Ixion  10/06/2018

*Prediction based on Gaia DR2*
2018-06-10-00.285_DR2_NIMAaug17_Ixion.jpg


Observation tips:

- Shadow moves from **East to West**;

- The nominal occultation time on the map, corresponds to the big red dot, the closest approach
.
- Each red dot is separated by one minute;
- Dark gray is night and light gray is astronomical twilight (Sun at less than 18 deg below the horizon);
- *Absolute time accuracy is essential** (see important note below);

- Observations are requested from 00:15 to 00:25 Universal Time.   

After the observation, please fill the form available on this link (form), and send it to ribas(at)on.br.

Useful information:
Star J2000 coordinates:
  RA  17 42 57.7018
DEC  -28 48 20.889
Day coordinates of the object:
RA  17 44 08.3634
DEC  -28 48 41.118


Star G mag 16.1
Star BP mag 16.9
Star RP mag 15.2
Star K mag 12.8
Magnitude drop in R 3.5
Maximum duration
25 sec
Moon | 19% illum.
@ 120 deg

Important note
:

*Absolute time accuracy is essential**

to connect all the observations
together after the fact. Check the time of your computer with many sources (phone talked hour, different internet sites, ideally with a GPS). Its advised to check the registered time right after and right before the integrations, so if there is a drift, we can correct it by having the difference.

Beware of the dead time between the images: if you manage an exposure time of 1 sec (for example), but have your camera takes 2 sec to read the image, then there is a 67% chance that you miss the dis(re)-appearance of the star. So it's better to have, for example, a 4 sec integration, so you have 67% chance to get the occultation in one of your exposures.



Finding charts from DSS:
  05 x 05 arcmin FOV (North is up, East is left)
2018-06-10_Ixion/FOV_5x5_20180610Ixion.jpeg

 
20
x 20 arcmin FOV (North is up, East is left)
2018-06-10_Ixion/FOV_20x20_20180610Ixion.jpeg_20x20_201805262002MS4.jpeg




Prediction

Prediction from Lucky Star web page (i).
2018-06-10_Ixion/2018-06-10_00h17m06s_Ixion_GAIADR2pmGAIADR2_NIMAv5.png

(i) http://lesia.obspm.fr/lucky-star/predictions/single.php?p=6777

Please, see the observation tips at the top!