Call for Observation
On 28th of January 2018, around 21h55min UTC, the TNO 2002TC302 occults a 15m8 star. This is a relatively easy to observe event, because of the low speed of the TNO relative to the star of only about 5km/sec. Give it a try! Even instruments with less than 30 cm diameter should do it. And you don't need a high speed camera for this slow event. With 1 or 2 seconds exposure time you can do valuable science! A new update of the prediction has been issued by J. Desmars. Have a look!.
2002TC302 Occults UCAC4-593-005847 (15m8)
for Europe. New astrometric update!
(8) Flora occults TYC 1341-00957-1 on 2018 Jan 13
A campaign has been set up for this event. Have a look!
>>> Haumea, the most peculiar of Pluto companions, has a ring! <<<
From a press release of the Instituto de Astrofisica de Andalucia (IAA-CSIC)
The trans-neptunian belt contains four dwarf planets, among which Haumea stands out for its extremely elongated shape and rapid rotation.
A stellar occultation revealed the main physical characteristics of this heretofore poorly known body – among which the most surprising presence of a ring.
Researchers around Jose-Luis Ortiz and Pablo Santos-Sanz published a paper in Nature, that showed a ring around Haumea. This is the first trans-Neptunian object with a ring.
"One of the most interesting and unexpected findings was the discovery of a ring around Haumea. Until a few years ago we only knew of the existence of rings around the giant planets; then, recently, our team discovered that two small bodies situated between Jupiter and Neptune, belonging to a group called centaurs, have dense rings around them, which came as a big surprise. Now we have discovered that bodies even farther away than the centaurs, bigger and with very different general characteristics, can also have rings,” says Pablo Santos-Sanz, a member of the IAA-CSIC team. Also members of IOTA-ES, professionals and amateurs as well, contributed to this research. It has been published by
J. L. Ortiz et al. "The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation". Nature, (2017) DOI: 10.1038/nature24051
Transcontinental Occultation of a 12m4 star UCAC4 410-143659
Many stations throughout Europe have recorded the event with telescope of different sizes ranging from 20cm to more than 1 meter diameter.
An example of the central flash recorded near the central line in Elvas, Portugal is shown in the following picture. It as been taken with a 27cm telescope and a 12 bit digital CCD camera.
A very preliminary lightcurve shows the occultation with the central flash. Exposure time 0.3 seconds. No filter. Copyright W. Beisker, IOTA-ES, 2017
by Triton on the 5th/6th of Oct 2017 around 23h50 UTC.
Visible from USA and large parts of Europe
The updates of the predictions of this campaign can be
Predictions for 55 TNOs and Centaurs for 2017 and 2018
In the frame of the European-funded Lucky Star project, a webpage with predictions of occultations in 2017 and 2018 for 55 TNOs and Centaurs had been developed by Josselin Desmars from Bruno Sicardy's team. Occultations can be selected by date, magnitude range and name of the occultation object.
Have a look!!
Successful observation of a Chariklo occultaton in Namibia with the 0.5m portable instrument m2.
On the 9th of April the m2 instrument was used by IOTA-ES member Mike Kretlow as part of an international campaign in cooperation with the EU research project LuckyStar to observe the occultation of UCAC4-294-211208 (14m) by Chariklo in Namibia. Despite poor weather situation, the occultation could be recorded using a Raptor camera with 0.08 sec exposure time. This was the first "Out of Europe" use of m2.
More positive observations came from a IOTA-ES member (Karl-Ludwig Bath) observing at the IAS observatory (Hakos). One more station operated by Jean-Luc Dauvergne was successful too.
3 out of 6 deployed stations got data, the other failed due to unfavorable weather conditions.
A very preliminary lightcurve shows the central body near its maximal diameter and the rings of Chariklo as well.
Inauguration of IOTA-ES 0.5m portable telescope.
On the 8th of October an inauguration party has been held at the Archenhold observatory in Berlin. Members of IOTA-ES including the board of directors celebrated the inauguration with champagne and sausages.
It has been named "m2"
The first real observation with the instrument had been the successful observation of the occultation by Pluto on the 19th of July 2016. It will still take some more time, to finish some minor work and to write the operation instructions. But in the near future it can be booked by IOTA members for observation projects. Read more!!
For IOTA members:
Grazing Occultations of stars by the moon are local events and thus require an individual selection according to personal observation preferences. The GRAZPREP-software assists in all aspects of finding individually interesting events as well as selecting the best observing stations promising the most contacts between the star and the lunar limb in high resolution. GRAZPREP can be downloaded and installed, including a step by step operation tutorial. Go to the Members login part of the website!
GRAZPREP-software: Find and prepare Grazing Occultations in detail
Minor Planet Occultations of Bright Stars
Occultations by stars brighter than about 9th mag will be presented in this blog.http://call4obs.iota-es.de
Grazing Occultations of Stars by the Moon
A field of professional astronomy between science and beauty
Among all occultation phenomena in the sky grazing occultations of stars by the moon have a very unique character. The observation of these spectacular events ... read the overview in full length!
For Occultwatcher Users
European Feed for Lunar Occultations of Double Stars
There is a "Lunar Occultations Add-in" for "OccultWatcher" ready for download to get in OW interesting lunar occultations of double and suspected double stars. Read more..
Asteroid TU24 recorded from Munich around 1h 10min UT on 30th Jan 2008. Fast motion (5x). Near miss of 11m9 star TYC 4140-520
EU-Project EUROPLANET creates a database for professional and amateur observatories!. Have a look to their questionaire! Read more...
Information about running TNO campaigns
Information about running campaigns for TNO occultations you can find here at Felipe Braga-Ribas website. Follow up the prediction process and get ready to observe if it is in your area!
The XXXVI European Symposion on Occultation Projects will be held in Freiberg, Germany on the 15th to 17th of September 2017.
Have a look!!
The Journal for Occultation Astronomy is now free for all, except the last 2 issues.
Get it for free!
Call for Observations!
Occultations of Bright Stars by Minor Planets can be found HERE
Reporting lunar occultations
The most significant change for 27 years in reporting lunar occultations is now underway. You have to know, how to report lunar occultations from now on! Your reports have to be sent to a new mailing address.
Dave Herald reports from Canberra, Australia
Iota Occultation Camera (IOC)
How many photons do you get from a star?
GPS ... Where am I ?
Positionsbestimmung mit GPS und Karte... in German Read more...
The Artificial Night Sky Brightness for Occultation Observing Stations in Europe