Cora»Occultation

2025-12-31 / UCAC4 601-036226 / (445) Edna

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Anna Marciniak	O+	CCD	M400	PL	GPS	03:08:29	03:09:25.20	03:09:30.40	03:10:39	0.130	0.130	5.20	80.1
2	show	Anna Marciniak	O+	CCD	M350	PL	NTP	03:08:31	03:09:28.82	03:09:33.56	03:10:10	0.160	0.160	4.74	73.0

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):

JPL80 : 292ba010-d997-11f1-43f3-02b2fd6de463 [db: observed]

Using prediction 292ba010-d997-11f1-43f3-02b2fd6de463 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 = 667.4, 20.3 km
Circular diameter = 81 km

From 2 chords (CCD)

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: 2025-12-31, 03:08 UT (JD = 2461040.631)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 3952	1.0	19.976	10°, -45°	2.450856e6	10184.6	0.0°	None	2019-09-26	not scaled	2019-05-07

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] : 292ba010-d997-11f1-43f3-02b2fd6de463 [observed] Occultation Date + Time : 2025-12-31 at 03:14:13 UT +/- 0.01 min [1] Object Designation : (445) Edna Orbit Class : MBA Star Designation : GDR3 0936753605873870336 Star Coordinates (ICRF) : RA = 06 44 38.4416, DE = +30 09 06.033 [2] Star Magnitudes : G = 12.99 mag, RP = 12.34 mag, BP = 13.48 mag Object Magnitude : V = 13.48 mag Estimated Magnitude Drop : 1.0 mag Estimated Max. Duration : 5.7 sec Object Mean Diameter : 87.2 km (src: astorb) Speed of the shadow : 15.4 km/s Elongation to Moon & Sun : 46° (sunlit = 85%), Sun = 173° Cross-track uncertainty : 1.7 mas = 2 km = 0.03 path-width (1-sig) RUWE and duplicate source : 0.94 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL80 Note : FP:true Object is a "TNOs are cool" target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 292ba010-d997-11f1-43f3-02b2fd6de463 [observed]

 Occultation Date + Time   : 2025-12-31 at 03:14:13 UT +/- 0.01 min  [1]
 Object Designation        : (445) Edna
 Orbit Class               : MBA
 Star Designation          : GDR3 0936753605873870336
 Star Coordinates (ICRF)   : RA = 06 44 38.4416, DE = +30 09 06.033  [2]
 Star Magnitudes           : G = 12.99 mag, RP = 12.34 mag, BP = 13.48 mag
 Object Magnitude          : V = 13.48 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 5.7 sec
 Object Mean Diameter      : 87.2 km  (src: astorb)
 Speed of the shadow       : 15.4 km/s
 Elongation to Moon & Sun  : 46° (sunlit = 85%), Sun = 173°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.94 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL80
 Note                      : FP:true

 Object is a "TNOs are cool" target !

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

More Data and Informations

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