Event predictions

This page presents a selection of "best" events.  These are also available through the Occultation Portal. 

Please check Occult Watcher Cloud, for details and updates, in the specific feed of the ACROSS campaign.

Here below you can find predictions for events by:

• The asteroid (65 803) Didymos. This is the main target of ACROSS, and the target of the DART/Hera first planetary defence missions.
•  The 9 potential secondary targets of Hera (ESA) in the next 5 years: (29 886) Randytung, (42 532) 1995 OR, (54 212) 2000 HJ89, (88 992)  2001 TJ72, (95 802) Francismuir, (122 764) 2000 SX69, (169 549) 2002 EG105, (188  708) 2005 TR99 and (477 416) 2009 WW1. 

• NEAs with orbits that allow predictions with a decent probability of success, with a list of about 30 NEAs chosen according to their orbital quality (σ_a < 1e-9 au), size (D > 0.5 km) and presence in the Gaia DR3 database.

For each group, a table and images are published for the most accessible events in the following two months, and files with the full list of predicted events in XML format (produced by Occult) are shared at the end. It should be noted that, due to the low number of restrictions we apply in the XML files, they may have more than 20 000 events, in particular the general NEA files. 20 000 is the standard limit of events for Occult, as it claims that the processes involving a larger amount of events can slow down significantly. However, it is possible to raise this limit up to 100 000, the maximum Occult allows. To do that, it is necessary to enter the "Maintenance" section, choose "User Settings", go to "11. Asteroid occultations - Search and Display", where you can edit the limit. If necessary, the team can also provide smaller files upon request, for those who choose to keep this limit.

By accessible, we mean events with:

- Star Magnitude (Mv) <= 14.0;

- Maximum Duration (s) >= 0.2 (for the general NEA only);

- Path crosses significant amount of landmass on Earth's surface (not just oceans);

- Solar Elongation >= 45º;

- For the more general NEA events only, whether the path uncertainty is less than 5x the object's Diameter.

The tables have the essential information of each event: date, target asteroid's permanent number and name, target star's catalogue name and number, RA/Dec coordinates and Mv magnitude, and quantities related to the event, such as expected drop (in magnitudes), maximum duration (in seconds) and the general area of the globe where the event is visible. Also contained the Occu;t Map for every event. For the most promising Didymos events (red lines) and when requested by observers, the last column holds the .kmz file of the event with the predicted path and the topographic corrections applied.   

IMPORTANT: The .xml tables are only propagated once for the whole month for simplicity, while all the events displayed here and in OWC have been propagated to the date of occultation. So the maps in the xml and these images may not match perfectly. If you are insterested in observing an event not included in OWC or this website, please contact the ACROSS team, in order to have access to the most precise map we can get for it.

Interesting events in the near future

Didymos

 There are not any viable events by (65803) Didymos at the moment.  

Other Didymos events  for June-July in  XML format for Occult ( ~300 in total).

See dedicated page for the event on January 21-22, 2023 !

Potential Hera secondary Targets

 There are not any worth mentioning events by the potential Hera targets at the moment.

Other Hera events  for June-July in  XML format for Occult ( ~400 in total).

Other NEAs

Date	Asteroid		Star		RA			Dec			Conditions			Zone	Image
	Number	Name	Catalogue	Number	h	m	s	d	m	s	Mv	Drop	Duration
10/01/2025	2100	Ra-Shalom	UCAC4	354-181178	19	47	24	-19	19	45	12.4	4.5	0.37	Australia
10/01/2025	3200	Phaethon	UCAC4	665-020793	3	52	47	42	57	29	13.5	4.7	0.35	Japan
10/02/2025	2100	Ra-Shalom	UCAC4	352-177044	19	48	42	-19	41	32	13.1	3.9	0.37	Australia
10/02/2025	2100	Ra-Shalom	UCAC4	351-182513	19	49	13	-19	50	24	12.2	4.7	0.37	Europe
10/02/2025	16	Psyche	UCAC4	547-014733	5	23	30	19	20	40	11.0	0.7	31.93	Europe
10/04/2025	2100	Ra-Shalom	UCAC4	348-184884	19	51	37	-20	27	3	11.7	5.3	0.37	Japan
10/09/2025	3200	Phaethon	UCAC4	667-019258	3	39	28	43	15	1	12.4	5.6	0.29	Europe
10/18/2025	2100	Ra-Shalom	UCAC4	329-194562	20	13	41	-24	12	25	13.5	4.0	0.34	North America
10/24/2025	3200	Phaethon	UCAC4	663-014308	3	1	20	42	33	25	13.3	4.4	0.22	Europe
11/07/2025	3200	Phaethon	UCAC4	651-009158	2	24	7	40	4	8	12.8	4.7	0.21	Europe
11/08/2025	16	Psyche	UCAC4	544-014477	5	23	47	18	36	0	13.7	0.0	37.81	Japan
11/11/2025	16	Psyche	UCAC4	543-014762	5	22	29	18	32	44	11.9	0.2	34.11	South America
11/15/2025	16	Psyche	UCAC4	543-014308	5	19	49	18	26	51	14.3	0.0	29.45	North America
11/16/2025	16	Psyche	UCAC4	543-014189	5	19	0	18	25	22	13.9	0.0	28.47	Australia
11/20/2025	2100	Ra-Shalom	UCAC4	314-247366	21	18	20	-27	19	2	12.7	5.3	0.25	Australia
11/20/2025	3200	Phaethon	TYC	2319-00685-1	1	53	36	36	25	22	11.4	6.2	0.22	Europe
11/21/2025	3200	Phaethon	UCAC4	632-006130	1	52	16	36	13	12	12.4	5.2	0.22	North America

Other NEA targets' events for June-Julyin XML format for Occult (>10000 in total, caution with Occult limit!).