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
3/1/2023	UCAC4	594-038967	7	24	10	28	38	25	15.4	4.2	0.15	South America
3/4/2023	UCAC4	592-040220	7	28	13	28	17	47	15.3	4.5	0.13	South America
3/6/2023	UCAC4	591-041633	7	30	14	28	7	40	12.6	7.2	0.12	Africa, Asia
3/7/2023	UCAC4	591-041679	7	30	43	28	5	13	14.0	5.9	0.12	North America
3/8/2023	UCAC4	591-041760	7	31	43	28	0	33	15.3	4.6	0.12	South America
3/10/2023	UCAC4	589-040972	7	35	2	27	44	42	13.7	6.4	0.11	Europe, Asia
3/11/2023	UCAC4	589-041027	7	35	57	27	40	34	15.0	5.1	0.10	Australia, Asia
3/12/2023	UCAC4	589-041067	7	36	29	27	38	7	15.0	5.1	0.10	South America
3/12/2023	UCAC4	588-041064	7	37	35	27	32	51	15.0	5.1	0.10	Europe, Africa
3/14/2023	UCAC4	588-041173	7	38	58	27	26	37	13.7	6.4	0.10	South America
3/20/2023	UCAC4	585-040450	7	47	9	26	49	26	13.7	6.7	0.08	North, South America
3/20/2023	TYC	1920-00827-1	7	48	0	26	45	39	10.0	10.5	0.08	Europe, Asia
3/27/2023	UCAC4	581-040776	7	57	48	26	2	2	14.4	6.3	0.07	Australia
4/1/2023	TYC	1931-00446-1	8	5	56	25	25	37	11	10	0.06	Europe
4/2/2023	TYC	1931-00646-1	8	6	7	25	24	56	12	9.4	0.06	South America
4/3/2023	TYC	1931-01066-1	8	8	39	25	13	26	12	9.6	0.06	Asia
4/4/2023	UCAC4	576-043034	8	10	2	25	7	18	13	7.8	0.06	Asia
4/9/2023	UCAC4	573-043875	8	17	3	24	35	25	14	7.3	0.06	North America
4/19/2023	UCAC4	567-043146	8	34	2	23	16	18	14	7.5	0.05	Japan

Didymos Events for March and April in XML format for Occult (186 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
3/4/2023	169,549	2002 EG105	UCAC4	324-195834	19	5	7	-25	20	43	14.7	7.2	0.05	South America
3/14/2023	29,886	Randytung	UCAC4	373-182886	20	59	45	-15	28	2	15.0	5.9	0.08	Australia
3/16/2023	169,549	2002 EG105	UCAC4	325-204246	19	25	11	-25	7	57	14.9	6.9	0.05	South America
3/19/2023	169,549	2002 EG105	UCAC4	325-205354	19	29	35	-25	4	31	14.9	6.9	0.06	Africa
3/20/2023	169,549	2002 EG105	UCAC4	325-205722	19	31	7	-25	3	17	13.4	8.4	0.06	Africa
3/20/2023	169,549	2002 EG105	UCAC4	325-205717	19	31	7	-25	3	17	14.4	7.4	0.06	Africa
4/4/2023	42,532	1995 OR	UCAC4	374-177763	22	5	12	-15	13	60	13	7.2	0.07	North America
4/9/2023	29,886	Randytung	UCAC4	387-143579	21	35	26	-21	45	23	13	7.4	0.1	North America
4/11/2023	169,549	2002 EG105	UCAC4	328-198119	20	3	5	-24	34	39	15	6.2	0.08	North America
4/17/2023	169,549	2002 EG105	UCAC4	328-198880	20	10	17	-24	28	45	13	8.8	0.09	South America
4/26/2023	54,212	2000 HJ89	UCAC4	425-131258	22	32	50	-5	10	56	16	5.9	0.05	New Zealand
4/28/2023	169,549	2002 EG105	UCAC4	329-195422	20	22	41	-24	22	6	15	6.9	0.11	North America
4/28/2023	169,549	2002 EG105	UCAC4	329-195408	20	22	27	-24	22	5	14	7.8	0.11	South America
4/30/2023	169,549	2002 EG105	UCAC4	329-195568	20	24	19	-24	21	47	14	7.7	0.12	Europe

OtherHera targets' events for March and April 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
3/14/2023	137,170	1999 HF1	UCAC4	469-094637	19	11	9	3	29	3	14.0	3.4	0.15	North America
3/17/2023	137,170	1999 HF1	UCAC4	472-092173	19	19	21	4	13	23	13.5	3.8	0.15	Africa
