Asteroid Program

Check our dedicated page to learn more about asteroid occultations which could be detected with an eVscope, take a look at when, where and how you could contribute to a better knowledge of asteroids.

Unistellar is also launching at the same time a beta Planetary Defense program, check the dedicated section to get an idea of how you could participate.

Are you willing to contribute to citizen science with your eVscope for one of these campaigns? Please send us an email at

What’s new: SETILive with Ed Lu!!

Join the SETI Institute for a special #SETILive about Planetary Defense with American physicist and former NASA astronaut, Ed Lu. Ed will share his first-hand experience with a Unistellar eVscope and talk citizen science.


When and where ?

Will an occultation be observable nearby you ? Yes if you are nearby a red line, possibly if you are between the orange line.

Maps of the week in Europe

- 1999TU247 map (Night of 17/18, July 2020) -
- 2002FX3 map (Night of 18/19, July 2020) -
- 24749 Grebel map (Night of 22/23, July 2020) -
- 12158 Tape map (Night of 24/25, July 2020) -
- 1999NB65 map (Night of 29/30, July 2020) -

Citizen Astronomy's Asteroid Program: Week 2 July Program in Europe

Asteroid NameDateOccultation TimeAltDirectionConstellationWhere to Observe It?
1999TU247Night of 17/18, July 202001:30 CEST45°SEAquilaSouth of France, Italy, Austria
2002FX3Night of 18/19, July 202002:10 CEST25°SOOphiucusNorth of France, Belgium, Germany, Netherlands
24749 GrebelNight of 22/23, July 202002:27 CEST45°SAquilaNorth of France, Belgium, Germany, Netherlands...
12158 TapeNight of 24/25, July 202003:05 CEST25°E/SEPiscesNorth of France, Belgium, Germany, Netherlands...
1999NB65Night of 29/30, July 202000:50 CEST20°SOSerpensNorth of France, Belgium, Sweden...
Asteroid NameRADecExposition TimeGainDuration
1999TU247 20h 37m 50s -00° 12' 51"150 ms55 dB04m00s
2002FX3 17h 07m 27s +02° 28' 57"150 ms50 dB03m00s
24749 Grebel 19h 57m 54s +07° 30' 19"200 ms45 dB03m00s
12158 Tape 01h 29m 21s +10° 08' 11"150 ms50 dB04m00s
1999NB65 17h 33m 43s -15° 42' 48"200 ms50 dB02m00s

Maps of the week in USA

- 2494 Inge map (night of 15/16, July 2020) -
- 165 Loreley map (night of 20/21, July 2020) -
- 6135 Billowen map (night of 30/31, July 2020) -

Citizen Astronomy's Asteroid Month: June Program in North America

Asteroid NameDateTime Launch (EDT)Time Launch (CDT)Time Launch (MDT)Time launch (PDT)Where to observe it?
2494 IngeNight of 15/16, July 202002:18 EDT01:20 CDT00:21 MDT23:22 PDTUSA
165 LoreleyNight of 20/21, July 202004:12 EDT03:12 CDT02:12 MDT01:12 PDTUSA
6135 BillowenNight of 30, July 202000:45 EDT23:47 CDT22:49 MDT21:50 PDTUSA

Asteroid NameRADecExposition TimeGainDuration
2494 Inge17h 56m 44s-25° 17m 13s500 ms45 dB03m00s
165 Loreley21h 58m 57s-07° 16m 10s500 ms50 dB10m00s
6135 Billowen19h 45m 20s-18° 09m 37s150 ms55 dB03m00s


  • What is an occultation ?

It is an astronomical event defined by the passage of an asteroid in front of a star. The latter is then completely or partially masked.

  • Why observe them?

To participate in scientific missions that study the asteroids around us and perhaps help discover the origins of life!

  • “What a Feeling”: A Testimonial from an Occultation’s Detector

Here is what Morand, one of Unistellar’s first citizen astronomers, wrote about his detection of asteroid 2000 UD52:

“When I received this occultation “mission”, I was a little confused. It seemed quite simple, the event was known, so no chance discovery by amateurs … But hey, I played the game. I had just received the telescope.

Excited but a little late as always, I followed the procedure and … I saw nothing … However, I sent the data. And, a few days later, I learned that the occultation was clearly visible on the data, that I was the only Unistellar to have observed it, and that the scientific value was real : the occultation was very brief, 0.3s (the predicted maximum was 0.8s), therefore particularly difficult considering the small size of the asteroid (~ 6.6 km) and the width of its centrality band.

Having observers near and into the centrality band will allow to better determine the position of the asteroid, and therefore to refine its orbit ! What a feeling !”

  • How to observe them?

Check this complete howto guide on how to catch one with your Unistellar eVscope


Check here Unistellar’s next citizen science campaigns in Europe and North America, and take a look at previous campaigns.


Detections and observations of asteroid occultations coming from the Unistellar network are published on the Euraster website:

– Detection confimed for asteroid 2000 UD52

– Observation of asteroid 2011 KT19

– Observation of asteroid Cebriones

Planetary Defense Program (beta)