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

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.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#134 : 8aeb6840-85ab-11ef-78cd-ae88a7bf5f14 [db: asteroids]

Using prediction 8aeb6840-85ab-11ef-78cd-ae88a7bf5f14 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 138 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: 2025-10-02, 02:39 UT (JD = 2460950.610)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 34921.067.504 319°, -66° 2.450868e610082.60.0° None2019-09-26 not scaled 2019-05-07
# 34931.067.503 14°, -57° 2.450868e610082.60.0° None2019-09-26 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

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

Map with groundtrack and observer stations

Event Details
 Occultation UUID [and DB] : 8aeb6840-85ab-11ef-78cd-ae88a7bf5f14 [asteroids]

 Occultation Date + Time   : 2025-10-02 at 02:45:37 UT +/- 0.0 min  [1]
 Object Designation        : (426) Hippo
 Orbit Class               : MBA
 Star Designation          : GDR3 2852509818199604224
 Star Coordinates (ICRF)   : RA = 23 50 17.1342, DE = +25 10 45.216  [2]
 Star Magnitudes           : G = 13.15 mag, RP = 12.67 mag, BP = 13.47 mag
 Object Magnitude          : V = 13.38 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#134

 
 [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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