Huya 18/03/2019
Observation tips:
- Shadow moves from **South to North**;
- 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 00:35 to 01:00 Universal Time. Huya has a satellite with unknown orbit, it can be up to four minutes ahead or behind the main body. So please observe 10 minutes around the prediction time of your site.
After the observation, please fill the form available on this link (form), and send it to ribas(at)on.br.
| Star J2000 coordinates: |
|
RA 16 41 06.4260 DEC -06 43 34.575 |
| Day coordinates of the object: |
| RA 16 42 07.7004 DEC -06 45 44.689 |
| Star G mag | 11.5 |
| Star R mag | 11.1 |
| Magnitude drop in R | 8.0 |
| Maximum
duration |
56
sec |
| Moon
| 86% illum. |
@
114 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.
Prediction Updates
Prediction from Lucky Star web page (i).
With observations on the begining of March, from Sirra Nevada Observatory, J.L. Ortiz obtained the following last-minute prediction
KMZ file
Zoom
New NIMA version taking into account Huya's positions form Pico dos Dias and Sierra Nevada Observatories (ii).
Please, see the observation tips at the top!