fit-model magnitude: 11.2 mag (data from UCAC3)

The max duration is expected to be 5.1 sec with a max drop of 3.3 mag.
The event will take place at an altitude of  56 deg and at azimuth 133 deg. The sun will be at an altitude of -42 deg. (At predicted centre line for longitude E 10 deg)

There is a 1 sigma uncertainty interval of  ± 0.62 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/2009_12/1218_541_18273.htm

Table of potential observing stations and cities with distance from center of predicted path (Derek C. Breit):
http://www.poyntsource.com/New/Google/20091218_18273_Sites.txt

Map and Coordinates at the web page of  E.A.O.N. :
http://astrosurf.com/eaon/Occultations%20December.htm

Good luck with your observation!

Oliver Klös

IOTA-ES