2025-09-18 / UCAC4 381-169151 / (449) Hamburga

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Nosal	O+	VID	M250	SK	NTP	23:15:28	23:16:07.570	23:16:10.970	23:15:55	0.100	0.100	3.40	40.1
2	show	Peter Nosal, Paula Libic	O+	VID	M200	SK	NTP	23:15:19	23:16:08.290	23:16:12.000	23:17:41	0.120	0.200	3.71	43.8

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#75 : 73374100-ddb7-11f0-547e-5bcbbcfbded8 [db: observed]

Using prediction 73374100-ddb7-11f0-547e-5bcbbcfbded8 for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: X0,Y0 = 1501.1, 10.5 km Circular diameter = 46 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: 2025-09-18, 23:15 UT (JD = 2460937.469)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5400	1.0	18.039	67°, 13°	2.457482e6	3455.5	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5401	1.0	18.039	251°, 16°	2.457482e6	3455.5	0.0°	None	2020-10-05	not scaled	2019-10-23

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] : 73374100-ddb7-11f0-547e-5bcbbcfbded8 [observed] Occultation Date + Time : 2025-09-18 at 23:21:25 UT +/- 0.0 min [1] Object Designation : (449) Hamburga Orbit Class : MBA Star Designation : GDR3 2600872937070470912 Star Coordinates (ICRF) : RA = 22 32 14.8312, DE = -13 58 52.452 [2] Star Magnitudes : G = 14.28 mag, RP = 13.57 mag, BP = 14.84 mag Object Magnitude : V = 14.23 mag Estimated Magnitude Drop : 0.7 mag Estimated Max. Duration : 7.3 sec Object Mean Diameter : 85.6 km (src: astorb) Speed of the shadow : 11.8 km/s Elongation to Moon & Sun : 168° (sunlit = 8%), Sun = 158° Cross-track uncertainty : 0.7 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.99 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#75 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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