Cora»Occultation

2026-02-24 / UCAC4 522-018106 / (4424) Arkhipova

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jonas Schenker, Josef Kaeser	O+	VID	T450	CH	GPS	21:58:52	21:59:06.56	21:59:08.53	21:59:23	0.040	0.030	1.97	17.7
2	show	Michal Rottenborn	O+	VID	M254	CZ	GPS	21:58:41	21:59:40.250	21:59:42.000	22:00:41	0.050	0.050	1.75	15.8
3	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	21:58:43	21:59:42.2	21:59:43.9	22:00:42	0.400	0.400	1.70	15.3
4	show	Jiri Polak	O-	VID	M300	CZ	NTP	21:58:11	::	::	22:01:11

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#71 : 11788170-de77-11f0-4858-bb46fbefb23d [db: asteroids]

Using prediction 11788170-de77-11f0-4858-bb46fbefb23d 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:
Size = 64 x 16 km
a',b' = 32.2, 7.8 km
X0,Y0 = -362.6, 21.6 km
Mean diameter = 32 km

From 3 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: 2026-02-24, 21:59 UT (JD = 2461096.416)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 2371	1.5	14.680	176°, -42°	2.449867e6	11229.4	0.0°	None	2018-07-19	not scaled	2018-07-18
# 2372	1.5	14.680	319°, -43°	2.449867e6	11229.4	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

Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 11788170-de77-11f0-4858-bb46fbefb23d [asteroids] Occultation Date + Time : 2026-02-24 at 21:50:22 UT +/- 0.01 min [1] Object Designation : (4424) Arkhipova Orbit Class : MBA Star Designation : GDR3 3346951779077698688 Star Coordinates (ICRF) : RA = 05 56 19.4593, DE = +14 20 30.146 [2] Star Magnitudes : G = 13.89 mag, RP = 13.14 mag, BP = 14.51 mag Object Magnitude : V = 16.59 mag Estimated Magnitude Drop : 2.8 mag Estimated Max. Duration : 2.8 sec Object Mean Diameter : 25.0 km (src: astorb) Speed of the shadow : 9.0 km/s Elongation to Moon & Sun : 23° (sunlit = 55%), Sun = 112° Cross-track uncertainty : 0.3 mas = 0 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.03 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#71 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 11788170-de77-11f0-4858-bb46fbefb23d [asteroids]

 Occultation Date + Time   : 2026-02-24 at 21:50:22 UT +/- 0.01 min  [1]
 Object Designation        : (4424) Arkhipova
 Orbit Class               : MBA
 Star Designation          : GDR3 3346951779077698688
 Star Coordinates (ICRF)   : RA = 05 56 19.4593, DE = +14 20 30.146  [2]
 Star Magnitudes           : G = 13.89 mag, RP = 13.14 mag, BP = 14.51 mag
 Object Magnitude          : V = 16.59 mag
 Estimated Magnitude Drop  : 2.8 mag
 Estimated Max. Duration   : 2.8 sec
 Object Mean Diameter      : 25.0 km  (src: astorb)
 Speed of the shadow       : 9.0 km/s
 Elongation to Moon & Sun  : 23° (sunlit = 55%), Sun = 112°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#71
 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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