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2021-12-16 / 4UC 385-069494 / (313) Chaldaea

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jordi Marco O+ CCD M235 ES NTP+ 05:58:37 06:00:41.10 06:00:43.47 06:02:36 0.25 0.37 2.37 106.7
2 show C. Perello/A. Selva O+ VID M500 ES GPS++ 05:58:45 06:00:41.22 06:00:43.14 06:02:43 0.08 0.08 1.92 86.4
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 : a98ddd1f-476f-4857-bbc3-5faeba7c63fc [db: observed]

Using prediction a98ddd1f-476f-4857-bbc3-5faeba7c63fc 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 = -610.0, -46.2 km
Circular diameter = 166 km

From 2 chords (VID,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: 2021-12-16, 06:00 UT (JD = 2459564.750)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 1223None8.390 218°, 29° 2.443125e616439.80.0° NoneNone not scaled 2016-01-04
# 1224None8.390 44°, 11° 2.443125e616439.80.0° NoneNone not scaled 2016-01-04
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] : a98ddd1f-476f-4857-bbc3-5faeba7c63fc [observed]

 Occultation Date + Time   : 2021-12-16 at 06:02:26 UT +/- 0.0 min  [1]
 Object Designation        : (313) Chaldaea
 Orbit Class               : MBA
 Star Designation          : GDR3 6267894372060888192
 Star Coordinates (ICRF)   : RA = 15 40 19.3775, DE = -13 00 30.747  [2]
 Star Magnitudes           : G = 12.08 mag, RP = 11.61 mag, BP = 12.38 mag
 Object Magnitude          : V = 14.25 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 2.1 sec
 Object Mean Diameter      : 96 km  (src: astorb)
 Speed of the shadow       : 45.0 km/s
 Elongation to Moon & Sun  : 174° (sunlit = 93%), Sun = 29°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#117

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

More Data and Informations
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