Cora»Occultation

2025-08-17 / UCAC4 374-175759 / (53) Kalypso

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith, Eric Smith	O+	VID	M150	ES	GPS	02:33:59	02:35:57.879	02:36:05.079	02:37:59	0.714	0.714	7.20	97.2
2	show	Deborah Smith	O+	VID	M300	ES	GPS	02:34:00	02:35:59.398	02:36:05.799	02:38:00	0.440	0.440	6.40	86.4
3	show	Ferran Casarramona	O-	VID	M200	ES	GPS	02:35:02	::	::	02:37:02
4	show	Deborah Smith	O-	VID	M200	ES	GPS	02:34:03	::	::	02:38:03

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

4 observations found in db: sodis

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

JPL#205 : 464e0fc0-ddb7-11f0-547e-d768efabcc0d [db: observed]

Using prediction 464e0fc0-ddb7-11f0-547e-d768efabcc0d 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 = 1104.3, -0.4 km
Circular diameter = 122 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: 2025-08-17, 02:35 UT (JD = 2460904.608)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 1732	None	9.035	349°, 8°	2.444173e6	16731.6	0.0°	None	2016-07-07	not scaled	2016-07-07
# 1733	None	9.035	168°, 12°	2.444173e6	16731.6	0.0°	None	2016-07-07	not scaled	2016-07-07

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] : 464e0fc0-ddb7-11f0-547e-d768efabcc0d [observed] Occultation Date + Time : 2025-08-17 at 02:42:15 UT +/- 0.01 min [1] Object Designation : (53) Kalypso Orbit Class : MBA Star Designation : GDR3 6884346664363798528 Star Coordinates (ICRF) : RA = 21 16 32.0047, DE = -15 14 53.810 [2] Star Magnitudes : G = 13.98 mag, RP = 13.42 mag, BP = 14.38 mag Object Magnitude : V = 12.98 mag Estimated Magnitude Drop : 0.4 mag Estimated Max. Duration : 8.6 sec Object Mean Diameter : 115.4 km (src: astorb) Speed of the shadow : 13.5 km/s Elongation to Moon & Sun : 109° (sunlit = 40%), Sun = 172° Cross-track uncertainty : 1.0 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.08 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#205 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 464e0fc0-ddb7-11f0-547e-d768efabcc0d [observed]

 Occultation Date + Time   : 2025-08-17 at 02:42:15 UT +/- 0.01 min  [1]
 Object Designation        : (53) Kalypso
 Orbit Class               : MBA
 Star Designation          : GDR3 6884346664363798528
 Star Coordinates (ICRF)   : RA = 21 16 32.0047, DE = -15 14 53.810  [2]
 Star Magnitudes           : G = 13.98 mag, RP = 13.42 mag, BP = 14.38 mag
 Object Magnitude          : V = 12.98 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 8.6 sec
 Object Mean Diameter      : 115.4 km  (src: astorb)
 Speed of the shadow       : 13.5 km/s
 Elongation to Moon & Sun  : 109° (sunlit = 40%), Sun = 172°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.08 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#205
 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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