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.
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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.

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

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

Date	Star		RA			Dec			Conditions			Zone	Map
Date	Catalogue	Number	h	m	s	d	m	s	Mv	Drop	Duration	Zone	Map
6/13/2023	UCAC4	524-050792	10	7	44	14	47	28	15	7.3	0.03	Africa
6/22/2023	UCAC4	517-051122	10	22	45	13	14	10	15	7.7	0.03	Asia
6/29/2023	UCAC4	511-050451	10	34	7	12	1	45	15	7.8	0.02	South Asia
7/5/2023	UCAC4	505-053058	10	44	10	10	56	33	13	10.3	0.02	South Asia
7/9/2023	UCAC4	501-054891	10	51	30	10	8	14	14	9.3	0.02	Africa

Didymos Events for May and June in XML format for Occult (~30 in total).

Potential Hera secondary Targets

Date	Asteroid		Star		RA			Dec			Conditions			Zone	Map
Date	Number	Name	Catalogue	Number	h	m	s	d	m	s	Mv	Drop	Duration	Zone	Map
6/4/2023	42,532	1995 OR	UCAC4	493-000480	0	24	7	-2	23	6	14	5.5	0.09	New Zealand
6/5/2023	95,802	Francismuir	UCAC4	501-002506	1	42	41	10	7	28	13	6.9	0.06	South America
6/14/2023	477,416	2009 WW1	UCAC4	388-146156	22	10	22	-12	32	30	13	10.2	0.19	South Asia
6/16/2023	477,416	2009 WW1	UCAC4	388-146173	22	10	54	-12	31	18	15	7.5	0.21	Australia
6/24/2023	42,532	1995 OR	UCAC4	458-001445	1	4	54	1	30	33	14	5	0.11	Australia
6/28/2023	169,549	2002 EG105	UCAC4	314-245041	20	37	7	-27	13	32	14	6.7	0.2	Africa
7/2/2023	169,549	2002 EG105	UCAC4	312-252787	20	34	5	-27	38	1	14	5.8	0.18	North America
7/2/2023	477,416	2009 WW1	UCAC4	387-144956	22	12	19	-12	41	13	13	9.8	0.41	Australia
7/9/2023	169,549	2002 EG105	UCAC4	309-258853	20	27	49	-28	19	49	12	7.5	0.16	North America
7/15/2023	95,802	Francismuir	G	025629.8+160618	2	56	30	16	6	18	11	1	0.08	Europe
7/15/2023	169,549	2002 EG105	TYC	6918-00086-1	20	21	12	-28	55	38	12	8.1	0.15	Australia
7/24/2023	29,886	Randytung	UCAC4	415-145521	22	38	35	-7	11	46	14	5.5	0.47	Australia
7/27/2023	88,992	2001 TJ72	UCAC4	529-005128	3	0	25	15	44	2	13	7.8	0.07	North America
7/30/2023	42,532	1995 OR	UCAC4	485-002983	2	6	52	6	51	35	12	6.8	0.18	Australia
7/31/2023	42,532	1995 OR	UCAC4	485-003010	2	7	56	6	56	32	15	3.7	0.18	North America

OtherHera targets' events for May and June in XML format for Occult ( ~300 in total).

