Amycus 14/06/2018

*Prediction based on Gaia DR2*
2018-06-14_Amycus/2018-06-14-21h37m00s_Amycus_GDR1_NIMAv2.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 21:30 to 21:40 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  19 03 28.222
DEC  -30 20 05.042
Day coordinates of the object:
RA  19 04 39.148
DEC  -30 18 15.475


Star V mag 16.060
Star R mag 14.160
Star G mag 14.191
Star K mag 11.872
Magnitude drop in R 6.8
Maximum duration
5 sec
Moon | 2% illum.
@ 168 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)
2018-06-14_Amycus/FOV_5x5_20180614Amycus.jpeg

 
20
x 20 arcmin FOV (North is up, East is left)
2018-06-14_Amycus/FOV_20x20_20180614Amycus.jpeg




Prediction

Prediction from Lucky Star web page (i).
2018-06-14_Amycus/2018-06-14_21h37m03s_Amycus_GAIADR2pmGAIADR2_NIMAv2.png

(i) http://lesia.obspm.fr/lucky-star/predictions/single.php?p=5696

Please, see the observation tips at the top!