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2021-04-29 / 4UC 638-039178 / (13) Egeria

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jiri Polak O+ CCD M303 CZ GPS++ 22:02:55 22:04:52.00 22:04:57.26 22:06:55 0.26 0.26 5.26 166.2
2 show Michal Rottenborn O+ CCD M254 CZ GPS++ 22:02:55 22:04:52.04 22:04:57.65 22:06:55 0.40 0.10 5.61 177.3
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#117 : 88526dd0-f234-46ee-8ebe-8499b3f9e91c [db: observed]

Using prediction 88526dd0-f234-46ee-8ebe-8499b3f9e91c 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:
Circular profile fit was not successful ...








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.

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Sky projection (artificial light) for occ. time: 2021-04-29, 22:03 UT (JD = 2459334.419)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 307None7.047 44°, 21° 2.438025e621309.40.0° None2011-05-02 not scaled 2011-04-21
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] : 88526dd0-f234-46ee-8ebe-8499b3f9e91c [observed]

 Occultation Date + Time   : 2021-04-29 at 22:03:21 UT +/- 0.0 min  [1]
 Object Designation        : (13) Egeria
 Orbit Class               : MBA
 Star Designation          : GDR3 0946166078241572864
 Star Coordinates (ICRF)   : RA = 07 03 29.3348, DE = +37 31 09.195  [2]
 Star Magnitudes           : G = 13.23 mag, RP = 12.76 mag, BP = 13.54 mag
 Object Magnitude          : V = 11.96 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 6.6 sec
 Object Mean Diameter      : 208 km  (src: astorb)
 Speed of the shadow       : 31.6 km/s
 Elongation to Moon & Sun  : 152° (sunlit = 89%), Sun = 64°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.84 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#117

 Object is a Gaia mass determination target !

 [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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