Betelgeuse - (319) Leona
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The Occultation of Betelgeuse by (319) Leona on 2023 Dec 12


On 2023 Dec 11/12 the bright naked-eye star Betelgeuse (α Ori) will be occulted by the main-belt asteroid (319) Leona. The occultation path of this transatlantic event starts in eastern China, then crosses Tajikistan, Turkmenistan, Azerbaijan, Armenia, Turkey, Greece, Italy, Spain, Portugal, the southern tip of Florida and finally ends in Mexico. Because the apparent size of the asteroid will likely be smaller than the angular diameter of the star in visible light (~50 mas), this will result in an annular (and/or partial) occultation which is different from the usual (total) asteroidal occultation and will give a big community of pro/am observers a unique opportunity to study this star in detail with small instruments.

Be aware that the occultation will happen in the night Dec 11 -> 12 (Monday -> Tuesday) !

Some selected mid-occultation times are:
Turkey (Ankara) : ~01:11.3 UT,
Greece (Ioannina) : ~01:12.5 UT,
Italy : ~01:13 UT,
Spain (Jaen) : ~01:15.5 UT
Florida : ~ 01:24.9 UT 

CORA prediction(s): 



Observing Guides

We provide comprehensive observing guidelines and tips in EnglishSpanish and Turkish.

A video (in Spanish with subtitles in different languages) created by our colleague René Duffard (IAA) provides also observing instructions.



The official spanish weather forecast for the Andalucia region is provided by AEMET. Other recommended services are: YR, Meteoblue.

We provide also a Google Earth Overlay (kmz) with night time cloud cover statitistics in the last 20 years from satellite data for the month of december. The contour plots indicate cloud cover fraction from 0 to 1. The smallest cloud cover values are around 0.3 (corresponding to 30% of cloud cover in the whole month). The worst cloud cover fraction is in blue color and the best in brown and red. Below a screenshot (here in higher resolution).


Reporting your observations

Once the data has been taken, contact your local coordinator to send them the data by WeTransfer, Dropbox, Google Drive, or a similar online service.


Web resources

Below are some websites that are general or specifically dedicated to the occultation of Betelgeuse and are therefore recommended to visit.
Of course, this list does not claim to be complete.

Predictions by the CORA project.

Predictions by the Lucky Star project.

The OWC project provides occultation predictions made with Occult by different computers.

Spanish Citizen Science Project. The website has a nice online simulator.

Spanish Discord Occultation Channel, Ocultaas. Discord account required.

French pro-am collaboration, Gemini.

Turkish event website by Y. Kilic.

Webpages by B. Gährken.

Event webpage by IOTA/ES.

German Astronomical Association, VdS.

Italian Astronomical Association, AstroCampania ETS.

ESOP42 presentation by M. Montargès.

ESOP42 presentation by A. Noschese.

ESOP42 presentation by W. Beisker.

IAA-CSIC press release (2023-12-05).



Ortiz, J. L. et al., 2023, The stellar occultation by (319) Leona on 13 September 2023 in preparation for the occultation of Betelgeuse ::

Kretlow, M. et al., 2023, The Occultation of Betelgeuse by (319) Leona on 2023 Dec 12 :: JOA 2023-4

Schnabel, C., 2023, Practical Advice for the Occultation of Betelgeuse by (319) Leona :: JOA 2023-4



IAA-CSIC - CORA - SODIS - OccultationPortal

 J. L. Ortiz & M. Kretlow, IAA Granada

Last edited: December 08, 2023, 15:44

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