2025-12-08 / UCAC4 540-011698 / (16) Psyche

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Lionel Rousselot	O+	VID	M250	FR	GPS	19:41:30	19:42:56.662	19:43:12.466	19:44:30	0.570	0.570	15.80	178.5
2	show	Karl-Ludwig Bath	O+	VID	T180	DE	GPS	19:40:45	19:42:34.57	19:42:42.67	19:44:46	0.280	0.280	8.10	91.5
3	show	Andreas Eberle	O+	VID	M300	DE	GPS	19:42:03	19:42:24.048	19:42:37.905	19:43:42	0.110	0.110	13.86	156.6
4	show	Stefano Sposetti	O-	VID	M420	CH	GPS	19:41:50	::	::	19:43:50

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#92 : d3cace50-ddb8-11f0-547e-623c7ffc0576 [db: observed]

Using prediction d3cace50-ddb8-11f0-547e-623c7ffc0576 for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: Size = 180 x 141 km a',b' = 90.1, 70.3 km X0,Y0 = 238.1, -21.2 km Mean diameter = 159 km From 3 chords (VID) Chords to ignore: Fill: Grid: Show (close) miss chords: 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: 2025-12-08, 19:41 UT (JD = 2461018.320)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 113	None	4.196	32°, -7°	2.435467e6	25551.3	0.0°	size from AO is 213+/-15 km	2013-07-23	211.0 +/- 21.0 km	2011-03-27
# 1806	4.0	4.196	36°, -10°	2.4573574472e6	3660.9	0.0°	nonconvex model, more details at http://observations.lam.fr/astero/	2018-11-02	224.0 +/- 5.0 km	2018-11-01

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

Map with groundtrack and observer stations

Event Details

Occultation UUID [and DB] : d3cace50-ddb8-11f0-547e-623c7ffc0576 [observed] Occultation Date + Time : 2025-12-08 at 19:37:55 UT +/- 0.01 min [1] Object Designation : (16) Psyche Orbit Class : MBA Star Designation : GDR3 3407280264103944960 Star Coordinates (ICRF) : RA = 04 59 56.5897, DE = +17 59 01.834 [2] Star Magnitudes : G = 10.62 mag, RP = 10.09 mag, BP = 10.98 mag Object Magnitude : V = 9.68 mag Estimated Magnitude Drop : 0.4 mag Estimated Max. Duration : 22.4 sec Object Mean Diameter : 253.2 km (src: astorb) Speed of the shadow : 11.3 km/s Elongation to Moon & Sun : 55° (sunlit = 80%), Sun = 175° Cross-track uncertainty : 2.0 mas = 2 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#92 Note : FP:true Object is a Gaia mass determination target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia

Aladin Sky Atlas

Aladin Lite direct link (has Gaia overlay)