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2022-08-01 / 4UC 622-017534 / (117) Lomia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show O. Canales et al O+ CCD M200 ES GPS+ 01:57:30 01:57:47.31 01:57:50.36 01:58:01 0.57 0.57 3.05 103.4
2 show Gerard Vaudescal O+ CCD M254 FR GPS+ 01:56:52 01:57:52.32 01:57:53.89 01:59:00 0.25 0.17 1.57 53.2
3 show Michel Boutet O+ VID M250 FR GPS++ 01:55:03 01:57:51.22 01:57:55.06 02:00:59 0.16 0.16 3.84 130.2
4 show Josef Kaeser O- VID M450 CH 01:57:04 01:59:06
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

4 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#125 : 577bbf31-eb74-4e34-89f9-5f67b48c0343 [db: observed]

Using prediction 577bbf31-eb74-4e34-89f9-5f67b48c0343 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 = 132 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: 2022-08-01, 01:57 UT (JD = 2459792.581)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 838None9.124 117°, -19° 2.446333e613459.60.0° NoneNone not scaled 2016-01-04
# 839None9.124 323°, -57° 2.446333e613459.60.0° 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] : 577bbf31-eb74-4e34-89f9-5f67b48c0343 [observed]

 Occultation Date + Time   : 2022-08-01 at 01:59:41 UT +/- 0.01 min  [1]
 Object Designation        : (117) Lomia
 Orbit Class               : MBA
 Star Designation          : GDR3 0173720500726791424
 Star Coordinates (ICRF)   : RA = 04 40 12.6928, DE = +34 16 42.459  [2]
 Star Magnitudes           : G = 11.87 mag, RP = 11.15 mag, BP = 12.43 mag
 Object Magnitude          : V = 14.05 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 4.4 sec
 Object Mean Diameter      : 149 km  (src: astorb)
 Speed of the shadow       : 33.9 km/s
 Elongation to Moon & Sun  : 92° (sunlit = 10%), Sun = 56°
 Cross-track uncertainty   : 1.0 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.06 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#125

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

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