3/18/2023	1,685	Toro	UCAC4	294-125846	17	20	3	-31	12	45	11.8	6.3	0.32	Australia
3/18/2023	137,170	1999 HF1	UCAC4	474-092560	19	24	23	4	40	52	13.3	3.9	0.15	Asia
3/19/2023	137,170	1999 HF1	UCAC4	475-095527	19	25	41	4	48	1	12.9	4.4	0.15	South America
3/20/2023	1,685	Toro	HIP	84995	17	22	22	-31	17	51	8.2	9.8	0.35	Asia
3/21/2023	137,170	1999 HF1	UCAC4	477-098326	19	31	13	5	18	34	13.7	3.6	0.15	Africa
3/25/2023	1,685	Toro	UCAC4	293-133213	17	27	13	-31	28	37	13.5	4.4	0.40	North America
3/25/2023	137,170	1999 HF1	UCAC4	483-113098	19	43	14	6	25	39	13.6	3.6	0.15	Europe
3/27/2023	137,170	1999 HF1	UCAC4	486-115089	19	51	22	7	11	40	13.2	3.9	0.15	Australia
3/31/2023	137,170	1999 HF1	UCAC4	491-129303	20	1	59	8	11	36	12.7	4.4	0.15	Africa
4/1/2023	506,459	2002 AL14	HIP	32919	6	51	32	47	21	48	8.5	10.9	0.08	Japan
4/2/2023	137,170	1999 HF1	UCAC4	496-128556	20	10	42	9	0	57	13	3.9	0.15	Australia
4/3/2023	1,685	Toro	UCAC4	292-129725	17	35	5	-31	47	20	14	4	0.6	Australia
4/5/2023	175,706	1996 FG3	UCAC4	506-049417	9	12	32	11	4	28	15	3.5	0.22	Europe
4/6/2023	506,459	2002 AL14	TYC	3395-01673-1	7	6	59	48	1	57	10	9.5	0.07	Europe
4/6/2023	1,685	Toro	UCAC4	291-134545	17	36	53	-31	52	26	16	2.3	0.7	North America, Europe
4/6/2023	175,706	1996 FG3	UCAC4	506-049383	9	11	39	11	9	53	13	6.1	0.24	Europe
4/7/2023	1,627	Ivar	UCAC4	507-053889	13	6	26	11	13	51	14	0.6	0.88	Japan
4/8/2023	175,706	1996 FG3	UCAC4	507-048276	9	10	44	11	15	47	15	3.7	0.26	North America
4/8/2023	1,627	Ivar	UCAC4	508-055814	13	4	54	11	31	50	15	0.5	0.89	Europe,Asia
4/9/2023	137,170	1999 HF1	UCAC4	506-133594	20	33	34	11	8	50	12	4.8	0.15	Australia
4/11/2023	1,685	Toro	UCAC4	290-133420	17	39	33	-32	1	2	16	2.2	1.05	South America
4/14/2023	137,170	1999 HF1	UCAC4	513-133077	20	48	35	12	30	1	14	3.5	0.15	Europe
4/16/2023	137,170	1999 HF1	UCAC4	517-131899	20	56	56	13	14	46	13	3.7	0.15	North America
4/16/2023	137,170	1999 HF1	UCAC4	517-132062	20	58	15	13	21	46	14	2.6	0.15	Japan
4/16/2023	175,706	1996 FG3	UCAC4	409-048065	9	6	52	11	46	6	13	6.6	0.97	Africa
4/19/2023	96,590	2003 YE45	TYC	2412-01242-1	5	41	20	34	30	1	10	8.7	0.04	North America
4/20/2023	137,170	1999 HF1	UCAC4	523-142971	21	10	58	14	27	17	15	2.3	0.14	Europe
4/20/2023	1,627	Ivar	UCAC4	521-053393	12	49	27	14	4	56	14	0.7	1.01	Australia
4/21/2023	137,170	1999 HF1	UCAC4	525-141516	21	15	50	14	51	43	14	2.9	0.14	North America
4/21/2023	137,170	1999 HF1	UCAC4	525-141532	21	15	57	14	52	18	15	2.5	0.14	North America
4/23/2023	137,170	1999 HF1	UCAC4	528-146515	21	23	36	15	29	47	15	2.5	0.14	North America
4/25/2023	175,706	1996 FG3	UCAC4	510-049412	21	10	58	14	27	17	14	5.7	0.54	Australia
4/26/2023	1,685	Toro	UCAC4	289-129222	17	41	4	-32	19	28	11	2.7	2.1	Africa
4/27/2023	137,170	1999 HF1	UCAC4	535-141136	21	41	15	16	52	11	14	2.7	0.14	Japan
4/28/2023	1,627	Ivar	UCAC4	527-053691	12	40	9	15	13	27	14	0.6	1.22	Europe
4/28/2023	1,627	Ivar	UCAC4	527-053689	12	40	5	15	13	54	16	0.28	1.22	Europe
4/30/2023	96,590	2003 YE45	UCAC4	624-031204	6	18	58	34	37	52	13	6.1	0.04	Africa