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2021-12-28 / 4UC 602-017692 / (162) Laurentia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Alberto Ossola O+ VID M230 CH GPS++ 19:30:16 19:32:11.17 19:32:20.45 19:33:54 0.40 0.40 9.28 98.4
2 show Andrea Manna O+ VID M200 CH GPS++ 19:30:35 19:32:10.71 19:32:15.27 19:34:09 0.48 0.24 4.56 48.3
3 show Stefano Sposetti O+ CCD M420 CH GPS++ 19:29:20 19:32:11.09 19:32:14.87 19:35:20 0.20 0.20 3.78 40.1
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#71 : a92e1e9e-86f7-4754-bf10-b6cd0d2e26a3 [db: observed]
JPL#71 : 41640442-6c68-4893-8498-ec8b739edafc [db: observed]
JPL#71 : 69fd8e54-d5aa-4022-93ad-c4059d8888c9 [db: observed]

Using prediction a92e1e9e-86f7-4754-bf10-b6cd0d2e26a3 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 = 155 km

From 3 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: 2021-12-28, 19:32 UT (JD = 2459577.314)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 325None11.869 139°, 64° 2.440625e618952.30.0° None2011-05-02 not scaled 2011-04-21
# 326None11.869 313°, 51° 2.440625e618952.30.0° 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] : a92e1e9e-86f7-4754-bf10-b6cd0d2e26a3 [observed]

 Occultation Date + Time   : 2021-12-28 at 19:28:01 UT +/- 0.01 min  [1]
 Object Designation        : (162) Laurentia
 Orbit Class               : MBA
 Star Designation          : GDR3 0156181439135255424
 Star Coordinates (ICRF)   : RA = 05 10 49.2220, DE = +30 12 25.688  [2]
 Star Magnitudes           : G = 14.38 mag, RP = 13.91 mag, BP = 14.66 mag
 Object Magnitude          : V = 13.06 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 9.4 sec
 Object Mean Diameter      : 99 km  (src: astorb)
 Speed of the shadow       : 10.6 km/s
 Elongation to Moon & Sun  : 129° (sunlit = 32%), Sun = 161°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.1 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#71

 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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Aladin Sky Atlas
Aladin Lite direct link (has Gaia overlay)