2025-08-18 / UCAC4 545-004495 / (15917) Rosahavel

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Michal Rottenborn	O+	VID	M254	CZ	GPS	02:13:28	02:14:28.310	02:14:29.710	02:15:28	0.100	0.100	1.40	15.8
2	show	Jiri Polak	O+	VID	M300	CZ	NTP	02:12:29	02:14:29.37	02:14:30.72	02:16:29	0.080	0.080	1.35	15.3

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#53 : 48559f90-ddb7-11f0-547e-027a77ef4e9b [db: observed]

Using prediction 48559f90-ddb7-11f0-547e-027a77ef4e9b for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: X0,Y0 = 950.5, 38.4 km Circular diameter = 16 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: 2025-08-18, 02:14 UT (JD = 2460905.593)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 2130	1.5	10.219	276°, -44°	2.450772e6	10133.6	0.0°	None	2018-07-19	not scaled	2018-07-18
# 2131	1.5	10.219	79°, -58°	2.450772e6	10133.6	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] : 48559f90-ddb7-11f0-547e-027a77ef4e9b [observed] Occultation Date + Time : 2025-08-18 at 02:15:30 UT +/- 0.01 min [1] Object Designation : (15917) Rosahavel Orbit Class : MBA Star Designation : GDR3 0086050258186486528 Star Coordinates (ICRF) : RA = 02 26 51.7590, DE = +18 52 27.370 [2] Star Magnitudes : G = 14.57 mag, RP = 14.02 mag, BP = 14.95 mag Object Magnitude : V = 18.36 mag Estimated Magnitude Drop : 3.8 mag Estimated Max. Duration : 0.6 sec Object Mean Diameter : 6.3 km (src: astorb) Speed of the shadow : 11.3 km/s Elongation to Moon & Sun : 40° (sunlit = 29%), Sun = 105° Cross-track uncertainty : 0.7 mas = 1 km = 0.17 path-width (1-sig) RUWE and duplicate source : 1.03 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#53 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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