Other NEAs

Date	Asteroid		Star		RA			Dec			Conditions			Zone	Map
Date	Number	Name	Catalogue	Number	h	m	s	d	m	s	Mv	Drop	Duration	Zone	Map
6/1/2023	1,685	Toro	UCAC4	297-102002	16	53	47	-30	45	42	14	2.1	0.33	North America
6/1/2023	1,685	Toro	HIP	82570	16	52	44	-30	41	43	8.6	6.9	0.33	SouthEast Asia
6/1/2023	175,706	1999 FG3	UCAC4	500-054674	9	44	47	9	50	60	14	5.3	0.12	Europe
6/2/2023	66,391	Moshup	UCAC4	460-027445	7	2	23	1	49	58	11	7.1	0.04	Australia
6/6/2023	186,844	2004 GA1	TYC	5520-00412-1	11	52	30	-10	23	38	11	6.1	0.15	South America
6/7/2023	137,170	1999 HF1	UCAC4	570-003539	1	39	58	23	48	6	12	4.3	0.1	Europe
6/8/2023	66,391	Moshup	UCAC4	455-041479	7	56	5	0	53	14	11	1	0.04	Australia
6/11/2023	1,685	Toro	UCAC4	305-093042	16	30	43	-29	4	35	13	2.1	0.32	South America
6/14/2023	175,706	1999 FG3	TYC	829-00550-1	10	1	56	8	39	56	11	8.6	0.13	Japan
6/16/2023	1,627	Ivar	UCAC4	510-054593	12	34	18	11	54	58	15	0.8	1.05	Australia
6/20/2023	66,391	Moshup	TYC	235-02200-1	9	38	16	0	14	19	11	6.9	0.05	North America
6/21/2023	186,844	2004 GA1	UCAC4	448-052933	11	25	29	0	##	18	13	5.1	0.14	Japan
6/21/2023	1,685	Toro	UCAC4	317-083700	16	7	10	-26	42	56	15	1.3	0.34	Australia
6/21/2023	137,170	1999 HF1	UCAC4	555-006721	3	23	19	20	58	14	7.2	9.1	0.09	Australia
6/22/2023	1,685	Toro	UCAC4	318-085511	16	5	54	-26	34	4	14	2	0.34	North America
6/23/2023	175,706	1999 FG3	UCAC4	490-05294	10	12	37	7	57	30	13	7	0.16	North America
6/23/2023	186,844	2004 GA1	TYC	264-00066-1	11	22	4	0	47	55	11	6.3	0.14	Australia
6/23/2023	1,685	Toro	HIP	78563	16	2	29	-26	8	53	6.3	9.3	0.43	South Africa
6/25/2023	186,844	2004 GA1	TYC	263-00230-1	11	18	1	2	24	31	9.9	7.7	0.14	Australia
6/25/2023	66,391	Moshup	UCAC4	452-048365	10	18	12	0	16	43	12	5.9	0.05	Australia
6/27/2023	1,685	Toro	UCAC4	324-080069	15	56	11	-25	19	14	13	2.5	0.37	North America
7/2/2023	1,627	Ivar	UCAC4	490-056619	12	54	3	7	57	28	14	1	0.76	North America
7/4/2023	186,844	2004 GA1	TYC	850-01192-1	10	53	40	11	18	51	9.1	9.1	0.11	Africa
7/6/2023	186,844	2004 GA1	UCAC4	517-051683	10	47	21	13	20	51	13	5.1	0.1	Australia
7/8/2023	1,685	Toro	UCAC4	337-075292	15	39	48	-22	36	24	14	1.9	0.45	Australia
7/9/2023	1,685	Toro	UCAC4	338-077126	15	39	17	-22	29	52	13	3	0.46	South America
7/10/2023	1,685	Toro	HIP	76508	15	37	31	-22	7	1	6.9	9.1	0.5	Asia
7/14/2023	1,685	Toro	UCAC4	344-074986	15	34	25	-21	20	14	14	1.9	0.57	Japan
7/18/2023	66,391	Moshup	TYC	281-00694-1	12	16	25	0	48	14	12	6.3	0.06	Australia
7/20/2023	66,391	Moshup	TYC	282-00648-1	12	24	49	0	49	53	11	7.7	0.06	Africa
7/23/2023	1,627	Ivar	UCAC4	457-051664	13	33	11	1	12	43	15	0.7	0.54	North America
7/25/2023	1,943	Anteros	UCAC4	571-006391	2	57	51	24	8	20	14	5.8	0.1	Australia
7/29/2023	1,943	Anteros	UCAC4	574-006561	3	5	5	24	38	21	13	6.1	0.11	Australia
7/30/2023	1,627	Ivar	UCAC4	443-058527	13	50	22	-1	31	37	13	1.4	0.5	Japan