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2022-07-20 / 4UC 394-086568 / (69) Hesperia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Pierre Le Cam O+ CCD M250 FR GPS++ 23:44:10 23:45:23.7 23:45:32.1 23:46:50 0.7 0.7 8.40 113.4
2 show Sven Andersson O+ CCD M355 DE GPS++ 23:43:32 23:44:31.72 23:44:37.72 23:45:31 0.3 0.3 6.00 81.0
3 show A. Marciniak et al O+ CCD M350 PL GPS+ 23:42:15 23:44:20.70 23:44:30.60 23:46:50 0.25 0.25 9.90 133.7
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#146 : bd1b0e7e-da97-4343-81ee-5c40d7ff58a3 [db: observed]

Using prediction bd1b0e7e-da97-4343-81ee-5c40d7ff58a3 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:
Size = 145 x 119 km
a',b' = 72.4, 59.3 km
X0,Y0 = 1094.0, 21.8 km
Mean diameter = 131 km

From 3 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: 2022-07-20, 23:45 UT (JD = 2459781.490)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 319None5.655 250°, 17° 2.44338e616401.50.0° None2013-07-24 109.0 +/- 11.0 km 2011-04-21
# 320None5.655 71°, -2° 2.44338e616401.50.0° None2013-07-24 109.0 +/- 11.0 km 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] : bd1b0e7e-da97-4343-81ee-5c40d7ff58a3 [observed]

 Occultation Date + Time   : 2022-07-20 at 23:48:19 UT +/- 0.01 min  [1]
 Object Designation        : (69) Hesperia
 Orbit Class               : MBA
 Star Designation          : GDR3 4106641711815880192
 Star Coordinates (ICRF)   : RA = 18 40 57.1740, DE = -11 19 16.686  [2]
 Star Magnitudes           : G = 13.65 mag, RP = 12.42 mag, BP = 15.35 mag
 Object Magnitude          : V = 12.38 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 10.2 sec
 Object Mean Diameter      : 138 km  (src: astorb)
 Speed of the shadow       : 13.5 km/s
 Elongation to Moon & Sun  : 112° (sunlit = 46%), Sun = 159°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.95 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#146

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

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