We are contacting you today to participate in a citizen science campaign in the night between Saturday, June 6th to Sunday June 7th. 1632 Siebohme asteroid is a main-belt asteroid discovered in 1941 by the German astronomer Karl Wilhelm Reinmuth. This asteroid will occult a 11.4 magnitude star and this event is visible from your area.
By observing and possibly detecting the occultation, you will have contributed to a better knowledge of outer space. It may for example be possible to get a better understanding of Siebohme trajectory and shape, or even to find out about its rings or moons.
Observing an asteroid occulting a star is a difficult task, with no guaranteed success. Keep in mind that, whether or not your eVscope detects the occultation, both positive and negative results will provide useful information for scientists from Unistellar and the SETI Institute, our science partner.
The observing campaign will happen in the night from Saturday 6th to Sunday 7th between 00:25 to 00:28 EDT
Thanks to the power of your eVscope you may be able to observe it from anywhere, even from downtown. If you can look up toward the East/Southwest direction at approximately 30°degrees of altitude (constellation of Scorpius), you will be able to observe the star being occulted for up to 2 seconds.
If you wish to contribute, please check the instructions below to observe this celestial event. Please make sure you read them before, it will ensure your observation runs smoothly.
Taking part in Citizen Science campaigns
⚠️ Detailed documentation : You may want to check first this complete user manual to occultations
Before the occultation
✔️ Check the weather
We suggest you use the clearoutside app or website.
(see p.13 in the User Manual link)
✔️Empty the memory of your eVscope
WARNING : this step can take up to 30 minutes – 2h depending on your Internet connection.
(p.7 in the User Manual link)
✔️Charge the battery of your eVscope
✔️Look for updates of the Unistellar application (Apple and Android stores).
At 23:20 EDT (or sooner if you are novice) :
✔️Check the accuracy of the time on your phone
Use the Time.is website : https://time.is/
(see p.9 in the User Manual link)
✔️Install your eVscope
Turn it on, connect it to your phone and you are ready to start !
(see p.16 in the User Manual link)
✔️Launch Autonomous Field Detection
So that your eVscope knows precisely how to go to the occulted star.
(see p.18 in the User Manual link)
By pointing one of the first stars recommended by the app and using the Bahtinov Mask.
(see p.23 in the User Manual link)
✔️Optional step : collimation
If your stars look like “potatoes” and have elongated shape, you need to collimate your mirror.
Check then this article from our FAQ : https://unistellaroptics.zendesk.com/hc/en-us/articles/360002267334-Collimation
(see p.21 in the User Manual link)
At 00:10 EDT
✔️Go to the star
In the “Science” tab on the app, click on “Asteroid occultation”.
In “Target”, put the star’s coordinates :
RA : 16h 21m 02s
DEC : -14° 04m 43s
BE CAREFUL : Here for DEC : click on “-” then on “1” and “4”.
⚠️ Don’t forget the “-” ! ⚠️
Check your values one more time.
Then, click on “GoTo”. Your eVscope is now pointing at the star soon to be occulted.
You can come back on the “eVscope” tab during the “GoTo” if you want to see the star.
At 00:22 EDT
In the “recording” tab enter the next information.
Gain : 50 dB
Exposure time : 120ms
Time duration : 03m00s
Check again your values and click on “Launch” at 00:25 EDT
Remark : Once recording has started, please stay on the “Asteroid occultation” page where an orange circle is rotating (indicating recording is in progress).
🏡 Once at home :
✔️Transfer your data
Once recording is over, please transfer your data. (If you need help please check : https://help.unistellar.com/hc/en-us/articles/360013803619-eVscope-Data-Storage-Memory-Downloading-and-Uploading-Data )
✔Tell Unistellar that you participated
To make sure your contribution is properly processed, please fill this very short survey by telling us your name, the serial number of your eVscope and if you agree your name can be mentioned in the EURASTER report on their website (keep in mind that, to prove the accuracy of your observation, its GPS coordinates will be published too).
By filling this survey : https://www.surveymonkey.com/r/9SBNK27
⚠️ Please, fill this survey, we can only process data registered that way ⚠️
🥂 Congratulations ! 🥂
You have achieved your citizen science mission. Unistellar and SETI Institute scientists thank you and hope you enjoyed it.
We will publish the occultation results soon on EURASTER and on our website.
It is a small step for you, and a big step for citizen science.
If you need help or if you have any questions or remarks, don’t hesitate to contact us by e-mail : firstname.lastname@example.org