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2022-11-07 / 4UC 553-047127 / (375) Ursula

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jordi Marco O+ CCD M235 ES NTP+ 05:17:31 05:19:30.40 05:19:35.69 05:21:17 0.02 0.02 5.29 100.0
2 show Joan Aragones O+ CCD M200 ES NTP+ 05:19:16 05:19:30.62 05:19:35.62 05:19:43 0.25 0.25 5.00 94.5
3 show Carles Schnabel O+ VID M400 ES GPS++ 05:18:16 05:19:29.74 05:19:33.98 05:20:32 0.01 0.01 4.24 80.1
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#87 (23-01-08) : bdd85804-bd37-4c57-939f-a6d75031e634 [db: observed]

Using prediction bdd85804-bd37-4c57-939f-a6d75031e634 for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result:
Size = 98 x 10 km
a',b' = 49.2, 5.1 km
X0,Y0 = -552.2, 100.4 km
Mean diameter = 32 km

From 3 chords (CCD,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).

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Map with groundtrack and observer stations

Event Details
 Occultation UUID [and DB] : bdd85804-bd37-4c57-939f-a6d75031e634 [observed]

 Occultation Date + Time   : 2022-11-07 at 05:21:43 UT +/- 0.03 min  [1]
 Object Designation        : (375) Ursula
 Star Designation          : GDR3 0627844336578802176
 Star Coordinates (ICRF)   : RA = 09 59 12.0081, DE = +20 24 52.125  [2]
 Star Magnitudes           : G = 9.25 mag, RP = 8.95 mag, BP = 9.42 mag
 Object Magnitude          : V = 13.66 mag
 Estimated Magnitude Drop  : 4.4 mag
 Estimated Max. Duration   : 5.6 sec
 Object Mean Diameter      : 107 km  (src: astorb+H10)
 Speed of the shadow       : 18.9 km/s
 Elongation to Moon & Sun  : 115° (sunlit = 98%), Sun = 80°
 Cross-track uncertainty   : 9.7 mas = 24 km = 0.23 path-width (1-sig)
 RUWE and duplicate source : 2.65 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#87 (23-01-08)

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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