2025-10-02 / UCAC4 576-133356 / (426) Hippo

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith	O+	VID	M300	ES	GPS	02:40:05	02:40:35.759	02:40:38.862	02:42:48	0.027	0.027	3.10	44.6
2	show	Deborah Smith, Eric Smith	O+	VID	M150	ES	GPS	02:38:47	02:40:45.590	02:40:49.960	02:42:47	0.058	0.058	4.37	62.9
3	show	Deborah Smith	O+	VID	M200	ES	GPS	02:38:39	02:40:36.215	02:40:44.592	02:42:39	0.045	0.045	8.38	120.7

UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

3 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):

JPL#144 : 7c5d0fc0-ddb8-11f0-547e-8b2cdd673aed [db: observed]

Using prediction 7c5d0fc0-ddb8-11f0-547e-8b2cdd673aed for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: Ellipse profile fit was not successful. Trying circular fit. Circular diameter = 138 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: 2025-10-02, 02:39 UT (JD = 2460950.610)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 3492	1.0	67.504	319°, -66°	2.450868e6	10082.6	0.0°	None	2019-09-26	not scaled	2019-05-07
# 3493	1.0	67.503	14°, -57°	2.450868e6	10082.6	0.0°	None	2019-09-26	not scaled	2019-05-07

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] : 7c5d0fc0-ddb8-11f0-547e-8b2cdd673aed [observed] Occultation Date + Time : 2025-10-02 at 02:45:41 UT +/- 0.0 min [1] Object Designation : (426) Hippo Orbit Class : MBA Star Designation : GDR3 2852509818199604224 Star Coordinates (ICRF) : RA = 23 50 17.1332, DE = +25 10 45.216 [2] Star Magnitudes : G = 13.15 mag, RP = 12.67 mag, BP = 13.47 mag Object Magnitude : V = 13.34 mag Estimated Magnitude Drop : 0.9 mag Estimated Max. Duration : 8.8 sec Object Mean Diameter : 127.1 km (src: astorb) Speed of the shadow : 14.4 km/s Elongation to Moon & Sun : 69° (sunlit = 71%), Sun = 156° Cross-track uncertainty : 2.0 mas = 3 km = 0.03 path-width (1-sig) RUWE and duplicate source : 0.98 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#144 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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