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2021-03-15 / 4UC 655-038057 / (13) Egeria

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Emmanuel Conseil O+ CCD M150 FR NTP+ 21:01:50 21:03:39.13 21:03:42.46 21:05:45 0.17 0.17 3.33 55.9
2 show Jean-Marie Barfety O+ CCD V112 FR NTP 21:01:02 21:03:38.51 21:03:47.58 21:07:01 0.75 0.75 9.07 152.4
3 show Pietro Baruffetti O- VID M300 IT 21:03:03 21:06:06
4 show Gianni Galli O- CCD M356 IT 21:04:13 21:04:35
5 show Alberto Ossola O- VID M230 CH 21:02:51 21:06:01
6 show Andrea Manna O- VID M200 CH 20:58:29 21:06:23
7 show Stefano Sposetti O- VID M280 CH 21:00:00 21:08:00
8 show Peter Tickner O- CCD M356 UK 21:01:30 21:03:30
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

8 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#117 : 743fb12e-f34c-40bc-863a-36e1be929952 [db: observed]

Using prediction 743fb12e-f34c-40bc-863a-36e1be929952 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:
X0,Y0 = -667.1, 61.2 km
Circular diameter = 251 km

From 2 chords (CCD)








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: 2021-03-15, 21:03 UT (JD = 2459289.377)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 307None7.047 44°, 21° 2.438025e621264.40.0° 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] : 743fb12e-f34c-40bc-863a-36e1be929952 [observed]

 Occultation Date + Time   : 2021-03-15 at 21:01:23 UT +/- 0.0 min  [1]
 Object Designation        : (13) Egeria
 Orbit Class               : MBA
 Star Designation          : GDR3 0191823963976505088
 Star Coordinates (ICRF)   : RA = 05 46 06.3081, DE = +40 55 16.454  [2]
 Star Magnitudes           : G = 12.55 mag, RP = 11.97 mag, BP = 12.95 mag
 Object Magnitude          : V = 11.55 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 12.4 sec
 Object Mean Diameter      : 208 km  (src: astorb)
 Speed of the shadow       : 16.8 km/s
 Elongation to Moon & Sun  : 67° (sunlit = 6%), Sun = 92°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 3.01 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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