Cora»Occultation

2026-02-09 / J081145.33+124855.6 / (2731) Cucula

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith	O+	VID	M300	ES	GPS	21:58:51	21:59:40.585	21:59:43.100	22:00:51	0.005	0.005	2.51	39.4
2	show	Deborah Smith	O+	VID	M250	ES	GPS	21:58:46	21:59:43.457	21:59:46.347	22:00:46	0.004	0.004	2.89	45.4

UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

2 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):

JPL#79 : 2f80fb00-de74-11f0-4858-b4a7f6bf8f6b [db: asteroids]

Using prediction 2f80fb00-de74-11f0-4858-b4a7f6bf8f6b for map and profile fit

Get observations as KML file (reduced site location resolution)

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result:
X0,Y0 = -813.3, 25.4 km
Circular diameter = 48 km

From 2 chords (VID)

You can enter space separated chord numbers (example: 11 4 8) or a method like VIS to ignore all visual timings, or a time source like RAD and NTP (but not GPS).
If the plot disappears, then there are less than 2 chords left (too much ignored, go back with browser).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2026-02-09, 21:59 UT (JD = 2461081.416)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4986	1.0	61.453	322°, 64°	2.457359e6	3722.4	0.0°	None	2020-10-05	not scaled	2019-10-23
# 4987	1.0	61.454	112°, 38°	2.457359e6	3722.4	0.0°	None	2020-10-05	not scaled	2019-10-23

Q: model quality flag (0-5, 5=highest) | P: rotation period | λ,β: ecl. lon. and lat. of spin axis (J2000) | JD: initial time (epoch) | φ0: initial rotation angle for JD0

Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 2f80fb00-de74-11f0-4858-b4a7f6bf8f6b [asteroids] Occultation Date + Time : 2026-02-09 at 21:57:06 UT +/- 0.0 min [1] Object Designation : (2731) Cucula Orbit Class : MBA Star Designation : GDR3 0650494997669013504 Star Coordinates (ICRF) : RA = 08 11 45.3296, DE = +12 48 55.522 [2] Star Magnitudes : G = 11.37 mag, RP = 10.71 mag, BP = 11.87 mag Object Magnitude : V = 16.49 mag Estimated Magnitude Drop : 5.1 mag Estimated Max. Duration : 3.2 sec Object Mean Diameter : 50.9 km (src: astorb) Speed of the shadow : 15.7 km/s Elongation to Moon & Sun : 112° (sunlit = 46%), Sun = 160° Cross-track uncertainty : 0.4 mas = 0 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.46 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#79 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 2f80fb00-de74-11f0-4858-b4a7f6bf8f6b [asteroids]

 Occultation Date + Time   : 2026-02-09 at 21:57:06 UT +/- 0.0 min  [1]
 Object Designation        : (2731) Cucula
 Orbit Class               : MBA
 Star Designation          : GDR3 0650494997669013504
 Star Coordinates (ICRF)   : RA = 08 11 45.3296, DE = +12 48 55.522  [2]
 Star Magnitudes           : G = 11.37 mag, RP = 10.71 mag, BP = 11.87 mag
 Object Magnitude          : V = 16.49 mag
 Estimated Magnitude Drop  : 5.1 mag
 Estimated Max. Duration   : 3.2 sec
 Object Mean Diameter      : 50.9 km  (src: astorb)
 Speed of the shadow       : 15.7 km/s
 Elongation to Moon & Sun  : 112° (sunlit = 46%), Sun = 160°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.46 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#79
 Note                      : FP:true

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations

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