Lunar occultation of double stars - Project OLED

OBSERVING PROGRAMME - APRIL 2025

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

DOUBLE STAR WDS PROGRAMME

The table below shows the occultations of the WDS programmme for APRIL 2025. 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". A summary of these predictions, with detailed information for each observer of the project, can be found here.

Urg.1 Day2 UTC3 Star (WDS)4 RA5 DEC6 Mags.7 Year8 # obs9 Sep.10 PA11 Type12 Flux13 Illum.14 Def.15 γ16 hSun17 hMoon18 Map19
B 4 21:37:33 J06552+2721 6 55 13.72 +27 21 10.9 8.7/10.9/ 8.5 2011 5 0.9 258 I 0.89/0.11 48.0 - 140 -31 48 mapa
B 4 23:58:57 J07008+2716AB 7 0 45.04 +27 16 4.1 9.8/ 9.9/ 9.1 2016 28 0.3 32 I 0.52/0.48 49.1 - 76 -43 22 mapa
B 5 21:06:46 J07533+2529AB 7 53 21.77 +25 27 29.5 10.0/10.6/ 9.5 2015 15 10.6 249 I 0.63/0.37 58.5 676 47 -26 62 mapa
B 5 21:41:00 J07546+2513 7 54 36.67 +25 12 48.4 10.4/10.6/ 9.7 2016 14 1.0 307 I 0.55/0.45 58.7 770 83 -31 56 mapa
B 5 23:02:34 J07560+2440 7 56 1.50 +24 39 56.6 7.8/10.1/ 7.7 2015 18 18.9 160 I 0.90/0.10 59.3 466 173 -40 41 mapa
B 6 23:10:42 J08514+2105 8 51 22.60 +21 4 49.3 9.5/ 9.0/ 8.5 2011 15 0.4 336 I 0.61/0.39 69.2 567 116 -40 47 mapa
B 6 23:29:13 J08514+2053 8 51 21.06 +20 53 24.1 10.2/10.9/ 9.8 2015 27 26.0 339 I 0.65/0.35 69.4 435 155 -42 44 mapa
B 9 19:16:03 J11082+0634AB 11 8 13.54 + 6 34 24.7 8.4/10.9/ 8.3 2016 22 12.4 96 I 0.91/0.09 90.9 129 84 -6 39 mapa
B 16 01:50:34 J15432-2525 15 43 11.57 -25 24 56.2 7.3/ 9.3/ 7.1 2016 30 5.9 291 E 0.86/0.14 -91.7 87 247 -35 25 mapa
B 17 04:54:40 J16402-2800AB 16 40 12.19 -27 59 50.4 9.2/10.6/ 8.9 2019 5 0.2 2 E 0.79/0.21 -84.9 238 308 -8 18 mapa
B 17 04:54:40 J16402-2800AB,C 16 40 12.19 -27 59 50.4 8.9/ 9.4/ 8.4 2016 21 8.1 359 E 0.62/0.38 -84.9 238 308 -8 18 mapa
A 20 03:37:27 J19263-2741 19 26 20.00 -27 41 16.3 10.2/10.3/ 9.5 1991 9 1.7 202 E 0.51/0.49 -59.5 742 261 -20 16 mapa
B 23 04:39:11 J22112-1449 22 11 13.93 -14 50 0.4 10.4/10.8/ 9.8 2016 16 2.2 125 E 0.59/0.41 -27.8 - 221 -9 16 mapa

1 Degree of urgency of the observation. A: High. B: Low.
2 Day of occultation.
3 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.
4 ID number of star in WDS (Washington Double Star) catalogue.
5 J2000.0 right ascension (hh mm ss.ss).
6 J2000.0 declination (dd mm ss.s).
7 Magnitude of components and total magnitude.
8 Year of last observation.
9 Total number of observations.
10 Last measurement of separation between components, in arcseconds.
11 Last measurement of position angle, in degrees.
12 Type of occultation. I: ingress. E: egress.
13 Fractional change of flux in reference to combined flux. The two values refer to ingress or egress of each component.
14 % fraction of illuminated area of Moon (positive, waxing Moon; negative, waning Moon).
15 Distance from contact to Moon terminator, in arcseconds.
16 Position angle of contact in ° (from N to E).
17 Height of Sun above horizon in reference location at contact time, in °.
18 Height of Moon above horizon in reference location at contact time, in °.
19 Contact map for observers.

GAIA DR3 NONSINGLE STAR PROGRAMME

The observing programme for APRIL 2025 includes a short list of stars from the Gaia DR3 nonsingle star catalogue for which occultation work can confirm duplicity. A summary of these predictions, with detailed information for each observer of the project, can be found here.

General information on the programme can be found in this link.

Day Gaia DR3 id PPM/TYC id mag. Type UTC (hh.mmss)
Tenerife Madrid Asturias Barcelona Marseille Chatillon
1 65275501377570944  92813  8.5 I 21.2523 21.0929 21.0630 21.0959 - 21.0746
3 3431083453898390912  1871-1855-1  9.9 I - - - 23.1859 23.0856 23.0050
5 681510502699783680  98137  7.8 I - 23.0234 22.5346 22.5625 22.5056 22.4046
8 619459662768506496  126775  9.6 I - 02.2557 02.2022 - - 02.1210
9 3818011388233235968  157544  8.4 I - 19.1603 - 19.3108 - -
17 6044426330301286656  732785  9.7 E - 01.2149 01.2302 01.4810 01.5945 01.5655
19 4048089414733358208  268470  6.9 E 02.3513 03.2130 03.1855 03.3407 03.4138 03.3752
19 4048280699765415552  268580  9.2 E 05.4346 - - - - -

Last revised 01 Abr 25
E. Velasco
Agrupación Astronómica de Madrid
Universidad Autónoma de Madrid
Spain