Lunar occultation of double stars - Project OLED

The programme for this month includes targets from the following campaigns:

• Double star WDS programme
• Gaia DR3 nonsingle star programme

The table below (check here for key) Urg: Degree of urgency of the observation. A: High. B: Low.
Day: Day of occultation.
UTC: UTC of occultation in Madrid (in black), Barcelona (green), La Laguna (red) and Marseille (blue).
Note that some events might be visible in some places and not in others (check column "OLED").
Star (WDS): ID number of star in WDS (Washington Double Star) catalogue.
RA: J2000.0 right ascension (hh mm ss.ss).
DEC: J2000.0 declination (dd mm ss.s).
Mags: Magnitude of components and total magnitude.
Year: Year of last observation.
# obs: Total number of observations.
Sep: Last measurement of separation between components, in arcseconds.
PA: Last measurement of position angle, in degrees.
Type: Type of occultation. I: ingress. E: egress.
Flux: Fractional change of flux in reference to combined flux. The two values refer to ingress or egress of each component.
Illum: % fraction of illuminated area of Moon (positive, waxing Moon; negative, waning Moon).
Def: Distance from contact to Moon terminator, in arcseconds.
γ: Position angle of contact in ° (from N to E).
hSun: Height of Sun above horizon in reference location at contact time, in °.
hMoon: Height of Moon above horizon in reference location at contact time, in °.
Graph: Schematic of the chord as seen from the location specified in column "UTC".
OLED: Circumstances for OLED observers with a user acronym and for different European and Northern African cities .
shows the occultations of the WDS programmme for JULY 26. Please report observations by writing an email to enrique.velasco@uam.es. For more accurate predictions on these occultations for your position, visit this link and choose "WDS (double stars)" as the "Object catalogue". To quickly check for visibility of an occultation from your particular station, click on column "OLED", and look for your acronym.

The following table (check here for key) Day: Day of occultation.
Gaia DR3: ID number of star in Gaia DR3 catalogue (check SIMBAD CDS database by placing the mouse on the number).
Mag: Magnitude of star.
Type: Type of occultation. I: ingress. E: egress.
UTC: UTC of occultation (see location by placing the mouse on the time). Note that some events might be visible in some places and not in others (check column "OLED").
Impact: impact parameter in units of lunar semidiameter (grazing occultation will have impact close to one, while impact will be close to zero for occultation through or close to centre of Moon's disc).
a: longitude correction, in minutes of time per degree of longitude.
b: latitude correction, in minutes of time per degree of latitude.
Illum: percentage of Moon illuminated. Positive: waxing Moon. Negative: waning Moon.
Def: defect of illumination at contact (radial distance from contact to terminator), in seconds of arc. Calculated in events at dark limb.
γ: position angle of event in degrees, measured from north celestial pole in the positive sense (eastward).
P: P: position angle of lunar north pole in degrees, measured from north celestial pole in the positive sense (eastward).
C1: position angle of first cusp, measured from north celestial pole eastward and defined as first cusp from subsolar point in the positive sense.
C2: position angle of second cusp, measured from north celestial pole eastward and defined as second cusp from subsolar point in the positive sense, or first cusp from subsolar point in the negative sense.
hSun: Height of Sun above horizon in reference location at contact time, in °.
hMoon: Height of Moon above horizon in reference location at contact time, in °.
AMoon: azimuth of Moon along local horizon in degrees, measured from S westward.
Graph: Schematic of the chord as seen from the location specified in column "UTC".
Visibility: Areas of visibility. Check in this link for more detail information.
lists the suggested targets from the Gaia DR3 NSS catalogue. UTC and all other data are given for a specific reference location (hover over the UTC time to see where). Please note that the event may not be visible from your location. To check for visibility, and for more detailed predictions, please visit this link and choose "GAIA nonsingle stars" (in future months an "OLED" column showing contact times for all observers and stations will be available).

Day	Gaia DR3	Mag	Type	UTC	Impact	a	b	Illum	Def	γ	P	C1	C2	hSun	hMoon	AMoon	Graph	Visibility
2	6855971018032661376	9.8	E	05:48:31 UTC in La Laguna	0.32	+ 0.59	+ 0.80	-95.4	50	220	345	171	351	-5.3	25.3	44.7		Canary Islands
2	6833358393173955712	6.7	E	23:14:03 UTC in Barcelona	0.56	+ 1.33	+ 2.17	-92.0	92	215	342	166	346	-24.9	17.3	315.0		Central and Eastern Europe
4	6840453610427365504	9.1	E	00:46:11 UTC in Madrid	0.89	+ 0.53	+ 3.20	-85.5	40	178	339	160	340	-26.3	25.4	316.7		Western and Central Europe
6	2740653820246047104	9.2	E	23:43:04 UTC in Berlin	0.61	+ 0.12	+ 2.09	-59.0	719	203	337	156	336	-14.6	16.2	284.2		Central Europe
7	2741082870299180928	9.4	E	01:18:41 UTC in Madrid	0.24	+ 0.62	+ 1.76	-58.3	782	247	337	156	336	-25.5	23.6	284.5		Europe and Northern Africa
8	2582896991403487488	9.7	E	02:19:37 UTC in Paris	0.90	- 0.62	+ 2.97	-47.0	-	174	338	158	338	-11.8	32.2	291.8		Northwestern Europe
10	108606322618018432	9.4	E	03:52:28 UTC in Madrid	0.21	+ 0.33	+ 1.77	-24.7	-	239	345	166	346	-10.2	35.1	269.6		Canary Islands, Southern Europe, Northern Africa
27	6763159008153251200	9.9	I	22:23:10 UTC in Madrid	0.70	+ 2.52	-0.34	+97.3	24	119	353	342	162	-24.4	22.8	349.9		Western and Central Europe, Northern Africa

Information on the stars in the tables above has been collected with the help of

       

Last revised 01 JUL 26
E. Velasco
Agrupación Astronómica de Madrid
Universidad Autónoma de Madrid
Spain