2025-11-18 / UCAC4 608-014699 / (21557) Daniellitt

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Roland BONINSEGNA	O+	VID	M400	BE	GPS	02:10:26	02:11:20.12	02:11:21.08	02:12:24	0.080	0.080	0.96	12.2
2	show	Jean Bourgeois	O+	VID	M280	BE	GPS	02:10:21	02:11:17.80	02:11:18.70	02:12:21	0.100	0.100	0.90	11.4

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#72 : ba1e1520-ddb8-11f0-547e-226edffdb76c [db: observed]

Using prediction ba1e1520-ddb8-11f0-547e-226edffdb76c for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: X0,Y0 = 337.9, 16.4 km Circular diameter = 12 km From 2 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: 2025-11-18, 02:10 UT (JD = 2460997.590)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 1890	1.5	4.234	15°, -12°	2.451055e6	9942.6	0.0°	None	2018-07-19	not scaled	2018-07-18
# 1891	1.5	4.234	195°, -39°	2.451055e6	9942.6	0.0°	None	2018-07-19	not scaled	2018-07-18

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] : ba1e1520-ddb8-11f0-547e-226edffdb76c [observed] Occultation Date + Time : 2025-11-18 at 02:14:13 UT +/- 0.02 min [1] Object Designation : (21557) Daniellitt Orbit Class : MBA Star Designation : GDR3 0171340405947117568 Star Coordinates (ICRF) : RA = 04 34 03.6383, DE = +31 28 43.926 [2] Star Magnitudes : G = 14.1 mag, RP = 13.08 mag, BP = 14.53 mag Object Magnitude : V = 16.86 mag Estimated Magnitude Drop : 2.8 mag Estimated Max. Duration : 0.9 sec Object Mean Diameter : 12.0 km (src: astorb) Speed of the shadow : 12.7 km/s Elongation to Moon & Sun : 141° (sunlit = 4%), Sun = 162° Cross-track uncertainty : 7.0 mas = 10 km = 0.91 path-width (1-sig) RUWE and duplicate source : 34.32 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#72 Note : FP:true [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

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