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2020-08-07 / 4UC 594-011804 / (283) Emma

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Roland Boninsegna O+ VID M400 BE GPS++ 02:58:19 03:00:21.15 03:00:25.43 03:02:18 0.16 0.20 4.28 122.8
2 show Jean Bourgeois O+ VID M356 BE GPS++ 03:00:33 03:00:21.80 03:00:26.20 03:01:30 0.40 0.32 4.40 126.3
3 show O. Schreurs et al O+ VID M406 BE GPS++ 02:59:01 03:00:23.51 03:00:27.67 03:02:00 0.16 0.16 4.16 119.4
4 show Pierre Le Cam O- CCD M250 FR 02:58:00 03:02:01
5 show Henk De Groot O- VID M356 NL 02:58:03 03:02:33
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

5 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#106 : af59a2da-c9c9-4904-b694-696c1f7694c8 [db: observed]

Using prediction af59a2da-c9c9-4904-b694-696c1f7694c8 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 = 126 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: 2020-08-07, 03:00 UT (JD = 2459068.625)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 196None6.895 251°, 22° 2.44342031377e615648.30.0° None2010-04-15 not scaled 2008-11-14
# 18594.06.895 257°, 23° 2.44342031377e615648.30.0° None2017-09-21 147.0 +/- 14.0 km 2017-09-21
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] : af59a2da-c9c9-4904-b694-696c1f7694c8 [observed]

 Occultation Date + Time   : 2020-08-07 at 03:01:58 UT +/- 0.01 min  [1]
 Object Designation        : (283) Emma
 Orbit Class               : MBA
 Star Designation          : GDR3 0164629949044124928
 Star Coordinates (ICRF)   : RA = 04 21 53.0155, DE = +28 43 54.625  [2]
 Star Magnitudes           : G = 14.56 mag, RP = 13.87 mag, BP = 15.06 mag
 Object Magnitude          : V = 14.39 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 5.2 sec
 Object Mean Diameter      : 148 km  (src: astorb)
 Speed of the shadow       : 28.7 km/s
 Elongation to Moon & Sun  : 74° (sunlit = 88%), Sun = 67°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.01 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#106

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

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